Creating the libcxx release 3.3 branch.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/branches/release_33@181278 91177308-0d34-0410-b5e6-96231b3b80d8
2013-05-07 00:25:14 +00:00
1348 changed files with 6650 additions and 58231 deletions
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,9 +14,9 @@ set(PACKAGE_BUGREPORT "llvmbugs@cs.uiuc.edu")

 # Add path for custom modules
 set(CMAKE_MODULE_PATH
+  ${CMAKE_MODULE_PATH}
  "${CMAKE_CURRENT_SOURCE_DIR}/cmake"
  "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules"
-  ${CMAKE_MODULE_PATH}
  )

 # Require out of source build.
@@ -26,10 +26,6 @@ MACRO_ENSURE_OUT_OF_SOURCE_BUILD(
 build directory and run 'cmake /path/to/${PROJECT_NAME} [options]' there."
 )

-if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
-  set(LIBCXX_BUILT_STANDALONE 1)
-endif()
-
 #===============================================================================
 # Setup CMake Options
 #===============================================================================
@@ -42,15 +38,14 @@ option(LIBCXX_ENABLE_PEDANTIC "Compile with pedantic enabled." ON)
 option(LIBCXX_ENABLE_WERROR "Fail and stop if a warning is triggered." OFF)
 option(LIBCXX_ENABLE_CXX0X "Enable -std=c++0x and use of c++0x language features if the compiler supports it." ON)
 option(LIBCXX_ENABLE_SHARED "Build libc++ as a shared library." ON)
-option(LIBCXX_INSTALL_SUPPORT_HEADERS "Install libc++ support headers." ON)

-set(CXXABIS none libcxxabi libcxxrt libstdc++ libsupc++)
+set(CXXABIS none libcxxabi libcxxrt libsupc++)
 if (NOT DEFINED LIBCXX_CXX_ABI)
  set(LIBCXX_CXX_ABI "none")
 endif()
 set(LIBCXX_CXX_ABI "${LIBCXX_CXX_ABI}" CACHE STRING
    "Specify C++ ABI library to use." FORCE)
-set_property(CACHE LIBCXX_CXX_ABI PROPERTY STRINGS ;${CXXABIS})
+set_property(CACHE LIBCXX_CXX_ABI PROPERTY STRINGS "";${CXXABIS})

 #===============================================================================
 # Configure System
@@ -133,26 +128,17 @@ macro(setup_abi_lib abipathvar abidefines abilibs abifiles abidirs)
    )
 endmacro()

-if ("${LIBCXX_CXX_ABI}" STREQUAL "libstdc++" OR
-    "${LIBCXX_CXX_ABI}" STREQUAL "libsupc++")
+if ("${LIBCXX_CXX_ABI}" STREQUAL "libsupc++")
  set(_LIBSUPCXX_INCLUDE_FILES
    cxxabi.h bits/c++config.h bits/os_defines.h bits/cpu_defines.h
    bits/cxxabi_tweaks.h bits/cxxabi_forced.h
    )
-  if ("${LIBCXX_CXX_ABI}" STREQUAL "libstdc++")
-    set(_LIBSUPCXX_DEFINES "-DLIBSTDCXX")
-    set(_LIBSUPCXX_LIBNAME stdc++)
-  else()
-    set(_LIBSUPCXX_DEFINES "")
-    set(_LIBSUPCXX_LIBNAME supc++)
-  endif()
-  setup_abi_lib("LIBCXX_LIBSUPCXX_INCLUDE_PATHS"
-    "-D__GLIBCXX__ ${_LIBSUPCXX_DEFINES}"
-    "${_LIBSUPCXX_LIBNAME}" "${_LIBSUPCXX_INCLUDE_FILES}" "bits"
+  setup_abi_lib("LIBCXX_LIBSUPCXX_INCLUDE_PATHS" "-D__GLIBCXX__"
+    "supc++" "${_LIBSUPCXX_INCLUDE_FILES}" "bits"
    )
 elseif ("${LIBCXX_CXX_ABI}" STREQUAL "libcxxabi")
  setup_abi_lib("LIBCXX_LIBCXXABI_INCLUDE_PATHS" ""
-    "c++abi" "cxxabi.h" ""
+    "c++abi" "cxxabi.h;cxa_demangle.h" ""
    )
 elseif ("${LIBCXX_CXX_ABI}" STREQUAL "libcxxrt")
  setup_abi_lib("LIBCXX_LIBCXXRT_INCLUDE_PATHS" "-DLIBCXXRT"
@@ -160,7 +146,7 @@ elseif ("${LIBCXX_CXX_ABI}" STREQUAL "libcxxrt")
    )
 elseif (NOT "${LIBCXX_CXX_ABI}" STREQUAL "none")
  message(FATAL_ERROR
-    "Currently libstdc++, libsupc++, libcxxabi, libcxxrt and none are "
+    "Currently libsupc++, libcxxabi, libcxxrt and none are "
    "supported for c++ abi."
    )
 endif ()
@@ -194,11 +180,7 @@ macro(append_if list condition var)
 endmacro()

 # Get warning flags
-if (NOT MSVC)
-  append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_WALL_FLAG -Wall)
-  set(LIBCXX_CXX_REQUIRED_FLAGS, -Werror=return-type)
-endif()
-
+append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_WALL_FLAG -Wall)
 append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_W_FLAG -W)
 append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_WNO_UNUSED_PARAMETER_FLAG -Wno-unused-parameter)
 append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_WWRITE_STRINGS_FLAG -Wwrite-strings)
@@ -206,9 +188,6 @@ append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_WNO_LONG_LONG_FLAG -Wno-long-long)
 if (LIBCXX_ENABLE_WERROR)
  append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_WERROR_FLAG -Werror)
  append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_WX_FLAG -WX)
-else()
-  append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_WNO_ERROR_FLAG -Wno-error)
-  append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_NO_WX_FLAG -WX-)
 endif()
 if (LIBCXX_ENABLE_PEDANTIC)
  append_if(LIBCXX_CXX_WARNING_FLAGS LIBCXX_HAS_PEDANTIC_FLAG -pedantic)
@@ -255,10 +234,6 @@ if (NOT LIBCXX_ENABLE_SHARED)
 endif()

 # This is the _ONLY_ place where add_definitions is called.
-if (MSVC)
-  add_definitions(-D_CRT_SECURE_NO_WARNINGS)
-endif()
-
 add_definitions(
 ${LIBCXX_CXX_REQUIRED_FLAGS}
 ${LIBCXX_CXX_WARNING_FLAGS}
@@ -270,7 +245,6 @@ add_definitions(
 #===============================================================================

 include_directories(include)
-add_subdirectory(include)

 # Add source code. This also contains all of the logic for deciding linker flags
 # soname, etc...
--- a/CREDITS.TXT
+++ b/CREDITS.TXT
@@ -31,14 +31,6 @@ D: FreeBSD and Solaris ports, libcxxrt support, some atomics work.
 N: Marshall Clow
 E: mclow.lists@gmail.com
 E: marshall@idio.com
-D: C++14 support, patches and bug fixes.
-
-N: Bill Fisher
-E: william.w.fisher@gmail.com
-D: Regex bug fixes.
-
-N: Matthew Dempsky
-E: matthew@dempsky.org
 D: Minor patches and bug fixes.

 N: Google Inc.
@@ -76,10 +68,6 @@ N: Bjorn Reese
 E: breese@users.sourceforge.net
 D: Initial regex prototype

-N: Nico Rieck
-E: nico.rieck@gmail.com
-D: Windows fixes
-
 N: Jonathan Sauer
 D: Minor patches, mostly related to constexpr

@@ -109,14 +97,6 @@ N: Zhang Xiongpang
 E: zhangxiongpang@gmail.com
 D: Minor patches and bug fixes.

-N: Xing Xue
-E: xingxue@ca.ibm.com
-D: AIX port
-
-N: Zhihao Yuan
-E: lichray@gmail.com
-D: Standard compatibility fixes.
-
 N: Jeffrey Yasskin
 E: jyasskin@gmail.com
 E: jyasskin@google.com
--- a/2
+++ b/2
@@ -39,8 +39,6 @@ installheaders::
 	chmod 644 $(HEADER_DIR)/c++/v1/*
 	chmod 755 $(HEADER_DIR)/c++/v1/ext
 	chmod 644 $(HEADER_DIR)/c++/v1/ext/*
-	chmod 755 $(HEADER_DIR)/c++/v1/experimental
-	chmod 644 $(HEADER_DIR)/c++/v1/experimental/*

 install::

--- a/cmake/config-ix.cmake
+++ b/cmake/config-ix.cmake
@@ -13,11 +13,9 @@ check_cxx_compiler_flag(-Wwrite-strings       LIBCXX_HAS_WWRITE_STRINGS_FLAG)
 check_cxx_compiler_flag(-Wno-long-long        LIBCXX_HAS_WNO_LONG_LONG_FLAG)
 check_cxx_compiler_flag(-pedantic             LIBCXX_HAS_PEDANTIC_FLAG)
 check_cxx_compiler_flag(-Werror               LIBCXX_HAS_WERROR_FLAG)
-check_cxx_compiler_flag(-Wno-error            LIBCXX_HAS_WNO_ERROR_FLAG)
 check_cxx_compiler_flag(-fno-exceptions       LIBCXX_HAS_FNO_EXCEPTIONS_FLAG)
 check_cxx_compiler_flag(-fno-rtti             LIBCXX_HAS_FNO_RTTI_FLAG)
 check_cxx_compiler_flag(/WX                   LIBCXX_HAS_WX_FLAG)
-check_cxx_compiler_flag(/WX-                  LIBCXX_HAS_NO_WX_FLAG)
 check_cxx_compiler_flag(/EHsc                 LIBCXX_HAS_EHSC_FLAG)
 check_cxx_compiler_flag(/EHs-                 LIBCXX_HAS_NO_EHS_FLAG)
 check_cxx_compiler_flag(/EHa-                 LIBCXX_HAS_NO_EHA_FLAG)
--- a/include/CMakeLists.txt
+++ b/include/CMakeLists.txt
@@ -1,16 +0,0 @@
-if (NOT LIBCXX_INSTALL_SUPPORT_HEADERS)
-  set(LIBCXX_SUPPORT_HEADER_PATTERN PATTERN "support" EXCLUDE)
-endif()
-
-file(COPY .
-  DESTINATION "${CMAKE_BINARY_DIR}/include/c++/v1"
-  FILES_MATCHING
-  PATTERN "*"
-  PATTERN "CMakeLists.txt" EXCLUDE
-  PATTERN ".svn" EXCLUDE
-  ${LIBCXX_SUPPORT_HEADER_PATTERN}
-  )
-
-install(DIRECTORY "${CMAKE_BINARY_DIR}/include/c++/v1/"
-  DESTINATION include/c++/v1/
-  )
--- a/include/__bit_reference
+++ b/include/__bit_reference
@@ -40,7 +40,7 @@ class __bit_reference
    __storage_pointer __seg_;
    __storage_type    __mask_;

-#if defined(__clang__) || defined(__IBMCPP__) || defined(_LIBCPP_MSVC)
+#if defined(__clang__)
    friend typename _Cp::__self;
 #else
    friend class _Cp::__self;
@@ -82,7 +82,7 @@ class __bit_reference<_Cp, false>
 };

 template <class _Cp>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
 swap(__bit_reference<_Cp> __x, __bit_reference<_Cp> __y) _NOEXCEPT
 {
@@ -92,7 +92,7 @@ swap(__bit_reference<_Cp> __x, __bit_reference<_Cp> __y) _NOEXCEPT
 }

 template <class _Cp, class _Dp>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
 swap(__bit_reference<_Cp> __x, __bit_reference<_Dp> __y) _NOEXCEPT
 {
@@ -102,7 +102,7 @@ swap(__bit_reference<_Cp> __x, __bit_reference<_Dp> __y) _NOEXCEPT
 }

 template <class _Cp>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
 swap(__bit_reference<_Cp> __x, bool& __y) _NOEXCEPT
 {
@@ -112,7 +112,7 @@ swap(__bit_reference<_Cp> __x, bool& __y) _NOEXCEPT
 }

 template <class _Cp>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
 swap(bool& __x, __bit_reference<_Cp> __y) _NOEXCEPT
 {
@@ -130,7 +130,7 @@ class __bit_const_reference
    __storage_pointer        __seg_;
    __storage_type __mask_;

-#if defined(__clang__) || defined(__IBMCPP__) || defined(_LIBCPP_MSVC)
+#if defined(__clang__)
    friend typename _Cp::__self;
 #else
    friend class _Cp::__self;
@@ -173,8 +173,6 @@ __find_bool_true(__bit_iterator<_Cp, _IsConst> __first, typename _Cp::size_type
        __storage_type __b = *__first.__seg_ & __m;
        if (__b)
            return _It(__first.__seg_, static_cast<unsigned>(_VSTD::__ctz(__b)));
-        if (__n == __dn)
-            return _It(__first.__seg_, __first.__ctz_ + __n);
        __n -= __dn;
        ++__first.__seg_;
    }
@@ -209,8 +207,6 @@ __find_bool_false(__bit_iterator<_Cp, _IsConst> __first, typename _Cp::size_type
        __storage_type __b = ~*__first.__seg_ & __m;
        if (__b)
            return _It(__first.__seg_, static_cast<unsigned>(_VSTD::__ctz(__b)));
-        if (__n == __dn)
-            return _It(__first.__seg_, __first.__ctz_ + __n);
        __n -= __dn;
        ++__first.__seg_;
    }
@@ -337,7 +333,7 @@ __fill_n_false(__bit_iterator<_Cp, false> __first, typename _Cp::size_type __n)
    }
    // do middle whole words
    __storage_type __nw = __n / __bits_per_word;
-    _VSTD::memset(_VSTD::__to_raw_pointer(__first.__seg_), 0, __nw * sizeof(__storage_type));
+    _VSTD::memset(__first.__seg_, 0, __nw * sizeof(__storage_type));
    __n -= __nw * __bits_per_word;
    // do last partial word
    if (__n > 0)
@@ -367,7 +363,7 @@ __fill_n_true(__bit_iterator<_Cp, false> __first, typename _Cp::size_type __n)
    }
    // do middle whole words
    __storage_type __nw = __n / __bits_per_word;
-    _VSTD::memset(_VSTD::__to_raw_pointer(__first.__seg_), -1, __nw * sizeof(__storage_type));
+    _VSTD::memset(__first.__seg_, -1, __nw * sizeof(__storage_type));
    __n -= __nw * __bits_per_word;
    // do last partial word
    if (__n > 0)
@@ -379,7 +375,7 @@ __fill_n_true(__bit_iterator<_Cp, false> __first, typename _Cp::size_type __n)
 }

 template <class _Cp>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
 fill_n(__bit_iterator<_Cp, false> __first, typename _Cp::size_type __n, bool __value_)
 {
@@ -434,9 +430,7 @@ __copy_aligned(__bit_iterator<_Cp, _IsConst> __first, __bit_iterator<_Cp, _IsCon
        // __first.__ctz_ == 0;
        // do middle words
        __storage_type __nw = __n / __bits_per_word;
-        _VSTD::memmove(_VSTD::__to_raw_pointer(__result.__seg_),
-                       _VSTD::__to_raw_pointer(__first.__seg_),
-                       __nw * sizeof(__storage_type));
+        _VSTD::memmove(__result.__seg_, __first.__seg_, __nw * sizeof(__storage_type));
        __n -= __nw * __bits_per_word;
        __result.__seg_ += __nw;
        // do last word
@@ -575,9 +569,7 @@ __copy_backward_aligned(__bit_iterator<_Cp, _IsConst> __first, __bit_iterator<_C
        __storage_type __nw = __n / __bits_per_word;
        __result.__seg_ -= __nw;
        __last.__seg_ -= __nw;
-        _VSTD::memmove(_VSTD::__to_raw_pointer(__result.__seg_),
-                       _VSTD::__to_raw_pointer(__last.__seg_),
-                       __nw * sizeof(__storage_type));
+        _VSTD::memmove(__result.__seg_, __last.__seg_, __nw * sizeof(__storage_type));
        __n -= __nw * __bits_per_word;
        // do last word
        if (__n > 0)
@@ -878,7 +870,6 @@ struct __bit_array
 {
    typedef typename _Cp::difference_type difference_type;
    typedef typename _Cp::__storage_type  __storage_type;
-    typedef typename _Cp::__storage_pointer __storage_pointer;
    typedef typename _Cp::iterator        iterator;
    static const unsigned __bits_per_word = _Cp::__bits_per_word;
    static const unsigned _Np = 4;
@@ -889,15 +880,9 @@ struct __bit_array
    _LIBCPP_INLINE_VISIBILITY static difference_type capacity()
        {return static_cast<difference_type>(_Np * __bits_per_word);}
    _LIBCPP_INLINE_VISIBILITY explicit __bit_array(difference_type __s) : __size_(__s) {}
-    _LIBCPP_INLINE_VISIBILITY iterator begin()
-    {
-        return iterator(pointer_traits<__storage_pointer>::pointer_to(__word_[0]), 0);
-    }
-    _LIBCPP_INLINE_VISIBILITY iterator end()
-    {
-        return iterator(pointer_traits<__storage_pointer>::pointer_to(__word_[0]) + __size_ / __bits_per_word,
-                                                  static_cast<unsigned>(__size_ % __bits_per_word));
-    }
+    _LIBCPP_INLINE_VISIBILITY iterator begin() {return iterator(__word_, 0);}
+    _LIBCPP_INLINE_VISIBILITY iterator end()   {return iterator(__word_ + __size_ / __bits_per_word,
+                                                  static_cast<unsigned>(__size_ % __bits_per_word));}
 };

 template <class _Cp>
@@ -1108,11 +1093,7 @@ private:
    unsigned          __ctz_;

 public:
-    _LIBCPP_INLINE_VISIBILITY __bit_iterator() _NOEXCEPT
-#if _LIBCPP_STD_VER > 11
-    : __seg_(nullptr), __ctz_(0)
-#endif
-    {}
+    _LIBCPP_INLINE_VISIBILITY __bit_iterator() _NOEXCEPT {}

    _LIBCPP_INLINE_VISIBILITY
    __bit_iterator(const __bit_iterator<_Cp, false>& __it) _NOEXCEPT
@@ -1222,7 +1203,7 @@ private:
    __bit_iterator(__storage_pointer __s, unsigned __ctz) _NOEXCEPT
        : __seg_(__s), __ctz_(__ctz) {}

-#if defined(__clang__) || defined(__IBMCPP__) || defined(_LIBCPP_MSVC)
+#if defined(__clang__)
    friend typename _Cp::__self;
 #else
    friend class _Cp::__self;
--- a/include/__config
+++ b/include/__config
@@ -11,7 +11,7 @@
 #ifndef _LIBCPP_CONFIG
 #define _LIBCPP_CONFIG

-#if !defined(_MSC_VER) || defined(__clang__)
+#ifndef _MSC_VER // explicit macro necessary because it is only defined below in this file
 #pragma GCC system_header
 #endif

@@ -56,42 +56,19 @@
 # endif  // __LONG_LONG_SUPPORTED
 #endif  // __FreeBSD__

-#ifdef __NetBSD__
-# include <sys/endian.h>
-#  if _BYTE_ORDER == _LITTLE_ENDIAN
-#   define _LIBCPP_LITTLE_ENDIAN 1
-#   define _LIBCPP_BIG_ENDIAN    0
-# else  // _BYTE_ORDER == _LITTLE_ENDIAN
-#   define _LIBCPP_LITTLE_ENDIAN 0
-#   define _LIBCPP_BIG_ENDIAN    1
-# endif  // _BYTE_ORDER == _LITTLE_ENDIAN
-# define _LIBCPP_HAS_QUICK_EXIT
-#endif  // __NetBSD__
-
 #ifdef _WIN32
 #  define _LIBCPP_LITTLE_ENDIAN 1
 #  define _LIBCPP_BIG_ENDIAN    0
 // Compiler intrinsics (GCC or MSVC)
-#  if defined(__clang__) \
-   || (defined(_MSC_VER) && _MSC_VER >= 1400) \
+#  if (defined(_MSC_VER) && _MSC_VER >= 1400) \
   || (defined(__GNUC__) && _GNUC_VER > 403)
-#    define _LIBCPP_HAS_IS_BASE_OF
-#  endif
-#  if defined(_MSC_VER) && !defined(__clang__)
-#    define _LIBCPP_MSVC // Using Microsoft Visual C++ compiler
-#    define _LIBCPP_TOSTRING2(x) #x
-#    define _LIBCPP_TOSTRING(x) _LIBCPP_TOSTRING2(x)
-#    define _LIBCPP_WARNING(x) __pragma(message(__FILE__ "(" _LIBCPP_TOSTRING(__LINE__) ") : warning note: " x))
-#  endif
-#  // If mingw not explicitly detected, assume using MS C runtime only.
-#  ifndef __MINGW32__
-#    define _LIBCPP_MSVCRT // Using Microsoft's C Runtime library
+#    define _LIBCP_HAS_IS_BASE_OF
 #  endif
 #endif  // _WIN32

 #ifdef __linux__
 #  if defined(__GNUC__) && _GNUC_VER >= 403
-#    define _LIBCPP_HAS_IS_BASE_OF
+#    define _LIBCP_HAS_IS_BASE_OF
 #  endif
 #endif

@@ -138,11 +115,8 @@
 # define _LIBCPP_TYPE_VIS
 #endif

-#define _LIBCPP_TYPE_VIS_ONLY
-#define _LIBCPP_FUNC_VIS_ONLY
-
 #ifndef _LIBCPP_INLINE_VISIBILITY
-# ifdef _LIBCPP_MSVC
+# ifdef _MSC_VER
 #  define _LIBCPP_INLINE_VISIBILITY __forceinline
 # else // MinGW GCC and Clang
 #  define _LIBCPP_INLINE_VISIBILITY __attribute__ ((__always_inline__))
@@ -154,7 +128,7 @@
 #endif

 #ifndef _LIBCPP_ALWAYS_INLINE
-# ifdef _LIBCPP_MSVC
+# ifdef _MSC_VER
 #  define _LIBCPP_ALWAYS_INLINE __forceinline
 # endif
 #endif
@@ -174,21 +148,13 @@
 #endif

 #ifndef _LIBCPP_TYPE_VIS
-#  if __has_attribute(__type_visibility__)
+#  if __has_attribute(type_visibility)
 #    define _LIBCPP_TYPE_VIS __attribute__ ((__type_visibility__("default")))
 #  else
 #    define _LIBCPP_TYPE_VIS __attribute__ ((__visibility__("default")))
 #  endif
 #endif

-#ifndef _LIBCPP_TYPE_VIS_ONLY
-# define _LIBCPP_TYPE_VIS_ONLY _LIBCPP_TYPE_VIS
-#endif
-
-#ifndef _LIBCPP_FUNC_VIS_ONLY
-# define _LIBCPP_FUNC_VIS_ONLY _LIBCPP_FUNC_VIS
-#endif
-
 #ifndef _LIBCPP_INLINE_VISIBILITY
 #define _LIBCPP_INLINE_VISIBILITY __attribute__ ((__visibility__("hidden"), __always_inline__))
 #endif
@@ -197,6 +163,10 @@
 #define _LIBCPP_EXCEPTION_ABI _LIBCPP_TYPE_VIS
 #endif

+#ifndef _LIBCPP_CANTTHROW
+#define _LIBCPP_CANTTHROW __attribute__ ((__nothrow__))
+#endif
+
 #ifndef _LIBCPP_ALWAYS_INLINE
 #define _LIBCPP_ALWAYS_INLINE  __attribute__ ((__visibility__("hidden"), __always_inline__))
 #endif
@@ -291,7 +261,7 @@ typedef __char32_t char32_t;
 #endif

 #if __has_feature(is_base_of)
-#  define _LIBCPP_HAS_IS_BASE_OF
+#  define _LIBCP_HAS_IS_BASE_OF
 #endif

 // Objective-C++ features (opt-in)
@@ -308,19 +278,9 @@ typedef __char32_t char32_t;
 #define _LIBCPP_HAS_NO_CONSTEXPR
 #endif

-#if __ISO_C_VISIBLE >= 2011 || __cplusplus >= 201103L
-#if defined(__FreeBSD__)
+#if defined(__FreeBSD__) && (__ISO_C_VISIBLE >= 2011 || __cplusplus >= 201103L)
 #define _LIBCPP_HAS_QUICK_EXIT
 #define _LIBCPP_HAS_C11_FEATURES
-#elif defined(__linux__)
-#include <features.h>
-#if __GLIBC_PREREQ(2, 15)
-#define _LIBCPP_HAS_QUICK_EXIT
-#endif
-#if __GLIBC_PREREQ(2, 17)
-#define _LIBCPP_HAS_C11_FEATURES
-#endif
-#endif
 #endif

 #if (__has_feature(cxx_noexcept))
@@ -414,14 +374,13 @@ namespace _LIBCPP_NAMESPACE {
 using namespace _LIBCPP_NAMESPACE __attribute__((__strong__));
 }

-#elif defined(_LIBCPP_MSVC)
+#elif defined(_MSC_VER)

 #define _LIBCPP_HAS_NO_TEMPLATE_ALIASES
 #define _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
 #define _LIBCPP_HAS_NO_CONSTEXPR
 #define _LIBCPP_HAS_NO_UNICODE_CHARS
 #define _LIBCPP_HAS_NO_DELETED_FUNCTIONS
-#define _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
 #define __alignof__ __alignof
 #define _LIBCPP_NORETURN __declspec(noreturn)
 #define _ALIGNAS(x) __declspec(align(x))
@@ -434,43 +393,10 @@ using namespace _LIBCPP_NAMESPACE __attribute__((__strong__));
 #define _LIBCPP_END_NAMESPACE_STD  }
 #define _VSTD std

-#  define _LIBCPP_WEAK
 namespace std {
 }

-#elif defined(__IBMCPP__)
-
-#define _ALIGNAS(x) __attribute__((__aligned__(x)))
-#define _ALIGNAS_TYPE(x) __attribute__((__aligned__(__alignof(x))))
-#define _ATTRIBUTE(x) __attribute__((x))
-#define _LIBCPP_NORETURN __attribute__((noreturn))
-
-#define _NOEXCEPT throw()
-#define _NOEXCEPT_(x)
-
-#define _LIBCPP_HAS_NO_TEMPLATE_ALIASES
-#define _LIBCPP_HAS_NO_ADVANCED_SFINAE
-#define _LIBCPP_HAS_NO_ALWAYS_INLINE_VARIADICS
-#define _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
-#define _LIBCPP_HAS_NO_NULLPTR
-#define _LIBCPP_HAS_NO_UNICODE_CHARS
-#define _LIBCPP_HAS_NO_STRONG_ENUMS
-#define _LIBCPP_HAS_IS_BASE_OF
-
-#if defined(_AIX)
-#define __MULTILOCALE_API
-#endif
-
-#define _LIBCPP_BEGIN_NAMESPACE_STD namespace std {inline namespace _LIBCPP_NAMESPACE {
-#define _LIBCPP_END_NAMESPACE_STD  } }
-#define _VSTD std::_LIBCPP_NAMESPACE
-
-namespace std {
-  inline namespace _LIBCPP_NAMESPACE {
-  }
-}
-
-#endif // __clang__ || __GNUC___ || _MSC_VER || __IBMCPP__
+#endif // __clang__ || __GNUC___ || _MSC_VER

 #ifdef _LIBCPP_HAS_NO_UNICODE_CHARS
 typedef unsigned short char16_t;
@@ -533,26 +459,11 @@ template <unsigned> struct __static_assert_check {};
 #define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x)
 #endif  // _LIBCPP_HAS_NO_STRONG_ENUMS

-#ifdef _LIBCPP_DEBUG
-#   if _LIBCPP_DEBUG == 0
-#       define _LIBCPP_DEBUG_LEVEL 1
-#   elif _LIBCPP_DEBUG == 1
-#       define _LIBCPP_DEBUG_LEVEL 2
-#   else
-#       error Supported values for _LIBCPP_DEBUG are 0 and 1
-#   endif
-#   define _LIBCPP_EXTERN_TEMPLATE(...)
-#endif
-
 #ifndef _LIBCPP_EXTERN_TEMPLATE
-#define _LIBCPP_EXTERN_TEMPLATE(...)
+#define _LIBCPP_EXTERN_TEMPLATE(...) extern template __VA_ARGS__;
 #endif

-#ifndef _LIBCPP_EXTERN_TEMPLATE2
-#define _LIBCPP_EXTERN_TEMPLATE2(...) extern template __VA_ARGS__;
-#endif
-
-#if defined(__APPLE__) || defined(__FreeBSD__) || defined(_WIN32) || defined(__sun__) || defined(__NetBSD__)
+#if defined(__APPLE__) || defined(__FreeBSD__) || defined(_WIN32) || defined(__sun__)
 #define _LIBCPP_LOCALE__L_EXTENSIONS 1
 #endif
 #ifdef __FreeBSD__
@@ -567,54 +478,20 @@ template <unsigned> struct __static_assert_check {};
 #define _LIBCPP_WCTYPE_IS_MASK
 #endif

-#if defined(__APPLE__)
-#ifndef _LIBCPP_TRIVIAL_PAIR_COPY_CTOR
-#  define _LIBCPP_TRIVIAL_PAIR_COPY_CTOR 0
-#endif
+#ifdef _LIBCPP_DEBUG2
+#   if _LIBCPP_DEBUG2 == 0
+#       define _LIBCPP_DEBUG_LEVEL 1
+#   elif _LIBCPP_DEBUG2 == 1
+#       define _LIBCPP_DEBUG_LEVEL 2
+#   else
+#       error Supported values for _LIBCPP_DEBUG2 are 0 and 1
+#   endif
 #endif

-#ifndef _LIBCPP_TRIVIAL_PAIR_COPY_CTOR
-#  define _LIBCPP_TRIVIAL_PAIR_COPY_CTOR 1
-#endif
-
-#ifndef _LIBCPP_STD_VER
-#  if  __cplusplus <= 201103L
-#    define _LIBCPP_STD_VER 11
-#  else
-#    define _LIBCPP_STD_VER 13  // current year, or date of c++14 ratification
-#  endif
-#endif  // _LIBCPP_STD_VER
-
-#if _LIBCPP_STD_VER > 11
-#define _LIBCPP_DEPRECATED [[deprecated]]
+#ifdef _LIBCPP_DEBUG2
+#   include <__debug>
 #else
-#define _LIBCPP_DEPRECATED
-#endif
-
-#if _LIBCPP_STD_VER <= 11
-#define _LIBCPP_CONSTEXPR_AFTER_CXX11
-#define _LIBCPP_EXPLICIT_AFTER_CXX11
-#define _LIBCPP_DEPRECATED_AFTER_CXX11
-#else
-#define _LIBCPP_CONSTEXPR_AFTER_CXX11 constexpr
-#define _LIBCPP_EXPLICIT_AFTER_CXX11 explicit
-#define _LIBCPP_DEPRECATED_AFTER_CXX11 [[deprecated]]
-#endif
-
-// Try to find out if RTTI is disabled.
-// g++ and cl.exe have RTTI on by default and define a macro when it is.
-// g++ only defines the macro in 4.3.2 and onwards.
-#if !defined(_LIBCPP_NO_RTTI)
-#  if defined(__GNUG__) && (__GNUC__ >= 4 && \
-   (__GNUC_MINOR__ >= 3 || __GNUC_PATCHLEVEL__ >= 2)) && !defined(__GXX_RTTI)
-#    define _LIBCPP_NO_RTTI
-#  elif (defined(_MSC_VER) && !defined(__clang__)) && !defined(_CPPRTTI)
-#    define _LIBCPP_NO_RTTI
-#  endif
-#endif
-
-#ifndef _LIBCPP_WEAK
-#  define _LIBCPP_WEAK __attribute__((__weak__))
+#   define _LIBCPP_ASSERT(x, m) ((void)0)
 #endif

 #endif  // _LIBCPP_CONFIG
--- a/include/__debug
+++ b/include/__debug
@@ -11,10 +11,6 @@
 #ifndef _LIBCPP_DEBUG_H
 #define _LIBCPP_DEBUG_H

-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-#pragma GCC system_header
-#endif
-
 #if _LIBCPP_DEBUG_LEVEL >= 1

 #   include <cstdlib>
@@ -38,15 +34,8 @@ struct _LIBCPP_TYPE_VIS __i_node
    __i_node* __next_;
    __c_node* __c_;

-#ifndef _LIBCPP_HAS_NO_DELETED_FUNCTIONS
    __i_node(const __i_node&) = delete;
    __i_node& operator=(const __i_node&) = delete;
-#else
-private:
-    __i_node(const __i_node&);
-    __i_node& operator=(const __i_node&);
-public:
-#endif
    _LIBCPP_INLINE_VISIBILITY
    __i_node(void* __i, __i_node* __next, __c_node* __c)
        : __i_(__i), __next_(__next), __c_(__c) {}
@@ -61,15 +50,8 @@ struct _LIBCPP_TYPE_VIS __c_node
    __i_node** end_;
    __i_node** cap_;

-#ifndef _LIBCPP_HAS_NO_DELETED_FUNCTIONS
    __c_node(const __c_node&) = delete;
    __c_node& operator=(const __c_node&) = delete;
-#else
-private:
-    __c_node(const __c_node&);
-    __c_node& operator=(const __c_node&);
-public:
-#endif
    _LIBCPP_INLINE_VISIBILITY
    __c_node(void* __c, __c_node* __next)
        : __c_(__c), __next_(__next), beg_(nullptr), end_(nullptr), cap_(nullptr) {}
@@ -148,15 +130,8 @@ class _LIBCPP_TYPE_VIS __libcpp_db

    __libcpp_db();
 public:
-#ifndef _LIBCPP_HAS_NO_DELETED_FUNCTIONS
    __libcpp_db(const __libcpp_db&) = delete;
    __libcpp_db& operator=(const __libcpp_db&) = delete;
-#else
-private:
-    __libcpp_db(const __libcpp_db&);
-    __libcpp_db& operator=(const __libcpp_db&);
-public:
-#endif
    ~__libcpp_db();

    class __db_c_iterator;
@@ -196,7 +171,7 @@ public:
    bool __decrementable(const void* __i) const;
    bool __addable(const void* __i, ptrdiff_t __n) const;
    bool __subscriptable(const void* __i, ptrdiff_t __n) const;
-    bool __less_than_comparable(const void* __i, const void* __j) const;
+    bool __comparable(const void* __i, const void* __j) const;
 private:
    _LIBCPP_HIDDEN
    __i_node* __insert_iterator(void* __i);
--- a/include/__functional_03
+++ b/include/__functional_03
@@ -102,98 +102,98 @@ mem_fn(_Rp (_Tp::* __pm)(_A0, _A1, _A2))

 template<class _Rp, class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY
-__mem_fn<_Rp (_Tp::*)() const>
+__mem_fn<_Rp (_Tp::*)()>
 mem_fn(_Rp (_Tp::* __pm)() const)
 {
-    return __mem_fn<_Rp (_Tp::*)() const>(__pm);
+    return __mem_fn<_Rp (_Tp::*)()>(__pm);
 }

 template<class _Rp, class _Tp, class _A0>
 inline _LIBCPP_INLINE_VISIBILITY
-__mem_fn<_Rp (_Tp::*)(_A0) const>
+__mem_fn<_Rp (_Tp::*)(_A0)>
 mem_fn(_Rp (_Tp::* __pm)(_A0) const)
 {
-    return __mem_fn<_Rp (_Tp::*)(_A0) const>(__pm);
+    return __mem_fn<_Rp (_Tp::*)(_A0)>(__pm);
 }

 template<class _Rp, class _Tp, class _A0, class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
-__mem_fn<_Rp (_Tp::*)(_A0, _A1) const>
+__mem_fn<_Rp (_Tp::*)(_A0, _A1)>
 mem_fn(_Rp (_Tp::* __pm)(_A0, _A1) const)
 {
-    return __mem_fn<_Rp (_Tp::*)(_A0, _A1) const>(__pm);
+    return __mem_fn<_Rp (_Tp::*)(_A0, _A1)>(__pm);
 }

 template<class _Rp, class _Tp, class _A0, class _A1, class _A2>
 inline _LIBCPP_INLINE_VISIBILITY
-__mem_fn<_Rp (_Tp::*)(_A0, _A1, _A2) const>
+__mem_fn<_Rp (_Tp::*)(_A0, _A1, _A2)>
 mem_fn(_Rp (_Tp::* __pm)(_A0, _A1, _A2) const)
 {
-    return __mem_fn<_Rp (_Tp::*)(_A0, _A1, _A2) const>(__pm);
+    return __mem_fn<_Rp (_Tp::*)(_A0, _A1, _A2)>(__pm);
 }

 template<class _Rp, class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY
-__mem_fn<_Rp (_Tp::*)() volatile>
+__mem_fn<_Rp (_Tp::*)()>
 mem_fn(_Rp (_Tp::* __pm)() volatile)
 {
-    return __mem_fn<_Rp (_Tp::*)() volatile>(__pm);
+    return __mem_fn<_Rp (_Tp::*)()>(__pm);
 }

 template<class _Rp, class _Tp, class _A0>
 inline _LIBCPP_INLINE_VISIBILITY
-__mem_fn<_Rp (_Tp::*)(_A0) volatile>
+__mem_fn<_Rp (_Tp::*)(_A0)>
 mem_fn(_Rp (_Tp::* __pm)(_A0) volatile)
 {
-    return __mem_fn<_Rp (_Tp::*)(_A0) volatile>(__pm);
+    return __mem_fn<_Rp (_Tp::*)(_A0)>(__pm);
 }

 template<class _Rp, class _Tp, class _A0, class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
-__mem_fn<_Rp (_Tp::*)(_A0, _A1) volatile>
+__mem_fn<_Rp (_Tp::*)(_A0, _A1)>
 mem_fn(_Rp (_Tp::* __pm)(_A0, _A1) volatile)
 {
-    return __mem_fn<_Rp (_Tp::*)(_A0, _A1) volatile>(__pm);
+    return __mem_fn<_Rp (_Tp::*)(_A0, _A1)>(__pm);
 }

 template<class _Rp, class _Tp, class _A0, class _A1, class _A2>
 inline _LIBCPP_INLINE_VISIBILITY
-__mem_fn<_Rp (_Tp::*)(_A0, _A1, _A2) volatile>
+__mem_fn<_Rp (_Tp::*)(_A0, _A1, _A2)>
 mem_fn(_Rp (_Tp::* __pm)(_A0, _A1, _A2) volatile)
 {
-    return __mem_fn<_Rp (_Tp::*)(_A0, _A1, _A2) volatile>(__pm);
+    return __mem_fn<_Rp (_Tp::*)(_A0, _A1, _A2)>(__pm);
 }

 template<class _Rp, class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY
-__mem_fn<_Rp (_Tp::*)() const volatile>
+__mem_fn<_Rp (_Tp::*)()>
 mem_fn(_Rp (_Tp::* __pm)() const volatile)
 {
-    return __mem_fn<_Rp (_Tp::*)() const volatile>(__pm);
+    return __mem_fn<_Rp (_Tp::*)()>(__pm);
 }

 template<class _Rp, class _Tp, class _A0>
 inline _LIBCPP_INLINE_VISIBILITY
-__mem_fn<_Rp (_Tp::*)(_A0) const volatile>
+__mem_fn<_Rp (_Tp::*)(_A0)>
 mem_fn(_Rp (_Tp::* __pm)(_A0) const volatile)
 {
-    return __mem_fn<_Rp (_Tp::*)(_A0) const volatile>(__pm);
+    return __mem_fn<_Rp (_Tp::*)(_A0)>(__pm);
 }

 template<class _Rp, class _Tp, class _A0, class _A1>
 inline _LIBCPP_INLINE_VISIBILITY
-__mem_fn<_Rp (_Tp::*)(_A0, _A1) const volatile>
+__mem_fn<_Rp (_Tp::*)(_A0, _A1)>
 mem_fn(_Rp (_Tp::* __pm)(_A0, _A1) const volatile)
 {
-    return __mem_fn<_Rp (_Tp::*)(_A0, _A1) const volatile>(__pm);
+    return __mem_fn<_Rp (_Tp::*)(_A0, _A1)>(__pm);
 }

 template<class _Rp, class _Tp, class _A0, class _A1, class _A2>
 inline _LIBCPP_INLINE_VISIBILITY
-__mem_fn<_Rp (_Tp::*)(_A0, _A1, _A2) const volatile>
+__mem_fn<_Rp (_Tp::*)(_A0, _A1, _A2)>
 mem_fn(_Rp (_Tp::* __pm)(_A0, _A1, _A2) const volatile)
 {
-    return __mem_fn<_Rp (_Tp::*)(_A0, _A1, _A2) const volatile>(__pm);
+    return __mem_fn<_Rp (_Tp::*)(_A0, _A1, _A2)>(__pm);
 }

 // bad_function_call
@@ -203,7 +203,7 @@ class _LIBCPP_EXCEPTION_ABI bad_function_call
 {
 };

-template<class _Fp> class _LIBCPP_TYPE_VIS_ONLY function; // undefined
+template<class _Fp> class _LIBCPP_TYPE_VIS function; // undefined

 namespace __function
 {
@@ -644,7 +644,7 @@ __func<_Fp, _Alloc, _Rp(_A0, _A1, _A2)>::target_type() const
 }  // __function

 template<class _Rp>
-class _LIBCPP_TYPE_VIS_ONLY function<_Rp()>
+class _LIBCPP_TYPE_VIS function<_Rp()>
 {
    typedef __function::__base<_Rp()> __base;
    aligned_storage<3*sizeof(void*)>::type __buf_;
@@ -928,7 +928,7 @@ function<_Rp()>::target() const
 #endif  // _LIBCPP_NO_RTTI

 template<class _Rp, class _A0>
-class _LIBCPP_TYPE_VIS_ONLY function<_Rp(_A0)>
+class _LIBCPP_TYPE_VIS function<_Rp(_A0)>
    : public unary_function<_A0, _Rp>
 {
    typedef __function::__base<_Rp(_A0)> __base;
@@ -1230,7 +1230,7 @@ function<_Rp(_A0)>::target() const
 #endif  // _LIBCPP_NO_RTTI

 template<class _Rp, class _A0, class _A1>
-class _LIBCPP_TYPE_VIS_ONLY function<_Rp(_A0, _A1)>
+class _LIBCPP_TYPE_VIS function<_Rp(_A0, _A1)>
    : public binary_function<_A0, _A1, _Rp>
 {
    typedef __function::__base<_Rp(_A0, _A1)> __base;
@@ -1532,7 +1532,7 @@ function<_Rp(_A0, _A1)>::target() const
 #endif  // _LIBCPP_NO_RTTI

 template<class _Rp, class _A0, class _A1, class _A2>
-class _LIBCPP_TYPE_VIS_ONLY function<_Rp(_A0, _A1, _A2)>
+class _LIBCPP_TYPE_VIS function<_Rp(_A0, _A1, _A2)>
 {
    typedef __function::__base<_Rp(_A0, _A1, _A2)> __base;
    aligned_storage<3*sizeof(void*)>::type __buf_;
@@ -1860,11 +1860,11 @@ swap(function<_Fp>& __x, function<_Fp>& __y)
 {return __x.swap(__y);}

 template<class _Tp> struct __is_bind_expression : public false_type {};
-template<class _Tp> struct _LIBCPP_TYPE_VIS_ONLY is_bind_expression
+template<class _Tp> struct _LIBCPP_TYPE_VIS is_bind_expression
    : public __is_bind_expression<typename remove_cv<_Tp>::type> {};

 template<class _Tp> struct __is_placeholder : public integral_constant<int, 0> {};
-template<class _Tp> struct _LIBCPP_TYPE_VIS_ONLY is_placeholder
+template<class _Tp> struct _LIBCPP_TYPE_VIS is_placeholder
    : public __is_placeholder<typename remove_cv<_Tp>::type> {};

 namespace placeholders
--- a/include/__functional_base
+++ b/include/__functional_base
@@ -15,7 +15,6 @@
 #include <type_traits>
 #include <typeinfo>
 #include <exception>
-#include <new>

 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
@@ -24,21 +23,21 @@
 _LIBCPP_BEGIN_NAMESPACE_STD

 template <class _Arg, class _Result>
-struct _LIBCPP_TYPE_VIS_ONLY unary_function
+struct _LIBCPP_TYPE_VIS unary_function
 {
    typedef _Arg    argument_type;
    typedef _Result result_type;
 };

 template <class _Arg1, class _Arg2, class _Result>
-struct _LIBCPP_TYPE_VIS_ONLY binary_function
+struct _LIBCPP_TYPE_VIS binary_function
 {
    typedef _Arg1   first_argument_type;
    typedef _Arg2   second_argument_type;
    typedef _Result result_type;
 };

-template <class _Tp> struct _LIBCPP_TYPE_VIS_ONLY hash;
+template <class _Tp> struct _LIBCPP_TYPE_VIS hash;

 template <class _Tp>
 struct __has_result_type
@@ -51,80 +50,13 @@ public:
    static const bool value = sizeof(__test<_Tp>(0)) == 1;
 };

-#if _LIBCPP_STD_VER > 11
-template <class _Tp = void>
-#else
 template <class _Tp>
-#endif
-struct _LIBCPP_TYPE_VIS_ONLY less : binary_function<_Tp, _Tp, bool>
+struct _LIBCPP_TYPE_VIS less : binary_function<_Tp, _Tp, bool>
 {
-    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 
-    bool operator()(const _Tp& __x, const _Tp& __y) const
+    _LIBCPP_INLINE_VISIBILITY bool operator()(const _Tp& __x, const _Tp& __y) const
        {return __x < __y;}
 };

-#if _LIBCPP_STD_VER > 11
-template <>
-struct _LIBCPP_TYPE_VIS_ONLY less<void>
-{
-    template <class _T1, class _T2> 
-    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
-    auto operator()(_T1&& __t, _T2&& __u) const
-        { return _VSTD::forward<_T1>(__t) < _VSTD::forward<_T2>(__u); }
-    typedef void is_transparent;
-};
-#endif
-
-// addressof
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-_Tp*
-addressof(_Tp& __x) _NOEXCEPT
-{
-    return (_Tp*)&reinterpret_cast<const volatile char&>(__x);
-}
-
-#if defined(_LIBCPP_HAS_OBJC_ARC) && !defined(_LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF)
-// Objective-C++ Automatic Reference Counting uses qualified pointers
-// that require special addressof() signatures. When
-// _LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF is defined, the compiler
-// itself is providing these definitions. Otherwise, we provide them.
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-__strong _Tp*
-addressof(__strong _Tp& __x) _NOEXCEPT
-{
-  return &__x;
-}
-
-#ifdef _LIBCPP_HAS_OBJC_ARC_WEAK
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-__weak _Tp*
-addressof(__weak _Tp& __x) _NOEXCEPT
-{
-  return &__x;
-}
-#endif
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-__autoreleasing _Tp*
-addressof(__autoreleasing _Tp& __x) _NOEXCEPT
-{
-  return &__x;
-}
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-__unsafe_unretained _Tp*
-addressof(__unsafe_unretained _Tp& __x) _NOEXCEPT
-{
-  return &__x;
-}
-#endif
-
 #ifdef _LIBCPP_HAS_NO_VARIADICS

 #include <__functional_base_03>
@@ -360,8 +292,7 @@ struct __weak_result_type<_Rp (_Cp::*)(_A1, _A2, _A3...) const volatile>

 // bullets 1 and 2

-template <class _Fp, class _A0, class ..._Args,
-            class>
+template <class _Fp, class _A0, class ..._Args>
 inline _LIBCPP_INLINE_VISIBILITY
 auto
 __invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args)
@@ -370,8 +301,7 @@ __invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args)
    return (_VSTD::forward<_A0>(__a0).*__f)(_VSTD::forward<_Args>(__args)...);
 }

-template <class _Fp, class _A0, class ..._Args,
-            class>
+template <class _Fp, class _A0, class ..._Args>
 inline _LIBCPP_INLINE_VISIBILITY
 auto
 __invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args)
@@ -382,8 +312,7 @@ __invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args)

 // bullets 3 and 4

-template <class _Fp, class _A0,
-            class>
+template <class _Fp, class _A0>
 inline _LIBCPP_INLINE_VISIBILITY
 auto
 __invoke(_Fp&& __f, _A0&& __a0)
@@ -392,8 +321,7 @@ __invoke(_Fp&& __f, _A0&& __a0)
    return _VSTD::forward<_A0>(__a0).*__f;
 }

-template <class _Fp, class _A0,
-            class>
+template <class _Fp, class _A0>
 inline _LIBCPP_INLINE_VISIBILITY
 auto
 __invoke(_Fp&& __f, _A0&& __a0)
@@ -420,7 +348,7 @@ struct __invoke_return
 };

 template <class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY reference_wrapper
+class _LIBCPP_TYPE_VIS reference_wrapper
    : public __weak_result_type<_Tp>
 {
 public:
@@ -431,8 +359,7 @@ private:

 public:
    // construct/copy/destroy
-    _LIBCPP_INLINE_VISIBILITY reference_wrapper(type& __f) _NOEXCEPT
-        : __f_(_VSTD::addressof(__f)) {}
+    _LIBCPP_INLINE_VISIBILITY reference_wrapper(type& __f) _NOEXCEPT : __f_(&__f) {}
 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
    private: reference_wrapper(type&&); public: // = delete; // do not bind to temps
 #endif
@@ -505,111 +432,6 @@ template <class _Tp> void cref(const _Tp&&);// = delete;

 #endif  // _LIBCPP_HAS_NO_VARIADICS

-#if _LIBCPP_STD_VER > 11
-template <class _Tp1, class _Tp2 = void>
-struct __is_transparent
-{
-private:
-    struct __two {char __lx; char __lxx;};
-    template <class _Up> static __two __test(...);
-    template <class _Up> static char __test(typename _Up::is_transparent* = 0);
-public:
-    static const bool value = sizeof(__test<_Tp1>(0)) == 1;
-};
-#endif
-
-// allocator_arg_t
-
-struct _LIBCPP_TYPE_VIS_ONLY allocator_arg_t { };
-
-#if defined(_LIBCPP_HAS_NO_CONSTEXPR) || defined(_LIBCPP_BUILDING_MEMORY)
-extern const allocator_arg_t allocator_arg;
-#else
-constexpr allocator_arg_t allocator_arg = allocator_arg_t();
-#endif
-
-// uses_allocator
-
-template <class _Tp>
-struct __has_allocator_type
-{
-private:
-    struct __two {char __lx; char __lxx;};
-    template <class _Up> static __two __test(...);
-    template <class _Up> static char __test(typename _Up::allocator_type* = 0);
-public:
-    static const bool value = sizeof(__test<_Tp>(0)) == 1;
-};
-
-template <class _Tp, class _Alloc, bool = __has_allocator_type<_Tp>::value>
-struct __uses_allocator
-    : public integral_constant<bool,
-        is_convertible<_Alloc, typename _Tp::allocator_type>::value>
-{
-};
-
-template <class _Tp, class _Alloc>
-struct __uses_allocator<_Tp, _Alloc, false>
-    : public false_type
-{
-};
-
-template <class _Tp, class _Alloc>
-struct _LIBCPP_TYPE_VIS_ONLY uses_allocator
-    : public __uses_allocator<_Tp, _Alloc>
-{
-};
-
-#ifndef _LIBCPP_HAS_NO_VARIADICS
-
-// allocator construction
-
-template <class _Tp, class _Alloc, class ..._Args>
-struct __uses_alloc_ctor_imp
-{
-    static const bool __ua = uses_allocator<_Tp, _Alloc>::value;
-    static const bool __ic =
-        is_constructible<_Tp, allocator_arg_t, _Alloc, _Args...>::value;
-    static const int value = __ua ? 2 - __ic : 0;
-};
-
-template <class _Tp, class _Alloc, class ..._Args>
-struct __uses_alloc_ctor
-    : integral_constant<int, __uses_alloc_ctor_imp<_Tp, _Alloc, _Args...>::value>
-    {};
-
-template <class _Tp, class _Allocator, class... _Args>
-inline _LIBCPP_INLINE_VISIBILITY
-void __user_alloc_construct_impl (integral_constant<int, 0>, _Tp *__storage, const _Allocator &, _Args &&... __args )
-{
-    new (__storage) _Tp (_VSTD::forward<_Args>(__args)...);
-}
-
-template <class _Tp, class _Allocator, class... _Args>
-inline _LIBCPP_INLINE_VISIBILITY
-void __user_alloc_construct_impl (integral_constant<int, 1>, _Tp *__storage, const _Allocator &__a, _Args &&... __args )
-{
-    new (__storage) _Tp (allocator_arg, __a, _VSTD::forward<_Args>(__args)...);
-}
-
-template <class _Tp, class _Allocator, class... _Args>
-inline _LIBCPP_INLINE_VISIBILITY
-void __user_alloc_construct_impl (integral_constant<int, 2>, _Tp *__storage, const _Allocator &__a, _Args &&... __args )
-{
-    new (__storage) _Tp (_VSTD::forward<_Args>(__args)..., __a);
-}
-
-template <class _Tp, class _Allocator, class... _Args>
-inline _LIBCPP_INLINE_VISIBILITY
-void __user_alloc_construct (_Tp *__storage, const _Allocator &__a, _Args &&... __args)
-{ 
-    __user_alloc_construct_impl( 
-             __uses_alloc_ctor<_Tp, _Allocator>(), 
-             __storage, __a, _VSTD::forward<_Args>(__args)...
-        );
-}
-#endif  // _LIBCPP_HAS_NO_VARIADICS
-
 _LIBCPP_END_NAMESPACE_STD

 #endif  // _LIBCPP_FUNCTIONAL_BASE
--- a/include/__functional_base_03
+++ b/include/__functional_base_03
@@ -996,7 +996,7 @@ struct __invoke_return2
 };

 template <class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY reference_wrapper
+class _LIBCPP_TYPE_VIS reference_wrapper
    : public __weak_result_type<_Tp>
 {
 public:
--- a/include/__hash_table
+++ b/include/__hash_table
--- a/include/__locale
+++ b/include/__locale
@@ -19,13 +19,11 @@
 #include <cstdint>
 #include <cctype>
 #include <locale.h>
-#if defined(_LIBCPP_MSVCRT) || defined(__MINGW32__)
+#ifdef _WIN32
 # include <support/win32/locale_win32.h>
-#elif _AIX
-# include <support/ibm/xlocale.h>
-#elif (defined(__GLIBC__) || defined(__APPLE__) || defined(__FreeBSD__) || defined(__sun__)) || defined(__EMSCRIPTEN__) || defined(__IBMCPP__)
+#elif (defined(__GLIBC__) || defined(__APPLE__) || defined(__FreeBSD__) || defined(__sun__)) || defined(EMSCRIPTEN)
 # include <xlocale.h>
-#endif  // _WIN32 || __GLIBC__ || __APPLE__ || __FreeBSD__ || __sun__ || __EMSCRIPTEN__ || __IBMCPP__
+#endif  // _WIN32 || __GLIBC__ || __APPLE__ || __FreeBSD__ || __sun__ || EMSCRIPTEN

 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
@@ -177,7 +175,7 @@ use_facet(const locale& __l)
 // template <class _CharT> class collate;

 template <class _CharT>
-class _LIBCPP_TYPE_VIS_ONLY collate
+class _LIBCPP_TYPE_VIS collate
    : public locale::facet
 {
 public:
@@ -256,12 +254,12 @@ collate<_CharT>::do_hash(const char_type* __lo, const char_type* __hi) const
    return static_cast<long>(__h);
 }

-_LIBCPP_EXTERN_TEMPLATE2(class _LIBCPP_TYPE_VIS collate<char>)
-_LIBCPP_EXTERN_TEMPLATE2(class _LIBCPP_TYPE_VIS collate<wchar_t>)
+_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_TYPE_VIS collate<char>)
+_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_TYPE_VIS collate<wchar_t>)

 // template <class CharT> class collate_byname;

-template <class _CharT> class _LIBCPP_TYPE_VIS_ONLY collate_byname;
+template <class _CharT> class _LIBCPP_TYPE_VIS collate_byname;

 template <>
 class _LIBCPP_TYPE_VIS collate_byname<char>
@@ -341,12 +339,12 @@ public:
    static const mask punct  = _PUNCT;
    static const mask xdigit = _HEX;
    static const mask blank  = _BLANK;
-#elif defined(__APPLE__) || defined(__FreeBSD__) || defined(__EMSCRIPTEN__) || defined(__NetBSD__)
+#elif (defined(__APPLE__) || defined(__FreeBSD__)) || defined(EMSCRIPTEN)
 #ifdef __APPLE__
    typedef __uint32_t mask;
 #elif defined(__FreeBSD__)
    typedef unsigned long mask;
-#elif defined(__EMSCRIPTEN__) ||  defined(__NetBSD__)
+#elif defined(EMSCRIPTEN)
    typedef unsigned short mask;
 #endif
    static const mask space  = _CTYPE_S;
@@ -358,12 +356,8 @@ public:
    static const mask digit  = _CTYPE_D;
    static const mask punct  = _CTYPE_P;
    static const mask xdigit = _CTYPE_X;
-# if defined(__NetBSD__)
-    static const mask blank  = _CTYPE_BL;
-# else
    static const mask blank  = _CTYPE_B;
-# endif
-#elif defined(__sun__) || defined(_AIX)
+#elif defined(__sun__)
    typedef unsigned int mask;
    static const mask space  = _ISSPACE;
    static const mask print  = _ISPRINT;
@@ -375,7 +369,7 @@ public:
    static const mask punct  = _ISPUNCT;
    static const mask xdigit = _ISXDIGIT;
    static const mask blank  = _ISBLANK;
-#else  // __GLIBC__ || _WIN32 || __APPLE__ || __FreeBSD__ || __EMSCRIPTEN__ || __sun__
+#else  // __GLIBC__ || _WIN32 || __APPLE__ || __FreeBSD__ || EMSCRIPTEN || __sun__
    typedef unsigned long mask;
    static const mask space  = 1<<0;
    static const mask print  = 1<<1;
@@ -394,7 +388,7 @@ public:
    _LIBCPP_ALWAYS_INLINE ctype_base() {}
 };

-template <class _CharT> class _LIBCPP_TYPE_VIS_ONLY ctype;
+template <class _CharT> class _LIBCPP_TYPE_VIS ctype;

 template <>
 class _LIBCPP_TYPE_VIS ctype<wchar_t>
@@ -512,7 +506,7 @@ public:
    _LIBCPP_ALWAYS_INLINE
    bool is(mask __m, char_type __c) const
    {
-        return isascii(__c) ? (__tab_[static_cast<int>(__c)] & __m) !=0 : false;
+        return isascii(__c) ? __tab_[static_cast<int>(__c)] & __m : false;
    }

    _LIBCPP_ALWAYS_INLINE
@@ -598,14 +592,10 @@ public:
 #endif
    _LIBCPP_ALWAYS_INLINE const mask* table() const  _NOEXCEPT {return __tab_;}
    static const mask* classic_table()  _NOEXCEPT;
-#if defined(__GLIBC__) || defined(__EMSCRIPTEN__)
+#if defined(__GLIBC__) || defined(EMSCRIPTEN)
    static const int* __classic_upper_table() _NOEXCEPT;
    static const int* __classic_lower_table() _NOEXCEPT;
 #endif
-#if defined(__NetBSD__)
-    static const short* __classic_upper_table() _NOEXCEPT;
-    static const short* __classic_lower_table() _NOEXCEPT;
-#endif

 protected:
    ~ctype();
@@ -621,7 +611,7 @@ protected:

 // template <class CharT> class ctype_byname;

-template <class _CharT> class _LIBCPP_TYPE_VIS_ONLY ctype_byname;
+template <class _CharT> class _LIBCPP_TYPE_VIS ctype_byname;

 template <>
 class _LIBCPP_TYPE_VIS ctype_byname<char>
@@ -782,7 +772,7 @@ public:

 // template <class internT, class externT, class stateT> class codecvt;

-template <class _InternT, class _ExternT, class _StateT> class _LIBCPP_TYPE_VIS_ONLY codecvt;
+template <class _InternT, class _ExternT, class _StateT> class _LIBCPP_TYPE_VIS codecvt;

 // template <> class codecvt<char, char, mbstate_t>

@@ -1128,7 +1118,7 @@ protected:
 // template <class _InternT, class _ExternT, class _StateT> class codecvt_byname

 template <class _InternT, class _ExternT, class _StateT>
-class _LIBCPP_TYPE_VIS_ONLY codecvt_byname
+class _LIBCPP_TYPE_VIS codecvt_byname
    : public codecvt<_InternT, _ExternT, _StateT>
 {
 public:
@@ -1147,10 +1137,10 @@ codecvt_byname<_InternT, _ExternT, _StateT>::~codecvt_byname()
 {
 }

-_LIBCPP_EXTERN_TEMPLATE2(class _LIBCPP_TYPE_VIS codecvt_byname<char, char, mbstate_t>)
-_LIBCPP_EXTERN_TEMPLATE2(class _LIBCPP_TYPE_VIS codecvt_byname<wchar_t, char, mbstate_t>)
-_LIBCPP_EXTERN_TEMPLATE2(class _LIBCPP_TYPE_VIS codecvt_byname<char16_t, char, mbstate_t>)
-_LIBCPP_EXTERN_TEMPLATE2(class _LIBCPP_TYPE_VIS codecvt_byname<char32_t, char, mbstate_t>)
+_LIBCPP_EXTERN_TEMPLATE(class codecvt_byname<char, char, mbstate_t>)
+_LIBCPP_EXTERN_TEMPLATE(class codecvt_byname<wchar_t, char, mbstate_t>)
+_LIBCPP_EXTERN_TEMPLATE(class codecvt_byname<char16_t, char, mbstate_t>)
+_LIBCPP_EXTERN_TEMPLATE(class codecvt_byname<char32_t, char, mbstate_t>)

 _LIBCPP_FUNC_VIS void __throw_runtime_error(const char*);

@@ -1336,7 +1326,7 @@ struct __widen_from_utf8<32>

 // template <class charT> class numpunct

-template <class _CharT> class _LIBCPP_TYPE_VIS_ONLY numpunct;
+template <class _CharT> class _LIBCPP_TYPE_VIS numpunct;

 template <>
 class _LIBCPP_TYPE_VIS numpunct<char>
@@ -1402,7 +1392,7 @@ protected:

 // template <class charT> class numpunct_byname

-template <class charT> class _LIBCPP_TYPE_VIS_ONLY numpunct_byname;
+template <class charT> class _LIBCPP_TYPE_VIS numpunct_byname;

 template <>
 class _LIBCPP_TYPE_VIS numpunct_byname<char>
--- a/include/__mutex_base
+++ b/include/__mutex_base
@@ -20,6 +20,16 @@
 #pragma GCC system_header
 #endif

+#ifdef _LIBCPP_SHARED_LOCK
+
+namespace ting {
+template <class _Mutex> class shared_lock;
+template <class _Mutex> class upgrade_lock;
+}
+
+#endif  // _LIBCPP_SHARED_LOCK
+
+
 _LIBCPP_BEGIN_NAMESPACE_STD

 class _LIBCPP_TYPE_VIS mutex
@@ -67,7 +77,7 @@ constexpr adopt_lock_t  adopt_lock  = adopt_lock_t();
 #endif

 template <class _Mutex>
-class _LIBCPP_TYPE_VIS_ONLY lock_guard
+class _LIBCPP_TYPE_VIS lock_guard
 {
 public:
    typedef _Mutex mutex_type;
@@ -91,7 +101,7 @@ private:
 };

 template <class _Mutex>
-class _LIBCPP_TYPE_VIS_ONLY unique_lock
+class _LIBCPP_TYPE_VIS unique_lock
 {
 public:
    typedef _Mutex mutex_type;
@@ -152,6 +162,27 @@ public:
            return *this;
        }

+#ifdef _LIBCPP_SHARED_LOCK
+
+    unique_lock(ting::shared_lock<mutex_type>&&, try_to_lock_t);
+    template <class _Clock, class _Duration>
+        unique_lock(ting::shared_lock<mutex_type>&&,
+                    const chrono::time_point<_Clock, _Duration>&);
+    template <class _Rep, class _Period>
+        unique_lock(ting::shared_lock<mutex_type>&&,
+                    const chrono::duration<_Rep, _Period>&);
+
+    explicit unique_lock(ting::upgrade_lock<mutex_type>&&);
+    unique_lock(ting::upgrade_lock<mutex_type>&&, try_to_lock_t);
+    template <class _Clock, class _Duration>
+        unique_lock(ting::upgrade_lock<mutex_type>&&,
+                    const chrono::time_point<_Clock, _Duration>&);
+    template <class _Rep, class _Period>
+        unique_lock(ting::upgrade_lock<mutex_type>&&,
+                    const chrono::duration<_Rep, _Period>&);
+
+#endif  // _LIBCPP_SHARED_LOCK
+
 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES

    void lock();
--- a/include/__split_buffer
+++ b/include/__split_buffer
@@ -285,16 +285,16 @@ __split_buffer<_Tp, _Allocator>::__construct_at_end(_ForwardIterator __first, _F
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
 __split_buffer<_Tp, _Allocator>::__destruct_at_begin(pointer __new_begin, false_type)
 {
    while (__begin_ != __new_begin)
-        __alloc_traits::destroy(__alloc(), __to_raw_pointer(__begin_++));
+        __alloc_traits::destroy(__alloc(), __begin_++);
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
 __split_buffer<_Tp, _Allocator>::__destruct_at_begin(pointer __new_begin, true_type)
 {
@@ -302,16 +302,16 @@ __split_buffer<_Tp, _Allocator>::__destruct_at_begin(pointer __new_begin, true_t
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
 __split_buffer<_Tp, _Allocator>::__destruct_at_end(pointer __new_last, false_type) _NOEXCEPT
 {
    while (__new_last != __end_)
-        __alloc_traits::destroy(__alloc(), __to_raw_pointer(--__end_));
+        __alloc_traits::destroy(__alloc(), --__end_);
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
 __split_buffer<_Tp, _Allocator>::__destruct_at_end(pointer __new_last, true_type) _NOEXCEPT
 {
@@ -320,7 +320,7 @@ __split_buffer<_Tp, _Allocator>::__destruct_at_end(pointer __new_last, true_type

 template <class _Tp, class _Allocator>
 __split_buffer<_Tp, _Allocator>::__split_buffer(size_type __cap, size_type __start, __alloc_rr& __a)
-    : __end_cap_(nullptr, __a)
+    : __end_cap_(0, __a)
 {
    __first_ = __cap != 0 ? __alloc_traits::allocate(__alloc(), __cap) : nullptr;
    __begin_ = __end_ = __first_ + __start;
@@ -328,24 +328,24 @@ __split_buffer<_Tp, _Allocator>::__split_buffer(size_type __cap, size_type __sta
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 __split_buffer<_Tp, _Allocator>::__split_buffer()
    _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
-    : __first_(nullptr), __begin_(nullptr), __end_(nullptr), __end_cap_(nullptr)
+    : __first_(0), __begin_(0), __end_(0), __end_cap_(0)
 {
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 __split_buffer<_Tp, _Allocator>::__split_buffer(__alloc_rr& __a)
-    : __first_(nullptr), __begin_(nullptr), __end_(nullptr), __end_cap_(nullptr, __a)
+    : __first_(0), __begin_(0), __end_(0), __end_cap_(0, __a)
 {
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 __split_buffer<_Tp, _Allocator>::__split_buffer(const __alloc_rr& __a)
-    : __first_(nullptr), __begin_(nullptr), __end_(nullptr), __end_cap_(nullptr, __a)
+    : __first_(0), __begin_(0), __end_(0), __end_cap_(0, __a)
 {
 }

@@ -541,7 +541,7 @@ __split_buffer<_Tp, _Allocator>::push_front(value_type&& __x)
 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
 __split_buffer<_Tp, _Allocator>::push_back(const_reference __x)
 {
@@ -640,7 +640,7 @@ __split_buffer<_Tp, _Allocator>::emplace_back(_Args&&... __args)
 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
 swap(__split_buffer<_Tp, _Allocator>& __x, __split_buffer<_Tp, _Allocator>& __y)
        _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
--- a/include/__std_stream
+++ b/include/__std_stream
@@ -55,8 +55,6 @@ private:
    const codecvt<char_type, char, state_type>* __cv_;
    state_type* __st_;
    int __encoding_;
-    int_type __last_consumed_;
-    bool __last_consumed_is_next_;
    bool __always_noconv_;

    __stdinbuf(const __stdinbuf&);
@@ -68,9 +66,7 @@ private:
 template <class _CharT>
 __stdinbuf<_CharT>::__stdinbuf(FILE* __fp, state_type* __st)
    : __file_(__fp),
-      __st_(__st),
-      __last_consumed_(traits_type::eof()),
-      __last_consumed_is_next_(false)
+      __st_(__st)
 {
    imbue(this->getloc());
 }
@@ -104,16 +100,6 @@ template <class _CharT>
 typename __stdinbuf<_CharT>::int_type
 __stdinbuf<_CharT>::__getchar(bool __consume)
 {
-    if (__last_consumed_is_next_)
-    {
-        int_type __result = __last_consumed_;
-        if (__consume)
-        {
-            __last_consumed_ = traits_type::eof();
-            __last_consumed_is_next_ = false;
-        }
-        return __result;
-    }
    char __extbuf[__limit];
    int __nread = _VSTD::max(1, __encoding_);
    for (int __i = 0; __i < __nread; ++__i)
@@ -168,8 +154,6 @@ __stdinbuf<_CharT>::__getchar(bool __consume)
                return traits_type::eof();
        }
    }
-    else
-        __last_consumed_ = traits_type::to_int_type(__1buf);
    return traits_type::to_int_type(__1buf);
 }

@@ -178,41 +162,28 @@ typename __stdinbuf<_CharT>::int_type
 __stdinbuf<_CharT>::pbackfail(int_type __c)
 {
    if (traits_type::eq_int_type(__c, traits_type::eof()))
-    {
-        if (!__last_consumed_is_next_)
-        {
-            __c = __last_consumed_;
-            __last_consumed_is_next_ = !traits_type::eq_int_type(__last_consumed_,
-                                                                 traits_type::eof());
-        }
        return __c;
-    }
-    if (__last_consumed_is_next_)
+    char __extbuf[__limit];
+    char* __enxt;
+    const char_type __ci = traits_type::to_char_type(__c);
+    const char_type* __inxt;
+    switch (__cv_->out(*__st_, &__ci, &__ci + 1, __inxt,
+                              __extbuf, __extbuf + sizeof(__extbuf), __enxt))
    {
-        char __extbuf[__limit];
-        char* __enxt;
-        const char_type __ci = traits_type::to_char_type(__last_consumed_);
-        const char_type* __inxt;
-        switch (__cv_->out(*__st_, &__ci, &__ci + 1, __inxt,
-                                  __extbuf, __extbuf + sizeof(__extbuf), __enxt))
-        {
-        case _VSTD::codecvt_base::ok:
-            break;
-        case _VSTD::codecvt_base::noconv:
-            __extbuf[0] = static_cast<char>(__last_consumed_);
-            __enxt = __extbuf + 1;
-            break;
-        case codecvt_base::partial:
-        case codecvt_base::error:
-            return traits_type::eof();
-        }
-        while (__enxt > __extbuf)
-            if (ungetc(*--__enxt, __file_) == EOF)
-                return traits_type::eof();
+    case _VSTD::codecvt_base::ok:
+        break;
+    case _VSTD::codecvt_base::noconv:
+        __extbuf[0] = static_cast<char>(__c);
+        __enxt = __extbuf + 1;
+        break;
+    case codecvt_base::partial:
+    case codecvt_base::error:
+        return traits_type::eof();
    }
-    __last_consumed_ = __c;
-    __last_consumed_is_next_ = true;
-    return __c;
+    while (__enxt > __extbuf)
+        if (ungetc(*--__enxt, __file_) == EOF)
+            return traits_type::eof();
+ return traits_type::not_eof(__c);
 }

 // __stdoutbuf
@@ -233,7 +204,6 @@ public:

 protected:
    virtual int_type overflow (int_type __c = traits_type::eof());
-    virtual streamsize xsputn(const char_type* __s, streamsize __n);
    virtual int sync();
    virtual void imbue(const locale& __loc);

@@ -264,31 +234,30 @@ __stdoutbuf<_CharT>::overflow(int_type __c)
    char_type __1buf;
    if (!traits_type::eq_int_type(__c, traits_type::eof()))
    {
-        __1buf = traits_type::to_char_type(__c);
+        this->setp(&__1buf, &__1buf+1);
+        *this->pptr() = traits_type::to_char_type(__c);
+        this->pbump(1);
        if (__always_noconv_)
        {
-            if (fwrite(&__1buf, sizeof(char_type), 1, __file_) != 1)
+            if (fwrite(this->pbase(), sizeof(char_type), 1, __file_) != 1)
                return traits_type::eof();
        }
        else
        {
            char* __extbe = __extbuf;
            codecvt_base::result __r;
-            char_type* pbase = &__1buf;
-            char_type* pptr = pbase + 1;
-            char_type* epptr = pptr;
            do
            {
                const char_type* __e;
-                __r = __cv_->out(*__st_, pbase, pptr, __e,
+                __r = __cv_->out(*__st_, this->pbase(), this->pptr(), __e,
                                        __extbuf,
                                        __extbuf + sizeof(__extbuf),
                                        __extbe);
-                if (__e == pbase)
+                if (__e == this->pbase())
                    return traits_type::eof();
                if (__r == codecvt_base::noconv)
                {
-                    if (fwrite(pbase, 1, 1, __file_) != 1)
+                    if (fwrite(this->pbase(), 1, 1, __file_) != 1)
                        return traits_type::eof();
                }
                else if (__r == codecvt_base::ok || __r == codecvt_base::partial)
@@ -298,30 +267,19 @@ __stdoutbuf<_CharT>::overflow(int_type __c)
                        return traits_type::eof();
                    if (__r == codecvt_base::partial)
                    {
-                        pbase = (char_type*)__e;
+                        this->setp((char_type*)__e, this->pptr());
+                        this->pbump(static_cast<int>(this->epptr() - this->pbase()));
                    }
                }
                else
                    return traits_type::eof();
            } while (__r == codecvt_base::partial);
        }
+        this->setp(0, 0);
    }
    return traits_type::not_eof(__c);
 }

-template <class _CharT>
-streamsize
-__stdoutbuf<_CharT>::xsputn(const char_type* __s, streamsize __n)
-{
-    if (__always_noconv_)
-        return fwrite(__s, sizeof(char_type), __n, __file_);
-    streamsize __i = 0;
-    for (; __i < __n; ++__i, ++__s)
-        if (overflow(traits_type::to_int_type(*__s)) == traits_type::eof())
-            break;
-    return __i;
-}
-
 template <class _CharT>
 int
 __stdoutbuf<_CharT>::sync()
--- a/include/__tree
+++ b/include/__tree
@@ -25,17 +25,17 @@ _LIBCPP_BEGIN_NAMESPACE_STD

 template <class _Tp, class _Compare, class _Allocator> class __tree;
 template <class _Tp, class _NodePtr, class _DiffType>
-    class _LIBCPP_TYPE_VIS_ONLY __tree_iterator;
+    class _LIBCPP_TYPE_VIS __tree_iterator;
 template <class _Tp, class _ConstNodePtr, class _DiffType>
-    class _LIBCPP_TYPE_VIS_ONLY __tree_const_iterator;
+    class _LIBCPP_TYPE_VIS __tree_const_iterator;
 template <class _Key, class _Tp, class _Compare, class _Allocator>
-    class _LIBCPP_TYPE_VIS_ONLY map;
+    class _LIBCPP_TYPE_VIS map;
 template <class _Key, class _Tp, class _Compare, class _Allocator>
-    class _LIBCPP_TYPE_VIS_ONLY multimap;
+    class _LIBCPP_TYPE_VIS multimap;
 template <class _Key, class _Compare, class _Allocator>
-    class _LIBCPP_TYPE_VIS_ONLY set;
+    class _LIBCPP_TYPE_VIS set;
 template <class _Key, class _Compare, class _Allocator>
-    class _LIBCPP_TYPE_VIS_ONLY multiset;
+    class _LIBCPP_TYPE_VIS multiset;

 /*

@@ -614,11 +614,11 @@ public:
 #endif  // !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_VARIADICS)
 };

-template <class _TreeIterator> class _LIBCPP_TYPE_VIS_ONLY __map_iterator;
-template <class _TreeIterator> class _LIBCPP_TYPE_VIS_ONLY __map_const_iterator;
+template <class _TreeIterator> class _LIBCPP_TYPE_VIS __map_iterator;
+template <class _TreeIterator> class _LIBCPP_TYPE_VIS __map_const_iterator;

 template <class _Tp, class _NodePtr, class _DiffType>
-class _LIBCPP_TYPE_VIS_ONLY __tree_iterator
+class _LIBCPP_TYPE_VIS __tree_iterator
 {
    typedef _NodePtr                                              __node_pointer;
    typedef typename pointer_traits<__node_pointer>::element_type __node;
@@ -641,15 +641,10 @@ public:
 #endif
                                       pointer;

-    _LIBCPP_INLINE_VISIBILITY __tree_iterator() _NOEXCEPT
-#if _LIBCPP_STD_VER > 11
-    : __ptr_(nullptr)
-#endif
-    {}
+    _LIBCPP_INLINE_VISIBILITY __tree_iterator() _NOEXCEPT {}

    _LIBCPP_INLINE_VISIBILITY reference operator*() const {return __ptr_->__value_;}
-    _LIBCPP_INLINE_VISIBILITY pointer operator->() const
-        {return pointer_traits<pointer>::pointer_to(__ptr_->__value_);}
+    _LIBCPP_INLINE_VISIBILITY pointer operator->() const {return &__ptr_->__value_;}

    _LIBCPP_INLINE_VISIBILITY
    __tree_iterator& operator++()
@@ -678,20 +673,20 @@ private:
    _LIBCPP_INLINE_VISIBILITY
    explicit __tree_iterator(__node_pointer __p) _NOEXCEPT : __ptr_(__p) {}
    template <class, class, class> friend class __tree;
-    template <class, class, class> friend class _LIBCPP_TYPE_VIS_ONLY __tree_const_iterator;
-    template <class> friend class _LIBCPP_TYPE_VIS_ONLY __map_iterator;
-    template <class, class, class, class> friend class _LIBCPP_TYPE_VIS_ONLY map;
-    template <class, class, class, class> friend class _LIBCPP_TYPE_VIS_ONLY multimap;
-    template <class, class, class> friend class _LIBCPP_TYPE_VIS_ONLY set;
-    template <class, class, class> friend class _LIBCPP_TYPE_VIS_ONLY multiset;
+    template <class, class, class> friend class _LIBCPP_TYPE_VIS __tree_const_iterator;
+    template <class> friend class _LIBCPP_TYPE_VIS __map_iterator;
+    template <class, class, class, class> friend class _LIBCPP_TYPE_VIS map;
+    template <class, class, class, class> friend class _LIBCPP_TYPE_VIS multimap;
+    template <class, class, class> friend class _LIBCPP_TYPE_VIS set;
+    template <class, class, class> friend class _LIBCPP_TYPE_VIS multiset;
 };

 template <class _Tp, class _ConstNodePtr, class _DiffType>
-class _LIBCPP_TYPE_VIS_ONLY __tree_const_iterator
+class _LIBCPP_TYPE_VIS __tree_const_iterator
 {
    typedef _ConstNodePtr                                         __node_pointer;
    typedef typename pointer_traits<__node_pointer>::element_type __node;
-    typedef typename __node::base                                 __node_base;
+    typedef const typename __node::base                           __node_base;
    typedef typename pointer_traits<__node_pointer>::template
 #ifndef _LIBCPP_HAS_NO_TEMPLATE_ALIASES
            rebind<__node_base>
@@ -716,12 +711,7 @@ public:
 #endif
                                       pointer;

-    _LIBCPP_INLINE_VISIBILITY __tree_const_iterator() _NOEXCEPT
-#if _LIBCPP_STD_VER > 11
-    : __ptr_(nullptr)
-#endif
-    {}
-
+    _LIBCPP_INLINE_VISIBILITY __tree_const_iterator() {}
 private:
    typedef typename remove_const<__node>::type  __non_const_node;
    typedef typename pointer_traits<__node_pointer>::template
@@ -739,8 +729,7 @@ public:
        : __ptr_(__p.__ptr_) {}

    _LIBCPP_INLINE_VISIBILITY reference operator*() const {return __ptr_->__value_;}
-    _LIBCPP_INLINE_VISIBILITY pointer operator->() const
-        {return pointer_traits<pointer>::pointer_to(__ptr_->__value_);}
+    _LIBCPP_INLINE_VISIBILITY pointer operator->() const {return &__ptr_->__value_;}

    _LIBCPP_INLINE_VISIBILITY
    __tree_const_iterator& operator++()
@@ -770,11 +759,11 @@ private:
    explicit __tree_const_iterator(__node_pointer __p) _NOEXCEPT
        : __ptr_(__p) {}
    template <class, class, class> friend class __tree;
-    template <class, class, class, class> friend class _LIBCPP_TYPE_VIS_ONLY map;
-    template <class, class, class, class> friend class _LIBCPP_TYPE_VIS_ONLY multimap;
-    template <class, class, class> friend class _LIBCPP_TYPE_VIS_ONLY set;
-    template <class, class, class> friend class _LIBCPP_TYPE_VIS_ONLY multiset;
-    template <class> friend class _LIBCPP_TYPE_VIS_ONLY __map_const_iterator;
+    template <class, class, class, class> friend class _LIBCPP_TYPE_VIS map;
+    template <class, class, class, class> friend class _LIBCPP_TYPE_VIS multimap;
+    template <class, class, class> friend class _LIBCPP_TYPE_VIS set;
+    template <class, class, class> friend class _LIBCPP_TYPE_VIS multiset;
+    template <class> friend class _LIBCPP_TYPE_VIS __map_const_iterator;
 };

 template <class _Tp, class _Compare, class _Allocator>
@@ -790,10 +779,8 @@ public:
    typedef typename __alloc_traits::size_type       size_type;
    typedef typename __alloc_traits::difference_type difference_type;

-    typedef typename __alloc_traits::void_pointer  __void_pointer;
-
-    typedef __tree_node<value_type, __void_pointer> __node;
-    typedef __tree_node_base<__void_pointer>        __node_base;
+    typedef __tree_node<value_type, typename __alloc_traits::void_pointer> __node;
+    typedef __tree_node_base<typename __alloc_traits::void_pointer> __node_base;
    typedef typename __alloc_traits::template
 #ifndef _LIBCPP_HAS_NO_TEMPLATE_ALIASES
            rebind_alloc<__node>
@@ -803,9 +790,9 @@ public:
                                                     __node_allocator;
    typedef allocator_traits<__node_allocator>       __node_traits;
    typedef typename __node_traits::pointer          __node_pointer;
-    typedef typename __node_traits::pointer          __node_const_pointer;
+    typedef typename __node_traits::const_pointer    __node_const_pointer;
    typedef typename __node_base::pointer            __node_base_pointer;
-    typedef typename __node_base::pointer            __node_base_const_pointer;
+    typedef typename __node_base::const_pointer      __node_base_const_pointer;
 private:
    typedef typename __node_base::base __end_node_t;
    typedef typename pointer_traits<__node_pointer>::template
@@ -817,9 +804,9 @@ private:
                                                     __end_node_ptr;
    typedef typename pointer_traits<__node_pointer>::template
 #ifndef _LIBCPP_HAS_NO_TEMPLATE_ALIASES
-            rebind<__end_node_t>
+            rebind<const __end_node_t>
 #else
-            rebind<__end_node_t>::other
+            rebind<const __end_node_t>::other
 #endif
                                                     __end_node_const_ptr;

@@ -841,7 +828,7 @@ public:
    {
        return static_cast<__node_const_pointer>
               (
-                   pointer_traits<__end_node_const_ptr>::pointer_to(const_cast<__end_node_t&>(__pair1_.first()))
+                   pointer_traits<__end_node_const_ptr>::pointer_to(__pair1_.first())
               );
    }
    _LIBCPP_INLINE_VISIBILITY
@@ -878,7 +865,7 @@ public:
        {return static_cast<__node_const_pointer>(__end_node()->__left_);}

    typedef __tree_iterator<value_type, __node_pointer, difference_type>             iterator;
-    typedef __tree_const_iterator<value_type, __node_pointer, difference_type> const_iterator;
+    typedef __tree_const_iterator<value_type, __node_const_pointer, difference_type> const_iterator;

    explicit __tree(const value_compare& __comp)
        _NOEXCEPT_(
@@ -1115,9 +1102,6 @@ private:

    __node_pointer __detach();
    static __node_pointer __detach(__node_pointer);
-
-    template <class, class, class, class> friend class _LIBCPP_TYPE_VIS_ONLY map;
-    template <class, class, class, class> friend class _LIBCPP_TYPE_VIS_ONLY multimap;
 };

 template <class _Tp, class _Compare, class _Allocator>
@@ -1177,7 +1161,7 @@ __tree<_Tp, _Compare, _Allocator>::__detach(__node_pointer __cache)
 {
    if (__cache->__parent_ == nullptr)
        return nullptr;
-    if (__tree_is_left_child(static_cast<__node_base_pointer>(__cache)))
+    if (__tree_is_left_child(__cache))
    {
        __cache->__parent_->__left_ = nullptr;
        __cache = static_cast<__node_pointer>(__cache->__parent_);
@@ -1310,7 +1294,7 @@ __tree<_Tp, _Compare, _Allocator>::__tree(__tree&& __t)
        __begin_node() = __end_node();
    else
    {
-        __end_node()->__left_->__parent_ = static_cast<__node_base_pointer>(__end_node());
+        __end_node()->__left_->__parent_ = __end_node();
        __t.__begin_node() = __t.__end_node();
        __t.__end_node()->__left_ = nullptr;
        __t.size() = 0;
@@ -1330,7 +1314,7 @@ __tree<_Tp, _Compare, _Allocator>::__tree(__tree&& __t, const allocator_type& __
        {
            __begin_node() = __t.__begin_node();
            __end_node()->__left_ = __t.__end_node()->__left_;
-            __end_node()->__left_->__parent_ = static_cast<__node_base_pointer>(__end_node());
+            __end_node()->__left_->__parent_ = __end_node();
            size() = __t.size();
            __t.__begin_node() = __t.__end_node();
            __t.__end_node()->__left_ = nullptr;
@@ -1358,7 +1342,7 @@ __tree<_Tp, _Compare, _Allocator>::__move_assign(__tree& __t, true_type)
        __begin_node() = __end_node();
    else
    {
-        __end_node()->__left_->__parent_ = static_cast<__node_base_pointer>(__end_node());
+        __end_node()->__left_->__parent_ = __end_node();
        __t.__begin_node() = __t.__end_node();
        __t.__end_node()->__left_ = nullptr;
        __t.size() = 0;
@@ -1463,11 +1447,11 @@ __tree<_Tp, _Compare, _Allocator>::swap(__tree& __t)
    if (size() == 0)
        __begin_node() = __end_node();
    else
-        __end_node()->__left_->__parent_ = static_cast<__node_base_pointer>(__end_node());
+        __end_node()->__left_->__parent_ = __end_node();
    if (__t.size() == 0)
        __t.__begin_node() = __t.__end_node();
    else
-        __t.__end_node()->__left_->__parent_ = static_cast<__node_base_pointer>(__t.__end_node());
+        __t.__end_node()->__left_->__parent_ = __t.__end_node();
 }

 template <class _Tp, class _Compare, class _Allocator>
@@ -1499,7 +1483,7 @@ __tree<_Tp, _Compare, _Allocator>::__find_leaf_low(typename __node_base::pointer
                    __nd = static_cast<__node_pointer>(__nd->__right_);
                else
                {
-                    __parent = static_cast<__node_base_pointer>(__nd);
+                    __parent = __nd;
                    return __parent->__right_;
                }
            }
@@ -1509,13 +1493,13 @@ __tree<_Tp, _Compare, _Allocator>::__find_leaf_low(typename __node_base::pointer
                    __nd = static_cast<__node_pointer>(__nd->__left_);
                else
                {
-                    __parent = static_cast<__node_base_pointer>(__nd);
+                    __parent = __nd;
                    return __parent->__left_;
                }
            }
        }
    }
-    __parent = static_cast<__node_base_pointer>(__end_node());
+    __parent = __end_node();
    return __parent->__left_;
 }

@@ -1538,7 +1522,7 @@ __tree<_Tp, _Compare, _Allocator>::__find_leaf_high(typename __node_base::pointe
                    __nd = static_cast<__node_pointer>(__nd->__left_);
                else
                {
-                    __parent = static_cast<__node_base_pointer>(__nd);
+                    __parent = __nd;
                    return __parent->__left_;
                }
            }
@@ -1548,13 +1532,13 @@ __tree<_Tp, _Compare, _Allocator>::__find_leaf_high(typename __node_base::pointe
                    __nd = static_cast<__node_pointer>(__nd->__right_);
                else
                {
-                    __parent = static_cast<__node_base_pointer>(__nd);
+                    __parent = __nd;
                    return __parent->__right_;
                }
            }
        }
    }
-    __parent = static_cast<__node_base_pointer>(__end_node());
+    __parent = __end_node();
    return __parent->__left_;
 }

@@ -1579,12 +1563,12 @@ __tree<_Tp, _Compare, _Allocator>::__find_leaf(const_iterator __hint,
            // *prev(__hint) <= __v <= *__hint
            if (__hint.__ptr_->__left_ == nullptr)
            {
-                __parent = static_cast<__node_base_pointer>(__hint.__ptr_);
+                __parent = const_cast<__node_pointer&>(__hint.__ptr_);
                return __parent->__left_;
            }
            else
            {
-                __parent = static_cast<__node_base_pointer>(__prior.__ptr_);
+                __parent = const_cast<__node_pointer&>(__prior.__ptr_);
                return __parent->__right_;
            }
        }
@@ -1616,7 +1600,7 @@ __tree<_Tp, _Compare, _Allocator>::__find_equal(typename __node_base::pointer& _
                    __nd = static_cast<__node_pointer>(__nd->__left_);
                else
                {
-                    __parent = static_cast<__node_base_pointer>(__nd);
+                    __parent = __nd;
                    return __parent->__left_;
                }
            }
@@ -1626,18 +1610,18 @@ __tree<_Tp, _Compare, _Allocator>::__find_equal(typename __node_base::pointer& _
                    __nd = static_cast<__node_pointer>(__nd->__right_);
                else
                {
-                    __parent = static_cast<__node_base_pointer>(__nd);
+                    __parent = __nd;
                    return __parent->__right_;
                }
            }
            else
            {
-                __parent = static_cast<__node_base_pointer>(__nd);
+                __parent = __nd;
                return __parent;
            }
        }
    }
-    __parent = static_cast<__node_base_pointer>(__end_node());
+    __parent = __end_node();
    return __parent->__left_;
 }

@@ -1664,12 +1648,12 @@ __tree<_Tp, _Compare, _Allocator>::__find_equal(const_iterator __hint,
            // *prev(__hint) < __v < *__hint
            if (__hint.__ptr_->__left_ == nullptr)
            {
-                __parent = static_cast<__node_base_pointer>(__hint.__ptr_);
+                __parent = const_cast<__node_pointer&>(__hint.__ptr_);
                return __parent->__left_;
            }
            else
            {
-                __parent = static_cast<__node_base_pointer>(__prior.__ptr_);
+                __parent = const_cast<__node_pointer&>(__prior.__ptr_);
                return __parent->__right_;
            }
        }
@@ -1685,12 +1669,12 @@ __tree<_Tp, _Compare, _Allocator>::__find_equal(const_iterator __hint,
            // *__hint < __v < *_VSTD::next(__hint)
            if (__hint.__ptr_->__right_ == nullptr)
            {
-                __parent = static_cast<__node_base_pointer>(__hint.__ptr_);
+                __parent = const_cast<__node_pointer&>(__hint.__ptr_);
                return __parent->__right_;
            }
            else
            {
-                __parent = static_cast<__node_base_pointer>(__next.__ptr_);
+                __parent = const_cast<__node_pointer&>(__next.__ptr_);
                return __parent->__left_;
            }
        }
@@ -1698,7 +1682,7 @@ __tree<_Tp, _Compare, _Allocator>::__find_equal(const_iterator __hint,
        return __find_equal(__parent, __v);
    }
    // else __v == *__hint
-    __parent = static_cast<__node_base_pointer>(__hint.__ptr_);
+    __parent = const_cast<__node_pointer&>(__hint.__ptr_);
    return __parent;
 }

@@ -1745,7 +1729,7 @@ __tree<_Tp, _Compare, _Allocator>::__emplace_unique(_Args&&... __args)
    bool __inserted = false;
    if (__child == nullptr)
    {
-        __insert_node_at(__parent, __child, static_cast<__node_base_pointer>(__h.get()));
+        __insert_node_at(__parent, __child, __h.get());
        __r = __h.release();
        __inserted = true;
    }
@@ -1763,7 +1747,7 @@ __tree<_Tp, _Compare, _Allocator>::__emplace_hint_unique(const_iterator __p, _Ar
    __node_pointer __r = static_cast<__node_pointer>(__child);
    if (__child == nullptr)
    {
-        __insert_node_at(__parent, __child, static_cast<__node_base_pointer>(__h.get()));
+        __insert_node_at(__parent, __child, __h.get());
        __r = __h.release();
    }
    return iterator(__r);
@@ -1777,7 +1761,7 @@ __tree<_Tp, _Compare, _Allocator>::__emplace_multi(_Args&&... __args)
    __node_holder __h = __construct_node(_VSTD::forward<_Args>(__args)...);
    __node_base_pointer __parent;
    __node_base_pointer& __child = __find_leaf_high(__parent, __h->__value_);
-    __insert_node_at(__parent, __child, static_cast<__node_base_pointer>(__h.get()));
+    __insert_node_at(__parent, __child, __h.get());
    return iterator(static_cast<__node_pointer>(__h.release()));
 }

@@ -1790,7 +1774,7 @@ __tree<_Tp, _Compare, _Allocator>::__emplace_hint_multi(const_iterator __p,
    __node_holder __h = __construct_node(_VSTD::forward<_Args>(__args)...);
    __node_base_pointer __parent;
    __node_base_pointer& __child = __find_leaf(__p, __parent, __h->__value_);
-    __insert_node_at(__parent, __child, static_cast<__node_base_pointer>(__h.get()));
+    __insert_node_at(__parent, __child, __h.get());
    return iterator(static_cast<__node_pointer>(__h.release()));
 }

@@ -1828,7 +1812,7 @@ __tree<_Tp, _Compare, _Allocator>::__insert_multi(_Vp&& __v)
    __node_holder __h = __construct_node(_VSTD::forward<_Vp>(__v));
    __node_base_pointer __parent;
    __node_base_pointer& __child = __find_leaf_high(__parent, __h->__value_);
-    __insert_node_at(__parent, __child, static_cast<__node_base_pointer>(__h.get()));
+    __insert_node_at(__parent, __child, __h.get());
    return iterator(__h.release());
 }

@@ -1840,7 +1824,7 @@ __tree<_Tp, _Compare, _Allocator>::__insert_multi(const_iterator __p, _Vp&& __v)
    __node_holder __h = __construct_node(_VSTD::forward<_Vp>(__v));
    __node_base_pointer __parent;
    __node_base_pointer& __child = __find_leaf(__p, __parent, __h->__value_);
-    __insert_node_at(__parent, __child, static_cast<__node_base_pointer>(__h.get()));
+    __insert_node_at(__parent, __child, __h.get());
    return iterator(__h.release());
 }

@@ -1854,7 +1838,7 @@ __tree<_Tp, _Compare, _Allocator>::__construct_node(const value_type& __v)
    __node_holder __h(__node_traits::allocate(__na, 1), _Dp(__na));
    __node_traits::construct(__na, _VSTD::addressof(__h->__value_), __v);
    __h.get_deleter().__value_constructed = true;
-    return _VSTD::move(__h);  // explicitly moved for C++03
+    return _VSTD::move(__h);
 }

 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
@@ -1870,7 +1854,7 @@ __tree<_Tp, _Compare, _Allocator>::__insert_unique(const value_type& __v)
    if (__child == nullptr)
    {
        __node_holder __h = __construct_node(__v);
-        __insert_node_at(__parent, __child, static_cast<__node_base_pointer>(__h.get()));
+        __insert_node_at(__parent, __child, __h.get());
        __r = __h.release();
        __inserted = true;
    }
@@ -1887,7 +1871,7 @@ __tree<_Tp, _Compare, _Allocator>::__insert_unique(const_iterator __p, const val
    if (__child == nullptr)
    {
        __node_holder __h = __construct_node(__v);
-        __insert_node_at(__parent, __child, static_cast<__node_base_pointer>(__h.get()));
+        __insert_node_at(__parent, __child, __h.get());
        __r = __h.release();
    }
    return iterator(__r);
@@ -1900,7 +1884,7 @@ __tree<_Tp, _Compare, _Allocator>::__insert_multi(const value_type& __v)
    __node_base_pointer __parent;
    __node_base_pointer& __child = __find_leaf_high(__parent, __v);
    __node_holder __h = __construct_node(__v);
-    __insert_node_at(__parent, __child, static_cast<__node_base_pointer>(__h.get()));
+    __insert_node_at(__parent, __child, __h.get());
    return iterator(__h.release());
 }

@@ -1911,7 +1895,7 @@ __tree<_Tp, _Compare, _Allocator>::__insert_multi(const_iterator __p, const valu
    __node_base_pointer __parent;
    __node_base_pointer& __child = __find_leaf(__p, __parent, __v);
    __node_holder __h = __construct_node(__v);
-    __insert_node_at(__parent, __child, static_cast<__node_base_pointer>(__h.get()));
+    __insert_node_at(__parent, __child, __h.get());
    return iterator(__h.release());
 }

@@ -1925,7 +1909,7 @@ __tree<_Tp, _Compare, _Allocator>::__node_insert_unique(__node_pointer __nd)
    bool __inserted = false;
    if (__child == nullptr)
    {
-        __insert_node_at(__parent, __child, static_cast<__node_base_pointer>(__nd));
+        __insert_node_at(__parent, __child, __nd);
        __r = __nd;
        __inserted = true;
    }
@@ -1942,7 +1926,7 @@ __tree<_Tp, _Compare, _Allocator>::__node_insert_unique(const_iterator __p,
    __node_pointer __r = static_cast<__node_pointer>(__child);
    if (__child == nullptr)
    {
-        __insert_node_at(__parent, __child, static_cast<__node_base_pointer>(__nd));
+        __insert_node_at(__parent, __child, __nd);
        __r = __nd;
    }
    return iterator(__r);
@@ -1954,7 +1938,7 @@ __tree<_Tp, _Compare, _Allocator>::__node_insert_multi(__node_pointer __nd)
 {
    __node_base_pointer __parent;
    __node_base_pointer& __child = __find_leaf_high(__parent, __nd->__value_);
-    __insert_node_at(__parent, __child, static_cast<__node_base_pointer>(__nd));
+    __insert_node_at(__parent, __child, __nd);
    return iterator(__nd);
 }

@@ -1965,7 +1949,7 @@ __tree<_Tp, _Compare, _Allocator>::__node_insert_multi(const_iterator __p,
 {
    __node_base_pointer __parent;
    __node_base_pointer& __child = __find_leaf(__p, __parent, __nd->__value_);
-    __insert_node_at(__parent, __child, static_cast<__node_base_pointer>(__nd));
+    __insert_node_at(__parent, __child, __nd);
    return iterator(__nd);
 }

@@ -1973,7 +1957,7 @@ template <class _Tp, class _Compare, class _Allocator>
 typename __tree<_Tp, _Compare, _Allocator>::iterator
 __tree<_Tp, _Compare, _Allocator>::erase(const_iterator __p)
 {
-    __node_pointer __np = __p.__ptr_;
+    __node_pointer __np = const_cast<__node_pointer>(__p.__ptr_);
    iterator __r(__np);
    ++__r;
    if (__begin_node() == __np)
@@ -1993,7 +1977,7 @@ __tree<_Tp, _Compare, _Allocator>::erase(const_iterator __f, const_iterator __l)
 {
    while (__f != __l)
        __f = erase(__f);
-    return iterator(__l.__ptr_);
+    return iterator(const_cast<__node_pointer>(__l.__ptr_));
 }

 template <class _Tp, class _Compare, class _Allocator>
@@ -2280,7 +2264,7 @@ template <class _Tp, class _Compare, class _Allocator>
 typename __tree<_Tp, _Compare, _Allocator>::__node_holder
 __tree<_Tp, _Compare, _Allocator>::remove(const_iterator __p) _NOEXCEPT
 {
-    __node_pointer __np = __p.__ptr_;
+    __node_pointer __np = const_cast<__node_pointer>(__p.__ptr_);
    if (__begin_node() == __np)
    {
        if (__np->__right_ != nullptr)
--- a/include/__tuple
+++ b/include/__tuple
@@ -27,46 +27,46 @@

 _LIBCPP_BEGIN_NAMESPACE_STD

-template <class _Tp> class _LIBCPP_TYPE_VIS_ONLY tuple_size;
+template <class _Tp> class _LIBCPP_TYPE_VIS tuple_size;

 template <class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY tuple_size<const _Tp>
+class _LIBCPP_TYPE_VIS tuple_size<const _Tp>
    : public tuple_size<_Tp> {};

 template <class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY tuple_size<volatile _Tp>
+class _LIBCPP_TYPE_VIS tuple_size<volatile _Tp>
    : public tuple_size<_Tp> {};

 template <class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY tuple_size<const volatile _Tp>
+class _LIBCPP_TYPE_VIS tuple_size<const volatile _Tp>
    : public tuple_size<_Tp> {};

-template <size_t _Ip, class _Tp> class _LIBCPP_TYPE_VIS_ONLY tuple_element;
+template <size_t _Ip, class _Tp> class _LIBCPP_TYPE_VIS tuple_element;

 template <size_t _Ip, class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, const _Tp>
+class _LIBCPP_TYPE_VIS tuple_element<_Ip, const _Tp>
 {
 public:
    typedef typename add_const<typename tuple_element<_Ip, _Tp>::type>::type type;
 };

 template <size_t _Ip, class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, volatile _Tp>
+class _LIBCPP_TYPE_VIS tuple_element<_Ip, volatile _Tp>
 {
 public:
    typedef typename add_volatile<typename tuple_element<_Ip, _Tp>::type>::type type;
 };

 template <size_t _Ip, class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, const volatile _Tp>
+class _LIBCPP_TYPE_VIS tuple_element<_Ip, const volatile _Tp>
 {
 public:
    typedef typename add_cv<typename tuple_element<_Ip, _Tp>::type>::type type;
 };

-template <class ..._Tp> class _LIBCPP_TYPE_VIS_ONLY tuple;
-template <class _T1, class _T2> struct _LIBCPP_TYPE_VIS_ONLY pair;
-template <class _Tp, size_t _Size> struct _LIBCPP_TYPE_VIS_ONLY array;
+template <class ..._Tp> class _LIBCPP_TYPE_VIS tuple;
+template <class _T1, class _T2> struct _LIBCPP_TYPE_VIS pair;
+template <class _Tp, size_t _Size> struct _LIBCPP_TYPE_VIS array;

 template <class _Tp> struct __tuple_like : false_type {};

@@ -79,47 +79,47 @@ template <class _T1, class _T2> struct __tuple_like<pair<_T1, _T2> > : true_type
 template <class _Tp, size_t _Size> struct __tuple_like<array<_Tp, _Size> > : true_type {};

 template <size_t _Ip, class ..._Tp>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+_LIBCPP_INLINE_VISIBILITY
 typename tuple_element<_Ip, tuple<_Tp...> >::type&
 get(tuple<_Tp...>&) _NOEXCEPT;

 template <size_t _Ip, class ..._Tp>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+_LIBCPP_INLINE_VISIBILITY
 const typename tuple_element<_Ip, tuple<_Tp...> >::type&
 get(const tuple<_Tp...>&) _NOEXCEPT;

 template <size_t _Ip, class ..._Tp>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+_LIBCPP_INLINE_VISIBILITY
 typename tuple_element<_Ip, tuple<_Tp...> >::type&&
 get(tuple<_Tp...>&&) _NOEXCEPT;

 template <size_t _Ip, class _T1, class _T2>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+_LIBCPP_INLINE_VISIBILITY
 typename tuple_element<_Ip, pair<_T1, _T2> >::type&
 get(pair<_T1, _T2>&) _NOEXCEPT;

 template <size_t _Ip, class _T1, class _T2>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+_LIBCPP_INLINE_VISIBILITY
 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
 get(const pair<_T1, _T2>&) _NOEXCEPT;

 template <size_t _Ip, class _T1, class _T2>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+_LIBCPP_INLINE_VISIBILITY
 typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
 get(pair<_T1, _T2>&&) _NOEXCEPT;

 template <size_t _Ip, class _Tp, size_t _Size>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+_LIBCPP_INLINE_VISIBILITY
 _Tp&
 get(array<_Tp, _Size>&) _NOEXCEPT;

 template <size_t _Ip, class _Tp, size_t _Size>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+_LIBCPP_INLINE_VISIBILITY
 const _Tp&
 get(const array<_Tp, _Size>&) _NOEXCEPT;

 template <size_t _Ip, class _Tp, size_t _Size>
-_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+_LIBCPP_INLINE_VISIBILITY
 _Tp&&
 get(array<_Tp, _Size>&&) _NOEXCEPT;

@@ -154,7 +154,7 @@ struct __make_tuple_indices
 template <class ..._Tp> struct __tuple_types {};

 template <size_t _Ip>
-class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, __tuple_types<> >
+class _LIBCPP_TYPE_VIS tuple_element<_Ip, __tuple_types<> >
 {
 public:
    static_assert(_Ip == 0, "tuple_element index out of range");
@@ -162,21 +162,21 @@ public:
 };

 template <class _Hp, class ..._Tp>
-class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, __tuple_types<_Hp, _Tp...> >
+class _LIBCPP_TYPE_VIS tuple_element<0, __tuple_types<_Hp, _Tp...> >
 {
 public:
    typedef _Hp type;
 };

 template <size_t _Ip, class _Hp, class ..._Tp>
-class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, __tuple_types<_Hp, _Tp...> >
+class _LIBCPP_TYPE_VIS tuple_element<_Ip, __tuple_types<_Hp, _Tp...> >
 {
 public:
    typedef typename tuple_element<_Ip-1, __tuple_types<_Tp...> >::type type;
 };

 template <class ..._Tp>
-class _LIBCPP_TYPE_VIS_ONLY tuple_size<__tuple_types<_Tp...> >
+class _LIBCPP_TYPE_VIS tuple_size<__tuple_types<_Tp...> >
    : public integral_constant<size_t, sizeof...(_Tp)>
 {
 };
--- a/include/__tuple_03
+++ b/include/__tuple_03
@@ -19,8 +19,8 @@

 _LIBCPP_BEGIN_NAMESPACE_STD

-template <class _Tp> class _LIBCPP_TYPE_VIS_ONLY tuple_size;
-template <size_t _Ip, class _Tp> class _LIBCPP_TYPE_VIS_ONLY tuple_element;
+template <class _Tp> class _LIBCPP_TYPE_VIS tuple_size;
+template <size_t _Ip, class _Tp> class _LIBCPP_TYPE_VIS tuple_element;

 _LIBCPP_END_NAMESPACE_STD

--- a/include/__undef_min_max
+++ b/include/__undef_min_max
@@ -9,21 +9,11 @@
 //===----------------------------------------------------------------------===//

 #ifdef min
-#if defined(_MSC_VER) && ! defined(__clang__)
-_LIBCPP_WARNING("macro min is incompatible with C++.  Try #define NOMINMAX "
-                "before any Windows header. #undefing min")
-#else
 #warning: macro min is incompatible with C++.  #undefing min
-#endif
 #undef min
 #endif

 #ifdef max
-#if defined(_MSC_VER) && ! defined(__clang__)
-_LIBCPP_WARNING("macro max is incompatible with C++.  Try #define NOMINMAX "
-                "before any Windows header. #undefing max")
-#else
 #warning: macro max is incompatible with C++.  #undefing max
-#endif
 #undef max
 #endif
--- a/include/algorithm
+++ b/include/algorithm
@@ -87,63 +87,30 @@ template <class InputIterator1, class InputIterator2>
    pair<InputIterator1, InputIterator2>
    mismatch(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2);

-template <class InputIterator1, class InputIterator2>
-    pair<InputIterator1, InputIterator2>
-    mismatch(InputIterator1 first1, InputIterator1 last1, 
-             InputIterator2 first2, InputIterator2 last2); // **C++14**
-
 template <class InputIterator1, class InputIterator2, class BinaryPredicate>
    pair<InputIterator1, InputIterator2>
    mismatch(InputIterator1 first1, InputIterator1 last1,
             InputIterator2 first2, BinaryPredicate pred);

-template <class InputIterator1, class InputIterator2, class BinaryPredicate>
-    pair<InputIterator1, InputIterator2>
-    mismatch(InputIterator1 first1, InputIterator1 last1,
-             InputIterator2 first2, InputIterator2 last2,
-             BinaryPredicate pred); // **C++14**
-
 template <class InputIterator1, class InputIterator2>
    bool
    equal(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2);

-template <class InputIterator1, class InputIterator2>
-    bool
-    equal(InputIterator1 first1, InputIterator1 last1, 
-          InputIterator2 first2, InputIterator2 last2); // **C++14**
-
 template <class InputIterator1, class InputIterator2, class BinaryPredicate>
    bool
    equal(InputIterator1 first1, InputIterator1 last1,
          InputIterator2 first2, BinaryPredicate pred);

-template <class InputIterator1, class InputIterator2, class BinaryPredicate>
-    bool
-    equal(InputIterator1 first1, InputIterator1 last1,
-          InputIterator2 first2, InputIterator2 last2,
-          BinaryPredicate pred); // **C++14**
-
 template<class ForwardIterator1, class ForwardIterator2>
    bool
    is_permutation(ForwardIterator1 first1, ForwardIterator1 last1,
                   ForwardIterator2 first2);

-template<class ForwardIterator1, class ForwardIterator2>
-    bool
-    is_permutation(ForwardIterator1 first1, ForwardIterator1 last1,
-                   ForwardIterator2 first2, ForwardIterator2 last2); // **C++14**
-
 template<class ForwardIterator1, class ForwardIterator2, class BinaryPredicate>
    bool
    is_permutation(ForwardIterator1 first1, ForwardIterator1 last1,
                   ForwardIterator2 first2, BinaryPredicate pred);

-template<class ForwardIterator1, class ForwardIterator2, class BinaryPredicate>
-    bool
-    is_permutation(ForwardIterator1 first1, ForwardIterator1 last1,
-                   ForwardIterator2 first2, ForwardIterator2 last2,
-                   BinaryPredicate pred);  // **C++14**
-
 template <class ForwardIterator1, class ForwardIterator2>
    ForwardIterator1
    search(ForwardIterator1 first1, ForwardIterator1 last1,
@@ -628,13 +595,6 @@ template <class BidirectionalIterator, class Compare>
 #include <iterator>
 #include <cstddef>

-#if defined(__IBMCPP__)
-#include "support/ibm/support.h"
-#endif
-#if defined(_LIBCPP_MSVCRT) || defined(__MINGW32__)
-#include "support/win32/support.h"
-#endif
-
 #include <__undef_min_max>

 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -717,7 +677,7 @@ public:
    bool operator()(const _T1& __x, const _T2& __y) {return !__p_(__x, __y);}
 };

-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2

 template <class _Compare>
 struct __debug_less
@@ -734,7 +694,7 @@ struct __debug_less
    }
 };

-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2

 // Precondition:  __x != 0
 inline _LIBCPP_INLINE_VISIBILITY
@@ -832,7 +792,7 @@ for_each(_InputIterator __first, _InputIterator __last, _Function __f)
 {
    for (; __first != __last; ++__first)
        __f(*__first);
-    return _VSTD::move(__f);  // explicitly moved for (emulated) C++03
+    return _VSTD::move(__f);
 }

 // find
@@ -1127,32 +1087,6 @@ mismatch(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __fi
    return _VSTD::mismatch(__first1, __last1, __first2, __equal_to<__v1, __v2>());
 }

-#if _LIBCPP_STD_VER > 11
-template <class _InputIterator1, class _InputIterator2, class _BinaryPredicate>
-inline _LIBCPP_INLINE_VISIBILITY
-pair<_InputIterator1, _InputIterator2>
-mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
-         _InputIterator2 __first2, _InputIterator2 __last2,
-         _BinaryPredicate __pred)
-{
-    for (; __first1 != __last1 && __first2 != __last2; ++__first1, ++__first2)
-        if (!__pred(*__first1, *__first2))
-            break;
-    return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
-}
-
-template <class _InputIterator1, class _InputIterator2>
-inline _LIBCPP_INLINE_VISIBILITY
-pair<_InputIterator1, _InputIterator2>
-mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
-         _InputIterator2 __first2, _InputIterator2 __last2)
-{
-    typedef typename iterator_traits<_InputIterator1>::value_type __v1;
-    typedef typename iterator_traits<_InputIterator2>::value_type __v2;
-    return _VSTD::mismatch(__first1, __last1, __first2, __last2, __equal_to<__v1, __v2>());
-}
-#endif
-
 // equal

 template <class _InputIterator1, class _InputIterator2, class _BinaryPredicate>
@@ -1176,60 +1110,6 @@ equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first
    return _VSTD::equal(__first1, __last1, __first2, __equal_to<__v1, __v2>());
 }

-#if _LIBCPP_STD_VER > 11
-template <class _BinaryPredicate, class _InputIterator1, class _InputIterator2>
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-__equal(_InputIterator1 __first1, _InputIterator1 __last1, 
-        _InputIterator2 __first2, _InputIterator2 __last2, _BinaryPredicate __pred,
-        input_iterator_tag, input_iterator_tag )
-{
-    for (; __first1 != __last1 && __first2 != __last2; ++__first1, ++__first2)
-        if (!__pred(*__first1, *__first2))
-            return false;
-    return __first1 == __last1 && __first2 == __last2;
-}
-
-template <class _BinaryPredicate, class _RandomAccessIterator1, class _RandomAccessIterator2>
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-__equal(_RandomAccessIterator1 __first1, _RandomAccessIterator1 __last1, 
-        _RandomAccessIterator2 __first2, _RandomAccessIterator2 __last2, _BinaryPredicate __pred, 
-      random_access_iterator_tag, random_access_iterator_tag )
-{
-    if ( _VSTD::distance(__first1, __last1) != _VSTD::distance(__first2, __last2))
-        return false;
-    return _VSTD::equal<_RandomAccessIterator1, _RandomAccessIterator2,
-                        typename add_lvalue_reference<_BinaryPredicate>::type>
-                       (__first1, __last1, __first2, __pred );
-}
-
-template <class _InputIterator1, class _InputIterator2, class _BinaryPredicate>
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-equal(_InputIterator1 __first1, _InputIterator1 __last1, 
-      _InputIterator2 __first2, _InputIterator2 __last2, _BinaryPredicate __pred )
-{
-    return _VSTD::__equal<typename add_lvalue_reference<_BinaryPredicate>::type>
-       (__first1, __last1, __first2, __last2, __pred, 
-        typename iterator_traits<_InputIterator1>::iterator_category(),
-        typename iterator_traits<_InputIterator2>::iterator_category());
-}
-
-template <class _InputIterator1, class _InputIterator2>
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-equal(_InputIterator1 __first1, _InputIterator1 __last1, 
-      _InputIterator2 __first2, _InputIterator2 __last2)
-{
-    typedef typename iterator_traits<_InputIterator1>::value_type __v1;
-    typedef typename iterator_traits<_InputIterator2>::value_type __v2;
-    return _VSTD::__equal(__first1, __last1, __first2, __last2, __equal_to<__v1, __v2>(),
-        typename iterator_traits<_InputIterator1>::iterator_category(),
-        typename iterator_traits<_InputIterator2>::iterator_category());
-}
-#endif
-
 // is_permutation

 template<class _ForwardIterator1, class _ForwardIterator2, class _BinaryPredicate>
@@ -1289,100 +1169,6 @@ is_permutation(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
    return _VSTD::is_permutation(__first1, __last1, __first2, __equal_to<__v1, __v2>());
 }

-#if _LIBCPP_STD_VER > 11
-template<class _BinaryPredicate, class _ForwardIterator1, class _ForwardIterator2>
-bool
-__is_permutation(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
-                 _ForwardIterator2 __first2, _ForwardIterator2 __last2, 
-                 _BinaryPredicate __pred,
-                 forward_iterator_tag, forward_iterator_tag )
-{
-    // shorten sequences as much as possible by lopping of any equal parts
-    for (; __first1 != __last1 && __first2 != __last2; ++__first1, ++__first2)
-        if (!__pred(*__first1, *__first2))
-            goto __not_done;
-    return __first1 == __last1 && __first2 == __last2;
-__not_done:
-    // __first1 != __last1 && __first2 != __last2 && *__first1 != *__first2
-    typedef typename iterator_traits<_ForwardIterator1>::difference_type _D1;
-    _D1 __l1 = _VSTD::distance(__first1, __last1);
-
-    typedef typename iterator_traits<_ForwardIterator2>::difference_type _D2;
-    _D2 __l2 = _VSTD::distance(__first2, __last2);
-    if (__l1 != __l2)
-        return false;
-
-    // For each element in [f1, l1) see if there are the same number of
-    //    equal elements in [f2, l2)
-    for (_ForwardIterator1 __i = __first1; __i != __last1; ++__i)
-    {
-        // Have we already counted the number of *__i in [f1, l1)?
-        for (_ForwardIterator1 __j = __first1; __j != __i; ++__j)
-            if (__pred(*__j, *__i))
-                goto __next_iter;
-        {
-            // Count number of *__i in [f2, l2)
-            _D1 __c2 = 0;
-            for (_ForwardIterator2 __j = __first2; __j != __last2; ++__j)
-                if (__pred(*__i, *__j))
-                    ++__c2;
-            if (__c2 == 0)
-                return false;
-            // Count number of *__i in [__i, l1) (we can start with 1)
-            _D1 __c1 = 1;
-            for (_ForwardIterator1 __j = _VSTD::next(__i); __j != __last1; ++__j)
-                if (__pred(*__i, *__j))
-                    ++__c1;
-            if (__c1 != __c2)
-                return false;
-        }
-__next_iter:;
-    }
-    return true;
-}
-
-template<class _BinaryPredicate, class _RandomAccessIterator1, class _RandomAccessIterator2>
-bool
-__is_permutation(_RandomAccessIterator1 __first1, _RandomAccessIterator2 __last1,
-               _RandomAccessIterator1 __first2, _RandomAccessIterator2 __last2, 
-               _BinaryPredicate __pred,
-               random_access_iterator_tag, random_access_iterator_tag )
-{
-    if ( _VSTD::distance(__first1, __last1) != _VSTD::distance(__first2, __last2))
-        return false;
-    return _VSTD::is_permutation<_RandomAccessIterator1, _RandomAccessIterator2,
-                                 typename add_lvalue_reference<_BinaryPredicate>::type>
-                                (__first1, __last1, __first2, __pred );
-}
-
-template<class _ForwardIterator1, class _ForwardIterator2, class _BinaryPredicate>
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-is_permutation(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
-               _ForwardIterator2 __first2, _ForwardIterator2 __last2,
-               _BinaryPredicate __pred )
-{
-    return _VSTD::__is_permutation<typename add_lvalue_reference<_BinaryPredicate>::type>
-       (__first1, __last1, __first2, __last2, __pred,
-        typename iterator_traits<_ForwardIterator1>::iterator_category(),
-        typename iterator_traits<_ForwardIterator2>::iterator_category());
-}
-
-template<class _ForwardIterator1, class _ForwardIterator2>
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-is_permutation(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
-               _ForwardIterator2 __first2, _ForwardIterator2 __last2)
-{
-    typedef typename iterator_traits<_ForwardIterator1>::value_type __v1;
-    typedef typename iterator_traits<_ForwardIterator2>::value_type __v2;
-    return _VSTD::__is_permutation(__first1, __last1, __first2, __last2,
-        __equal_to<__v1, __v2>(),
-        typename iterator_traits<_ForwardIterator1>::iterator_category(),
-        typename iterator_traits<_ForwardIterator2>::iterator_category());
-}
-#endif
-
 // search

 template <class _BinaryPredicate, class _ForwardIterator1, class _ForwardIterator2>
@@ -1695,8 +1481,6 @@ __unwrap_iter(move_iterator<_Tp*> __i)
    return __i.base();
 }

-#if _LIBCPP_DEBUG_LEVEL < 2
-
 template <class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY
 typename enable_if
@@ -1709,8 +1493,6 @@ __unwrap_iter(__wrap_iter<_Tp*> __i)
    return __i.base();
 }

-#endif  // _LIBCPP_DEBUG_LEVEL < 2
-
 template <class _InputIterator, class _OutputIterator>
 inline _LIBCPP_INLINE_VISIBILITY
 _OutputIterator
@@ -1998,23 +1780,17 @@ replace_copy_if(_InputIterator __first, _InputIterator __last, _OutputIterator _
 template <class _OutputIterator, class _Size, class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY
 _OutputIterator
-__fill_n(_OutputIterator __first, _Size __n, const _Tp& __value_)
+__fill_n(_OutputIterator __first, _Size __n, const _Tp& __value_, false_type)
 {
    for (; __n > 0; ++__first, --__n)
        *__first = __value_;
    return __first;
 }

-template <class _Tp, class _Size, class _Up>
+template <class _OutputIterator, class _Size, class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY
-typename enable_if
-<
-    is_integral<_Tp>::value && sizeof(_Tp) == 1 &&
-    !is_same<_Tp, bool>::value &&
-    is_integral<_Up>::value && sizeof(_Up) == 1,
-    _Tp*
->::type
-__fill_n(_Tp* __first, _Size __n,_Up __value_)
+_OutputIterator
+__fill_n(_OutputIterator __first, _Size __n, const _Tp& __value_, true_type)
 {
    if (__n > 0)
        _VSTD::memset(__first, (unsigned char)__value_, (size_t)(__n));
@@ -2026,7 +1802,10 @@ inline _LIBCPP_INLINE_VISIBILITY
 _OutputIterator
 fill_n(_OutputIterator __first, _Size __n, const _Tp& __value_)
 {
-   return _VSTD::__fill_n(__first, __n, __value_);
+   return _VSTD::__fill_n(__first, __n, __value_, integral_constant<bool,
+                                              is_pointer<_OutputIterator>::value &&
+                                              is_trivially_copy_assignable<_Tp>::value     &&
+                                              sizeof(_Tp) == 1>());
 }

 // fill
@@ -2975,11 +2754,11 @@ uniform_int_distribution<_IntType>::operator()(_URNG& __g, const param_type& __p
    return static_cast<result_type>(__u + __p.a());
 }

-class _LIBCPP_TYPE_VIS __rs_default;
+class __rs_default;

-_LIBCPP_FUNC_VIS __rs_default __rs_get();
+__rs_default __rs_get();

-class _LIBCPP_TYPE_VIS __rs_default
+class __rs_default
 {
    static unsigned __c_;

@@ -2998,10 +2777,10 @@ public:
    static _LIBCPP_CONSTEXPR result_type min() {return _Min;}
    static _LIBCPP_CONSTEXPR result_type max() {return _Max;}

-    friend _LIBCPP_FUNC_VIS __rs_default __rs_get();
+    friend __rs_default __rs_get();
 };

-_LIBCPP_FUNC_VIS __rs_default __rs_get();
+__rs_default __rs_get();

 template <class _RandomAccessIterator>
 void
@@ -3956,14 +3735,14 @@ inline _LIBCPP_INLINE_VISIBILITY
 void
 sort(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    __sort<_Comp_ref>(__first, __last, __c);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    __sort<_Comp_ref>(__first, __last, __comp);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _RandomAccessIterator>
@@ -3999,46 +3778,46 @@ sort(__wrap_iter<_Tp*> __first, __wrap_iter<_Tp*> __last, _Compare __comp)
    _VSTD::sort<_Tp*, _Comp_ref>(__first.base(), __last.base(), __comp);
 }

-#ifdef _LIBCPP_MSVC
+#ifdef _MSC_VER
 #pragma warning( push )
 #pragma warning( disable: 4231)
-#endif // _LIBCPP_MSVC
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS void __sort<__less<char>&, char*>(char*, char*, __less<char>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS void __sort<__less<wchar_t>&, wchar_t*>(wchar_t*, wchar_t*, __less<wchar_t>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS void __sort<__less<signed char>&, signed char*>(signed char*, signed char*, __less<signed char>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS void __sort<__less<unsigned char>&, unsigned char*>(unsigned char*, unsigned char*, __less<unsigned char>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS void __sort<__less<short>&, short*>(short*, short*, __less<short>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS void __sort<__less<unsigned short>&, unsigned short*>(unsigned short*, unsigned short*, __less<unsigned short>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS void __sort<__less<int>&, int*>(int*, int*, __less<int>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS void __sort<__less<unsigned>&, unsigned*>(unsigned*, unsigned*, __less<unsigned>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS void __sort<__less<long>&, long*>(long*, long*, __less<long>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS void __sort<__less<unsigned long>&, unsigned long*>(unsigned long*, unsigned long*, __less<unsigned long>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS void __sort<__less<long long>&, long long*>(long long*, long long*, __less<long long>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS void __sort<__less<unsigned long long>&, unsigned long long*>(unsigned long long*, unsigned long long*, __less<unsigned long long>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS void __sort<__less<float>&, float*>(float*, float*, __less<float>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS void __sort<__less<double>&, double*>(double*, double*, __less<double>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS void __sort<__less<long double>&, long double*>(long double*, long double*, __less<long double>&))
+#endif // _MSC_VER
+_LIBCPP_EXTERN_TEMPLATE(void __sort<__less<char>&, char*>(char*, char*, __less<char>&))
+_LIBCPP_EXTERN_TEMPLATE(void __sort<__less<wchar_t>&, wchar_t*>(wchar_t*, wchar_t*, __less<wchar_t>&))
+_LIBCPP_EXTERN_TEMPLATE(void __sort<__less<signed char>&, signed char*>(signed char*, signed char*, __less<signed char>&))
+_LIBCPP_EXTERN_TEMPLATE(void __sort<__less<unsigned char>&, unsigned char*>(unsigned char*, unsigned char*, __less<unsigned char>&))
+_LIBCPP_EXTERN_TEMPLATE(void __sort<__less<short>&, short*>(short*, short*, __less<short>&))
+_LIBCPP_EXTERN_TEMPLATE(void __sort<__less<unsigned short>&, unsigned short*>(unsigned short*, unsigned short*, __less<unsigned short>&))
+_LIBCPP_EXTERN_TEMPLATE(void __sort<__less<int>&, int*>(int*, int*, __less<int>&))
+_LIBCPP_EXTERN_TEMPLATE(void __sort<__less<unsigned>&, unsigned*>(unsigned*, unsigned*, __less<unsigned>&))
+_LIBCPP_EXTERN_TEMPLATE(void __sort<__less<long>&, long*>(long*, long*, __less<long>&))
+_LIBCPP_EXTERN_TEMPLATE(void __sort<__less<unsigned long>&, unsigned long*>(unsigned long*, unsigned long*, __less<unsigned long>&))
+_LIBCPP_EXTERN_TEMPLATE(void __sort<__less<long long>&, long long*>(long long*, long long*, __less<long long>&))
+_LIBCPP_EXTERN_TEMPLATE(void __sort<__less<unsigned long long>&, unsigned long long*>(unsigned long long*, unsigned long long*, __less<unsigned long long>&))
+_LIBCPP_EXTERN_TEMPLATE(void __sort<__less<float>&, float*>(float*, float*, __less<float>&))
+_LIBCPP_EXTERN_TEMPLATE(void __sort<__less<double>&, double*>(double*, double*, __less<double>&))
+_LIBCPP_EXTERN_TEMPLATE(void __sort<__less<long double>&, long double*>(long double*, long double*, __less<long double>&))

-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<char>&, char*>(char*, char*, __less<char>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<wchar_t>&, wchar_t*>(wchar_t*, wchar_t*, __less<wchar_t>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<signed char>&, signed char*>(signed char*, signed char*, __less<signed char>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<unsigned char>&, unsigned char*>(unsigned char*, unsigned char*, __less<unsigned char>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<short>&, short*>(short*, short*, __less<short>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<unsigned short>&, unsigned short*>(unsigned short*, unsigned short*, __less<unsigned short>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<int>&, int*>(int*, int*, __less<int>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<unsigned>&, unsigned*>(unsigned*, unsigned*, __less<unsigned>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<long>&, long*>(long*, long*, __less<long>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<unsigned long>&, unsigned long*>(unsigned long*, unsigned long*, __less<unsigned long>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<long long>&, long long*>(long long*, long long*, __less<long long>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<unsigned long long>&, unsigned long long*>(unsigned long long*, unsigned long long*, __less<unsigned long long>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<float>&, float*>(float*, float*, __less<float>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<double>&, double*>(double*, double*, __less<double>&))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS bool __insertion_sort_incomplete<__less<long double>&, long double*>(long double*, long double*, __less<long double>&))
+_LIBCPP_EXTERN_TEMPLATE(bool __insertion_sort_incomplete<__less<char>&, char*>(char*, char*, __less<char>&))
+_LIBCPP_EXTERN_TEMPLATE(bool __insertion_sort_incomplete<__less<wchar_t>&, wchar_t*>(wchar_t*, wchar_t*, __less<wchar_t>&))
+_LIBCPP_EXTERN_TEMPLATE(bool __insertion_sort_incomplete<__less<signed char>&, signed char*>(signed char*, signed char*, __less<signed char>&))
+_LIBCPP_EXTERN_TEMPLATE(bool __insertion_sort_incomplete<__less<unsigned char>&, unsigned char*>(unsigned char*, unsigned char*, __less<unsigned char>&))
+_LIBCPP_EXTERN_TEMPLATE(bool __insertion_sort_incomplete<__less<short>&, short*>(short*, short*, __less<short>&))
+_LIBCPP_EXTERN_TEMPLATE(bool __insertion_sort_incomplete<__less<unsigned short>&, unsigned short*>(unsigned short*, unsigned short*, __less<unsigned short>&))
+_LIBCPP_EXTERN_TEMPLATE(bool __insertion_sort_incomplete<__less<int>&, int*>(int*, int*, __less<int>&))
+_LIBCPP_EXTERN_TEMPLATE(bool __insertion_sort_incomplete<__less<unsigned>&, unsigned*>(unsigned*, unsigned*, __less<unsigned>&))
+_LIBCPP_EXTERN_TEMPLATE(bool __insertion_sort_incomplete<__less<long>&, long*>(long*, long*, __less<long>&))
+_LIBCPP_EXTERN_TEMPLATE(bool __insertion_sort_incomplete<__less<unsigned long>&, unsigned long*>(unsigned long*, unsigned long*, __less<unsigned long>&))
+_LIBCPP_EXTERN_TEMPLATE(bool __insertion_sort_incomplete<__less<long long>&, long long*>(long long*, long long*, __less<long long>&))
+_LIBCPP_EXTERN_TEMPLATE(bool __insertion_sort_incomplete<__less<unsigned long long>&, unsigned long long*>(unsigned long long*, unsigned long long*, __less<unsigned long long>&))
+_LIBCPP_EXTERN_TEMPLATE(bool __insertion_sort_incomplete<__less<float>&, float*>(float*, float*, __less<float>&))
+_LIBCPP_EXTERN_TEMPLATE(bool __insertion_sort_incomplete<__less<double>&, double*>(double*, double*, __less<double>&))
+_LIBCPP_EXTERN_TEMPLATE(bool __insertion_sort_incomplete<__less<long double>&, long double*>(long double*, long double*, __less<long double>&))

-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS unsigned __sort5<__less<long double>&, long double*>(long double*, long double*, long double*, long double*, long double*, __less<long double>&))
-#ifdef _LIBCPP_MSVC
+_LIBCPP_EXTERN_TEMPLATE(unsigned __sort5<__less<long double>&, long double*>(long double*, long double*, long double*, long double*, long double*, __less<long double>&))
+#ifdef _MSC_VER
 #pragma warning( pop )
-#endif  // _LIBCPP_MSVC
+#endif  // _MSC_VER

 // lower_bound

@@ -4069,14 +3848,14 @@ inline _LIBCPP_INLINE_VISIBILITY
 _ForwardIterator
 lower_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    return __lower_bound<_Comp_ref>(__first, __last, __value_, __c);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    return __lower_bound<_Comp_ref>(__first, __last, __value_, __comp);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _ForwardIterator, class _Tp>
@@ -4117,14 +3896,14 @@ inline _LIBCPP_INLINE_VISIBILITY
 _ForwardIterator
 upper_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    return __upper_bound<_Comp_ref>(__first, __last, __value_, __c);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    return __upper_bound<_Comp_ref>(__first, __last, __value_, __comp);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _ForwardIterator, class _Tp>
@@ -4177,14 +3956,14 @@ inline _LIBCPP_INLINE_VISIBILITY
 pair<_ForwardIterator, _ForwardIterator>
 equal_range(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    return __equal_range<_Comp_ref>(__first, __last, __value_, __c);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    return __equal_range<_Comp_ref>(__first, __last, __value_, __comp);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _ForwardIterator, class _Tp>
@@ -4212,14 +3991,14 @@ inline _LIBCPP_INLINE_VISIBILITY
 bool
 binary_search(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value_, _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    return __binary_search<_Comp_ref>(__first, __last, __value_, __c);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    return __binary_search<_Comp_ref>(__first, __last, __value_, __comp);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _ForwardIterator, class _Tp>
@@ -4262,14 +4041,14 @@ _OutputIterator
 merge(_InputIterator1 __first1, _InputIterator1 __last1,
      _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    return _VSTD::__merge<_Comp_ref>(__first1, __last1, __first2, __last2, __result, __c);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    return _VSTD::__merge<_Comp_ref>(__first1, __last1, __first2, __last2, __result, __comp);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _InputIterator1, class _InputIterator2, class _OutputIterator>
@@ -4436,16 +4215,16 @@ inplace_merge(_BidirectionalIterator __first, _BidirectionalIterator __middle, _
        __buf = _VSTD::get_temporary_buffer<value_type>(__buf_size);
        __h.reset(__buf.first);
    }
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    return _VSTD::__inplace_merge<_Comp_ref>(__first, __middle, __last, __c, __len1, __len2,
                                            __buf.first, __buf.second);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    return _VSTD::__inplace_merge<_Comp_ref>(__first, __middle, __last, __comp, __len1, __len2,
                                            __buf.first, __buf.second);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _BidirectionalIterator>
@@ -4647,14 +4426,14 @@ stable_sort(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compar
        __buf = _VSTD::get_temporary_buffer<value_type>(__len);
        __h.reset(__buf.first);
    }
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    __stable_sort<_Comp_ref>(__first, __last, __c, __len, __buf.first, __buf.second);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    __stable_sort<_Comp_ref>(__first, __last, __comp, __len, __buf.first, __buf.second);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _RandomAccessIterator>
@@ -4796,14 +4575,14 @@ inline _LIBCPP_INLINE_VISIBILITY
 void
 push_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    __push_heap_back<_Comp_ref>(__first, __last, __c, __last - __first);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    __push_heap_back<_Comp_ref>(__first, __last, __comp, __last - __first);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _RandomAccessIterator>
@@ -4834,14 +4613,14 @@ inline _LIBCPP_INLINE_VISIBILITY
 void
 pop_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    __pop_heap<_Comp_ref>(__first, __last, __c, __last - __first);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    __pop_heap<_Comp_ref>(__first, __last, __comp, __last - __first);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _RandomAccessIterator>
@@ -4874,14 +4653,14 @@ inline _LIBCPP_INLINE_VISIBILITY
 void
 make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    __make_heap<_Comp_ref>(__first, __last, __c);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    __make_heap<_Comp_ref>(__first, __last, __comp);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _RandomAccessIterator>
@@ -4908,14 +4687,14 @@ inline _LIBCPP_INLINE_VISIBILITY
 void
 sort_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    __sort_heap<_Comp_ref>(__first, __last, __c);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    __sort_heap<_Comp_ref>(__first, __last, __comp);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _RandomAccessIterator>
@@ -4952,14 +4731,14 @@ void
 partial_sort(_RandomAccessIterator __first, _RandomAccessIterator __middle, _RandomAccessIterator __last,
             _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    __partial_sort<_Comp_ref>(__first, __middle, __last, __c);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    __partial_sort<_Comp_ref>(__first, __middle, __last, __comp);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _RandomAccessIterator>
@@ -5002,14 +4781,14 @@ _RandomAccessIterator
 partial_sort_copy(_InputIterator __first, _InputIterator __last,
                  _RandomAccessIterator __result_first, _RandomAccessIterator __result_last, _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    return __partial_sort_copy<_Comp_ref>(__first, __last, __result_first, __result_last, __c);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    return __partial_sort_copy<_Comp_ref>(__first, __last, __result_first, __result_last, __comp);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _InputIterator, class _RandomAccessIterator>
@@ -5216,14 +4995,14 @@ inline _LIBCPP_INLINE_VISIBILITY
 void
 nth_element(_RandomAccessIterator __first, _RandomAccessIterator __nth, _RandomAccessIterator __last, _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    __nth_element<_Comp_ref>(__first, __nth, __last, __c);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    __nth_element<_Comp_ref>(__first, __nth, __last, __comp);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _RandomAccessIterator>
@@ -5257,14 +5036,14 @@ bool
 includes(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2,
         _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    return __includes<_Comp_ref>(__first1, __last1, __first2, __last2, __c);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    return __includes<_Comp_ref>(__first1, __last1, __first2, __last2, __comp);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _InputIterator1, class _InputIterator2>
@@ -5310,14 +5089,14 @@ _OutputIterator
 set_union(_InputIterator1 __first1, _InputIterator1 __last1,
          _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    return __set_union<_Comp_ref>(__first1, __last1, __first2, __last2, __result, __c);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    return __set_union<_Comp_ref>(__first1, __last1, __first2, __last2, __result, __comp);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _InputIterator1, class _InputIterator2, class _OutputIterator>
@@ -5362,14 +5141,14 @@ _OutputIterator
 set_intersection(_InputIterator1 __first1, _InputIterator1 __last1,
                 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    return __set_intersection<_Comp_ref>(__first1, __last1, __first2, __last2, __result, __c);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    return __set_intersection<_Comp_ref>(__first1, __last1, __first2, __last2, __result, __comp);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _InputIterator1, class _InputIterator2, class _OutputIterator>
@@ -5416,14 +5195,14 @@ _OutputIterator
 set_difference(_InputIterator1 __first1, _InputIterator1 __last1,
               _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    return __set_difference<_Comp_ref>(__first1, __last1, __first2, __last2, __result, __c);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    return __set_difference<_Comp_ref>(__first1, __last1, __first2, __last2, __result, __comp);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _InputIterator1, class _InputIterator2, class _OutputIterator>
@@ -5475,14 +5254,14 @@ _OutputIterator
 set_symmetric_difference(_InputIterator1 __first1, _InputIterator1 __last1,
                         _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    return __set_symmetric_difference<_Comp_ref>(__first1, __last1, __first2, __last2, __result, __c);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    return __set_symmetric_difference<_Comp_ref>(__first1, __last1, __first2, __last2, __result, __comp);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _InputIterator1, class _InputIterator2, class _OutputIterator>
@@ -5519,14 +5298,14 @@ bool
 lexicographical_compare(_InputIterator1 __first1, _InputIterator1 __last1,
                        _InputIterator2 __first2, _InputIterator2 __last2, _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    return __lexicographical_compare<_Comp_ref>(__first1, __last1, __first2, __last2, __c);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    return __lexicographical_compare<_Comp_ref>(__first1, __last1, __first2, __last2, __comp);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _InputIterator1, class _InputIterator2>
@@ -5574,14 +5353,14 @@ inline _LIBCPP_INLINE_VISIBILITY
 bool
 next_permutation(_BidirectionalIterator __first, _BidirectionalIterator __last, _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    return __next_permutation<_Comp_ref>(__first, __last, __c);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    return __next_permutation<_Comp_ref>(__first, __last, __comp);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _BidirectionalIterator>
@@ -5627,14 +5406,14 @@ inline _LIBCPP_INLINE_VISIBILITY
 bool
 prev_permutation(_BidirectionalIterator __first, _BidirectionalIterator __last, _Compare __comp)
 {
-#ifdef _LIBCPP_DEBUG
+#ifdef _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<__debug_less<_Compare> >::type _Comp_ref;
    __debug_less<_Compare> __c(__comp);
    return __prev_permutation<_Comp_ref>(__first, __last, __c);
-#else  // _LIBCPP_DEBUG
+#else  // _LIBCPP_DEBUG2
    typedef typename add_lvalue_reference<_Compare>::type _Comp_ref;
    return __prev_permutation<_Comp_ref>(__first, __last, __comp);
-#endif  // _LIBCPP_DEBUG
+#endif  // _LIBCPP_DEBUG2
 }

 template <class _BidirectionalIterator>
--- a/include/array
+++ b/include/array
@@ -59,14 +59,14 @@ struct array

    // element access:
    reference operator[](size_type n);
-    const_reference operator[](size_type n) const; // constexpr in C++14
-    const_reference at(size_type n) const; // constexpr in C++14
+    const_reference operator[](size_type n) const;
+    const_reference at(size_type n) const;
    reference at(size_type n);

    reference front();
-    const_reference front() const; // constexpr in C++14
+    const_reference front() const;
    reference back();
-    const_reference back() const; // constexpr in C++14
+    const_reference back() const;

    T* data() noexcept;
    const T* data() const noexcept;
@@ -92,9 +92,9 @@ template <class T> class tuple_size;
 template <int I, class T> class tuple_element;
 template <class T, size_t N> struct tuple_size<array<T, N>>;
 template <int I, class T, size_t N> struct tuple_element<I, array<T, N>>;
-template <int I, class T, size_t N> T& get(array<T, N>&) noexcept; // constexpr in C++14
-template <int I, class T, size_t N> const T& get(const array<T, N>&) noexcept; // constexpr in C++14
-template <int I, class T, size_t N> T&& get(array<T, N>&&) noexcept; // constexpr in C++14
+template <int I, class T, size_t N> T& get(array<T, N>&) noexcept;
+template <int I, class T, size_t N> const T& get(const array<T, N>&) noexcept;
+template <int I, class T, size_t N> T&& get(array<T, N>&&) noexcept;

 }  // std

@@ -118,7 +118,7 @@ template <int I, class T, size_t N> T&& get(array<T, N>&&) noexcept; // constexp
 _LIBCPP_BEGIN_NAMESPACE_STD

 template <class _Tp, size_t _Size>
-struct _LIBCPP_TYPE_VIS_ONLY array
+struct _LIBCPP_TYPE_VIS array
 {
    // types:
    typedef array __self;
@@ -181,14 +181,14 @@ struct _LIBCPP_TYPE_VIS_ONLY array

    // element access:
    _LIBCPP_INLINE_VISIBILITY reference operator[](size_type __n)             {return __elems_[__n];}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const_reference operator[](size_type __n) const {return __elems_[__n];}
+    _LIBCPP_INLINE_VISIBILITY const_reference operator[](size_type __n) const {return __elems_[__n];}
    reference at(size_type __n);
-    _LIBCPP_CONSTEXPR_AFTER_CXX11 const_reference at(size_type __n) const;
+    const_reference at(size_type __n) const;

    _LIBCPP_INLINE_VISIBILITY reference front()             {return __elems_[0];}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const_reference front() const {return __elems_[0];}
+    _LIBCPP_INLINE_VISIBILITY const_reference front() const {return __elems_[0];}
    _LIBCPP_INLINE_VISIBILITY reference back()              {return __elems_[_Size > 0 ? _Size-1 : 0];}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const_reference back() const  {return __elems_[_Size > 0 ? _Size-1 : 0];}
+    _LIBCPP_INLINE_VISIBILITY const_reference back() const  {return __elems_[_Size > 0 ? _Size-1 : 0];}

    _LIBCPP_INLINE_VISIBILITY
    value_type* data() _NOEXCEPT {return __elems_;}
@@ -210,7 +210,6 @@ array<_Tp, _Size>::at(size_type __n)
 }

 template <class _Tp, size_t _Size>
-_LIBCPP_CONSTEXPR_AFTER_CXX11
 typename array<_Tp, _Size>::const_reference
 array<_Tp, _Size>::at(size_type __n) const
 {
@@ -224,7 +223,7 @@ array<_Tp, _Size>::at(size_type __n) const
 }

 template <class _Tp, size_t _Size>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 bool
 operator==(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
 {
@@ -232,7 +231,7 @@ operator==(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
 }

 template <class _Tp, size_t _Size>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 bool
 operator!=(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
 {
@@ -240,7 +239,7 @@ operator!=(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
 }

 template <class _Tp, size_t _Size>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 bool
 operator<(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
 {
@@ -248,7 +247,7 @@ operator<(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
 }

 template <class _Tp, size_t _Size>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 bool
 operator>(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
 {
@@ -256,7 +255,7 @@ operator>(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
 }

 template <class _Tp, size_t _Size>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 bool
 operator<=(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
 {
@@ -264,7 +263,7 @@ operator<=(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
 }

 template <class _Tp, size_t _Size>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 bool
 operator>=(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
 {
@@ -272,7 +271,7 @@ operator>=(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
 }

 template <class _Tp, size_t _Size>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 typename enable_if
 <
    __is_swappable<_Tp>::value,
@@ -285,54 +284,54 @@ swap(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
 }

 template <class _Tp, size_t _Size>
-class _LIBCPP_TYPE_VIS_ONLY tuple_size<array<_Tp, _Size> >
+class _LIBCPP_TYPE_VIS tuple_size<array<_Tp, _Size> >
    : public integral_constant<size_t, _Size> {};

 template <class _Tp, size_t _Size>
-class _LIBCPP_TYPE_VIS_ONLY tuple_size<const array<_Tp, _Size> >
+class _LIBCPP_TYPE_VIS tuple_size<const array<_Tp, _Size> >
    : public integral_constant<size_t, _Size> {};

 template <size_t _Ip, class _Tp, size_t _Size>
-class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, array<_Tp, _Size> >
+class _LIBCPP_TYPE_VIS tuple_element<_Ip, array<_Tp, _Size> >
 {
 public:
    typedef _Tp type;
 };

 template <size_t _Ip, class _Tp, size_t _Size>
-class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, const array<_Tp, _Size> >
+class _LIBCPP_TYPE_VIS tuple_element<_Ip, const array<_Tp, _Size> >
 {
 public:
    typedef const _Tp type;
 };

 template <size_t _Ip, class _Tp, size_t _Size>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+_LIBCPP_INLINE_VISIBILITY inline
 _Tp&
 get(array<_Tp, _Size>& __a) _NOEXCEPT
 {
    static_assert(_Ip < _Size, "Index out of bounds in std::get<> (std::array)");
-    return __a.__elems_[_Ip];
+    return __a[_Ip];
 }

 template <size_t _Ip, class _Tp, size_t _Size>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+_LIBCPP_INLINE_VISIBILITY inline
 const _Tp&
 get(const array<_Tp, _Size>& __a) _NOEXCEPT
 {
    static_assert(_Ip < _Size, "Index out of bounds in std::get<> (const std::array)");
-    return __a.__elems_[_Ip];
+    return __a[_Ip];
 }

 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

 template <size_t _Ip, class _Tp, size_t _Size>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+_LIBCPP_INLINE_VISIBILITY inline
 _Tp&&
 get(array<_Tp, _Size>&& __a) _NOEXCEPT
 {
    static_assert(_Ip < _Size, "Index out of bounds in std::get<> (std::array &&)");
-    return _VSTD::move(__a.__elems_[_Ip]);
+    return _VSTD::move(__a[_Ip]);
 }

 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
--- a/include/bitset
+++ b/include/bitset
@@ -632,11 +632,11 @@ __bitset<0, 0>::__bitset(unsigned long long) _NOEXCEPT
 {
 }

-template <size_t _Size> class _LIBCPP_TYPE_VIS_ONLY bitset;
-template <size_t _Size> struct _LIBCPP_TYPE_VIS_ONLY hash<bitset<_Size> >;
+template <size_t _Size> class _LIBCPP_TYPE_VIS bitset;
+template <size_t _Size> struct _LIBCPP_TYPE_VIS hash<bitset<_Size> >;

 template <size_t _Size>
-class _LIBCPP_TYPE_VIS_ONLY bitset
+class _LIBCPP_TYPE_VIS bitset
    : private __bitset<_Size == 0 ? 0 : (_Size - 1) / (sizeof(size_t) * CHAR_BIT) + 1, _Size>
 {
 public:
@@ -1060,7 +1060,7 @@ operator^(const bitset<_Size>& __x, const bitset<_Size>& __y) _NOEXCEPT
 }

 template <size_t _Size>
-struct _LIBCPP_TYPE_VIS_ONLY hash<bitset<_Size> >
+struct _LIBCPP_TYPE_VIS hash<bitset<_Size> >
    : public unary_function<bitset<_Size>, size_t>
 {
    _LIBCPP_INLINE_VISIBILITY
--- a/include/cctype
+++ b/include/cctype
@@ -37,9 +37,9 @@ int toupper(int c);

 #include <__config>
 #include <ctype.h>
-#if defined(_LIBCPP_MSVCRT)
+#if defined(_MSC_VER)
 #include "support/win32/support.h"
-#endif // _LIBCPP_MSVCRT
+#endif // _MSC_VER

 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
--- a/include/chrono
+++ b/include/chrono
@@ -111,16 +111,16 @@ private:
    duration d_;  // exposition only

 public:
-    time_point();  // has value "epoch" // constexpr in C++14
-    explicit time_point(const duration& d);  // same as time_point() + d // constexpr in C++14
+    time_point();  // has value "epoch"
+    explicit time_point(const duration& d);  // same as time_point() + d

    // conversions
    template <class Duration2>
-       time_point(const time_point<clock, Duration2>& t); // constexpr in C++14
+       time_point(const time_point<clock, Duration2>& t);

    // observer

-    duration time_since_epoch() const; // constexpr in C++14
+    duration time_since_epoch() const;

    // arithmetic

@@ -194,7 +194,7 @@ template <class Rep1, class Period1, class Rep2, class Period2>
 template <class ToDuration, class Rep, class Period>
  ToDuration duration_cast(const duration<Rep, Period>& d);

-// time_point arithmetic (all constexpr in C++14)
+// time_point arithmetic
 template <class Clock, class Duration1, class Rep2, class Period2>
  time_point<Clock, typename common_type<Duration1, duration<Rep2, Period2>>::type>
  operator+(const time_point<Clock, Duration1>& lhs, const duration<Rep2, Period2>& rhs);
@@ -208,7 +208,7 @@ template <class Clock, class Duration1, class Duration2>
  typename common_type<Duration1, Duration2>::type
  operator-(const time_point<Clock, Duration1>& lhs, const time_point<Clock, Duration2>& rhs);

-// time_point comparisons (all constexpr in C++14)
+// time_point comparisons
 template <class Clock, class Duration1, class Duration2>
   bool operator==(const time_point<Clock, Duration1>& lhs, const time_point<Clock, Duration2>& rhs);
 template <class Clock, class Duration1, class Duration2>
@@ -222,7 +222,7 @@ template <class Clock, class Duration1, class Duration2>
 template <class Clock, class Duration1, class Duration2>
   bool operator>=(const time_point<Clock, Duration1>& lhs, const time_point<Clock, Duration2>& rhs);

-// time_point_cast (constexpr in C++14)
+// time_point_cast

 template <class ToDuration, class Clock, class Duration>
  time_point<Clock, ToDuration> time_point_cast(const time_point<Clock, Duration>& t);
@@ -236,7 +236,7 @@ public:
    typedef duration::rep                    rep;
    typedef duration::period                 period;
    typedef chrono::time_point<system_clock> time_point;
-    static const bool is_steady =            false; // constexpr in C++14
+    static const bool is_steady =            false;

    static time_point now() noexcept;
    static time_t     to_time_t  (const time_point& __t) noexcept;
@@ -250,7 +250,7 @@ public:
    typedef duration::rep                                 rep;
    typedef duration::period                              period;
    typedef chrono::time_point<steady_clock, duration>    time_point;
-    static const bool is_steady =                         true; // constexpr in C++14
+    static const bool is_steady =                         true;

    static time_point now() noexcept;
 };
@@ -259,19 +259,6 @@ typedef steady_clock high_resolution_clock;

 }  // chrono

-constexpr chrono::hours                                 operator "" h(unsigned long long); // C++14
-constexpr chrono::duration<unspecified , ratio<3600,1>> operator "" h(long double); // C++14
-constexpr chrono::minutes                               operator "" min(unsigned long long); // C++14
-constexpr chrono::duration<unspecified , ratio<60,1>>   operator "" min(long double); // C++14
-constexpr chrono::seconds                               operator "" s(unsigned long long); // C++14
-constexpr chrono::duration<unspecified >                operator "" s(long double); // C++14
-constexpr chrono::milliseconds                          operator "" ms(unsigned long long); // C++14
-constexpr chrono::duration<unspecified , milli>         operator "" ms(long double); // C++14
-constexpr chrono::microseconds                          operator "" us(unsigned long long); // C++14
-constexpr chrono::duration<unspecified , micro>         operator "" us(long double); // C++14
-constexpr chrono::nanoseconds                           operator "" ns(unsigned long long); // C++14
-constexpr chrono::duration<unspecified , nano>          operator "" ns(long double); // C++14
-
 }  // std
 */

@@ -292,7 +279,7 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 namespace chrono
 {

-template <class _Rep, class _Period = ratio<1> > class _LIBCPP_TYPE_VIS_ONLY duration;
+template <class _Rep, class _Period = ratio<1> > class _LIBCPP_TYPE_VIS duration;

 template <class _Tp>
 struct __is_duration : false_type {};
@@ -312,8 +299,8 @@ struct __is_duration<const volatile duration<_Rep, _Period> > : true_type  {};
 } // chrono

 template <class _Rep1, class _Period1, class _Rep2, class _Period2>
-struct _LIBCPP_TYPE_VIS_ONLY common_type<chrono::duration<_Rep1, _Period1>,
-                                         chrono::duration<_Rep2, _Period2> >
+struct _LIBCPP_TYPE_VIS common_type<chrono::duration<_Rep1, _Period1>,
+                                   chrono::duration<_Rep2, _Period2> >
 {
    typedef chrono::duration<typename common_type<_Rep1, _Rep2>::type,
                             typename __ratio_gcd<_Period1, _Period2>::type> type;
@@ -390,10 +377,10 @@ duration_cast(const duration<_Rep, _Period>& __fd)
 }

 template <class _Rep>
-struct _LIBCPP_TYPE_VIS_ONLY treat_as_floating_point : is_floating_point<_Rep> {};
+struct _LIBCPP_TYPE_VIS treat_as_floating_point : is_floating_point<_Rep> {};

 template <class _Rep>
-struct _LIBCPP_TYPE_VIS_ONLY duration_values
+struct _LIBCPP_TYPE_VIS duration_values
 {
 public:
    _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR _Rep zero() {return _Rep(0);}
@@ -404,42 +391,11 @@ public:
 // duration

 template <class _Rep, class _Period>
-class _LIBCPP_TYPE_VIS_ONLY duration
+class _LIBCPP_TYPE_VIS duration
 {
    static_assert(!__is_duration<_Rep>::value, "A duration representation can not be a duration");
    static_assert(__is_ratio<_Period>::value, "Second template parameter of duration must be a std::ratio");
    static_assert(_Period::num > 0, "duration period must be positive");
-
-    template <class _R1, class _R2>
-    struct __no_overflow
-    {
-    private:
-        static const intmax_t __gcd_n1_n2 = __static_gcd<_R1::num, _R2::num>::value;
-        static const intmax_t __gcd_d1_d2 = __static_gcd<_R1::den, _R2::den>::value;
-        static const intmax_t __n1 = _R1::num / __gcd_n1_n2;
-        static const intmax_t __d1 = _R1::den / __gcd_d1_d2;
-        static const intmax_t __n2 = _R2::num / __gcd_n1_n2;
-        static const intmax_t __d2 = _R2::den / __gcd_d1_d2;
-        static const intmax_t max = -((intmax_t(1) << (sizeof(intmax_t) * CHAR_BIT - 1)) + 1);
-
-        template <intmax_t _Xp, intmax_t _Yp, bool __overflow>
-        struct __mul    // __overflow == false
-        {
-            static const intmax_t value = _Xp * _Yp;
-        };
-
-        template <intmax_t _Xp, intmax_t _Yp>
-        struct __mul<_Xp, _Yp, true>
-        {
-            static const intmax_t value = 1;
-        };
-
-    public:
-        static const bool value = (__n1 <= max / __d2) && (__n2 <= max / __d1);
-        typedef ratio<__mul<__n1, __d2, !value>::value,
-                      __mul<__n2, __d1, !value>::value> type;
-    };
-    
 public:
    typedef _Rep rep;
    typedef _Period period;
@@ -447,13 +403,7 @@ private:
    rep __rep_;
 public:

-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
-#ifndef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
-        duration() = default;
-#else
-        duration() {}
-#endif
-
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR duration() {} // = default;
    template <class _Rep2>
        _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
        explicit duration(const _Rep2& __r,
@@ -471,10 +421,9 @@ public:
        duration(const duration<_Rep2, _Period2>& __d,
            typename enable_if
            <
-                __no_overflow<_Period2, period>::value && (
                treat_as_floating_point<rep>::value ||
-                (__no_overflow<_Period2, period>::type::den == 1 &&
-                 !treat_as_floating_point<_Rep2>::value))
+                (ratio_divide<_Period2, period>::type::den == 1 &&
+                 !treat_as_floating_point<_Rep2>::value)
            >::type* = 0)
                : __rep_(_VSTD::chrono::duration_cast<duration>(__d).count()) {}

@@ -519,7 +468,7 @@ template <class _LhsDuration, class _RhsDuration>
 struct __duration_eq
 {
    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
-    bool operator()(const _LhsDuration& __lhs, const _RhsDuration& __rhs) const
+    bool operator()(const _LhsDuration& __lhs, const _RhsDuration& __rhs)
        {
            typedef typename common_type<_LhsDuration, _RhsDuration>::type _Ct;
            return _Ct(__lhs).count() == _Ct(__rhs).count();
@@ -530,7 +479,7 @@ template <class _LhsDuration>
 struct __duration_eq<_LhsDuration, _LhsDuration>
 {
    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
-    bool operator()(const _LhsDuration& __lhs, const _LhsDuration& __rhs) const
+    bool operator()(const _LhsDuration& __lhs, const _LhsDuration& __rhs)
        {return __lhs.count() == __rhs.count();}
 };

@@ -560,7 +509,7 @@ template <class _LhsDuration, class _RhsDuration>
 struct __duration_lt
 {
    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
-    bool operator()(const _LhsDuration& __lhs, const _RhsDuration& __rhs) const
+    bool operator()(const _LhsDuration& __lhs, const _RhsDuration& __rhs)
        {
            typedef typename common_type<_LhsDuration, _RhsDuration>::type _Ct;
            return _Ct(__lhs).count() < _Ct(__rhs).count();
@@ -571,7 +520,7 @@ template <class _LhsDuration>
 struct __duration_lt<_LhsDuration, _LhsDuration>
 {
    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
-    bool operator()(const _LhsDuration& __lhs, const _LhsDuration& __rhs) const
+    bool operator()(const _LhsDuration& __lhs, const _LhsDuration& __rhs)
        {return __lhs.count() < __rhs.count();}
 };

@@ -747,7 +696,7 @@ operator%(const duration<_Rep1, _Period1>& __lhs, const duration<_Rep2, _Period2
 //////////////////////////////////////////////////////////

 template <class _Clock, class _Duration = typename _Clock::duration>
-class _LIBCPP_TYPE_VIS_ONLY time_point
+class _LIBCPP_TYPE_VIS time_point
 {
    static_assert(__is_duration<_Duration>::value,
                  "Second template parameter of time_point must be a std::chrono::duration");
@@ -760,12 +709,12 @@ private:
    duration __d_;

 public:
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 time_point() : __d_(duration::zero()) {}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 explicit time_point(const duration& __d) : __d_(__d) {}
+    _LIBCPP_INLINE_VISIBILITY time_point() : __d_(duration::zero()) {}
+    _LIBCPP_INLINE_VISIBILITY explicit time_point(const duration& __d) : __d_(__d) {}

    // conversions
    template <class _Duration2>
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+    _LIBCPP_INLINE_VISIBILITY
    time_point(const time_point<clock, _Duration2>& t,
        typename enable_if
        <
@@ -775,12 +724,12 @@ public:

    // observer

-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 duration time_since_epoch() const {return __d_;}
+    _LIBCPP_INLINE_VISIBILITY duration time_since_epoch() const {return __d_;}

    // arithmetic

-    _LIBCPP_INLINE_VISIBILITY time_point& operator+=(const duration& __d) {__d_ += __d; return *this;}
-    _LIBCPP_INLINE_VISIBILITY time_point& operator-=(const duration& __d) {__d_ -= __d; return *this;}
+	_LIBCPP_INLINE_VISIBILITY time_point& operator+=(const duration& __d) {__d_ += __d; return *this;}
+	_LIBCPP_INLINE_VISIBILITY time_point& operator-=(const duration& __d) {__d_ -= __d; return *this;}

    // special values

@@ -791,8 +740,8 @@ public:
 } // chrono

 template <class _Clock, class _Duration1, class _Duration2>
-struct _LIBCPP_TYPE_VIS_ONLY common_type<chrono::time_point<_Clock, _Duration1>,
-                                         chrono::time_point<_Clock, _Duration2> >
+struct _LIBCPP_TYPE_VIS common_type<chrono::time_point<_Clock, _Duration1>,
+                                   chrono::time_point<_Clock, _Duration2> >
 {
    typedef chrono::time_point<_Clock, typename common_type<_Duration1, _Duration2>::type> type;
 };
@@ -800,7 +749,7 @@ struct _LIBCPP_TYPE_VIS_ONLY common_type<chrono::time_point<_Clock, _Duration1>,
 namespace chrono {

 template <class _ToDuration, class _Clock, class _Duration>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 time_point<_Clock, _ToDuration>
 time_point_cast(const time_point<_Clock, _Duration>& __t)
 {
@@ -810,7 +759,7 @@ time_point_cast(const time_point<_Clock, _Duration>& __t)
 // time_point ==

 template <class _Clock, class _Duration1, class _Duration2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator==(const time_point<_Clock, _Duration1>& __lhs, const time_point<_Clock, _Duration2>& __rhs)
 {
@@ -820,7 +769,7 @@ operator==(const time_point<_Clock, _Duration1>& __lhs, const time_point<_Clock,
 // time_point !=

 template <class _Clock, class _Duration1, class _Duration2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator!=(const time_point<_Clock, _Duration1>& __lhs, const time_point<_Clock, _Duration2>& __rhs)
 {
@@ -830,7 +779,7 @@ operator!=(const time_point<_Clock, _Duration1>& __lhs, const time_point<_Clock,
 // time_point <

 template <class _Clock, class _Duration1, class _Duration2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator<(const time_point<_Clock, _Duration1>& __lhs, const time_point<_Clock, _Duration2>& __rhs)
 {
@@ -840,7 +789,7 @@ operator<(const time_point<_Clock, _Duration1>& __lhs, const time_point<_Clock,
 // time_point >

 template <class _Clock, class _Duration1, class _Duration2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator>(const time_point<_Clock, _Duration1>& __lhs, const time_point<_Clock, _Duration2>& __rhs)
 {
@@ -850,7 +799,7 @@ operator>(const time_point<_Clock, _Duration1>& __lhs, const time_point<_Clock,
 // time_point <=

 template <class _Clock, class _Duration1, class _Duration2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator<=(const time_point<_Clock, _Duration1>& __lhs, const time_point<_Clock, _Duration2>& __rhs)
 {
@@ -860,7 +809,7 @@ operator<=(const time_point<_Clock, _Duration1>& __lhs, const time_point<_Clock,
 // time_point >=

 template <class _Clock, class _Duration1, class _Duration2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator>=(const time_point<_Clock, _Duration1>& __lhs, const time_point<_Clock, _Duration2>& __rhs)
 {
@@ -870,18 +819,20 @@ operator>=(const time_point<_Clock, _Duration1>& __lhs, const time_point<_Clock,
 // time_point operator+(time_point x, duration y);

 template <class _Clock, class _Duration1, class _Rep2, class _Period2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 time_point<_Clock, typename common_type<_Duration1, duration<_Rep2, _Period2> >::type>
 operator+(const time_point<_Clock, _Duration1>& __lhs, const duration<_Rep2, _Period2>& __rhs)
 {
    typedef time_point<_Clock, typename common_type<_Duration1, duration<_Rep2, _Period2> >::type> _Tr;
-    return _Tr (__lhs.time_since_epoch() + __rhs);
+    _Tr __r(__lhs.time_since_epoch());
+    __r += __rhs;
+    return __r;
 }

 // time_point operator+(duration x, time_point y);

 template <class _Rep1, class _Period1, class _Clock, class _Duration2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 time_point<_Clock, typename common_type<duration<_Rep1, _Period1>, _Duration2>::type>
 operator+(const duration<_Rep1, _Period1>& __lhs, const time_point<_Clock, _Duration2>& __rhs)
 {
@@ -891,7 +842,7 @@ operator+(const duration<_Rep1, _Period1>& __lhs, const time_point<_Clock, _Dura
 // time_point operator-(time_point x, duration y);

 template <class _Clock, class _Duration1, class _Rep2, class _Period2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 time_point<_Clock, typename common_type<_Duration1, duration<_Rep2, _Period2> >::type>
 operator-(const time_point<_Clock, _Duration1>& __lhs, const duration<_Rep2, _Period2>& __rhs)
 {
@@ -901,7 +852,7 @@ operator-(const time_point<_Clock, _Duration1>& __lhs, const duration<_Rep2, _Pe
 // duration operator-(time_point x, time_point y);

 template <class _Clock, class _Duration1, class _Duration2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 typename common_type<_Duration1, _Duration2>::type
 operator-(const time_point<_Clock, _Duration1>& __lhs, const time_point<_Clock, _Duration2>& __rhs)
 {
@@ -919,7 +870,7 @@ public:
    typedef duration::rep                    rep;
    typedef duration::period                 period;
    typedef chrono::time_point<system_clock> time_point;
-    static _LIBCPP_CONSTEXPR_AFTER_CXX11 const bool is_steady = false;
+    static const bool is_steady =            false;

    static time_point now() _NOEXCEPT;
    static time_t     to_time_t  (const time_point& __t) _NOEXCEPT;
@@ -933,7 +884,7 @@ public:
    typedef duration::rep                                 rep;
    typedef duration::period                              period;
    typedef chrono::time_point<steady_clock, duration>    time_point;
-    static _LIBCPP_CONSTEXPR_AFTER_CXX11 const bool is_steady = true;
+    static const bool is_steady =                         true;

    static time_point now() _NOEXCEPT;
 };
@@ -942,86 +893,6 @@ typedef steady_clock high_resolution_clock;

 } // chrono

-#if _LIBCPP_STD_VER > 11
-// Suffixes for duration literals [time.duration.literals]
-inline namespace literals
-{ 
-  inline namespace chrono_literals
-  {
-
-    constexpr chrono::hours operator"" h(unsigned long long __h)
-    {
-        return chrono::hours(static_cast<chrono::hours::rep>(__h));
-    }
-
-    constexpr chrono::duration<long double, ratio<3600,1>> operator"" h(long double __h)
-    {
-        return chrono::duration<long double, ratio<3600,1>>(__h);
-    }
-
-
-    constexpr chrono::minutes operator"" min(unsigned long long __m)
-    {
-        return chrono::minutes(static_cast<chrono::minutes::rep>(__m));
-    }
-
-    constexpr chrono::duration<long double, ratio<60,1>> operator"" min(long double __m)
-    {
-        return chrono::duration<long double, ratio<60,1>> (__m);
-    }
-
-
-    constexpr chrono::seconds operator"" s(unsigned long long __s)
-    {
-        return chrono::seconds(static_cast<chrono::seconds::rep>(__s));
-    }
-
-    constexpr chrono::duration<long double> operator"" s(long double __s)
-    {
-        return chrono::duration<long double> (__s);
-    }
-
-
-    constexpr chrono::milliseconds operator"" ms(unsigned long long __ms)
-    {
-        return chrono::milliseconds(static_cast<chrono::milliseconds::rep>(__ms));
-    }
-
-    constexpr chrono::duration<long double, milli> operator"" ms(long double __ms)
-    {
-        return chrono::duration<long double, milli>(__ms);
-    }
-
-
-    constexpr chrono::microseconds operator"" us(unsigned long long __us)
-    {
-        return chrono::microseconds(static_cast<chrono::microseconds::rep>(__us));
-    }
-
-    constexpr chrono::duration<long double, micro> operator"" us(long double __us)
-    {
-        return chrono::duration<long double, micro> (__us);
-    }
-    
-
-    constexpr chrono::nanoseconds operator"" ns(unsigned long long __ns)
-    {
-        return chrono::nanoseconds(static_cast<chrono::nanoseconds::rep>(__ns));
-    }
-
-    constexpr chrono::duration<long double, nano> operator"" ns(long double __ns)
-    {
-        return chrono::duration<long double, nano> (__ns);
-    }
-
-}}
-
-namespace chrono { // hoist the literals into namespace std::chrono
-   using namespace literals::chrono_literals;
-}
-
-#endif
-
 _LIBCPP_END_NAMESPACE_STD

 #endif  // _LIBCPP_CHRONO
--- a/include/cmath
+++ b/include/cmath
@@ -301,7 +301,7 @@ long double    truncl(long double x);
 #include <math.h>
 #include <type_traits>

-#ifdef _LIBCPP_MSVCRT
+#ifdef _MSC_VER
 #include "support/win32/math_win32.h"
 #endif

@@ -654,7 +654,6 @@ using ::double_t;

 // abs

-#if !defined(_AIX)
 inline _LIBCPP_INLINE_VISIBILITY
 float
 abs(float __x) _NOEXCEPT {return fabsf(__x);}
@@ -666,7 +665,6 @@ abs(double __x) _NOEXCEPT {return fabs(__x);}
 inline _LIBCPP_INLINE_VISIBILITY
 long double
 abs(long double __x) _NOEXCEPT {return fabsl(__x);}
-#endif // !defined(_AIX)

 #ifndef __sun__

@@ -675,7 +673,7 @@ abs(long double __x) _NOEXCEPT {return fabsl(__x);}
 using ::acos;
 using ::acosf;

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       acos(float __x) _NOEXCEPT       {return acosf(__x);}
 inline _LIBCPP_INLINE_VISIBILITY long double acos(long double __x) _NOEXCEPT {return acosl(__x);}
 #endif
@@ -690,7 +688,7 @@ acos(_A1 __x) _NOEXCEPT {return acos((double)__x);}
 using ::asin;
 using ::asinf;

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       asin(float __x) _NOEXCEPT       {return asinf(__x);}
 inline _LIBCPP_INLINE_VISIBILITY long double asin(long double __x) _NOEXCEPT {return asinl(__x);}
 #endif
@@ -705,7 +703,7 @@ asin(_A1 __x) _NOEXCEPT {return asin((double)__x);}
 using ::atan;
 using ::atanf;

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       atan(float __x) _NOEXCEPT       {return atanf(__x);}
 inline _LIBCPP_INLINE_VISIBILITY long double atan(long double __x) _NOEXCEPT {return atanl(__x);}
 #endif
@@ -720,7 +718,7 @@ atan(_A1 __x) _NOEXCEPT {return atan((double)__x);}
 using ::atan2;
 using ::atan2f;

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       atan2(float __y, float __x) _NOEXCEPT             {return atan2f(__y, __x);}
 inline _LIBCPP_INLINE_VISIBILITY long double atan2(long double __y, long double __x) _NOEXCEPT {return atan2l(__y, __x);}
 #endif
@@ -746,7 +744,7 @@ atan2(_A1 __y, _A2 __x) _NOEXCEPT
 using ::ceil;
 using ::ceilf;

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       ceil(float __x) _NOEXCEPT       {return ceilf(__x);}
 inline _LIBCPP_INLINE_VISIBILITY long double ceil(long double __x) _NOEXCEPT {return ceill(__x);}
 #endif
@@ -761,13 +759,13 @@ ceil(_A1 __x) _NOEXCEPT {return ceil((double)__x);}
 using ::cos;
 using ::cosf;

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       cos(float __x) _NOEXCEPT       {return cosf(__x);}
 inline _LIBCPP_INLINE_VISIBILITY long double cos(long double __x) _NOEXCEPT {return cosl(__x);}
 #endif

 template <class _A1>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_ALWAYS_INLINE _LIBCPP_INLINE_VISIBILITY
 typename enable_if<is_integral<_A1>::value, double>::type
 cos(_A1 __x) _NOEXCEPT {return cos((double)__x);}

@@ -776,7 +774,7 @@ cos(_A1 __x) _NOEXCEPT {return cos((double)__x);}
 using ::cosh;
 using ::coshf;

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       cosh(float __x) _NOEXCEPT       {return coshf(__x);}
 inline _LIBCPP_INLINE_VISIBILITY long double cosh(long double __x) _NOEXCEPT {return coshl(__x);}
 #endif
@@ -794,7 +792,7 @@ using ::expf;

 #ifndef __sun__

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       exp(float __x) _NOEXCEPT       {return expf(__x);}
 inline _LIBCPP_INLINE_VISIBILITY long double exp(long double __x) _NOEXCEPT {return expl(__x);}
 #endif
@@ -810,7 +808,7 @@ exp(_A1 __x) _NOEXCEPT {return exp((double)__x);}
 using ::fabs;
 using ::fabsf;

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       fabs(float __x) _NOEXCEPT       {return fabsf(__x);}
 inline _LIBCPP_INLINE_VISIBILITY long double fabs(long double __x) _NOEXCEPT {return fabsl(__x);}
 #endif
@@ -825,7 +823,7 @@ fabs(_A1 __x) _NOEXCEPT {return fabs((double)__x);}
 using ::floor;
 using ::floorf;

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       floor(float __x) _NOEXCEPT       {return floorf(__x);}
 inline _LIBCPP_INLINE_VISIBILITY long double floor(long double __x) _NOEXCEPT {return floorl(__x);}
 #endif
@@ -842,7 +840,7 @@ using ::fmod;
 using ::fmodf;
 #ifndef __sun__

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       fmod(float __x, float __y) _NOEXCEPT             {return fmodf(__x, __y);}
 inline _LIBCPP_INLINE_VISIBILITY long double fmod(long double __x, long double __y) _NOEXCEPT {return fmodl(__x, __y);}
 #endif
@@ -869,7 +867,7 @@ fmod(_A1 __x, _A2 __y) _NOEXCEPT
 using ::frexp;
 using ::frexpf;

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       frexp(float __x, int* __e) _NOEXCEPT       {return frexpf(__x, __e);}
 inline _LIBCPP_INLINE_VISIBILITY long double frexp(long double __x, int* __e) _NOEXCEPT {return frexpl(__x, __e);}
 #endif
@@ -884,7 +882,7 @@ frexp(_A1 __x, int* __e) _NOEXCEPT {return frexp((double)__x, __e);}
 using ::ldexp;
 using ::ldexpf;

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       ldexp(float __x, int __e) _NOEXCEPT       {return ldexpf(__x, __e);}
 inline _LIBCPP_INLINE_VISIBILITY long double ldexp(long double __x, int __e) _NOEXCEPT {return ldexpl(__x, __e);}
 #endif
@@ -901,7 +899,7 @@ using ::log;
 using ::logf;
 #ifndef __sun__

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       log(float __x) _NOEXCEPT       {return logf(__x);}
 inline _LIBCPP_INLINE_VISIBILITY long double log(long double __x) _NOEXCEPT {return logl(__x);}
 #endif
@@ -917,7 +915,7 @@ log(_A1 __x) _NOEXCEPT {return log((double)__x);}
 using ::log10;
 using ::log10f;

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       log10(float __x) _NOEXCEPT       {return log10f(__x);}
 inline _LIBCPP_INLINE_VISIBILITY long double log10(long double __x) _NOEXCEPT {return log10l(__x);}
 #endif
@@ -932,7 +930,7 @@ log10(_A1 __x) _NOEXCEPT {return log10((double)__x);}
 using ::modf;
 using ::modff;

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       modf(float __x, float* __y) _NOEXCEPT             {return modff(__x, __y);}
 inline _LIBCPP_INLINE_VISIBILITY long double modf(long double __x, long double* __y) _NOEXCEPT {return modfl(__x, __y);}
 #endif
@@ -945,7 +943,7 @@ using ::powf;

 #ifndef __sun__

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       pow(float __x, float __y) _NOEXCEPT             {return powf(__x, __y);}
 inline _LIBCPP_INLINE_VISIBILITY long double pow(long double __x, long double __y) _NOEXCEPT {return powl(__x, __y);}
 #endif
@@ -972,7 +970,7 @@ pow(_A1 __x, _A2 __y) _NOEXCEPT
 using ::sin;
 using ::sinf;

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       sin(float __x) _NOEXCEPT       {return sinf(__x);}
 inline _LIBCPP_INLINE_VISIBILITY long double sin(long double __x) _NOEXCEPT {return sinl(__x);}
 #endif
@@ -987,7 +985,7 @@ sin(_A1 __x) _NOEXCEPT {return sin((double)__x);}
 using ::sinh;
 using ::sinhf;

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       sinh(float __x) _NOEXCEPT       {return sinhf(__x);}
 inline _LIBCPP_INLINE_VISIBILITY long double sinh(long double __x) _NOEXCEPT {return sinhl(__x);}
 #endif
@@ -1004,7 +1002,7 @@ using ::sqrt;
 using ::sqrtf;


-#if !(defined(_LIBCPP_MSVCRT) || defined(__sun__) || defined(_AIX))
+#if !(defined(_MSC_VER) || defined(__sun__))
 inline _LIBCPP_INLINE_VISIBILITY float       sqrt(float __x) _NOEXCEPT       {return sqrtf(__x);}
 inline _LIBCPP_INLINE_VISIBILITY long double sqrt(long double __x) _NOEXCEPT {return sqrtl(__x);}
 #endif
@@ -1020,7 +1018,7 @@ using ::tan;
 using ::tanf;
 #ifndef __sun__

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       tan(float __x) _NOEXCEPT       {return tanf(__x);}
 inline _LIBCPP_INLINE_VISIBILITY long double tan(long double __x) _NOEXCEPT {return tanl(__x);}
 #endif
@@ -1035,7 +1033,7 @@ tan(_A1 __x) _NOEXCEPT {return tan((double)__x);}
 using ::tanh;
 using ::tanhf;

-#if !(defined(_LIBCPP_MSVCRT) || defined(_AIX))
+#ifndef _MSC_VER
 inline _LIBCPP_INLINE_VISIBILITY float       tanh(float __x) _NOEXCEPT       {return tanhf(__x);}
 inline _LIBCPP_INLINE_VISIBILITY long double tanh(long double __x) _NOEXCEPT {return tanhl(__x);}
 #endif
@@ -1047,7 +1045,7 @@ tanh(_A1 __x) _NOEXCEPT {return tanh((double)__x);}

 // acosh

-#ifndef _LIBCPP_MSVCRT
+#ifndef _MSC_VER
 using ::acosh;
 using ::acoshf;

@@ -1062,7 +1060,7 @@ acosh(_A1 __x) _NOEXCEPT {return acosh((double)__x);}

 // asinh

-#ifndef _LIBCPP_MSVCRT
+#ifndef _MSC_VER
 using ::asinh;
 using ::asinhf;

@@ -1077,7 +1075,7 @@ asinh(_A1 __x) _NOEXCEPT {return asinh((double)__x);}

 // atanh

-#ifndef _LIBCPP_MSVCRT
+#ifndef _MSC_VER
 using ::atanh;
 using ::atanhf;

@@ -1092,7 +1090,7 @@ atanh(_A1 __x) _NOEXCEPT {return atanh((double)__x);}

 // cbrt

-#ifndef _LIBCPP_MSVCRT
+#ifndef _MSC_VER
 using ::cbrt;
 using ::cbrtf;

@@ -1129,7 +1127,7 @@ copysign(_A1 __x, _A2 __y) _NOEXCEPT
    return copysign((__result_type)__x, (__result_type)__y);
 }

-#ifndef _LIBCPP_MSVCRT
+#ifndef _MSC_VER

 // erf

@@ -1428,18 +1426,13 @@ inline _LIBCPP_INLINE_VISIBILITY
 typename enable_if<is_integral<_A1>::value, long>::type
 lround(_A1 __x) _NOEXCEPT {return lround((double)__x);}

-#endif // _LIBCPP_MSVCRT
-#endif // __sun__
-
 // nan
-
-#ifndef _LIBCPP_MSVCRT
+#endif // _MSC_VER
+#endif // __sun__
 using ::nan;
 using ::nanf;
-#endif // _LIBCPP_MSVCRT
-
 #ifndef __sun__
-#ifndef _LIBCPP_MSVCRT
+#ifndef _MSC_VER

 // nearbyint

@@ -1617,7 +1610,7 @@ inline _LIBCPP_INLINE_VISIBILITY
 typename enable_if<is_integral<_A1>::value, double>::type
 trunc(_A1 __x) _NOEXCEPT {return trunc((double)__x);}

-#endif // !_LIBCPP_MSVCRT
+#endif // !_MSC_VER

 using ::acosl;
 using ::asinl;
@@ -1640,15 +1633,15 @@ using ::sinl;
 using ::sinhl;
 using ::sqrtl;
 using ::tanl;
-#ifndef _LIBCPP_MSVCRT
+#ifndef _MSC_VER
 using ::tanhl;
 using ::acoshl;
 using ::asinhl;
 using ::atanhl;
 using ::cbrtl;
-#endif  // !_LIBCPP_MSVCRT
+#endif  // !_MSC_VER
 using ::copysignl;
-#ifndef _LIBCPP_MSVCRT
+#ifndef _MSC_VER
 using ::erfl;
 using ::erfcl;
 using ::exp2l;
@@ -1679,7 +1672,7 @@ using ::scalblnl;
 using ::scalbnl;
 using ::tgammal;
 using ::truncl;
-#endif // !_LIBCPP_MSVCRT
+#endif // !_MSC_VER

 #else 
 using ::lgamma;
--- a/include/codecvt
+++ b/include/codecvt
@@ -29,8 +29,7 @@ template <class Elem, unsigned long Maxcode = 0x10ffff,
 class codecvt_utf8
    : public codecvt<Elem, char, mbstate_t>
 {
-    explicit codecvt_utf8(size_t refs = 0);
-    ~codecvt_utf8();
+    // unspecified
 };

 template <class Elem, unsigned long Maxcode = 0x10ffff,
@@ -38,8 +37,7 @@ template <class Elem, unsigned long Maxcode = 0x10ffff,
 class codecvt_utf16
    : public codecvt<Elem, char, mbstate_t>
 {
-    explicit codecvt_utf16(size_t refs = 0);
-    ~codecvt_utf16();
+    // unspecified
 };

 template <class Elem, unsigned long Maxcode = 0x10ffff,
@@ -47,8 +45,7 @@ template <class Elem, unsigned long Maxcode = 0x10ffff,
 class codecvt_utf8_utf16
    : public codecvt<Elem, char, mbstate_t>
 {
-    explicit codecvt_utf8_utf16(size_t refs = 0);
-    ~codecvt_utf8_utf16();
+    // unspecified
 };

 }  // std
@@ -76,7 +73,7 @@ enum codecvt_mode
 template <class _Elem> class __codecvt_utf8;

 template <>
-class _LIBCPP_TYPE_VIS __codecvt_utf8<wchar_t>
+class __codecvt_utf8<wchar_t>
    : public codecvt<wchar_t, char, mbstate_t>
 {
    unsigned long _Maxcode_;
@@ -111,7 +108,7 @@ protected:
 };

 template <>
-class _LIBCPP_TYPE_VIS __codecvt_utf8<char16_t>
+class __codecvt_utf8<char16_t>
    : public codecvt<char16_t, char, mbstate_t>
 {
    unsigned long _Maxcode_;
@@ -146,7 +143,7 @@ protected:
 };

 template <>
-class _LIBCPP_TYPE_VIS __codecvt_utf8<char32_t>
+class __codecvt_utf8<char32_t>
    : public codecvt<char32_t, char, mbstate_t>
 {
    unsigned long _Maxcode_;
@@ -182,7 +179,7 @@ protected:

 template <class _Elem, unsigned long _Maxcode = 0x10ffff,
          codecvt_mode _Mode = (codecvt_mode)0>
-class _LIBCPP_TYPE_VIS_ONLY codecvt_utf8
+class _LIBCPP_TYPE_VIS codecvt_utf8
    : public __codecvt_utf8<_Elem>
 {
 public:
@@ -199,7 +196,7 @@ public:
 template <class _Elem, bool _LittleEndian> class __codecvt_utf16;

 template <>
-class _LIBCPP_TYPE_VIS __codecvt_utf16<wchar_t, false>
+class __codecvt_utf16<wchar_t, false>
    : public codecvt<wchar_t, char, mbstate_t>
 {
    unsigned long _Maxcode_;
@@ -234,7 +231,7 @@ protected:
 };

 template <>
-class _LIBCPP_TYPE_VIS __codecvt_utf16<wchar_t, true>
+class __codecvt_utf16<wchar_t, true>
    : public codecvt<wchar_t, char, mbstate_t>
 {
    unsigned long _Maxcode_;
@@ -269,7 +266,7 @@ protected:
 };

 template <>
-class _LIBCPP_TYPE_VIS __codecvt_utf16<char16_t, false>
+class __codecvt_utf16<char16_t, false>
    : public codecvt<char16_t, char, mbstate_t>
 {
    unsigned long _Maxcode_;
@@ -304,7 +301,7 @@ protected:
 };

 template <>
-class _LIBCPP_TYPE_VIS __codecvt_utf16<char16_t, true>
+class __codecvt_utf16<char16_t, true>
    : public codecvt<char16_t, char, mbstate_t>
 {
    unsigned long _Maxcode_;
@@ -339,7 +336,7 @@ protected:
 };

 template <>
-class _LIBCPP_TYPE_VIS __codecvt_utf16<char32_t, false>
+class __codecvt_utf16<char32_t, false>
    : public codecvt<char32_t, char, mbstate_t>
 {
    unsigned long _Maxcode_;
@@ -374,7 +371,7 @@ protected:
 };

 template <>
-class _LIBCPP_TYPE_VIS __codecvt_utf16<char32_t, true>
+class __codecvt_utf16<char32_t, true>
    : public codecvt<char32_t, char, mbstate_t>
 {
    unsigned long _Maxcode_;
@@ -410,7 +407,7 @@ protected:

 template <class _Elem, unsigned long _Maxcode = 0x10ffff,
          codecvt_mode _Mode = (codecvt_mode)0>
-class _LIBCPP_TYPE_VIS_ONLY codecvt_utf16
+class _LIBCPP_TYPE_VIS codecvt_utf16
    : public __codecvt_utf16<_Elem, _Mode & little_endian>
 {
 public:
@@ -427,7 +424,7 @@ public:
 template <class _Elem> class __codecvt_utf8_utf16;

 template <>
-class _LIBCPP_TYPE_VIS __codecvt_utf8_utf16<wchar_t>
+class __codecvt_utf8_utf16<wchar_t>
    : public codecvt<wchar_t, char, mbstate_t>
 {
    unsigned long _Maxcode_;
@@ -462,7 +459,7 @@ protected:
 };

 template <>
-class _LIBCPP_TYPE_VIS __codecvt_utf8_utf16<char32_t>
+class __codecvt_utf8_utf16<char32_t>
    : public codecvt<char32_t, char, mbstate_t>
 {
    unsigned long _Maxcode_;
@@ -497,7 +494,7 @@ protected:
 };

 template <>
-class _LIBCPP_TYPE_VIS __codecvt_utf8_utf16<char16_t>
+class __codecvt_utf8_utf16<char16_t>
    : public codecvt<char16_t, char, mbstate_t>
 {
    unsigned long _Maxcode_;
@@ -533,7 +530,7 @@ protected:

 template <class _Elem, unsigned long _Maxcode = 0x10ffff,
          codecvt_mode _Mode = (codecvt_mode)0>
-class _LIBCPP_TYPE_VIS_ONLY codecvt_utf8_utf16
+class _LIBCPP_TYPE_VIS codecvt_utf8_utf16
    : public __codecvt_utf8_utf16<_Elem>
 {
 public:
--- a/include/complex
+++ b/include/complex
@@ -23,12 +23,12 @@ class complex
 public:
    typedef T value_type;

-    complex(const T& re = T(), const T& im = T()); // constexpr in C++14
-    complex(const complex&);  // constexpr in C++14
-    template<class X> complex(const complex<X>&);  // constexpr in C++14
+    complex(const T& re = T(), const T& im = T());
+    complex(const complex&);
+    template<class X> complex(const complex<X>&);

-    T real() const; // constexpr in C++14
-    T imag() const; // constexpr in C++14
+    T real() const;
+    T imag() const;

    void real(T);
    void imag(T);
@@ -149,12 +149,12 @@ template<class T> complex<T> operator/(const complex<T>&, const T&);
 template<class T> complex<T> operator/(const T&, const complex<T>&);
 template<class T> complex<T> operator+(const complex<T>&);
 template<class T> complex<T> operator-(const complex<T>&);
-template<class T> bool operator==(const complex<T>&, const complex<T>&); // constexpr in C++14
-template<class T> bool operator==(const complex<T>&, const T&); // constexpr in C++14
-template<class T> bool operator==(const T&, const complex<T>&); // constexpr in C++14
-template<class T> bool operator!=(const complex<T>&, const complex<T>&); // constexpr in C++14
-template<class T> bool operator!=(const complex<T>&, const T&); // constexpr in C++14
-template<class T> bool operator!=(const T&, const complex<T>&); // constexpr in C++14
+template<class T> bool operator==(const complex<T>&, const complex<T>&);
+template<class T> bool operator==(const complex<T>&, const T&);
+template<class T> bool operator==(const T&, const complex<T>&);
+template<class T> bool operator!=(const complex<T>&, const complex<T>&);
+template<class T> bool operator!=(const complex<T>&, const T&);
+template<class T> bool operator!=(const T&, const complex<T>&);

 template<class T, class charT, class traits>
  basic_istream<charT, traits>&
@@ -165,17 +165,17 @@ template<class T, class charT, class traits>

 // 26.3.7 values:

-template<class T>              T real(const complex<T>&); // constexpr in C++14
-                     long double real(long double);       // constexpr in C++14
-                          double real(double);            // constexpr in C++14
-template<Integral T>      double real(T);                 // constexpr in C++14
-                          float  real(float);             // constexpr in C++14
+template<class T>              T real(const complex<T>&);
+                     long double real(long double);
+                          double real(double);
+template<Integral T>      double real(T);
+                          float  real(float);

-template<class T>              T imag(const complex<T>&); // constexpr in C++14
-                     long double imag(long double);       // constexpr in C++14
-                          double imag(double);            // constexpr in C++14
-template<Integral T>      double imag(T);                 // constexpr in C++14
-                          float  imag(float);             // constexpr in C++14
+template<class T>              T imag(const complex<T>&);
+                     long double imag(long double);
+                          double imag(double);
+template<Integral T>      double imag(T);
+                          float  imag(float);

 template<class T> T abs(const complex<T>&);

@@ -255,13 +255,13 @@ template<class T, class charT, class traits>

 _LIBCPP_BEGIN_NAMESPACE_STD

-template<class _Tp> class _LIBCPP_TYPE_VIS_ONLY complex;
+template<class _Tp> class _LIBCPP_TYPE_VIS complex;

 template<class _Tp> complex<_Tp> operator*(const complex<_Tp>& __z, const complex<_Tp>& __w);
 template<class _Tp> complex<_Tp> operator/(const complex<_Tp>& __x, const complex<_Tp>& __y);

 template<class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY complex
+class _LIBCPP_TYPE_VIS complex
 {
 public:
    typedef _Tp value_type;
@@ -269,15 +269,15 @@ private:
    value_type __re_;
    value_type __im_;
 public:
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+    _LIBCPP_INLINE_VISIBILITY
    complex(const value_type& __re = value_type(), const value_type& __im = value_type())
        : __re_(__re), __im_(__im) {}
-    template<class _Xp> _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+    template<class _Xp> _LIBCPP_INLINE_VISIBILITY
    complex(const complex<_Xp>& __c)
        : __re_(__c.real()), __im_(__c.imag()) {}

-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 value_type real() const {return __re_;}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 value_type imag() const {return __im_;}
+    _LIBCPP_INLINE_VISIBILITY value_type real() const {return __re_;}
+    _LIBCPP_INLINE_VISIBILITY value_type imag() const {return __im_;}

    _LIBCPP_INLINE_VISIBILITY void real(value_type __re) {__re_ = __re;}
    _LIBCPP_INLINE_VISIBILITY void imag(value_type __im) {__im_ = __im;}
@@ -309,21 +309,21 @@ public:
        }
    template<class _Xp> _LIBCPP_INLINE_VISIBILITY complex& operator*=(const complex<_Xp>& __c)
        {
-            *this = *this * complex(__c.real(), __c.imag());
+            *this = *this * __c;
            return *this;
        }
    template<class _Xp> _LIBCPP_INLINE_VISIBILITY complex& operator/=(const complex<_Xp>& __c)
        {
-            *this = *this / complex(__c.real(), __c.imag());
+            *this = *this / __c;
            return *this;
        }
 };

-template<> class _LIBCPP_TYPE_VIS_ONLY complex<double>;
-template<> class _LIBCPP_TYPE_VIS_ONLY complex<long double>;
+template<> class _LIBCPP_TYPE_VIS complex<double>;
+template<> class _LIBCPP_TYPE_VIS complex<long double>;

 template<>
-class _LIBCPP_TYPE_VIS_ONLY complex<float>
+class _LIBCPP_TYPE_VIS complex<float>
 {
    float __re_;
    float __im_;
@@ -368,18 +368,18 @@ public:
        }
    template<class _Xp> _LIBCPP_INLINE_VISIBILITY complex& operator*=(const complex<_Xp>& __c)
        {
-            *this = *this * complex(__c.real(), __c.imag());
+            *this = *this * __c;
            return *this;
        }
    template<class _Xp> _LIBCPP_INLINE_VISIBILITY complex& operator/=(const complex<_Xp>& __c)
        {
-            *this = *this / complex(__c.real(), __c.imag());
+            *this = *this / __c;
            return *this;
        }
 };

 template<>
-class _LIBCPP_TYPE_VIS_ONLY complex<double>
+class _LIBCPP_TYPE_VIS complex<double>
 {
    double __re_;
    double __im_;
@@ -424,18 +424,18 @@ public:
        }
    template<class _Xp> _LIBCPP_INLINE_VISIBILITY complex& operator*=(const complex<_Xp>& __c)
        {
-            *this = *this * complex(__c.real(), __c.imag());
+            *this = *this * __c;
            return *this;
        }
    template<class _Xp> _LIBCPP_INLINE_VISIBILITY complex& operator/=(const complex<_Xp>& __c)
        {
-            *this = *this / complex(__c.real(), __c.imag());
+            *this = *this / __c;
            return *this;
        }
 };

 template<>
-class _LIBCPP_TYPE_VIS_ONLY complex<long double>
+class _LIBCPP_TYPE_VIS complex<long double>
 {
    long double __re_;
    long double __im_;
@@ -480,12 +480,12 @@ public:
        }
    template<class _Xp> _LIBCPP_INLINE_VISIBILITY complex& operator*=(const complex<_Xp>& __c)
        {
-            *this = *this * complex(__c.real(), __c.imag());
+            *this = *this * __c;
            return *this;
        }
    template<class _Xp> _LIBCPP_INLINE_VISIBILITY complex& operator/=(const complex<_Xp>& __c)
        {
-            *this = *this / complex(__c.real(), __c.imag());
+            *this = *this / __c;
            return *this;
        }
 };
@@ -740,7 +740,7 @@ operator-(const complex<_Tp>& __x)
 }

 template<class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator==(const complex<_Tp>& __x, const complex<_Tp>& __y)
 {
@@ -748,7 +748,7 @@ operator==(const complex<_Tp>& __x, const complex<_Tp>& __y)
 }

 template<class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator==(const complex<_Tp>& __x, const _Tp& __y)
 {
@@ -756,7 +756,7 @@ operator==(const complex<_Tp>& __x, const _Tp& __y)
 }

 template<class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator==(const _Tp& __x, const complex<_Tp>& __y)
 {
@@ -764,7 +764,7 @@ operator==(const _Tp& __x, const complex<_Tp>& __y)
 }

 template<class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator!=(const complex<_Tp>& __x, const complex<_Tp>& __y)
 {
@@ -772,7 +772,7 @@ operator!=(const complex<_Tp>& __x, const complex<_Tp>& __y)
 }

 template<class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator!=(const complex<_Tp>& __x, const _Tp& __y)
 {
@@ -780,7 +780,7 @@ operator!=(const complex<_Tp>& __x, const _Tp& __y)
 }

 template<class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator!=(const _Tp& __x, const complex<_Tp>& __y)
 {
@@ -792,21 +792,21 @@ operator!=(const _Tp& __x, const complex<_Tp>& __y)
 // real

 template<class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 _Tp
 real(const complex<_Tp>& __c)
 {
    return __c.real();
 }

-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 long double
 real(long double __re)
 {
    return __re;
 }

-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 double
 real(double __re)
 {
@@ -814,7 +814,7 @@ real(double __re)
 }

 template<class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 typename enable_if
 <
    is_integral<_Tp>::value,
@@ -825,7 +825,7 @@ real(_Tp  __re)
    return __re;
 }

-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 float
 real(float  __re)
 {
@@ -835,21 +835,21 @@ real(float  __re)
 // imag

 template<class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 _Tp
 imag(const complex<_Tp>& __c)
 {
    return __c.imag();
 }

-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 long double
 imag(long double __re)
 {
    return 0;
 }

-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 double
 imag(double __re)
 {
@@ -857,7 +857,7 @@ imag(double __re)
 }

 template<class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 typename enable_if
 <
    is_integral<_Tp>::value,
@@ -868,7 +868,7 @@ imag(_Tp  __re)
    return 0;
 }

-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 float
 imag(float  __re)
 {
@@ -1521,47 +1521,6 @@ operator<<(basic_ostream<_CharT, _Traits>& __os, const complex<_Tp>& __x)
    return __os << __s.str();
 }

-#if _LIBCPP_STD_VER > 11 
-// Literal suffix for complex number literals [complex.literals]
-inline namespace literals
-{ 
-  inline namespace complex_literals
-  {
-    constexpr complex<long double> operator""il(long double __im)
-    {
-        return { 0.0l, __im };
-    }
-
-    constexpr complex<long double> operator""il(unsigned long long __im)
-    {
-        return { 0.0l, static_cast<long double>(__im) };
-    }
-
-
-    constexpr complex<double> operator""i(long double __im)
-    {
-        return { 0.0, static_cast<double>(__im) };
-    }
-
-    constexpr complex<double> operator""i(unsigned long long __im)
-    {
-        return { 0.0, static_cast<double>(__im) };
-    }
-
-
-    constexpr complex<float> operator""if(long double __im)
-    {
-        return { 0.0f, static_cast<float>(__im) };
-    }
-
-    constexpr complex<float> operator""if(unsigned long long __im)
-    {
-        return { 0.0f, static_cast<float>(__im) };
-    }
-  }
-}
-#endif
-
 _LIBCPP_END_NAMESPACE_STD

 #endif  // _LIBCPP_COMPLEX
--- a/include/cstddef
+++ b/include/cstddef
@@ -56,7 +56,7 @@ typedef long double max_align_t;

 #ifdef _LIBCPP_HAS_NO_NULLPTR

-struct _LIBCPP_TYPE_VIS_ONLY nullptr_t
+struct _LIBCPP_TYPE_VIS nullptr_t
 {
    void* __lx;

--- a/include/cstdio
+++ b/include/cstdio
@@ -74,7 +74,7 @@ int fputc(int c, FILE* stream);
 int fputs(const char* restrict s, FILE* restrict stream);
 int getc(FILE* stream);
 int getchar(void);
-char* gets(char* s);  // removed in C++14
+char* gets(char* s);
 int putc(int c, FILE* stream);
 int putchar(int c);
 int puts(const char* s);
@@ -103,11 +103,6 @@ void perror(const char* s);
 #pragma GCC system_header
 #endif

-// snprintf
-#if defined(_LIBCPP_MSVCRT)
-#include "support/win32/support.h"
-#endif
-
 #ifdef getc
 inline _LIBCPP_INLINE_VISIBILITY int __libcpp_getc(FILE* __stream) {return getc(__stream);}
 #undef getc
@@ -143,12 +138,12 @@ using ::scanf;
 using ::snprintf;
 using ::sprintf;
 using ::sscanf;
-#ifndef _LIBCPP_MSVCRT
+#ifndef _MSC_VER
 using ::vfprintf;
 using ::vfscanf;
 using ::vscanf;
 using ::vsscanf;
-#endif // _LIBCPP_MSVCRT
+#endif // _MSC_VER
 using ::vprintf;
 using ::vsnprintf;
 using ::vsprintf;
@@ -158,9 +153,7 @@ using ::fputc;
 using ::fputs;
 using ::getc;
 using ::getchar;
-#if _LIBCPP_STD_VER <= 11
 using ::gets;
-#endif
 using ::putc;
 using ::putchar;
 using ::puts;
--- a/include/cstdlib
+++ b/include/cstdlib
@@ -84,9 +84,9 @@ void *aligned_alloc(size_t alignment, size_t size);                       // C11

 #include <__config>
 #include <stdlib.h>
-#ifdef _LIBCPP_MSVCRT
+#ifdef _MSC_VER
 #include "support/win32/locale_win32.h"
-#endif // _LIBCPP_MSVCRT
+#endif // _MSC_VER

 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
@@ -154,8 +154,8 @@ using ::quick_exit;
 using ::aligned_alloc;
 #endif

-// MSVCRT already has the correct prototype in <stdlib.h> #ifdef __cplusplus
-#if !defined(_LIBCPP_MSVCRT) && !defined(__sun__) && !defined(_AIX)
+// MSVC already has the correct prototype in <stdlib.h.h> #ifdef __cplusplus
+#if !defined(_MSC_VER) && !defined(__sun__)
 inline _LIBCPP_INLINE_VISIBILITY long      abs(     long __x) _NOEXCEPT {return  labs(__x);}
 #ifndef _LIBCPP_HAS_NO_LONG_LONG
 inline _LIBCPP_INLINE_VISIBILITY long long abs(long long __x) _NOEXCEPT {return llabs(__x);}
@@ -165,7 +165,7 @@ inline _LIBCPP_INLINE_VISIBILITY  ldiv_t div(     long __x,      long __y) _NOEX
 #ifndef _LIBCPP_HAS_NO_LONG_LONG
 inline _LIBCPP_INLINE_VISIBILITY lldiv_t div(long long __x, long long __y) _NOEXCEPT {return lldiv(__x, __y);}
 #endif // _LIBCPP_HAS_NO_LONG_LONG
-#endif // _LIBCPP_MSVCRT
+#endif // _MSC_VER

 _LIBCPP_END_NAMESPACE_STD

--- a/include/cstring
+++ b/include/cstring
@@ -93,8 +93,8 @@ using ::strspn;

 using ::strstr;

-// MSVCRT, GNU libc and its derivates already have the correct prototype in <string.h> #ifdef __cplusplus
-#if !defined(__GLIBC__) && !defined(_LIBCPP_MSVCRT) && !defined(__sun__) && !defined(_STRING_H_CPLUSPLUS_98_CONFORMANCE_)
+// MSVC, GNU libc and its derivates already have the correct prototype in <string.h> #ifdef __cplusplus
+#if !defined(__GLIBC__) && !defined(_MSC_VER) && !defined(__sun__) && !defined(_STRING_H_CPLUSPLUS_98_CONFORMANCE_)
 inline _LIBCPP_INLINE_VISIBILITY       char* strchr(      char* __s, int __c) {return ::strchr(__s, __c);}
 inline _LIBCPP_INLINE_VISIBILITY       char* strpbrk(      char* __s1, const char* __s2) {return ::strpbrk(__s1, __s2);}
 inline _LIBCPP_INLINE_VISIBILITY       char* strrchr(      char* __s, int __c) {return ::strrchr(__s, __c);}
--- a/include/cwchar
+++ b/include/cwchar
@@ -106,9 +106,9 @@ size_t wcsrtombs(char* restrict dst, const wchar_t** restrict src, size_t len,
 #include <__config>
 #include <cwctype>
 #include <wchar.h>
-#if defined(_LIBCPP_MSVCRT) || defined(__MINGW32__)
+#ifdef _WIN32
 #include <support/win32/support.h> // pull in *swprintf defines
-#endif // _LIBCPP_MSVCRT
+#endif // _WIN32

 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
@@ -127,12 +127,12 @@ using ::swprintf;
 using ::vfwprintf;
 using ::vswprintf;
 using ::vwprintf;
-#ifndef _LIBCPP_MSVCRT
+#ifndef _MSC_VER
 using ::swscanf;
 using ::vfwscanf;
 using ::vswscanf;
 using ::vwscanf;
-#endif // _LIBCPP_MSVCRT
+#endif // _MSC_VER
 using ::wprintf;
 using ::wscanf;
 using ::fgetwc;
@@ -146,10 +146,10 @@ using ::putwc;
 using ::putwchar;
 using ::ungetwc;
 using ::wcstod;
-#ifndef _LIBCPP_MSVCRT
+#ifndef _MSC_VER
 using ::wcstof;
 using ::wcstold;
-#endif // _LIBCPP_MSVCRT
+#endif // _MSC_VER
 using ::wcstol;
 #ifndef _LIBCPP_HAS_NO_LONG_LONG
 using ::wcstoll;
--- a/include/deque
+++ b/include/deque
@@ -41,7 +41,6 @@ public:
    deque() noexcept(is_nothrow_default_constructible<allocator_type>::value);
    explicit deque(const allocator_type& a);
    explicit deque(size_type n);
-    explicit deque(size_type n, const allocator_type& a); // C++14
    deque(size_type n, const value_type& v);
    deque(size_type n, const value_type& v, const allocator_type& a);
    template <class InputIterator>
@@ -171,7 +170,7 @@ template <class _Tp, class _Allocator> class __deque_base;

 template <class _ValueType, class _Pointer, class _Reference, class _MapPointer,
          class _DiffType, _DiffType _BlockSize>
-class _LIBCPP_TYPE_VIS_ONLY __deque_iterator;
+class _LIBCPP_TYPE_VIS __deque_iterator;

 template <class _RAIter,
          class _V2, class _P2, class _R2, class _M2, class _D2, _D2 _B2>
@@ -263,7 +262,7 @@ move_backward(__deque_iterator<_V1, _P1, _R1, _M1, _D1, _B1> __f,

 template <class _ValueType, class _Pointer, class _Reference, class _MapPointer,
          class _DiffType, _DiffType _BlockSize>
-class _LIBCPP_TYPE_VIS_ONLY __deque_iterator
+class _LIBCPP_TYPE_VIS __deque_iterator
 {
    typedef _MapPointer __map_iterator;
 public:
@@ -279,11 +278,7 @@ public:
    typedef random_access_iterator_tag  iterator_category;
    typedef _Reference                  reference;

-    _LIBCPP_INLINE_VISIBILITY __deque_iterator() _NOEXCEPT
-#if _LIBCPP_STD_VER > 11
-     : __m_iter_(nullptr), __ptr_(nullptr)
-#endif
-     {}
+    _LIBCPP_INLINE_VISIBILITY __deque_iterator() _NOEXCEPT {}

    template <class _Pp, class _Rp, class _MP>
    _LIBCPP_INLINE_VISIBILITY
@@ -415,9 +410,9 @@ private:
        : __m_iter_(__m), __ptr_(__p) {}

    template <class _Tp, class _Ap> friend class __deque_base;
-    template <class _Tp, class _Ap> friend class _LIBCPP_TYPE_VIS_ONLY deque;
+    template <class _Tp, class _Ap> friend class _LIBCPP_TYPE_VIS deque;
    template <class _Vp, class _Pp, class _Rp, class _MP, class _Dp, _Dp>
-        friend class _LIBCPP_TYPE_VIS_ONLY __deque_iterator;
+        friend class _LIBCPP_TYPE_VIS __deque_iterator;

    template <class _RAIter,
              class _V2, class _P2, class _R2, class _M2, class _D2, _D2 _B2>
@@ -920,14 +915,7 @@ protected:
                                                         __pointer_allocator;
    typedef allocator_traits<__pointer_allocator>        __map_traits;
    typedef typename __map_traits::pointer               __map_pointer;
-    typedef typename __alloc_traits::template
-#ifndef _LIBCPP_HAS_NO_TEMPLATE_ALIASES
-                rebind_alloc<const_pointer>
-#else
-                rebind_alloc<const_pointer>::other
-#endif
-                                                         __const_pointer_allocator;
-    typedef typename allocator_traits<__const_pointer_allocator>::const_pointer __map_const_pointer;
+    typedef typename __map_traits::const_pointer         __map_const_pointer;
    typedef __split_buffer<pointer, __pointer_allocator> __map;

    typedef __deque_iterator<value_type, pointer, reference, __map_pointer,
@@ -1065,7 +1053,7 @@ template <class _Tp, class _Allocator>
 typename __deque_base<_Tp, _Allocator>::const_iterator
 __deque_base<_Tp, _Allocator>::begin() const _NOEXCEPT
 {
-    __map_const_pointer __mp = static_cast<__map_const_pointer>(__map_.begin() + __start_ / __block_size);
+    __map_const_pointer __mp = __map_.begin() + __start_ / __block_size;
    return const_iterator(__mp, __map_.empty() ? 0 : *__mp + __start_ % __block_size);
 }

@@ -1083,7 +1071,7 @@ typename __deque_base<_Tp, _Allocator>::const_iterator
 __deque_base<_Tp, _Allocator>::end() const _NOEXCEPT
 {
    size_type __p = size() + __start_;
-    __map_const_pointer __mp = static_cast<__map_const_pointer>(__map_.begin() + __p / __block_size);
+    __map_const_pointer __mp = __map_.begin() + __p / __block_size;
    return const_iterator(__mp, __map_.empty() ? 0 : *__mp + __p % __block_size);
 }

@@ -1179,7 +1167,7 @@ __deque_base<_Tp, _Allocator>::clear() _NOEXCEPT
 }

 template <class _Tp, class _Allocator = allocator<_Tp> >
-class _LIBCPP_TYPE_VIS_ONLY deque
+class _LIBCPP_TYPE_VIS deque
    : private __deque_base<_Tp, _Allocator>
 {
 public:
@@ -1210,9 +1198,6 @@ public:
        {}
    _LIBCPP_INLINE_VISIBILITY deque(const allocator_type& __a) : __base(__a) {}
    explicit deque(size_type __n);
-#if _LIBCPP_STD_VER > 11
-    explicit deque(size_type __n, const _Allocator& __a);
-#endif
    deque(size_type __n, const value_type& __v);
    deque(size_type __n, const value_type& __v, const allocator_type& __a);
    template <class _InputIter>
@@ -1356,8 +1341,6 @@ public:
    _LIBCPP_INLINE_VISIBILITY
    bool __invariants() const {return __base::__invariants();}
 private:
-    typedef typename __base::__map_const_pointer __map_const_pointer;
-
    _LIBCPP_INLINE_VISIBILITY
    static size_type __recommend_blocks(size_type __n)
    {
@@ -1435,16 +1418,6 @@ deque<_Tp, _Allocator>::deque(size_type __n)
        __append(__n);
 }

-#if _LIBCPP_STD_VER > 11
-template <class _Tp, class _Allocator>
-deque<_Tp, _Allocator>::deque(size_type __n, const _Allocator& __a)
-    : __base(__a)
-{
-    if (__n > 0)
-        __append(__n);
-}
-#endif
-
 template <class _Tp, class _Allocator>
 deque<_Tp, _Allocator>::deque(size_type __n, const value_type& __v)
 {
@@ -2532,9 +2505,9 @@ void
 deque<_Tp, _Allocator>::pop_front()
 {
    allocator_type& __a = __base::__alloc();
-    __alloc_traits::destroy(__a, __to_raw_pointer(*(__base::__map_.begin() +
-                                                    __base::__start_ / __base::__block_size) +
-                                                    __base::__start_ % __base::__block_size));
+    __alloc_traits::destroy(__a, *(__base::__map_.begin() +
+                                   __base::__start_ / __base::__block_size) +
+                                   __base::__start_ % __base::__block_size);
    --__base::size();
    if (++__base::__start_ >= 2 * __base::__block_size)
    {
@@ -2550,9 +2523,9 @@ deque<_Tp, _Allocator>::pop_back()
 {
    allocator_type& __a = __base::__alloc();
    size_type __p = __base::size() + __base::__start_ - 1;
-    __alloc_traits::destroy(__a, __to_raw_pointer(*(__base::__map_.begin() +
-                                                    __p / __base::__block_size) +
-                                                    __p % __base::__block_size));
+    __alloc_traits::destroy(__a, *(__base::__map_.begin() +
+                                   __p / __base::__block_size) +
+                                   __p % __base::__block_size);
    --__base::size();
    if (__back_spare() >= 2 * __base::__block_size)
    {
@@ -2583,7 +2556,7 @@ deque<_Tp, _Allocator>::__move_and_check(iterator __f, iterator __l, iterator __
            __fe = __fb + __bs;
        }
        if (__fb <= __vt && __vt < __fe)
-            __vt = (const_iterator(static_cast<__map_const_pointer>(__f.__m_iter_), __vt) -= __f - __r).__ptr_;
+            __vt = (const_iterator(__f.__m_iter_, __vt) -= __f - __r).__ptr_;
        __r = _VSTD::move(__fb, __fe, __r);
        __n -= __bs;
        __f += __bs;
@@ -2614,7 +2587,7 @@ deque<_Tp, _Allocator>::__move_backward_and_check(iterator __f, iterator __l, it
            __lb = __le - __bs;
        }
        if (__lb <= __vt && __vt < __le)
-            __vt = (const_iterator(static_cast<__map_const_pointer>(__l.__m_iter_), __vt) += __r - __l - 1).__ptr_;
+            __vt = (const_iterator(__l.__m_iter_, __vt) += __r - __l - 1).__ptr_;
        __r = _VSTD::move_backward(__lb, __le, __r);
        __n -= __bs;
        __l -= __bs - 1;
@@ -2645,7 +2618,7 @@ deque<_Tp, _Allocator>::__move_construct_and_check(iterator __f, iterator __l,
            __fe = __fb + __bs;
        }
        if (__fb <= __vt && __vt < __fe)
-            __vt = (const_iterator(static_cast<__map_const_pointer>(__f.__m_iter_), __vt) += __r - __f).__ptr_;
+            __vt = (const_iterator(__f.__m_iter_, __vt) += __r - __f).__ptr_;
        for (; __fb != __fe; ++__fb, ++__r, ++__base::size())
            __alloc_traits::construct(__a, _VSTD::addressof(*__r), _VSTD::move(*__fb));
        __n -= __bs;
@@ -2681,7 +2654,7 @@ deque<_Tp, _Allocator>::__move_construct_backward_and_check(iterator __f, iterat
            __lb = __le - __bs;
        }
        if (__lb <= __vt && __vt < __le)
-            __vt = (const_iterator(static_cast<__map_const_pointer>(__l.__m_iter_), __vt) -= __l - __r + 1).__ptr_;
+            __vt = (const_iterator(__l.__m_iter_, __vt) -= __l - __r + 1).__ptr_;
        while (__le != __lb)
        {
            __alloc_traits::construct(__a, _VSTD::addressof(*--__r), _VSTD::move(*--__le));
@@ -2811,7 +2784,7 @@ deque<_Tp, _Allocator>::clear() _NOEXCEPT
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 bool
 operator==(const deque<_Tp, _Allocator>& __x, const deque<_Tp, _Allocator>& __y)
 {
@@ -2820,7 +2793,7 @@ operator==(const deque<_Tp, _Allocator>& __x, const deque<_Tp, _Allocator>& __y)
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 bool
 operator!=(const deque<_Tp, _Allocator>& __x, const deque<_Tp, _Allocator>& __y)
 {
@@ -2828,7 +2801,7 @@ operator!=(const deque<_Tp, _Allocator>& __x, const deque<_Tp, _Allocator>& __y)
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 bool
 operator< (const deque<_Tp, _Allocator>& __x, const deque<_Tp, _Allocator>& __y)
 {
@@ -2836,7 +2809,7 @@ operator< (const deque<_Tp, _Allocator>& __x, const deque<_Tp, _Allocator>& __y)
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 bool
 operator> (const deque<_Tp, _Allocator>& __x, const deque<_Tp, _Allocator>& __y)
 {
@@ -2844,7 +2817,7 @@ operator> (const deque<_Tp, _Allocator>& __x, const deque<_Tp, _Allocator>& __y)
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 bool
 operator>=(const deque<_Tp, _Allocator>& __x, const deque<_Tp, _Allocator>& __y)
 {
@@ -2852,7 +2825,7 @@ operator>=(const deque<_Tp, _Allocator>& __x, const deque<_Tp, _Allocator>& __y)
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 bool
 operator<=(const deque<_Tp, _Allocator>& __x, const deque<_Tp, _Allocator>& __y)
 {
@@ -2860,7 +2833,7 @@ operator<=(const deque<_Tp, _Allocator>& __x, const deque<_Tp, _Allocator>& __y)
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
 swap(deque<_Tp, _Allocator>& __x, deque<_Tp, _Allocator>& __y)
    _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
--- a/include/exception
+++ b/include/exception
@@ -118,8 +118,8 @@ _LIBCPP_FUNC_VIS bool uncaught_exception() _NOEXCEPT;

 class _LIBCPP_TYPE_VIS exception_ptr;

-_LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
-_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);
+exception_ptr current_exception() _NOEXCEPT;
+_LIBCPP_NORETURN void rethrow_exception(exception_ptr);

 class _LIBCPP_TYPE_VIS exception_ptr
 {
@@ -142,8 +142,8 @@ public:
    bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT
        {return !(__x == __y);}

-    friend _LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
-    friend _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);
+    friend exception_ptr current_exception() _NOEXCEPT;
+    friend void rethrow_exception(exception_ptr);
 };

 template<class _Ep>
--- a/include/experimental/dynarray
+++ b/include/experimental/dynarray
@@ -1,314 +0,0 @@
-// -*- C++ -*-
-//===-------------------------- dynarray ----------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef _LIBCPP_DYNARRAY
-#define _LIBCPP_DYNARRAY
-
-#include <__config>
-#if _LIBCPP_STD_VER > 11
-
-/*
-    dynarray synopsis
-
-namespace std { namespace experimental {
-
-template< typename T >
-class dynarray
-{
-    // types:
-    typedef       T                               value_type;
-    typedef       T&                              reference;
-    typedef const T&                              const_reference;
-    typedef       T*                              pointer;
-    typedef const T*                              const_pointer;
-    typedef       implementation-defined          iterator;
-    typedef       implementation-defined          const_iterator;
-    typedef reverse_iterator<iterator>            reverse_iterator;
-    typedef reverse_iterator<const_iterator>      const_reverse_iterator;
-    typedef size_t                                size_type;
-    typedef ptrdiff_t                             difference_type;
-
-public:
-    // construct/copy/destroy:
-    explicit dynarray(size_type c);
-    template <typename Alloc>
-      dynarray(size_type c, const Alloc& alloc);
-    dynarray(size_type c, const T& v);
-    template <typename Alloc>
-      dynarray(size_type c, const T& v, const Alloc& alloc);
-    dynarray(const dynarray& d);
-    template <typename Alloc>
-      dynarray(const dynarray& d, const Alloc& alloc);
-    dynarray(initializer_list<T>);
-    template <typename Alloc>
-      dynarray(initializer_list<T>, const Alloc& alloc);
-
-    dynarray& operator=(const dynarray&) = delete;
-    ~dynarray();
-
-    // iterators:
-    iterator       begin()        noexcept;
-    const_iterator begin()  const noexcept;
-    const_iterator cbegin() const noexcept;
-    iterator       end()          noexcept;
-    const_iterator end()    const noexcept;
-    const_iterator cend()   const noexcept;
-
-    reverse_iterator       rbegin()        noexcept;
-    const_reverse_iterator rbegin()  const noexcept;
-    const_reverse_iterator crbegin() const noexcept;
-    reverse_iterator       rend()          noexcept;
-    const_reverse_iterator rend()    const noexcept;
-    const_reverse_iterator crend()   const noexcept;
-
-    // capacity:
-    size_type size()     const noexcept;
-    size_type max_size() const noexcept;
-    bool      empty()    const noexcept;
-
-    // element access:
-    reference       operator[](size_type n);
-    const_reference operator[](size_type n) const;
-
-    reference       front();
-    const_reference front() const;
-    reference       back();
-    const_reference back()  const;
-
-    const_reference at(size_type n) const;
-    reference       at(size_type n);
-
-    // data access:
-    T*       data()       noexcept;
-    const T* data() const noexcept;
-
-    // mutating member functions:
-    void fill(const T& v);
-};
-
-}}  // std::experimental
-
-*/
-
-#include <__functional_base>
-#include <iterator>
-#include <stdexcept>
-#include <initializer_list>
-#include <new>
-#include <algorithm>
-
-#if defined(_LIBCPP_NO_EXCEPTIONS)
-    #include <cassert>
-#endif
-
-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-#pragma GCC system_header
-#endif
-
-namespace std { namespace experimental { inline namespace __array_extensions_v1 {
-
-template <class _Tp>
-struct _LIBCPP_TYPE_VIS_ONLY dynarray
-{
-public:
-    // types:
-    typedef dynarray __self;
-    typedef _Tp                                   value_type;
-    typedef value_type&                           reference;
-    typedef const value_type&                     const_reference;
-    typedef value_type*                           iterator;
-    typedef const value_type*                     const_iterator;
-    typedef value_type*                           pointer;
-    typedef const value_type*                     const_pointer;
-    typedef size_t                                size_type;
-    typedef ptrdiff_t                             difference_type;
-    typedef std::reverse_iterator<iterator>       reverse_iterator;
-    typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
-
-private:
-    size_t                  __size_;
-    value_type *            __base_;
-    _LIBCPP_ALWAYS_INLINE dynarray () noexcept : __base_(nullptr), __size_(0) {}
-    
-    static inline _LIBCPP_INLINE_VISIBILITY value_type* __allocate ( size_t count )
-    {
-        if ( numeric_limits<size_t>::max() / sizeof (value_type) <= count )
-        {
-#ifndef _LIBCPP_NO_EXCEPTIONS
-            throw bad_array_length();
-#else
-            assert(!"dynarray::allocation");
-#endif
-        }
-        return static_cast<value_type *> (::operator new (sizeof(value_type) * count));
-    }
-
-    static inline _LIBCPP_INLINE_VISIBILITY void __deallocate ( value_type* __ptr ) noexcept
-    {
-        ::operator delete (static_cast<void *> (__ptr));
-    }
-
-public:
-
-    explicit dynarray(size_type __c);
-    dynarray(size_type __c, const value_type& __v);
-    dynarray(const dynarray& __d);
-    dynarray(initializer_list<value_type>);
-
-//  We're not implementing these right now.
-//  Waiting for the resolution of LWG issue #2235
-//     template <typename _Alloc>
-//       dynarray(size_type __c, const _Alloc& __alloc);
-//     template <typename _Alloc>
-//       dynarray(size_type __c, const value_type& __v, const _Alloc& __alloc);
-//     template <typename _Alloc>
-//       dynarray(const dynarray& __d, const _Alloc& __alloc);
-//     template <typename _Alloc>
-//       dynarray(initializer_list<value_type>, const _Alloc& __alloc);
-
-    dynarray& operator=(const dynarray&) = delete;
-    ~dynarray();
-
-    // iterators:
-    inline _LIBCPP_INLINE_VISIBILITY iterator       begin()        noexcept { return iterator(data()); }
-    inline _LIBCPP_INLINE_VISIBILITY const_iterator begin()  const noexcept { return const_iterator(data()); }
-    inline _LIBCPP_INLINE_VISIBILITY const_iterator cbegin() const noexcept { return const_iterator(data()); }
-    inline _LIBCPP_INLINE_VISIBILITY iterator       end()          noexcept { return iterator(data() + __size_); }
-    inline _LIBCPP_INLINE_VISIBILITY const_iterator end()    const noexcept { return const_iterator(data() + __size_); }
-    inline _LIBCPP_INLINE_VISIBILITY const_iterator cend()   const noexcept { return const_iterator(data() + __size_); }
-
-    inline _LIBCPP_INLINE_VISIBILITY reverse_iterator       rbegin()        noexcept { return reverse_iterator(end()); }
-    inline _LIBCPP_INLINE_VISIBILITY const_reverse_iterator rbegin()  const noexcept { return const_reverse_iterator(end()); }
-    inline _LIBCPP_INLINE_VISIBILITY const_reverse_iterator crbegin() const noexcept { return const_reverse_iterator(end()); }
-    inline _LIBCPP_INLINE_VISIBILITY reverse_iterator       rend()          noexcept { return reverse_iterator(begin()); }
-    inline _LIBCPP_INLINE_VISIBILITY const_reverse_iterator rend()    const noexcept { return const_reverse_iterator(begin()); }
-    inline _LIBCPP_INLINE_VISIBILITY const_reverse_iterator crend()   const noexcept { return const_reverse_iterator(begin()); }
-
-    // capacity:
-    inline _LIBCPP_INLINE_VISIBILITY size_type size()     const noexcept { return __size_; }
-    inline _LIBCPP_INLINE_VISIBILITY size_type max_size() const noexcept { return __size_; }
-    inline _LIBCPP_INLINE_VISIBILITY bool      empty()    const noexcept { return __size_ == 0; }
-
-    // element access:
-    inline _LIBCPP_INLINE_VISIBILITY reference       operator[](size_type __n)       { return data()[__n]; }
-    inline _LIBCPP_INLINE_VISIBILITY const_reference operator[](size_type __n) const { return data()[__n]; }
-
-    inline _LIBCPP_INLINE_VISIBILITY reference       front()       { return data()[0]; }
-    inline _LIBCPP_INLINE_VISIBILITY const_reference front() const { return data()[0]; }
-    inline _LIBCPP_INLINE_VISIBILITY reference       back()        { return data()[__size_-1]; }
-    inline _LIBCPP_INLINE_VISIBILITY const_reference back()  const { return data()[__size_-1]; }
-
-    inline _LIBCPP_INLINE_VISIBILITY const_reference at(size_type __n) const;
-    inline _LIBCPP_INLINE_VISIBILITY reference       at(size_type __n);
-
-    // data access:
-    inline _LIBCPP_INLINE_VISIBILITY _Tp*       data()       noexcept { return __base_; }
-    inline _LIBCPP_INLINE_VISIBILITY const _Tp* data() const noexcept { return __base_; }
-
-    // mutating member functions:
-    inline _LIBCPP_INLINE_VISIBILITY void fill(const value_type& __v) { fill_n(begin(), __size_, __v); }
-};
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-dynarray<_Tp>::dynarray(size_type __c) : dynarray ()
-{
-    __base_ = __allocate (__c);
-    value_type *__data = data ();
-    for ( __size_ = 0; __size_ < __c; ++__size_, ++__data )
-        ::new (__data) value_type;
-}
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-dynarray<_Tp>::dynarray(size_type __c, const value_type& __v) : dynarray ()
-{
-    __base_ = __allocate (__c);
-    value_type *__data = data ();
-    for ( __size_ = 0; __size_ < __c; ++__size_, ++__data )
-        ::new (__data) value_type (__v);
-}
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-dynarray<_Tp>::dynarray(initializer_list<value_type> __il) : dynarray ()
-{
-    size_t sz = __il.size();
-    __base_ = __allocate (sz);
-    value_type *__data = data ();
-    auto src = __il.begin();
-    for ( __size_ = 0; __size_ < sz; ++__size_, ++__data, ++src )
-        ::new (__data) value_type (*src);
-}
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-dynarray<_Tp>::dynarray(const dynarray& __d) : dynarray ()
-{
-    size_t sz = __d.size();
-    __base_ = __allocate (sz);
-    value_type *__data = data ();
-    auto src = __d.begin();
-    for ( __size_ = 0; __size_ < sz; ++__size_, ++__data, ++src )
-        ::new (__data) value_type (*src);
-}
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-dynarray<_Tp>::~dynarray()
-{ 
-    value_type *__data = data () + __size_;
-    for ( size_t i = 0; i < __size_; ++i )
-        (--__data)->value_type::~value_type();
-    __deallocate ( __base_ );
-}
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-typename dynarray<_Tp>::reference
-dynarray<_Tp>::at(size_type __n)
-{
-    if (__n >= __size_)
-    {
-#ifndef _LIBCPP_NO_EXCEPTIONS
-        throw out_of_range("dynarray::at");
-#else
-        assert(!"dynarray::at out_of_range");
-#endif
-    }
-    return data()[__n];
-}
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-typename dynarray<_Tp>::const_reference
-dynarray<_Tp>::at(size_type __n) const
-{
-    if (__n >= __size_)
-    {
-#ifndef _LIBCPP_NO_EXCEPTIONS
-        throw out_of_range("dynarray::at");
-#else
-        assert(!"dynarray::at out_of_range");
-#endif
-    }
-    return data()[__n];
-}
-
-}}}
-
-
-_LIBCPP_BEGIN_NAMESPACE_STD
-template <class _Tp, class _Alloc>
-struct _LIBCPP_TYPE_VIS_ONLY uses_allocator<std::experimental::dynarray<_Tp>, _Alloc> : true_type {};
-_LIBCPP_END_NAMESPACE_STD
-
-#endif  // if _LIBCPP_STD_VER > 11 
-#endif  // _LIBCPP_DYNARRAY
--- a/include/experimental/optional
+++ b/include/experimental/optional
@@ -1,699 +0,0 @@
-// -*- C++ -*-
-//===-------------------------- optional ----------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef _LIBCPP_OPTIONAL
-#define _LIBCPP_OPTIONAL
-
-/*
-    optional synopsis
-
-// C++1y
-
-#include <initializer_list>
-
-namespace std { namespace experimental {
-
-// optional for object types
-template <class T>
-class optional
-{
-public:
-    typedef T value_type;
-
-    // constructors
-    constexpr optional() noexcept;
-    constexpr optional(nullopt_t) noexcept;
-    optional(const optional&);
-    optional(optional&&) noexcept(is_nothrow_move_constructible<T>::value);
-    constexpr optional(const T&);
-    constexpr optional(T&&);
-    template <class... Args> constexpr explicit optional(in_place_t, Args&&...);
-    template <class U, class... Args>
-        constexpr explicit optional(in_place_t, initializer_list<U>, Args&&...);
-
-    // destructor
-    ~optional();
-
-    // assignment
-    optional& operator=(nullopt_t) noexcept;
-    optional& operator=(const optional&);
-    optional& operator=(optional&&)
-        noexcept(is_nothrow_move_assignable<T>::value &&
-                 is_nothrow_move_constructible<T>::value);
-    template <class U> optional& operator=(U&&);
-    template <class... Args> void emplace(Args&&...);
-    template <class U, class... Args> void emplace(initializer_list<U>, Args&&...);
-
-    // swap
-    void swap(optional&)
-        noexcept(is_nothrow_move_constructible<T>::value &&
-                 noexcept(swap(declval<T&>(), declval<T&>())));
-
-    // observers
-    constexpr T const* operator->() const;
-    T* operator->();
-    constexpr T const& operator*() const;
-    T& operator*();
-    constexpr explicit operator bool() const noexcept;
-    constexpr T const& value() const;
-    T& value();
-    template <class U> constexpr T value_or(U&&) const&;
-    template <class U> T value_or(U&&) &&;
-};
-
-// In-place construction
-struct in_place_t{};
-constexpr in_place_t in_place{};
-
-// Disengaged state indicator
-struct nullopt_t{see below};
-constexpr nullopt_t nullopt(unspecified);
-
-// class bad_optional_access
-class bad_optional_access
-    : public logic_error
-{
-public:
-    explicit bad_optional_access(const string& what_arg);
-    explicit bad_optional_access(const char* what_arg);
-};
-
-// Relational operators
-template <class T> constexpr bool operator==(const optional<T>&, const optional<T>&);
-template <class T> constexpr bool operator< (const optional<T>&, const optional<T>&);
-
-// Comparison with nullopt
-template <class T> constexpr bool operator==(const optional<T>&, nullopt_t) noexcept;
-template <class T> constexpr bool operator==(nullopt_t, const optional<T>&) noexcept;
-template <class T> constexpr bool operator<(const optional<T>&, nullopt_t) noexcept;
-template <class T> constexpr bool operator<(nullopt_t, const optional<T>&) noexcept;
-
-// Comparison with T
-template <class T> constexpr bool operator==(const optional<T>&, const T&);
-template <class T> constexpr bool operator==(const T&, const optional<T>&);
-template <class T> constexpr bool operator<(const optional<T>&, const T&);
-template <class T> constexpr bool operator<(const T&, const optional<T>&);
-
-// Specialized algorithms
-template <class T> void swap(optional<T>&, optional<T>&) noexcept(see below);
-template <class T> constexpr optional<typename decay<T>::type> make_optional(T&&);
-
-// hash support
-template <class T> struct hash;
-template <class T> struct hash<optional<T>>;
-
-}}  // std::experimental
-
-*/
-
-#include <__config>
-#include <functional>
-#include <stdexcept>
-
-namespace std { namespace experimental {
-
-class _LIBCPP_EXCEPTION_ABI bad_optional_access
-    : public logic_error
-{
-public:
-#if _LIBCPP_STD_VER > 11
-    _LIBCPP_INLINE_VISIBILITY explicit bad_optional_access(const string& __arg)
-        : logic_error(__arg) {}
-    _LIBCPP_INLINE_VISIBILITY explicit bad_optional_access(const char* __arg)
-        : logic_error(__arg) {}
-    _LIBCPP_INLINE_VISIBILITY bad_optional_access(const bad_optional_access&) noexcept = default;
-    _LIBCPP_INLINE_VISIBILITY bad_optional_access& operator=(const bad_optional_access&) noexcept = default;
-#else
-private:
-    bad_optional_access(const bad_optional_access&);
-    bad_optional_access& operator=(const bad_optional_access&);
-public:
-#endif  // _LIBCPP_STD_VER > 11
-    // Get the key function ~bad_optional_access() into the dylib even if not compiling for C++1y
-    virtual ~bad_optional_access() _NOEXCEPT;
-};
-
-}}  // std::experimental
-
-#if _LIBCPP_STD_VER > 11
-
-#include <initializer_list>
-#include <type_traits>
-#include <new>
-#include <__functional_base>
-
-#include <__undef_min_max>
-
-#ifdef _LIBCPP_DEBUG
-#   include <__debug>
-#else
-#   define _LIBCPP_ASSERT(x, m) ((void)0)
-#endif
-
-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-#pragma GCC system_header
-#endif
-
-namespace std { namespace experimental { inline namespace __library_fundamentals_v1 {
-
-struct in_place_t {};
-constexpr in_place_t in_place{};
-
-struct nullopt_t
-{
-    explicit constexpr nullopt_t(int) noexcept {}
-};
-
-constexpr nullopt_t nullopt{0};
-
-template <class _Tp, bool = is_trivially_destructible<_Tp>::value>
-class __optional_storage
-{
-protected:
-    typedef _Tp value_type;
-    union
-    {
-        char __null_state_;
-        value_type __val_;
-    };
-    bool __engaged_ = false;
-
-    _LIBCPP_INLINE_VISIBILITY
-    ~__optional_storage()
-    {
-        if (__engaged_)
-            __val_.~value_type();
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr __optional_storage() noexcept
-        :  __null_state_('\0') {}
-
-    _LIBCPP_INLINE_VISIBILITY
-    __optional_storage(const __optional_storage& __x)
-        :  __engaged_(__x.__engaged_)
-        {
-            if (__engaged_)
-                ::new(_VSTD::addressof(__val_)) value_type(__x.__val_);
-        }
-
-    _LIBCPP_INLINE_VISIBILITY
-    __optional_storage(__optional_storage&& __x)
-                      noexcept(is_nothrow_move_constructible<value_type>::value)
-        :  __engaged_(__x.__engaged_)
-        {
-            if (__engaged_)
-                ::new(_VSTD::addressof(__val_)) value_type(_VSTD::move(__x.__val_));
-        }
-
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr __optional_storage(const value_type& __v)
-        :  __val_(__v),
-           __engaged_(true) {}
-
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr __optional_storage(value_type&& __v)
-        :  __val_(_VSTD::move(__v)),
-           __engaged_(true) {}
-
-    template <class... _Args>
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr
-    explicit __optional_storage(in_place_t, _Args&&... __args)
-       :  __val_(_VSTD::forward<_Args>(__args)...),
-           __engaged_(true) {}
-};
-
-template <class _Tp>
-class __optional_storage<_Tp, true>
-{
-protected:
-    typedef _Tp value_type;
-    union
-    {
-        char __null_state_;
-        value_type __val_;
-    };
-    bool __engaged_ = false;
-
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr __optional_storage() noexcept
-        :  __null_state_('\0') {}
-
-    _LIBCPP_INLINE_VISIBILITY
-    __optional_storage(const __optional_storage& __x)
-        :  __engaged_(__x.__engaged_)
-        {
-            if (__engaged_)
-                ::new(_VSTD::addressof(__val_)) value_type(__x.__val_);
-        }
-
-    _LIBCPP_INLINE_VISIBILITY
-    __optional_storage(__optional_storage&& __x)
-                      noexcept(is_nothrow_move_constructible<value_type>::value)
-        :  __engaged_(__x.__engaged_)
-        {
-            if (__engaged_)
-                ::new(_VSTD::addressof(__val_)) value_type(_VSTD::move(__x.__val_));
-        }
-
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr __optional_storage(const value_type& __v)
-        :  __val_(__v),
-           __engaged_(true) {}
-
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr __optional_storage(value_type&& __v)
-        :  __val_(_VSTD::move(__v)),
-           __engaged_(true) {}
-
-    template <class... _Args>
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr
-    explicit __optional_storage(in_place_t, _Args&&... __args)
-       :  __val_(_VSTD::forward<_Args>(__args)...),
-           __engaged_(true) {}
-};
-
-template <class _Tp>
-class optional
-    : private __optional_storage<_Tp>
-{
-    typedef __optional_storage<_Tp> __base;
-public:
-    typedef _Tp value_type;
-
-    static_assert(!is_reference<value_type>::value,
-              "Instantiation of optional with a reference type is ill-formed.");
-    static_assert(!is_same<typename remove_cv<value_type>::type, in_place_t>::value,
-              "Instantiation of optional with a in_place_t type is ill-formed.");
-    static_assert(!is_same<typename remove_cv<value_type>::type, nullopt_t>::value,
-              "Instantiation of optional with a nullopt_t type is ill-formed.");
-    static_assert(is_object<value_type>::value,
-        "Instantiation of optional with a non-object type is undefined behavior.");
-    static_assert(is_nothrow_destructible<value_type>::value,
-        "Instantiation of optional with an object type that is not noexcept destructible is undefined behavior.");
-
-    _LIBCPP_INLINE_VISIBILITY constexpr optional() noexcept {}
-    _LIBCPP_INLINE_VISIBILITY optional(const optional&) = default;
-    _LIBCPP_INLINE_VISIBILITY optional(optional&&) = default;
-    _LIBCPP_INLINE_VISIBILITY ~optional() = default;
-    _LIBCPP_INLINE_VISIBILITY constexpr optional(nullopt_t) noexcept {}
-    _LIBCPP_INLINE_VISIBILITY constexpr optional(const value_type& __v)
-        : __base(__v) {}
-    _LIBCPP_INLINE_VISIBILITY constexpr optional(value_type&& __v)
-        : __base(_VSTD::move(__v)) {}
-
-    template <class... _Args,
-              class = typename enable_if
-                      <
-                           is_constructible<value_type, _Args...>::value
-                      >::type
-             >
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr
-    explicit optional(in_place_t, _Args&&... __args)
-        : __base(in_place, _VSTD::forward<_Args>(__args)...) {}
-
-    template <class _Up, class... _Args,
-              class = typename enable_if
-                      <
-                           is_constructible<value_type, initializer_list<_Up>&, _Args...>::value
-                      >::type
-             >
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr
-    explicit optional(in_place_t, initializer_list<_Up> __il, _Args&&... __args)
-        : __base(in_place, __il, _VSTD::forward<_Args>(__args)...) {}
-
-    _LIBCPP_INLINE_VISIBILITY
-    optional& operator=(nullopt_t) noexcept
-    {
-        if (this->__engaged_)
-        {
-            this->__val_.~value_type();
-            this->__engaged_ = false;
-        }
-        return *this;
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    optional&
-    operator=(const optional& __opt)
-    {
-        if (this->__engaged_ == __opt.__engaged_)
-        {
-            if (this->__engaged_)
-                this->__val_ = __opt.__val_;
-        }
-        else
-        {
-            if (this->__engaged_)
-                this->__val_.~value_type();
-            else
-                ::new(_VSTD::addressof(this->__val_)) value_type(__opt.__val_);
-            this->__engaged_ = __opt.__engaged_;
-        }
-        return *this;
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    optional&
-    operator=(optional&& __opt)
-        noexcept(is_nothrow_move_assignable<value_type>::value &&
-                 is_nothrow_move_constructible<value_type>::value)
-    {
-        if (this->__engaged_ == __opt.__engaged_)
-        {
-            if (this->__engaged_)
-                this->__val_ = _VSTD::move(__opt.__val_);
-        }
-        else
-        {
-            if (this->__engaged_)
-                this->__val_.~value_type();
-            else
-                ::new(_VSTD::addressof(this->__val_)) value_type(_VSTD::move(__opt.__val_));
-            this->__engaged_ = __opt.__engaged_;
-        }
-        return *this;
-    }
-
-    template <class _Up,
-              class = typename enable_if
-                      <
-                          is_same<typename remove_reference<_Up>::type, value_type>::value &&
-                          is_constructible<value_type, _Up>::value &&
-                          is_assignable<value_type&, _Up>::value
-                      >::type
-             >
-    _LIBCPP_INLINE_VISIBILITY
-    optional&
-    operator=(_Up&& __v)
-    {
-        if (this->__engaged_)
-            this->__val_ = _VSTD::forward<_Up>(__v);
-        else
-        {
-            ::new(_VSTD::addressof(this->__val_)) value_type(_VSTD::forward<_Up>(__v));
-            this->__engaged_ = true;
-        }
-        return *this;
-    }
-
-    template <class... _Args,
-              class = typename enable_if
-                      <
-                          is_constructible<value_type, _Args...>::value
-                      >::type
-             >
-    _LIBCPP_INLINE_VISIBILITY
-    void
-    emplace(_Args&&... __args)
-    {
-        *this = nullopt;
-        ::new(_VSTD::addressof(this->__val_)) value_type(_VSTD::forward<_Args>(__args)...);
-        this->__engaged_ = true;
-    }
-
-    template <class _Up, class... _Args,
-              class = typename enable_if
-                      <
-                          is_constructible<value_type, initializer_list<_Up>&, _Args...>::value
-                      >::type
-             >
-    _LIBCPP_INLINE_VISIBILITY
-    void
-    emplace(initializer_list<_Up> __il, _Args&&... __args)
-    {
-        *this = nullopt;
-        ::new(_VSTD::addressof(this->__val_)) value_type(__il, _VSTD::forward<_Args>(__args)...);
-        this->__engaged_ = true;
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    void
-    swap(optional& __opt)
-        noexcept(is_nothrow_move_constructible<value_type>::value &&
-                 __is_nothrow_swappable<value_type>::value)
-    {
-        using _VSTD::swap;
-        if (this->__engaged_ == __opt.__engaged_)
-        {
-            if (this->__engaged_)
-                swap(this->__val_, __opt.__val_);
-        }
-        else
-        {
-            if (this->__engaged_)
-            {
-                ::new(_VSTD::addressof(__opt.__val_)) value_type(_VSTD::move(this->__val_));
-                this->__val_.~value_type();
-            }
-            else
-            {
-                ::new(_VSTD::addressof(this->__val_)) value_type(_VSTD::move(__opt.__val_));
-                __opt.__val_.~value_type();
-            }
-            swap(this->__engaged_, __opt.__engaged_);
-        }
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr
-    value_type const*
-    operator->() const
-    {
-        _LIBCPP_ASSERT(this->__engaged_, "optional operator-> called for disengaged value");
-        return __operator_arrow(__has_operator_addressof<value_type>{});
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    value_type*
-    operator->()
-    {
-        _LIBCPP_ASSERT(this->__engaged_, "optional operator-> called for disengaged value");
-        return _VSTD::addressof(this->__val_);
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr
-    const value_type&
-    operator*() const
-    {
-        _LIBCPP_ASSERT(this->__engaged_, "optional operator* called for disengaged value");
-        return this->__val_;
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    value_type&
-    operator*()
-    {
-        _LIBCPP_ASSERT(this->__engaged_, "optional operator* called for disengaged value");
-        return this->__val_;
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr explicit operator bool() const noexcept {return this->__engaged_;}
-
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr value_type const& value() const
-    {
-        if (!this->__engaged_)
-            throw bad_optional_access("optional<T>::value: not engaged");
-        return this->__val_;
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    value_type& value()
-    {
-        if (!this->__engaged_)
-            throw bad_optional_access("optional<T>::value: not engaged");
-        return this->__val_;
-    }
-
-    template <class _Up>
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr value_type value_or(_Up&& __v) const&
-    {
-        static_assert(is_copy_constructible<value_type>::value,
-                      "optional<T>::value_or: T must be copy constructible");
-        static_assert(is_convertible<_Up, value_type>::value,
-                      "optional<T>::value_or: U must be convertible to T");
-        return this->__engaged_ ? this->__val_ :
-                                  static_cast<value_type>(_VSTD::forward<_Up>(__v));
-    }
-
-    template <class _Up>
-    _LIBCPP_INLINE_VISIBILITY
-    value_type value_or(_Up&& __v) &&
-    {
-        static_assert(is_move_constructible<value_type>::value,
-                      "optional<T>::value_or: T must be move constructible");
-        static_assert(is_convertible<_Up, value_type>::value,
-                      "optional<T>::value_or: U must be convertible to T");
-        return this->__engaged_ ? _VSTD::move(this->__val_) :
-                                  static_cast<value_type>(_VSTD::forward<_Up>(__v));
-    }
-
-private:
-    _LIBCPP_INLINE_VISIBILITY
-    value_type const*
-    __operator_arrow(true_type) const
-    {
-        return _VSTD::addressof(this->__val_);
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr
-    value_type const*
-    __operator_arrow(false_type) const
-    {
-        return &this->__val_;
-    }
-};
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-constexpr
-bool
-operator==(const optional<_Tp>& __x, const optional<_Tp>& __y)
-{
-    if (static_cast<bool>(__x) != static_cast<bool>(__y))
-        return false;
-    if (!static_cast<bool>(__x))
-        return true;
-    return *__x == *__y;
-}
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-constexpr
-bool
-operator<(const optional<_Tp>& __x, const optional<_Tp>& __y)
-{
-    if (!static_cast<bool>(__y))
-        return false;
-    if (!static_cast<bool>(__x))
-        return true;
-    return less<_Tp>{}(*__x, *__y);
-}
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-constexpr
-bool
-operator==(const optional<_Tp>& __x, nullopt_t) noexcept
-{
-    return !static_cast<bool>(__x);
-}
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-constexpr
-bool
-operator==(nullopt_t, const optional<_Tp>& __x) noexcept
-{
-    return !static_cast<bool>(__x);
-}
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-constexpr
-bool
-operator<(const optional<_Tp>&, nullopt_t) noexcept
-{
-    return false;
-}
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-constexpr
-bool
-operator<(nullopt_t, const optional<_Tp>& __x) noexcept
-{
-    return static_cast<bool>(__x);
-}
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-constexpr
-bool
-operator==(const optional<_Tp>& __x, const _Tp& __v)
-{
-    return static_cast<bool>(__x) ? *__x == __v : false;
-}
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-constexpr
-bool
-operator==(const _Tp& __v, const optional<_Tp>& __x)
-{
-    return static_cast<bool>(__x) ? *__x == __v : false;
-}
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-constexpr
-bool
-operator<(const optional<_Tp>& __x, const _Tp& __v)
-{
-    return static_cast<bool>(__x) ? less<_Tp>{}(*__x, __v) : true;
-}
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-constexpr
-bool
-operator<(const _Tp& __v, const optional<_Tp>& __x)
-{
-    return static_cast<bool>(__x) ? less<_Tp>{}(__v, *__x) : false;
-}
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-void
-swap(optional<_Tp>& __x, optional<_Tp>& __y) noexcept(noexcept(__x.swap(__y)))
-{
-    __x.swap(__y);
-}
-
-template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-constexpr
-optional<typename decay<_Tp>::type>
-make_optional(_Tp&& __v)
-{
-    return optional<typename decay<_Tp>::type>(_VSTD::forward<_Tp>(__v));
-}
-
-}}}  // namespace std::experimental::__library_fundamentals_v1
-
-_LIBCPP_BEGIN_NAMESPACE_STD
-
-template <class _Tp>
-struct _LIBCPP_TYPE_VIS_ONLY hash<std::experimental::optional<_Tp> >
-{
-    typedef std::experimental::optional<_Tp> argument_type;
-    typedef size_t        result_type;
-
-    _LIBCPP_INLINE_VISIBILITY
-    result_type operator()(const argument_type& __opt) const _NOEXCEPT
-    {
-        return static_cast<bool>(__opt) ? hash<_Tp>()(*__opt) : 0;
-    }
-};
-
-_LIBCPP_END_NAMESPACE_STD
-
-#endif  // _LIBCPP_STD_VER > 11
-
-#endif  // _LIBCPP_ARRAY
--- a/include/ext/__hash
+++ b/include/ext/__hash
@@ -19,10 +19,10 @@
 namespace __gnu_cxx {
 using namespace std;

-template <typename _Tp> struct _LIBCPP_TYPE_VIS_ONLY hash : public std::hash<_Tp>
+template <typename T> struct _LIBCPP_TYPE_VIS hash : public std::hash<T>
    { };

-template <> struct _LIBCPP_TYPE_VIS_ONLY hash<const char*>
+template <> struct _LIBCPP_TYPE_VIS hash<const char*>
    : public unary_function<const char*, size_t>
 {
    _LIBCPP_INLINE_VISIBILITY
@@ -32,7 +32,7 @@ template <> struct _LIBCPP_TYPE_VIS_ONLY hash<const char*>
    }
 };

-template <> struct _LIBCPP_TYPE_VIS_ONLY hash<char *>
+template <> struct _LIBCPP_TYPE_VIS hash<char *>
    : public unary_function<char*, size_t>
 {
    _LIBCPP_INLINE_VISIBILITY
--- a/include/ext/hash_map
+++ b/include/ext/hash_map
@@ -206,11 +206,7 @@ template <class Key, class T, class Hash, class Pred, class Alloc>
 #include <ext/__hash>

 #if __DEPRECATED
-#if defined(_MSC_VER) && ! defined(__clang__)
-    _LIBCPP_WARNING("Use of the header <ext/hash_map> is deprecated.  Migrate to <unordered_map>")
-#else
-#   warning Use of the header <ext/hash_map> is deprecated.  Migrate to <unordered_map>
-#endif
+#warning Use of the header <ext/hash_map> is deprecated.  Migrate to <unordered_map>
 #endif

 #pragma GCC system_header
@@ -365,7 +361,7 @@ public:
 };

 template <class _HashIterator>
-class _LIBCPP_TYPE_VIS_ONLY __hash_map_iterator
+class _LIBCPP_TYPE_VIS __hash_map_iterator
 {
    _HashIterator __i_;

@@ -408,15 +404,15 @@ public:
    bool operator!=(const __hash_map_iterator& __x, const __hash_map_iterator& __y)
        {return __x.__i_ != __y.__i_;}

-    template <class, class, class, class, class> friend class _LIBCPP_TYPE_VIS_ONLY hash_map;
-    template <class, class, class, class, class> friend class _LIBCPP_TYPE_VIS_ONLY hash_multimap;
-    template <class> friend class _LIBCPP_TYPE_VIS_ONLY __hash_const_iterator;
-    template <class> friend class _LIBCPP_TYPE_VIS_ONLY __hash_const_local_iterator;
-    template <class> friend class _LIBCPP_TYPE_VIS_ONLY __hash_map_const_iterator;
+    template <class, class, class, class, class> friend class _LIBCPP_TYPE_VIS hash_map;
+    template <class, class, class, class, class> friend class _LIBCPP_TYPE_VIS hash_multimap;
+    template <class> friend class _LIBCPP_TYPE_VIS __hash_const_iterator;
+    template <class> friend class _LIBCPP_TYPE_VIS __hash_const_local_iterator;
+    template <class> friend class _LIBCPP_TYPE_VIS __hash_map_const_iterator;
 };

 template <class _HashIterator>
-class _LIBCPP_TYPE_VIS_ONLY __hash_map_const_iterator
+class _LIBCPP_TYPE_VIS __hash_map_const_iterator
 {
    _HashIterator __i_;

@@ -467,15 +463,15 @@ public:
    bool operator!=(const __hash_map_const_iterator& __x, const __hash_map_const_iterator& __y)
        {return __x.__i_ != __y.__i_;}

-    template <class, class, class, class, class> friend class _LIBCPP_TYPE_VIS_ONLY hash_map;
-    template <class, class, class, class, class> friend class _LIBCPP_TYPE_VIS_ONLY hash_multimap;
-    template <class> friend class _LIBCPP_TYPE_VIS_ONLY __hash_const_iterator;
-    template <class> friend class _LIBCPP_TYPE_VIS_ONLY __hash_const_local_iterator;
+    template <class, class, class, class, class> friend class _LIBCPP_TYPE_VIS hash_map;
+    template <class, class, class, class, class> friend class _LIBCPP_TYPE_VIS hash_multimap;
+    template <class> friend class _LIBCPP_TYPE_VIS __hash_const_iterator;
+    template <class> friend class _LIBCPP_TYPE_VIS __hash_const_local_iterator;
 };

 template <class _Key, class _Tp, class _Hash = hash<_Key>, class _Pred = equal_to<_Key>,
          class _Alloc = allocator<pair<const _Key, _Tp> > >
-class _LIBCPP_TYPE_VIS_ONLY hash_map
+class _LIBCPP_TYPE_VIS hash_map
 {
 public:
    // types
@@ -688,7 +684,7 @@ hash_map<_Key, _Tp, _Hash, _Pred, _Alloc>::__construct_node(const key_type& __k)
    __h.get_deleter().__first_constructed = true;
    __node_traits::construct(__na, _VSTD::addressof(__h->__value_.second));
    __h.get_deleter().__second_constructed = true;
-    return _VSTD::move(__h);  // explicitly moved for C++03
+    return _VSTD::move(__h);
 }

 template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
@@ -754,7 +750,7 @@ operator!=(const hash_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,

 template <class _Key, class _Tp, class _Hash = hash<_Key>, class _Pred = equal_to<_Key>,
          class _Alloc = allocator<pair<const _Key, _Tp> > >
-class _LIBCPP_TYPE_VIS_ONLY hash_multimap
+class _LIBCPP_TYPE_VIS hash_multimap
 {
 public:
    // types
--- a/include/ext/hash_set
+++ b/include/ext/hash_set
@@ -199,11 +199,7 @@ template <class Value, class Hash, class Pred, class Alloc>
 #include <ext/__hash>

 #if __DEPRECATED
-#if defined(_MSC_VER) && ! defined(__clang__)
-    _LIBCPP_WARNING("Use of the header <ext/hash_set> is deprecated.  Migrate to <unordered_set>")
-#else
-#   warning Use of the header <ext/hash_set> is deprecated.  Migrate to <unordered_set>
-#endif
+#warning Use of the header <ext/hash_set> is deprecated.  Migrate to <unordered_set>
 #endif

 namespace __gnu_cxx {
@@ -212,7 +208,7 @@ using namespace std;

 template <class _Value, class _Hash = hash<_Value>, class _Pred = equal_to<_Value>,
          class _Alloc = allocator<_Value> >
-class _LIBCPP_TYPE_VIS_ONLY hash_set
+class _LIBCPP_TYPE_VIS hash_set
 {
 public:
    // types
@@ -433,7 +429,7 @@ operator!=(const hash_set<_Value, _Hash, _Pred, _Alloc>& __x,

 template <class _Value, class _Hash = hash<_Value>, class _Pred = equal_to<_Value>,
          class _Alloc = allocator<_Value> >
-class _LIBCPP_TYPE_VIS_ONLY hash_multiset
+class _LIBCPP_TYPE_VIS hash_multiset
 {
 public:
    // types
--- a/include/forward_list
+++ b/include/forward_list
@@ -38,7 +38,6 @@ public:
        noexcept(is_nothrow_default_constructible<allocator_type>::value);
    explicit forward_list(const allocator_type& a);
    explicit forward_list(size_type n);
-    explicit forward_list(size_type n, const allocator_type& a); // C++14
    forward_list(size_type n, const value_type& v);
    forward_list(size_type n, const value_type& v, const allocator_type& a);
    template <class InputIterator>
@@ -213,11 +212,11 @@ struct __forward_list_node
    value_type __value_;
 };

-template<class _Tp, class _Alloc> class _LIBCPP_TYPE_VIS_ONLY forward_list;
-template<class _NodeConstPtr> class _LIBCPP_TYPE_VIS_ONLY __forward_list_const_iterator;
+template<class _Tp, class _Alloc> class _LIBCPP_TYPE_VIS forward_list;
+template<class _NodeConstPtr> class _LIBCPP_TYPE_VIS __forward_list_const_iterator;

 template <class _NodePtr>
-class _LIBCPP_TYPE_VIS_ONLY __forward_list_iterator
+class _LIBCPP_TYPE_VIS __forward_list_iterator
 {
    typedef _NodePtr __node_pointer;

@@ -226,14 +225,14 @@ class _LIBCPP_TYPE_VIS_ONLY __forward_list_iterator
    _LIBCPP_INLINE_VISIBILITY
    explicit __forward_list_iterator(__node_pointer __p) _NOEXCEPT : __ptr_(__p) {}

-    template<class, class> friend class _LIBCPP_TYPE_VIS_ONLY forward_list;
-    template<class> friend class _LIBCPP_TYPE_VIS_ONLY __forward_list_const_iterator;
+    template<class, class> friend class _LIBCPP_TYPE_VIS forward_list;
+    template<class> friend class _LIBCPP_TYPE_VIS __forward_list_const_iterator;

 public:
    typedef forward_iterator_tag                              iterator_category;
    typedef typename pointer_traits<__node_pointer>::element_type::value_type
                                                              value_type;
-    typedef value_type&                                       reference;
+    typedef value_type& reference;
    typedef typename pointer_traits<__node_pointer>::difference_type
                                                              difference_type;
    typedef typename pointer_traits<__node_pointer>::template
@@ -250,7 +249,7 @@ public:
    _LIBCPP_INLINE_VISIBILITY
    reference operator*() const {return __ptr_->__value_;}
    _LIBCPP_INLINE_VISIBILITY
-    pointer operator->() const {return pointer_traits<pointer>::pointer_to(__ptr_->__value_);}
+    pointer operator->() const {return &__ptr_->__value_;}

    _LIBCPP_INLINE_VISIBILITY
    __forward_list_iterator& operator++()
@@ -277,7 +276,7 @@ public:
 };

 template <class _NodeConstPtr>
-class _LIBCPP_TYPE_VIS_ONLY __forward_list_const_iterator
+class _LIBCPP_TYPE_VIS __forward_list_const_iterator
 {
    typedef _NodeConstPtr __node_const_pointer;

@@ -304,7 +303,7 @@ class _LIBCPP_TYPE_VIS_ONLY __forward_list_const_iterator
 public:
    typedef forward_iterator_tag                              iterator_category;
    typedef typename __node::value_type                       value_type;
-    typedef const value_type&                                 reference;
+    typedef const value_type& reference;
    typedef typename pointer_traits<__node_const_pointer>::difference_type
                                                              difference_type;
    typedef typename pointer_traits<__node_const_pointer>::template
@@ -324,7 +323,7 @@ public:
    _LIBCPP_INLINE_VISIBILITY
    reference operator*() const {return __ptr_->__value_;}
    _LIBCPP_INLINE_VISIBILITY
-    pointer operator->() const {return pointer_traits<pointer>::pointer_to(__ptr_->__value_);}
+    pointer operator->() const {return &__ptr_->__value_;}

    _LIBCPP_INLINE_VISIBILITY
    __forward_list_const_iterator& operator++()
@@ -369,27 +368,18 @@ protected:
                                                      __node_allocator;
    typedef allocator_traits<__node_allocator>        __node_traits;
    typedef typename __node_traits::pointer           __node_pointer;
-    typedef typename __node_traits::pointer           __node_const_pointer;
-
-    typedef typename allocator_traits<allocator_type>::template
-#ifndef _LIBCPP_HAS_NO_TEMPLATE_ALIASES
-                rebind_alloc<__begin_node>
-#else
-                rebind_alloc<__begin_node>::other
-#endif
-                                                      __begin_node_allocator;
-    typedef typename allocator_traits<__begin_node_allocator>::pointer __begin_node_pointer;
+    typedef typename __node_traits::const_pointer     __node_const_pointer;

    __compressed_pair<__begin_node, __node_allocator> __before_begin_;

    _LIBCPP_INLINE_VISIBILITY
    __node_pointer        __before_begin() _NOEXCEPT
-        {return static_cast<__node_pointer>(pointer_traits<__begin_node_pointer>::
-                                        pointer_to(__before_begin_.first()));}
+        {return pointer_traits<__node_pointer>::pointer_to(
+                                static_cast<__node&>(__before_begin_.first()));}
    _LIBCPP_INLINE_VISIBILITY
    __node_const_pointer  __before_begin() const _NOEXCEPT
-        {return static_cast<__node_const_pointer>(pointer_traits<__begin_node_pointer>::
-                                        pointer_to(const_cast<__begin_node&>(__before_begin_.first())));}
+        {return pointer_traits<__node_const_pointer>::pointer_to(
+                          static_cast<const __node&>(__before_begin_.first()));}

    _LIBCPP_INLINE_VISIBILITY
          __node_allocator& __alloc() _NOEXCEPT
@@ -399,7 +389,7 @@ protected:
        {return __before_begin_.second();}

    typedef __forward_list_iterator<__node_pointer>             iterator;
-    typedef __forward_list_const_iterator<__node_pointer>       const_iterator;
+    typedef __forward_list_const_iterator<__node_const_pointer> const_iterator;

    _LIBCPP_INLINE_VISIBILITY
    __forward_list_base()
@@ -543,7 +533,7 @@ __forward_list_base<_Tp, _Alloc>::clear() _NOEXCEPT
 }

 template <class _Tp, class _Alloc = allocator<_Tp> >
-class _LIBCPP_TYPE_VIS_ONLY forward_list
+class _LIBCPP_TYPE_VIS forward_list
    : private __forward_list_base<_Tp, _Alloc>
 {
    typedef __forward_list_base<_Tp, _Alloc> base;
@@ -572,9 +562,6 @@ public:
        {} // = default;
    explicit forward_list(const allocator_type& __a);
    explicit forward_list(size_type __n);
-#if _LIBCPP_STD_VER > 11
-    explicit forward_list(size_type __n, const allocator_type& __a);
-#endif
    forward_list(size_type __n, const value_type& __v);
    forward_list(size_type __n, const value_type& __v, const allocator_type& __a);
    template <class _InputIterator>
@@ -798,28 +785,6 @@ forward_list<_Tp, _Alloc>::forward_list(size_type __n)
    }
 }

-#if _LIBCPP_STD_VER > 11
-template <class _Tp, class _Alloc>
-forward_list<_Tp, _Alloc>::forward_list(size_type __n, const allocator_type& __a)
-    : base ( __a )
-{
-    if (__n > 0)
-    {
-        __node_allocator& __a = base::__alloc();
-        typedef __allocator_destructor<__node_allocator> _Dp;
-        unique_ptr<__node, _Dp> __h(nullptr, _Dp(__a, 1));
-        for (__node_pointer __p = base::__before_begin(); __n > 0; --__n,
-                                                             __p = __p->__next_)
-        {
-            __h.reset(__node_traits::allocate(__a, 1));
-            __node_traits::construct(__a, _VSTD::addressof(__h->__value_));
-            __h->__next_ = nullptr;
-            __p->__next_ = __h.release();
-        }
-    }
-}
-#endif
-
 template <class _Tp, class _Alloc>
 forward_list<_Tp, _Alloc>::forward_list(size_type __n, const value_type& __v)
 {
@@ -1085,7 +1050,7 @@ template <class... _Args>
 typename forward_list<_Tp, _Alloc>::iterator
 forward_list<_Tp, _Alloc>::emplace_after(const_iterator __p, _Args&&... __args)
 {
-    __node_pointer const __r = __p.__ptr_;
+    __node_pointer const __r = const_cast<__node_pointer>(__p.__ptr_);
    __node_allocator& __a = base::__alloc();
    typedef __allocator_destructor<__node_allocator> _Dp;
    unique_ptr<__node, _Dp> __h(__node_traits::allocate(__a, 1), _Dp(__a, 1));
@@ -1102,7 +1067,7 @@ template <class _Tp, class _Alloc>
 typename forward_list<_Tp, _Alloc>::iterator
 forward_list<_Tp, _Alloc>::insert_after(const_iterator __p, value_type&& __v)
 {
-    __node_pointer const __r = __p.__ptr_;
+    __node_pointer const __r = const_cast<__node_pointer>(__p.__ptr_);
    __node_allocator& __a = base::__alloc();
    typedef __allocator_destructor<__node_allocator> _Dp;
    unique_ptr<__node, _Dp> __h(__node_traits::allocate(__a, 1), _Dp(__a, 1));
@@ -1118,7 +1083,7 @@ template <class _Tp, class _Alloc>
 typename forward_list<_Tp, _Alloc>::iterator
 forward_list<_Tp, _Alloc>::insert_after(const_iterator __p, const value_type& __v)
 {
-    __node_pointer const __r = __p.__ptr_;
+    __node_pointer const __r = const_cast<__node_pointer>(__p.__ptr_);
    __node_allocator& __a = base::__alloc();
    typedef __allocator_destructor<__node_allocator> _Dp;
    unique_ptr<__node, _Dp> __h(__node_traits::allocate(__a, 1), _Dp(__a, 1));
@@ -1133,7 +1098,7 @@ typename forward_list<_Tp, _Alloc>::iterator
 forward_list<_Tp, _Alloc>::insert_after(const_iterator __p, size_type __n,
                                        const value_type& __v)
 {
-    __node_pointer __r = __p.__ptr_;
+    __node_pointer __r = const_cast<__node_pointer>(__p.__ptr_);
    if (__n > 0)
    {
        __node_allocator& __a = base::__alloc();
@@ -1183,7 +1148,7 @@ typename enable_if
 forward_list<_Tp, _Alloc>::insert_after(const_iterator __p,
                                        _InputIterator __f, _InputIterator __l)
 {
-    __node_pointer __r = __p.__ptr_;
+    __node_pointer __r = const_cast<__node_pointer>(__p.__ptr_);
    if (__f != __l)
    {
        __node_allocator& __a = base::__alloc();
@@ -1227,7 +1192,7 @@ template <class _Tp, class _Alloc>
 typename forward_list<_Tp, _Alloc>::iterator
 forward_list<_Tp, _Alloc>::erase_after(const_iterator __f)
 {
-    __node_pointer __p = __f.__ptr_;
+    __node_pointer __p = const_cast<__node_pointer>(__f.__ptr_);
    __node_pointer __n = __p->__next_;
    __p->__next_ = __n->__next_;
    __node_allocator& __a = base::__alloc();
@@ -1240,10 +1205,10 @@ template <class _Tp, class _Alloc>
 typename forward_list<_Tp, _Alloc>::iterator
 forward_list<_Tp, _Alloc>::erase_after(const_iterator __f, const_iterator __l)
 {
-    __node_pointer __e = __l.__ptr_;
+    __node_pointer __e = const_cast<__node_pointer>(__l.__ptr_);
    if (__f != __l)
    {
-        __node_pointer __p = __f.__ptr_;
+        __node_pointer __p = const_cast<__node_pointer>(__f.__ptr_);
        __node_pointer __n = __p->__next_;
        if (__n != __e)
        {
@@ -1337,10 +1302,12 @@ forward_list<_Tp, _Alloc>::splice_after(const_iterator __p,
            const_iterator __lm1 = __x.before_begin();
            while (__lm1.__ptr_->__next_ != nullptr)
                ++__lm1;
-            __lm1.__ptr_->__next_ = __p.__ptr_->__next_;
+            const_cast<__node_pointer>(__lm1.__ptr_)->__next_ =
+                const_cast<__node_pointer>(__p.__ptr_)->__next_;
        }
-        __p.__ptr_->__next_ = __x.__before_begin()->__next_;
-        __x.__before_begin()->__next_ = nullptr;
+        const_cast<__node_pointer>(__p.__ptr_)->__next_ =
+            const_cast<__node_pointer>(__x.__before_begin())->__next_;
+        const_cast<__node_pointer>(__x.__before_begin())->__next_ = nullptr;
    }
 }

@@ -1353,9 +1320,12 @@ forward_list<_Tp, _Alloc>::splice_after(const_iterator __p,
    const_iterator __lm1 = _VSTD::next(__i);
    if (__p != __i && __p != __lm1)
    {
-        __i.__ptr_->__next_ = __lm1.__ptr_->__next_;
-        __lm1.__ptr_->__next_ = __p.__ptr_->__next_;
-        __p.__ptr_->__next_ = __lm1.__ptr_;
+        const_cast<__node_pointer>(__i.__ptr_)->__next_ =
+            const_cast<__node_pointer>(__lm1.__ptr_)->__next_;
+        const_cast<__node_pointer>(__lm1.__ptr_)->__next_ =
+            const_cast<__node_pointer>(__p.__ptr_)->__next_;
+        const_cast<__node_pointer>(__p.__ptr_)->__next_ =
+            const_cast<__node_pointer>(__lm1.__ptr_);
    }
 }

@@ -1372,9 +1342,12 @@ forward_list<_Tp, _Alloc>::splice_after(const_iterator __p,
            ++__lm1;
        if (__f != __lm1)
        {
-            __lm1.__ptr_->__next_ = __p.__ptr_->__next_;
-            __p.__ptr_->__next_ = __f.__ptr_->__next_;
-            __f.__ptr_->__next_ = __l.__ptr_;
+            const_cast<__node_pointer>(__lm1.__ptr_)->__next_ =
+                const_cast<__node_pointer>(__p.__ptr_)->__next_;
+            const_cast<__node_pointer>(__p.__ptr_)->__next_ =
+                const_cast<__node_pointer>(__f.__ptr_)->__next_;
+            const_cast<__node_pointer>(__f.__ptr_)->__next_ =
+                const_cast<__node_pointer>(__l.__ptr_);
        }
    }
 }
--- a/include/fstream
+++ b/include/fstream
@@ -180,7 +180,7 @@ typedef basic_fstream<wchar_t> wfstream;
 _LIBCPP_BEGIN_NAMESPACE_STD

 template <class _CharT, class _Traits>
-class _LIBCPP_TYPE_VIS_ONLY basic_filebuf
+class _LIBCPP_TYPE_VIS basic_filebuf
    : public basic_streambuf<_CharT, _Traits>
 {
 public:
@@ -994,7 +994,7 @@ basic_filebuf<_CharT, _Traits>::__write_mode()
 // basic_ifstream

 template <class _CharT, class _Traits>
-class _LIBCPP_TYPE_VIS_ONLY basic_ifstream
+class _LIBCPP_TYPE_VIS basic_ifstream
    : public basic_istream<_CharT, _Traits>
 {
 public:
@@ -1139,7 +1139,7 @@ basic_ifstream<_CharT, _Traits>::close()
 // basic_ofstream

 template <class _CharT, class _Traits>
-class _LIBCPP_TYPE_VIS_ONLY basic_ofstream
+class _LIBCPP_TYPE_VIS basic_ofstream
    : public basic_ostream<_CharT, _Traits>
 {
 public:
@@ -1284,7 +1284,7 @@ basic_ofstream<_CharT, _Traits>::close()
 // basic_fstream

 template <class _CharT, class _Traits>
-class _LIBCPP_TYPE_VIS_ONLY basic_fstream
+class _LIBCPP_TYPE_VIS basic_fstream
    : public basic_iostream<_CharT, _Traits>
 {
 public:
--- a/include/functional
+++ b/include/functional
--- a/include/future
+++ b/include/future
@@ -19,10 +19,10 @@ namespace std

 enum class future_errc
 {
-    future_already_retrieved = 1,
+    broken_promise,
+    future_already_retrieved,
    promise_already_satisfied,
-    no_state,
-    broken_promise
+    no_state
 };

 enum class launch
@@ -309,11 +309,11 @@ public:
 };

 template <class F, class... Args>
-  future<typename result_of<typename decay<F>::type(typename decay<Args>::type...)>::type>
+  future<typename result_of<F(Args...)>::type>
  async(F&& f, Args&&... args);

 template <class F, class... Args>
-  future<typename result_of<typename decay<F>::type(typename decay<Args>::type...)>::type>
+  future<typename result_of<F(Args...)>::type>
  async(launch policy, F&& f, Args&&... args);

 template <class> class packaged_task; // undefined
@@ -379,19 +379,19 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 //enum class future_errc
 _LIBCPP_DECLARE_STRONG_ENUM(future_errc)
 {
-    future_already_retrieved = 1,
+    broken_promise,
+    future_already_retrieved,
    promise_already_satisfied,
-    no_state,
-    broken_promise
+    no_state
 };
 _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(future_errc)

 template <>
-struct _LIBCPP_TYPE_VIS_ONLY is_error_code_enum<future_errc> : public true_type {};
+struct _LIBCPP_TYPE_VIS is_error_code_enum<future_errc> : public true_type {};

 #ifdef _LIBCPP_HAS_NO_STRONG_ENUMS
 template <>
-struct _LIBCPP_TYPE_VIS_ONLY is_error_code_enum<future_errc::__lx> : public true_type { };
+struct _LIBCPP_TYPE_VIS is_error_code_enum<future_errc::__lx> : public true_type { };
 #endif

 //enum class launch
@@ -403,72 +403,6 @@ _LIBCPP_DECLARE_STRONG_ENUM(launch)
 };
 _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(launch)

-#ifndef _LIBCPP_HAS_NO_STRONG_ENUMS
-
-#ifdef _LIBCXX_UNDERLYING_TYPE
-typedef underlying_type<launch>::type __launch_underlying_type;
-#else
-typedef int __launch_underlying_type;
-#endif
-
-inline _LIBCPP_INLINE_VISIBILITY
-_LIBCPP_CONSTEXPR
-launch
-operator&(launch __x, launch __y)
-{
-    return static_cast<launch>(static_cast<__launch_underlying_type>(__x) &
-                               static_cast<__launch_underlying_type>(__y));
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-_LIBCPP_CONSTEXPR
-launch
-operator|(launch __x, launch __y)
-{
-    return static_cast<launch>(static_cast<__launch_underlying_type>(__x) |
-                               static_cast<__launch_underlying_type>(__y));
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-_LIBCPP_CONSTEXPR
-launch
-operator^(launch __x, launch __y)
-{
-    return static_cast<launch>(static_cast<__launch_underlying_type>(__x) ^
-                               static_cast<__launch_underlying_type>(__y));
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-_LIBCPP_CONSTEXPR
-launch
-operator~(launch __x)
-{
-    return static_cast<launch>(~static_cast<__launch_underlying_type>(__x) & 3);
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-launch&
-operator&=(launch& __x, launch __y)
-{
-    __x = __x & __y; return __x;
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-launch&
-operator|=(launch& __x, launch __y)
-{
-    __x = __x | __y; return __x;
-}
-
-inline _LIBCPP_INLINE_VISIBILITY
-launch&
-operator^=(launch& __x, launch __y)
-{
-    __x = __x ^ __y; return __x;
-}
-
-#endif  // !_LIBCPP_HAS_NO_STRONG_ENUMS
-
 //enum class future_status
 _LIBCPP_DECLARE_STRONG_ENUM(future_status)
 {
@@ -508,7 +442,7 @@ public:
    virtual ~future_error() _NOEXCEPT;
 };

-class _LIBCPP_TYPE_VIS __assoc_sub_state
+class __assoc_sub_state
    : public __shared_count
 {
 protected:
@@ -542,14 +476,14 @@ public:
        __state_ |= __future_attached;
    }
    _LIBCPP_INLINE_VISIBILITY
-    bool __has_future_attached() const {return (__state_ & __future_attached) != 0;}
+    bool __has_future_attached() const {return __state_ & __future_attached;}

    _LIBCPP_INLINE_VISIBILITY
    void __set_deferred() {__state_ |= deferred;}

    void __make_ready();
    _LIBCPP_INLINE_VISIBILITY
-    bool __is_ready() const {return (__state_ & ready) != 0;}
+    bool __is_ready() const {return __state_ & ready;}

    void set_value();
    void set_value_at_thread_exit();
@@ -727,7 +661,7 @@ __assoc_state<_Rp&>::set_value(_Rp& __arg)
    if (this->__has_value())
        throw future_error(make_error_code(future_errc::promise_already_satisfied));
 #endif
-    __value_ = _VSTD::addressof(__arg);
+    __value_ = &__arg;
    this->__state_ |= base::__constructed | base::ready;
    __lk.unlock();
    __cv_.notify_all();
@@ -742,7 +676,7 @@ __assoc_state<_Rp&>::set_value_at_thread_exit(_Rp& __arg)
    if (this->__has_value())
        throw future_error(make_error_code(future_errc::promise_already_satisfied));
 #endif
-    __value_ = _VSTD::addressof(__arg);
+    __value_ = &__arg;
    this->__state_ |= base::__constructed;
    __thread_local_data()->__make_ready_at_thread_exit(this);
    __lk.unlock();
@@ -778,7 +712,7 @@ void
 __assoc_state_alloc<_Rp, _Alloc>::__on_zero_shared() _NOEXCEPT
 {
    if (this->__state_ & base::__constructed)
-        reinterpret_cast<_Rp*>(_VSTD::addressof(this->__value_))->~_Rp();
+        reinterpret_cast<_Rp*>(&this->__value_)->~_Rp();
    typename _Alloc::template rebind<__assoc_state_alloc>::other __a(__alloc_);
    this->~__assoc_state_alloc();
    __a.deallocate(this, 1);
@@ -1032,12 +966,12 @@ __async_assoc_state<void, _Fp>::__on_zero_shared() _NOEXCEPT
    base::__on_zero_shared();
 }

-template <class _Rp> class _LIBCPP_TYPE_VIS_ONLY promise;
-template <class _Rp> class _LIBCPP_TYPE_VIS_ONLY shared_future;
+template <class _Rp> class _LIBCPP_TYPE_VIS promise;
+template <class _Rp> class _LIBCPP_TYPE_VIS shared_future;

 // future

-template <class _Rp> class _LIBCPP_TYPE_VIS_ONLY future;
+template <class _Rp> class _LIBCPP_TYPE_VIS future;

 template <class _Rp, class _Fp>
 future<_Rp>
@@ -1056,7 +990,7 @@ __make_async_assoc_state(_Fp __f);
 #endif

 template <class _Rp>
-class _LIBCPP_TYPE_VIS_ONLY future
+class _LIBCPP_TYPE_VIS future
 {
    __assoc_state<_Rp>* __state_;

@@ -1160,7 +1094,7 @@ future<_Rp>::get()
 }

 template <class _Rp>
-class _LIBCPP_TYPE_VIS_ONLY future<_Rp&>
+class _LIBCPP_TYPE_VIS future<_Rp&>
 {
    __assoc_state<_Rp&>* __state_;

@@ -1341,7 +1275,7 @@ swap(future<_Rp>& __x, future<_Rp>& __y) _NOEXCEPT
 template <class _Callable> class packaged_task;

 template <class _Rp>
-class _LIBCPP_TYPE_VIS_ONLY promise
+class _LIBCPP_TYPE_VIS promise
 {
    __assoc_state<_Rp>* __state_;

@@ -1519,7 +1453,7 @@ promise<_Rp>::set_exception_at_thread_exit(exception_ptr __p)
 // promise<R&>

 template <class _Rp>
-class _LIBCPP_TYPE_VIS_ONLY promise<_Rp&>
+class _LIBCPP_TYPE_VIS promise<_Rp&>
 {
    __assoc_state<_Rp&>* __state_;

@@ -1736,7 +1670,7 @@ swap(promise<_Rp>& __x, promise<_Rp>& __y) _NOEXCEPT
 }

 template <class _Rp, class _Alloc>
-    struct _LIBCPP_TYPE_VIS_ONLY uses_allocator<promise<_Rp>, _Alloc>
+    struct _LIBCPP_TYPE_VIS uses_allocator<promise<_Rp>, _Alloc>
        : public true_type {};

 #ifndef _LIBCPP_HAS_NO_VARIADICS
@@ -2000,7 +1934,7 @@ __packaged_task_function<_Rp(_ArgTypes...)>::operator()(_ArgTypes... __arg) cons
 }

 template<class _Rp, class ..._ArgTypes>
-class _LIBCPP_TYPE_VIS_ONLY packaged_task<_Rp(_ArgTypes...)>
+class _LIBCPP_TYPE_VIS packaged_task<_Rp(_ArgTypes...)>
 {
 public:
    typedef _Rp result_type;
@@ -2013,26 +1947,10 @@ public:
    // construction and destruction
    _LIBCPP_INLINE_VISIBILITY
    packaged_task() _NOEXCEPT : __p_(nullptr) {}
-    template <class _Fp,
-              class = typename enable_if
-              <
-                  !is_same<
-                      typename decay<_Fp>::type, 
-                      packaged_task
-                      >::value
-                  >::type
-             >
+    template <class _Fp>
        _LIBCPP_INLINE_VISIBILITY
        explicit packaged_task(_Fp&& __f) : __f_(_VSTD::forward<_Fp>(__f)) {}
-    template <class _Fp, class _Allocator,
-              class = typename enable_if
-              <
-                  !is_same<
-                      typename decay<_Fp>::type, 
-                      packaged_task
-                      >::value
-                  >::type
-              >
+    template <class _Fp, class _Allocator>
        _LIBCPP_INLINE_VISIBILITY
        explicit packaged_task(allocator_arg_t, const _Allocator& __a, _Fp&& __f)
             : __f_(allocator_arg, __a, _VSTD::forward<_Fp>(__f)),
@@ -2131,7 +2049,7 @@ packaged_task<_Rp(_ArgTypes...)>::reset()
 }

 template<class ..._ArgTypes>
-class _LIBCPP_TYPE_VIS_ONLY packaged_task<void(_ArgTypes...)>
+class _LIBCPP_TYPE_VIS packaged_task<void(_ArgTypes...)>
 {
 public:
    typedef void result_type;
@@ -2144,26 +2062,10 @@ public:
    // construction and destruction
    _LIBCPP_INLINE_VISIBILITY
    packaged_task() _NOEXCEPT : __p_(nullptr) {}
-    template <class _Fp,
-              class = typename enable_if
-              <
-                  !is_same<
-                      typename decay<_Fp>::type, 
-                      packaged_task
-                      >::value
-                  >::type
-              >
+    template <class _Fp>
        _LIBCPP_INLINE_VISIBILITY
        explicit packaged_task(_Fp&& __f) : __f_(_VSTD::forward<_Fp>(__f)) {}
-    template <class _Fp, class _Allocator,
-              class = typename enable_if
-              <
-                  !is_same<
-                      typename decay<_Fp>::type, 
-                      packaged_task
-                      >::value
-                  >::type
-              >    
+    template <class _Fp, class _Allocator>
        _LIBCPP_INLINE_VISIBILITY
        explicit packaged_task(allocator_arg_t, const _Allocator& __a, _Fp&& __f)
             : __f_(allocator_arg, __a, _VSTD::forward<_Fp>(__f)),
@@ -2272,7 +2174,7 @@ swap(packaged_task<_Callable>& __x, packaged_task<_Callable>& __y) _NOEXCEPT
 }

 template <class _Callable, class _Alloc>
-struct _LIBCPP_TYPE_VIS_ONLY uses_allocator<packaged_task<_Callable>, _Alloc>
+struct _LIBCPP_TYPE_VIS uses_allocator<packaged_task<_Callable>, _Alloc>
    : public true_type {};

 template <class _Rp, class _Fp>
@@ -2331,32 +2233,20 @@ private:
    }
 };

-inline _LIBCPP_INLINE_VISIBILITY bool __does_policy_contain(launch __policy, launch __value )
-{ return (int(__policy) & int(__value)) != 0; }
-
 template <class _Fp, class... _Args>
 future<typename __invoke_of<typename decay<_Fp>::type, typename decay<_Args>::type...>::type>
 async(launch __policy, _Fp&& __f, _Args&&... __args)
 {
    typedef __async_func<typename decay<_Fp>::type, typename decay<_Args>::type...> _BF;
    typedef typename _BF::_Rp _Rp;
-
-#ifndef _LIBCPP_NO_EXCEPTIONS
-    try
-    {
-#endif
-        if (__does_policy_contain(__policy, launch::async))
-        return _VSTD::__make_async_assoc_state<_Rp>(_BF(__decay_copy(_VSTD::forward<_Fp>(__f)),
+    future<_Rp> __r;
+    if (int(__policy) & int(launch::async))
+        __r = _VSTD::__make_async_assoc_state<_Rp>(_BF(__decay_copy(_VSTD::forward<_Fp>(__f)),
                                                     __decay_copy(_VSTD::forward<_Args>(__args))...));
-#ifndef _LIBCPP_NO_EXCEPTIONS
-    }
-    catch ( ... ) { if (__policy == launch::async) throw ; }
-#endif
-
-    if (__does_policy_contain(__policy, launch::deferred))
-        return _VSTD::__make_deferred_assoc_state<_Rp>(_BF(__decay_copy(_VSTD::forward<_Fp>(__f)),
+    else if (int(__policy) & int(launch::deferred))
+        __r = _VSTD::__make_deferred_assoc_state<_Rp>(_BF(__decay_copy(_VSTD::forward<_Fp>(__f)),
                                                        __decay_copy(_VSTD::forward<_Args>(__args))...));
-    return future<_Rp>{};
+    return __r;
 }

 template <class _Fp, class... _Args>
@@ -2373,7 +2263,7 @@ async(_Fp&& __f, _Args&&... __args)
 // shared_future

 template <class _Rp>
-class _LIBCPP_TYPE_VIS_ONLY shared_future
+class _LIBCPP_TYPE_VIS shared_future
 {
    __assoc_state<_Rp>* __state_;

@@ -2447,7 +2337,7 @@ shared_future<_Rp>::operator=(const shared_future& __rhs)
 }

 template <class _Rp>
-class _LIBCPP_TYPE_VIS_ONLY shared_future<_Rp&>
+class _LIBCPP_TYPE_VIS shared_future<_Rp&>
 {
    __assoc_state<_Rp&>* __state_;

--- a/include/initializer_list
+++ b/include/initializer_list
@@ -29,15 +29,15 @@ public:
    typedef const E* iterator;
    typedef const E* const_iterator;

-    initializer_list() noexcept; // constexpr in C++14
+    initializer_list() noexcept;

-    size_t   size()  const noexcept; // constexpr in C++14
-    const E* begin() const noexcept; // constexpr in C++14
-    const E* end()   const noexcept; // constexpr in C++14
+    size_t   size()  const noexcept;
+    const E* begin() const noexcept;
+    const E* end()   const noexcept;
 };

-template<class E> const E* begin(initializer_list<E> il) noexcept; // constexpr in C++14
-template<class E> const E* end(initializer_list<E> il) noexcept; // constexpr in C++14
+template<class E> const E* begin(initializer_list<E> il) noexcept;
+template<class E> const E* end(initializer_list<E> il) noexcept;

 }  // std

@@ -56,13 +56,12 @@ namespace std  // purposefully not versioned
 #ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

 template<class _Ep>
-class _LIBCPP_TYPE_VIS_ONLY initializer_list
+class _LIBCPP_TYPE_VIS initializer_list
 {
    const _Ep* __begin_;
    size_t    __size_;

    _LIBCPP_ALWAYS_INLINE
-    _LIBCPP_CONSTEXPR_AFTER_CXX11
    initializer_list(const _Ep* __b, size_t __s) _NOEXCEPT
        : __begin_(__b),
          __size_(__s)
@@ -76,26 +75,15 @@ public:
    typedef const _Ep* iterator;
    typedef const _Ep* const_iterator;

-    _LIBCPP_ALWAYS_INLINE
-    _LIBCPP_CONSTEXPR_AFTER_CXX11
-    initializer_list() _NOEXCEPT : __begin_(nullptr), __size_(0) {}
+    _LIBCPP_ALWAYS_INLINE initializer_list() _NOEXCEPT : __begin_(nullptr), __size_(0) {}

-    _LIBCPP_ALWAYS_INLINE
-    _LIBCPP_CONSTEXPR_AFTER_CXX11
-    size_t    size()  const _NOEXCEPT {return __size_;}
-    
-    _LIBCPP_ALWAYS_INLINE
-    _LIBCPP_CONSTEXPR_AFTER_CXX11
-    const _Ep* begin() const _NOEXCEPT {return __begin_;}
-
-    _LIBCPP_ALWAYS_INLINE
-    _LIBCPP_CONSTEXPR_AFTER_CXX11
-    const _Ep* end()   const _NOEXCEPT {return __begin_ + __size_;}
+    _LIBCPP_ALWAYS_INLINE size_t    size()  const _NOEXCEPT {return __size_;}
+    _LIBCPP_ALWAYS_INLINE const _Ep* begin() const _NOEXCEPT {return __begin_;}
+    _LIBCPP_ALWAYS_INLINE const _Ep* end()   const _NOEXCEPT {return __begin_ + __size_;}
 };

 template<class _Ep>
 inline _LIBCPP_INLINE_VISIBILITY
-_LIBCPP_CONSTEXPR_AFTER_CXX11
 const _Ep*
 begin(initializer_list<_Ep> __il) _NOEXCEPT
 {
@@ -104,7 +92,6 @@ begin(initializer_list<_Ep> __il) _NOEXCEPT

 template<class _Ep>
 inline _LIBCPP_INLINE_VISIBILITY
-_LIBCPP_CONSTEXPR_AFTER_CXX11
 const _Ep*
 end(initializer_list<_Ep> __il) _NOEXCEPT
 {
--- a/include/iomanip
+++ b/include/iomanip
@@ -14,8 +14,6 @@
 /*
    iomanip synopsis

-namespace std {
-
 // types T1, T2, ... are unspecified implementation types
 T1 resetiosflags(ios_base::fmtflags mask);
 T2 setiosflags (ios_base::fmtflags mask);
@@ -28,17 +26,6 @@ template <class charT, class moneyT> T8 put_money(const moneyT& mon, bool intl =
 template <class charT> T9 get_time(struct tm* tmb, const charT* fmt);
 template <class charT> T10 put_time(const struct tm* tmb, const charT* fmt);

-template <class charT>
-  T11 quoted(const charT* s, charT delim=charT('"'), charT escape=charT('\\')); // C++14
-
-template <class charT, class traits, class Allocator>
-  T12 quoted(const basic_string<charT, traits, Allocator>& s,
-             charT delim=charT('"'), charT escape=charT('\\')); // C++14
-
-template <class charT, class traits, class Allocator>
-  T13 quoted(basic_string<charT, traits, Allocator>& s,
-             charT delim=charT('"'), charT escape=charT('\\')); // C++14
-
 }  // std

 */
@@ -512,142 +499,6 @@ put_time(const tm* __tm, const _CharT* __fmt)
    return __iom_t10<_CharT>(__tm, __fmt);
 }

-#if _LIBCPP_STD_VER > 11
-
-template <class _CharT, class _Traits, class _ForwardIterator>
-std::basic_ostream<_CharT, _Traits> &
-__quoted_output ( basic_ostream<_CharT, _Traits> &__os, 
-        _ForwardIterator __first, _ForwardIterator __last, _CharT __delim, _CharT __escape )
-{
-    __os << __delim;
-    for ( ; __first != __last; ++ __first )
-    {
-        if (_Traits::eq (*__first, __escape) || _Traits::eq (*__first, __delim))
-            __os << __escape;
-        __os << *__first;
-    }
-    __os << __delim;
-    return __os;
-}
-
-template <class _CharT, class _Traits, class _String>
-basic_istream<_CharT, _Traits> &
-__quoted_input ( basic_istream<_CharT, _Traits> &__is, _String & __string, _CharT __delim, _CharT __escape )
-{
-    __string.clear ();
-    _CharT __c;
-    __is >> __c;
-    if ( __is.fail ())
-        return __is;
-
-    if (!_Traits::eq (__c, __delim))    // no delimiter, read the whole string
-    {
-        __is.unget ();
-        __is >> __string;
-        return __is;
-    }
-
-    __save_flags<_CharT, _Traits> sf(__is);
-    noskipws (__is);
-    while (true)
-        {
-        __is >> __c;
-        if ( __is.fail ())
-            break;
-        if (_Traits::eq (__c, __escape))
-        {
-            __is >> __c;
-            if ( __is.fail ())
-                break;
-        }
-        else if (_Traits::eq (__c, __delim))
-            break;
-        __string.push_back ( __c );
-        }
-    return __is;
-}
-
-
-template <class _CharT, class _Iter, class _Traits=char_traits<_CharT>>
-struct __quoted_output_proxy
-{
-    _Iter  __first;
-    _Iter  __last;
-    _CharT  __delim;
-    _CharT  __escape;
-
-    __quoted_output_proxy(_Iter __f, _Iter __l, _CharT __d, _CharT __e)
-    : __first(__f), __last(__l), __delim(__d), __escape(__e) {}
-    //  This would be a nice place for a string_ref 
-};
-
-template <class _CharT, class _Traits, class _Iter>
-basic_ostream<_CharT, _Traits>& operator<<(
-         basic_ostream<_CharT, _Traits>& __os, 
-         const __quoted_output_proxy<_CharT, _Iter, _Traits> & __proxy)
-{
-    return __quoted_output (__os, __proxy.__first, __proxy.__last, __proxy.__delim, __proxy.__escape);
-}
-
-template <class _CharT, class _Traits, class _Allocator>
-struct __quoted_proxy
-{
-    basic_string<_CharT, _Traits, _Allocator> &__string;
-    _CharT  __delim;
-    _CharT  __escape;
-
-    __quoted_proxy(basic_string<_CharT, _Traits, _Allocator> &__s, _CharT __d, _CharT __e)
-    : __string(__s), __delim(__d), __escape(__e) {}
-};
-
-template <class _CharT, class _Traits, class _Allocator>
-_LIBCPP_INLINE_VISIBILITY
-basic_ostream<_CharT, _Traits>& operator<<(
-        basic_ostream<_CharT, _Traits>& __os, 
-        const __quoted_proxy<_CharT, _Traits, _Allocator> & __proxy)
-{
-    return __quoted_output (__os, __proxy.__string.cbegin (), __proxy.__string.cend (), __proxy.__delim, __proxy.__escape);
-}
-
-//  extractor for non-const basic_string& proxies
-template <class _CharT, class _Traits, class _Allocator>
-_LIBCPP_INLINE_VISIBILITY
-basic_istream<_CharT, _Traits>& operator>>(
-        basic_istream<_CharT, _Traits>& __is, 
-        const __quoted_proxy<_CharT, _Traits, _Allocator> & __proxy)
-{
-    return __quoted_input ( __is, __proxy.__string, __proxy.__delim, __proxy.__escape );
-}
-
-
-template <class _CharT>
-_LIBCPP_INLINE_VISIBILITY
-__quoted_output_proxy<_CharT, const _CharT *>
-quoted ( const _CharT *__s, _CharT __delim = _CharT('"'), _CharT __escape =_CharT('\\'))
-{
-    const _CharT *__end = __s;
-    while ( *__end ) ++__end;
-    return __quoted_output_proxy<_CharT, const _CharT *> ( __s, __end, __delim, __escape );
-}
-
-template <class _CharT, class _Traits, class _Allocator>
-_LIBCPP_INLINE_VISIBILITY
-__quoted_output_proxy<_CharT, typename basic_string <_CharT, _Traits, _Allocator>::const_iterator>
-quoted ( const basic_string <_CharT, _Traits, _Allocator> &__s, _CharT __delim = _CharT('"'), _CharT __escape=_CharT('\\'))
-{
-    return __quoted_output_proxy<_CharT, 
-            typename basic_string <_CharT, _Traits, _Allocator>::const_iterator> 
-                    ( __s.cbegin(), __s.cend (), __delim, __escape );
-}
-
-template <class _CharT, class _Traits, class _Allocator>
-__quoted_proxy<_CharT, _Traits, _Allocator>
-quoted ( basic_string <_CharT, _Traits, _Allocator> &__s, _CharT __delim = _CharT('"'), _CharT __escape=_CharT('\\'))
-{
-    return __quoted_proxy<_CharT, _Traits, _Allocator>( __s, __delim, __escape );
-}
-#endif
-
 _LIBCPP_END_NAMESPACE_STD

 #endif  // _LIBCPP_IOMANIP
--- a/include/ios
+++ b/include/ios
@@ -203,9 +203,9 @@ enum class io_errc
 };

 concept_map ErrorCodeEnum<io_errc> { };
-error_code make_error_code(io_errc e) noexcept; 
-error_condition make_error_condition(io_errc e) noexcept; 
-storage-class-specifier const error_category& iostream_category() noexcept;
+error_code make_error_code(io_errc e);
+error_condition make_error_condition(io_errc e);
+storage-class-specifier const error_category& iostream_category;

 }  // std

@@ -216,10 +216,6 @@ storage-class-specifier const error_category& iostream_category() noexcept;
 #include <__locale>
 #include <system_error>

-#if __has_feature(cxx_atomic)
-#include <atomic>     // for __xindex_
-#endif
-
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
 #endif
@@ -323,7 +319,7 @@ public:
    _LIBCPP_INLINE_VISIBILITY bool bad() const;

    _LIBCPP_INLINE_VISIBILITY iostate exceptions() const;
-    _LIBCPP_INLINE_VISIBILITY void exceptions(iostate __iostate);
+    _LIBCPP_INLINE_VISIBILITY void exceptions(iostate __except);

    void __set_badbit_and_consider_rethrow();
    void __set_failbit_and_consider_rethrow();
@@ -367,11 +363,7 @@ private:
    int*            __index_;
    size_t          __event_size_;
    size_t          __event_cap_;
-#if __has_feature(cxx_atomic)
-    static atomic<int> __xindex_;
-#else
    static int      __xindex_;
-#endif
    long*           __iarray_;
    size_t          __iarray_size_;
    size_t          __iarray_cap_;
@@ -388,26 +380,26 @@ _LIBCPP_DECLARE_STRONG_ENUM(io_errc)
 _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(io_errc)

 template <>
-struct _LIBCPP_TYPE_VIS_ONLY is_error_code_enum<io_errc> : public true_type { };
+struct _LIBCPP_TYPE_VIS is_error_code_enum<io_errc> : public true_type { };

 #ifdef _LIBCPP_HAS_NO_STRONG_ENUMS
 template <>
-struct _LIBCPP_TYPE_VIS_ONLY is_error_code_enum<io_errc::__lx> : public true_type { };
+struct _LIBCPP_TYPE_VIS is_error_code_enum<io_errc::__lx> : public true_type { };
 #endif

 _LIBCPP_FUNC_VIS
-const error_category& iostream_category() _NOEXCEPT;
+const error_category& iostream_category();

 inline _LIBCPP_INLINE_VISIBILITY
 error_code
-make_error_code(io_errc __e) _NOEXCEPT
+make_error_code(io_errc __e)
 {
    return error_code(static_cast<int>(__e), iostream_category());
 }

 inline _LIBCPP_INLINE_VISIBILITY
 error_condition
-make_error_condition(io_errc __e) _NOEXCEPT
+make_error_condition(io_errc __e)
 {
    return error_condition(static_cast<int>(__e), iostream_category());
 }
@@ -535,21 +527,21 @@ inline _LIBCPP_INLINE_VISIBILITY
 bool
 ios_base::eof() const
 {
-    return (__rdstate_ & eofbit) != 0;
+    return __rdstate_ & eofbit;
 }

 inline _LIBCPP_INLINE_VISIBILITY
 bool
 ios_base::fail() const
 {
-    return (__rdstate_ & (failbit | badbit)) != 0;
+    return __rdstate_ & (failbit | badbit);
 }

 inline _LIBCPP_INLINE_VISIBILITY
 bool
 ios_base::bad() const
 {
-    return (__rdstate_ & badbit) != 0;
+    return __rdstate_ & badbit;
 }

 inline _LIBCPP_INLINE_VISIBILITY
@@ -561,14 +553,14 @@ ios_base::exceptions() const

 inline _LIBCPP_INLINE_VISIBILITY
 void
-ios_base::exceptions(iostate __iostate)
+ios_base::exceptions(iostate __except)
 {
-    __exceptions_ = __iostate;
+    __exceptions_ = __except;
    clear(__rdstate_);
 }

 template <class _CharT, class _Traits>
-class _LIBCPP_TYPE_VIS_ONLY basic_ios
+class _LIBCPP_TYPE_VIS basic_ios
    : public ios_base
 {
 public:
@@ -593,7 +585,7 @@ public:
    _LIBCPP_ALWAYS_INLINE bool bad() const  {return ios_base::bad();}

    _LIBCPP_ALWAYS_INLINE iostate exceptions() const {return ios_base::exceptions();}
-    _LIBCPP_ALWAYS_INLINE void exceptions(iostate __iostate) {ios_base::exceptions(__iostate);}
+    _LIBCPP_ALWAYS_INLINE void exceptions(iostate __except) {ios_base::exceptions(__except);}

    // 27.5.4.1 Constructor/destructor:
    _LIBCPP_INLINE_VISIBILITY
@@ -991,33 +983,6 @@ defaultfloat(ios_base& __str)
    return __str;
 }

-template <class _CharT, class _Traits>
-class __save_flags
-{
-    typedef basic_ios<_CharT, _Traits> __stream_type;
-    typedef typename __stream_type::fmtflags fmtflags;
-
-    __stream_type& __stream_;
-    fmtflags       __fmtflags_;
-    _CharT         __fill_;
-
-    __save_flags(const __save_flags&);
-    __save_flags& operator=(const __save_flags&);
-public:
-    _LIBCPP_INLINE_VISIBILITY
-    explicit __save_flags(__stream_type& __stream)
-        : __stream_(__stream),
-          __fmtflags_(__stream.flags()),
-          __fill_(__stream.fill())
-        {}
-    _LIBCPP_INLINE_VISIBILITY
-    ~__save_flags()
-    {
-        __stream_.flags(__fmtflags_);
-        __stream_.fill(__fill_);
-    }
-};
-
 _LIBCPP_END_NAMESPACE_STD

 #endif  // _LIBCPP_IOS
--- a/include/iosfwd
+++ b/include/iosfwd
@@ -97,47 +97,47 @@ _LIBCPP_BEGIN_NAMESPACE_STD

 class _LIBCPP_TYPE_VIS ios_base;

-template<class _CharT>  struct _LIBCPP_TYPE_VIS_ONLY char_traits;
-template<class _Tp>     class _LIBCPP_TYPE_VIS_ONLY allocator;
+template<class _CharT>  struct _LIBCPP_TYPE_VIS char_traits;
+template<class _Tp>     class _LIBCPP_TYPE_VIS allocator;

 template <class _CharT, class _Traits = char_traits<_CharT> >
-    class _LIBCPP_TYPE_VIS_ONLY basic_ios;
+    class _LIBCPP_TYPE_VIS basic_ios;

 template <class _CharT, class _Traits = char_traits<_CharT> >
-    class _LIBCPP_TYPE_VIS_ONLY basic_streambuf;
+    class _LIBCPP_TYPE_VIS basic_streambuf;
 template <class _CharT, class _Traits = char_traits<_CharT> >
-    class _LIBCPP_TYPE_VIS_ONLY basic_istream;
+    class _LIBCPP_TYPE_VIS basic_istream;
 template <class _CharT, class _Traits = char_traits<_CharT> >
-    class _LIBCPP_TYPE_VIS_ONLY basic_ostream;
+    class _LIBCPP_TYPE_VIS basic_ostream;
 template <class _CharT, class _Traits = char_traits<_CharT> >
-    class _LIBCPP_TYPE_VIS_ONLY basic_iostream;
+    class _LIBCPP_TYPE_VIS basic_iostream;

 template <class _CharT, class _Traits = char_traits<_CharT>,
          class _Allocator = allocator<_CharT> >
-    class _LIBCPP_TYPE_VIS_ONLY basic_stringbuf;
+    class _LIBCPP_TYPE_VIS basic_stringbuf;
 template <class _CharT, class _Traits = char_traits<_CharT>,
          class _Allocator = allocator<_CharT> >
-    class _LIBCPP_TYPE_VIS_ONLY basic_istringstream;
+    class _LIBCPP_TYPE_VIS basic_istringstream;
 template <class _CharT, class _Traits = char_traits<_CharT>,
          class _Allocator = allocator<_CharT> >
-    class _LIBCPP_TYPE_VIS_ONLY basic_ostringstream;
+    class _LIBCPP_TYPE_VIS basic_ostringstream;
 template <class _CharT, class _Traits = char_traits<_CharT>,
          class _Allocator = allocator<_CharT> >
-    class _LIBCPP_TYPE_VIS_ONLY basic_stringstream;
+    class _LIBCPP_TYPE_VIS basic_stringstream;

 template <class _CharT, class _Traits = char_traits<_CharT> >
-    class _LIBCPP_TYPE_VIS_ONLY basic_filebuf;
+    class _LIBCPP_TYPE_VIS basic_filebuf;
 template <class _CharT, class _Traits = char_traits<_CharT> >
-    class _LIBCPP_TYPE_VIS_ONLY basic_ifstream;
+    class _LIBCPP_TYPE_VIS basic_ifstream;
 template <class _CharT, class _Traits = char_traits<_CharT> >
-    class _LIBCPP_TYPE_VIS_ONLY basic_ofstream;
+    class _LIBCPP_TYPE_VIS basic_ofstream;
 template <class _CharT, class _Traits = char_traits<_CharT> >
-    class _LIBCPP_TYPE_VIS_ONLY basic_fstream;
+    class _LIBCPP_TYPE_VIS basic_fstream;

 template <class _CharT, class _Traits = char_traits<_CharT> >
-    class _LIBCPP_TYPE_VIS_ONLY istreambuf_iterator;
+    class _LIBCPP_TYPE_VIS istreambuf_iterator;
 template <class _CharT, class _Traits = char_traits<_CharT> >
-    class _LIBCPP_TYPE_VIS_ONLY ostreambuf_iterator;
+    class _LIBCPP_TYPE_VIS ostreambuf_iterator;

 typedef basic_ios<char>              ios;
 typedef basic_ios<wchar_t>           wios;
@@ -172,7 +172,7 @@ typedef basic_ifstream<wchar_t>      wifstream;
 typedef basic_ofstream<wchar_t>      wofstream;
 typedef basic_fstream<wchar_t>       wfstream;

-template <class _State>             class _LIBCPP_TYPE_VIS_ONLY fpos;
+template <class _State>             class _LIBCPP_TYPE_VIS fpos;
 typedef fpos<mbstate_t>    streampos;
 typedef fpos<mbstate_t>    wstreampos;
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
@@ -185,7 +185,7 @@ typedef long long streamoff;        // for char_traits in <string>
 template <class _CharT,             // for <stdexcept>
          class _Traits = char_traits<_CharT>,
          class _Allocator = allocator<_CharT> >
-    class _LIBCPP_TYPE_VIS_ONLY basic_string;
+    class _LIBCPP_TYPE_VIS basic_string;
 typedef basic_string<char, char_traits<char>, allocator<char> > string;
 typedef basic_string<wchar_t, char_traits<wchar_t>, allocator<wchar_t> > wstring;

--- a/include/istream
+++ b/include/istream
@@ -164,7 +164,7 @@ template <class charT, class traits, class T>
 _LIBCPP_BEGIN_NAMESPACE_STD

 template <class _CharT, class _Traits>
-class _LIBCPP_TYPE_VIS_ONLY basic_istream
+class _LIBCPP_TYPE_VIS basic_istream
    : virtual public basic_ios<_CharT, _Traits>
 {
    streamsize __gc_;
@@ -194,7 +194,7 @@ protected:
 public:

    // 27.7.1.1.3 Prefix/suffix:
-    class _LIBCPP_TYPE_VIS_ONLY sentry;
+    class _LIBCPP_TYPE_VIS sentry;

    // 27.7.1.2 Formatted input:
    basic_istream& operator>>(basic_istream& (*__pf)(basic_istream&));
@@ -244,7 +244,7 @@ public:
 };

 template <class _CharT, class _Traits>
-class _LIBCPP_TYPE_VIS_ONLY basic_istream<_CharT, _Traits>::sentry
+class _LIBCPP_TYPE_VIS basic_istream<_CharT, _Traits>::sentry
 {
    bool __ok_;

@@ -1144,7 +1144,8 @@ basic_istream<_CharT, _Traits>::ignore(streamsize __n, int_type __dlm)
                       break;
                    }
                    ++__gc_;
-                    if (traits_type::eq_int_type(__i, __dlm))
+                    char_type __ch = traits_type::to_char_type(__i);
+                    if (traits_type::eq(__ch, static_cast<char_type>(__dlm)))
                        break;
                }
            }
@@ -1159,7 +1160,8 @@ basic_istream<_CharT, _Traits>::ignore(streamsize __n, int_type __dlm)
                       break;
                    }
                    ++__gc_;
-                    if (traits_type::eq_int_type(__i, __dlm))
+                    char_type __ch = traits_type::to_char_type(__i);
+                    if (traits_type::eq(__ch, static_cast<char_type>(__dlm)))
                        break;
                }
            }
@@ -1369,10 +1371,8 @@ basic_istream<_CharT, _Traits>::seekg(pos_type __pos)
        this->clear(this->rdstate() & ~ios_base::eofbit);
        sentry __sen(*this, true);
        if (__sen)
-        {
            if (this->rdbuf()->pubseekpos(__pos, ios_base::in) == pos_type(-1))
                this->setstate(ios_base::failbit);
-        }
 #ifndef _LIBCPP_NO_EXCEPTIONS
    }
    catch (...)
@@ -1393,10 +1393,7 @@ basic_istream<_CharT, _Traits>::seekg(off_type __off, ios_base::seekdir __dir)
 #endif  // _LIBCPP_NO_EXCEPTIONS
        sentry __sen(*this, true);
        if (__sen)
-        {
-            if (this->rdbuf()->pubseekoff(__off, __dir, ios_base::in) == pos_type(-1))
-                this->setstate(ios_base::failbit);
-        }
+            this->rdbuf()->pubseekoff(__off, __dir, ios_base::in);
 #ifndef _LIBCPP_NO_EXCEPTIONS
    }
    catch (...)
@@ -1456,7 +1453,7 @@ operator>>(basic_istream<_CharT, _Traits>&& __is, _Tp& __x)
 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES

 template <class _CharT, class _Traits>
-class _LIBCPP_TYPE_VIS_ONLY basic_iostream
+class _LIBCPP_TYPE_VIS basic_iostream
    : public basic_istream<_CharT, _Traits>,
      public basic_ostream<_CharT, _Traits>
 {
@@ -1707,9 +1704,9 @@ operator>>(basic_istream<_CharT, _Traits>& __is, bitset<_Size>& __x)
    return __is;
 }

-_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_TYPE_VIS basic_istream<char>)
-_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_TYPE_VIS basic_istream<wchar_t>)
-_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_TYPE_VIS basic_iostream<char>)
+_LIBCPP_EXTERN_TEMPLATE(class basic_istream<char>)
+_LIBCPP_EXTERN_TEMPLATE(class basic_istream<wchar_t>)
+_LIBCPP_EXTERN_TEMPLATE(class basic_iostream<char>)

 _LIBCPP_END_NAMESPACE_STD

--- a/include/iterator
+++ b/include/iterator
@@ -309,19 +309,6 @@ template <class C> auto end(const C& c) -> decltype(c.end());
 template <class T, size_t N> T* begin(T (&array)[N]);
 template <class T, size_t N> T* end(T (&array)[N]);

-template <class C> auto cbegin(const C& c) -> decltype(std::begin(c));        // C++14
-template <class C> auto cend(const C& c) -> decltype(std::end(c));            // C++14
-template <class C> auto rbegin(C& c) -> decltype(c.rbegin());                 // C++14
-template <class C> auto rbegin(const C& c) -> decltype(c.rbegin());           // C++14
-template <class C> auto rend(C& c) -> decltype(c.rend());                     // C++14
-template <class C> auto rend(const C& c) -> decltype(c.rend());               // C++14
-template <class E> reverse_iterator<const E*> rbegin(initializer_list<E> il); // C++14
-template <class E> reverse_iterator<const E*> rend(initializer_list<E> il);   // C++14
-template <class T, size_t N> reverse_iterator<T*> rbegin(T (&array)[N]);      // C++14
-template <class T, size_t N> reverse_iterator<T*> rend(T (&array)[N]);        // C++14
-template <class C> auto crbegin(const C& c) -> decltype(std::rbegin(c));      // C++14
-template <class C> auto crend(const C& c) -> decltype(std::rend(c));          // C++14
-
 }  // std

 */
@@ -330,15 +317,12 @@ template <class C> auto crend(const C& c) -> decltype(std::rend(c));          //
 #include <type_traits>
 #include <cstddef>
 #include <iosfwd>
-#include <initializer_list>
 #ifdef __APPLE__
 #include <Availability.h>
 #endif

 #ifdef _LIBCPP_DEBUG
-#   include <__debug>
-#else
-#   define _LIBCPP_ASSERT(x, m) ((void)0)
+#include <cassert>
 #endif

 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -347,11 +331,11 @@ template <class C> auto crend(const C& c) -> decltype(std::rend(c));          //

 _LIBCPP_BEGIN_NAMESPACE_STD

-struct _LIBCPP_TYPE_VIS_ONLY input_iterator_tag {};
-struct _LIBCPP_TYPE_VIS_ONLY output_iterator_tag {};
-struct _LIBCPP_TYPE_VIS_ONLY forward_iterator_tag       : public input_iterator_tag {};
-struct _LIBCPP_TYPE_VIS_ONLY bidirectional_iterator_tag : public forward_iterator_tag {};
-struct _LIBCPP_TYPE_VIS_ONLY random_access_iterator_tag : public bidirectional_iterator_tag {};
+struct _LIBCPP_TYPE_VIS input_iterator_tag {};
+struct _LIBCPP_TYPE_VIS output_iterator_tag {};
+struct _LIBCPP_TYPE_VIS forward_iterator_tag       : public input_iterator_tag {};
+struct _LIBCPP_TYPE_VIS bidirectional_iterator_tag : public forward_iterator_tag {};
+struct _LIBCPP_TYPE_VIS random_access_iterator_tag : public bidirectional_iterator_tag {};

 template <class _Tp>
 struct __has_iterator_category
@@ -394,11 +378,11 @@ struct __iterator_traits<_Iter, true>
 //    the client expects instead of failing at compile time.

 template <class _Iter>
-struct _LIBCPP_TYPE_VIS_ONLY iterator_traits
+struct _LIBCPP_TYPE_VIS iterator_traits
    : __iterator_traits<_Iter, __has_iterator_category<_Iter>::value> {};

 template<class _Tp>
-struct _LIBCPP_TYPE_VIS_ONLY iterator_traits<_Tp*>
+struct _LIBCPP_TYPE_VIS iterator_traits<_Tp*>
 {
    typedef ptrdiff_t difference_type;
    typedef typename remove_const<_Tp>::type value_type;
@@ -429,7 +413,7 @@ struct __is_random_access_iterator : public __has_iterator_category_convertible_

 template<class _Category, class _Tp, class _Distance = ptrdiff_t,
         class _Pointer = _Tp*, class _Reference = _Tp&>
-struct _LIBCPP_TYPE_VIS_ONLY iterator
+struct _LIBCPP_TYPE_VIS iterator
 {
    typedef _Tp        value_type;
    typedef _Distance  difference_type;
@@ -526,7 +510,7 @@ prev(_BidiretionalIter __x,
 }

 template <class _Iter>
-class _LIBCPP_TYPE_VIS_ONLY reverse_iterator
+class _LIBCPP_TYPE_VIS reverse_iterator
    : public iterator<typename iterator_traits<_Iter>::iterator_category,
                      typename iterator_traits<_Iter>::value_type,
                      typename iterator_traits<_Iter>::difference_type,
@@ -633,7 +617,7 @@ operator+(typename reverse_iterator<_Iter>::difference_type __n, const reverse_i
 }

 template <class _Container>
-class _LIBCPP_TYPE_VIS_ONLY back_insert_iterator
+class _LIBCPP_TYPE_VIS back_insert_iterator
    : public iterator<output_iterator_tag,
                      void,
                      void,
@@ -666,7 +650,7 @@ back_inserter(_Container& __x)
 }

 template <class _Container>
-class _LIBCPP_TYPE_VIS_ONLY front_insert_iterator
+class _LIBCPP_TYPE_VIS front_insert_iterator
    : public iterator<output_iterator_tag,
                      void,
                      void,
@@ -699,7 +683,7 @@ front_inserter(_Container& __x)
 }

 template <class _Container>
-class _LIBCPP_TYPE_VIS_ONLY insert_iterator
+class _LIBCPP_TYPE_VIS insert_iterator
    : public iterator<output_iterator_tag,
                      void,
                      void,
@@ -735,7 +719,7 @@ inserter(_Container& __x, typename _Container::iterator __i)

 template <class _Tp, class _CharT = char,
          class _Traits = char_traits<_CharT>, class _Distance = ptrdiff_t>
-class _LIBCPP_TYPE_VIS_ONLY istream_iterator
+class _LIBCPP_TYPE_VIS istream_iterator
    : public iterator<input_iterator_tag, _Tp, _Distance, const _Tp*, const _Tp&>
 {
 public:
@@ -774,7 +758,7 @@ public:
 };

 template <class _Tp, class _CharT = char, class _Traits = char_traits<_CharT> >
-class _LIBCPP_TYPE_VIS_ONLY ostream_iterator
+class _LIBCPP_TYPE_VIS ostream_iterator
    : public iterator<output_iterator_tag, void, void, void, void>
 {
 public:
@@ -803,7 +787,7 @@ public:
 };

 template<class _CharT, class _Traits>
-class _LIBCPP_TYPE_VIS_ONLY istreambuf_iterator
+class _LIBCPP_TYPE_VIS istreambuf_iterator
    : public iterator<input_iterator_tag, _CharT,
                      typename _Traits::off_type, _CharT*,
                      _CharT>
@@ -874,7 +858,7 @@ bool operator!=(const istreambuf_iterator<_CharT,_Traits>& __a,
                {return !__a.equal(__b);}

 template <class _CharT, class _Traits>
-class _LIBCPP_TYPE_VIS_ONLY ostreambuf_iterator
+class _LIBCPP_TYPE_VIS ostreambuf_iterator
    : public iterator<output_iterator_tag, void, void, void, void>
 {
 public:
@@ -915,7 +899,7 @@ public:
 };

 template <class _Iter>
-class _LIBCPP_TYPE_VIS_ONLY move_iterator
+class _LIBCPP_TYPE_VIS move_iterator
 {
 private:
    _Iter __i;
@@ -1030,7 +1014,7 @@ operator+(typename move_iterator<_Iter>::difference_type __n, const move_iterato
 template <class _Iter>
 inline _LIBCPP_INLINE_VISIBILITY
 move_iterator<_Iter>
-make_move_iterator(_Iter __i)
+make_move_iterator(const _Iter& __i)
 {
    return move_iterator<_Iter>(__i);
 }
@@ -1107,9 +1091,6 @@ private:
    iterator_type __i;
 public:
    _LIBCPP_INLINE_VISIBILITY __wrap_iter() _NOEXCEPT
-#if _LIBCPP_STD_VER > 11
-                : __i{}
-#endif
    {
 #if _LIBCPP_DEBUG_LEVEL >= 2
        __get_db()->__insert_i(this);
@@ -1154,14 +1135,7 @@ public:
 #endif
        return *__i;
    }
-    _LIBCPP_INLINE_VISIBILITY pointer  operator->() const _NOEXCEPT
-    {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-        _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
-                       "Attempted to dereference a non-dereferenceable iterator");
-#endif
-        return (pointer)&reinterpret_cast<const volatile char&>(*__i);
-    }
+    _LIBCPP_INLINE_VISIBILITY pointer  operator->() const _NOEXCEPT {return &(operator*());}
    _LIBCPP_INLINE_VISIBILITY __wrap_iter& operator++() _NOEXCEPT
    {
 #if _LIBCPP_DEBUG_LEVEL >= 2
@@ -1211,13 +1185,12 @@ public:
    _LIBCPP_INLINE_VISIBILITY iterator_type base() const _NOEXCEPT {return __i;}

 private:
+    _LIBCPP_INLINE_VISIBILITY __wrap_iter(iterator_type __x) _NOEXCEPT : __i(__x) {}
 #if _LIBCPP_DEBUG_LEVEL >= 2
    _LIBCPP_INLINE_VISIBILITY __wrap_iter(const void* __p, iterator_type __x) : __i(__x)
    {
        __get_db()->__insert_ic(this, __p);
    }
-#else
-    _LIBCPP_INLINE_VISIBILITY __wrap_iter(iterator_type __x) _NOEXCEPT : __i(__x) {}
 #endif

    template <class _Up> friend class __wrap_iter;
@@ -1284,6 +1257,10 @@ inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator==(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
 {
+#if _LIBCPP_DEBUG_LEVEL >= 2
+    _LIBCPP_ASSERT(__get_const_db()->__comparable(&__x, &__y),
+                   "Attempted to compare incomparable iterators");
+#endif
    return __x.base() == __y.base();
 }

@@ -1293,7 +1270,7 @@ bool
 operator<(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
 {
 #if _LIBCPP_DEBUG_LEVEL >= 2
-    _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y),
+    _LIBCPP_ASSERT(__get_const_db()->__comparable(&__x, &__y),
                   "Attempted to compare incomparable iterators");
 #endif
    return __x.base() < __y.base();
@@ -1369,7 +1346,7 @@ typename __wrap_iter<_Iter1>::difference_type
 operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
 {
 #if _LIBCPP_DEBUG_LEVEL >= 2
-    _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y),
+    _LIBCPP_ASSERT(__get_const_db()->__comparable(&__x, &__y),
                   "Attempted to subtract incompatible iterators");
 #endif
    return __x.base() - __y.base();
@@ -1385,22 +1362,422 @@ operator+(typename __wrap_iter<_Iter>::difference_type __n,
    return __x;
 }

-template <class _Tp, size_t _Np>
-inline _LIBCPP_INLINE_VISIBILITY
-_Tp*
-begin(_Tp (&__array)[_Np])
+#ifdef _LIBCPP_DEBUG
+
+// __debug_iter
+
+template <class _Container, class _Iter> class __debug_iter;
+
+template <class _Container, class _Iter1, class _Iter2>
+_LIBCPP_INLINE_VISIBILITY
+bool
+operator==(const __debug_iter<_Container, _Iter1>&, const __debug_iter<_Container, _Iter2>&);
+
+template <class _Container, class _Iter1, class _Iter2>
+_LIBCPP_INLINE_VISIBILITY
+bool
+operator<(const __debug_iter<_Container, _Iter1>&, const __debug_iter<_Container, _Iter2>&);
+
+template <class _Container, class _Iter1, class _Iter2>
+_LIBCPP_INLINE_VISIBILITY
+bool
+operator!=(const __debug_iter<_Container, _Iter1>&, const __debug_iter<_Container, _Iter2>&);
+
+template <class _Container, class _Iter1, class _Iter2>
+_LIBCPP_INLINE_VISIBILITY
+bool
+operator>(const __debug_iter<_Container, _Iter1>&, const __debug_iter<_Container, _Iter2>&);
+
+template <class _Container, class _Iter1, class _Iter2>
+_LIBCPP_INLINE_VISIBILITY
+bool
+operator>=(const __debug_iter<_Container, _Iter1>&, const __debug_iter<_Container, _Iter2>&);
+
+template <class _Container, class _Iter1, class _Iter2>
+_LIBCPP_INLINE_VISIBILITY
+bool
+operator<=(const __debug_iter<_Container, _Iter1>&, const __debug_iter<_Container, _Iter2>&);
+
+template <class _Container, class _Iter1, class _Iter2>
+_LIBCPP_INLINE_VISIBILITY
+typename __debug_iter<_Container, _Iter1>::difference_type
+operator-(const __debug_iter<_Container, _Iter1>&, const __debug_iter<_Container, _Iter2>&);
+
+template <class _Container, class _Iter>
+_LIBCPP_INLINE_VISIBILITY
+__debug_iter<_Container, _Iter>
+operator+(typename __debug_iter<_Container, _Iter>::difference_type, const __debug_iter<_Container, _Iter>&);
+
+template <class _Container, class _Iter>
+class __debug_iter
 {
-    return __array;
+public:
+    typedef _Iter                                                      iterator_type;
+    typedef _Container                                                 __container_type;
+    typedef typename iterator_traits<iterator_type>::iterator_category iterator_category;
+    typedef typename iterator_traits<iterator_type>::value_type        value_type;
+    typedef typename iterator_traits<iterator_type>::difference_type   difference_type;
+    typedef typename iterator_traits<iterator_type>::pointer           pointer;
+    typedef typename iterator_traits<iterator_type>::reference         reference;
+private:
+    iterator_type __i;
+    __debug_iter* __next;
+    __container_type* __cont;
+
+public:
+    _LIBCPP_INLINE_VISIBILITY __debug_iter() : __next(0), __cont(0) {}
+    _LIBCPP_INLINE_VISIBILITY __debug_iter(const __debug_iter& __x)
+        : __i(__x.base()), __next(0), __cont(0) {__set_owner(__x.__cont);}
+    __debug_iter& operator=(const __debug_iter& __x);
+    template <class _Up> _LIBCPP_INLINE_VISIBILITY __debug_iter(const __debug_iter<_Container, _Up>& __u,
+        typename enable_if<is_convertible<_Up, iterator_type>::value>::type* = 0)
+        : __i(__u.base()), __next(0), __cont(0) {__set_owner(__u.__cont);}
+    _LIBCPP_INLINE_VISIBILITY ~__debug_iter() {__remove_owner();}
+    _LIBCPP_INLINE_VISIBILITY reference operator*() const {assert(__is_deref()); return *__i;}
+    _LIBCPP_INLINE_VISIBILITY pointer  operator->() const {return &(operator*());}
+    _LIBCPP_INLINE_VISIBILITY __debug_iter& operator++() {assert(__can_increment()); ++__i; return *this;}
+    _LIBCPP_INLINE_VISIBILITY __debug_iter  operator++(int)
+        {__debug_iter __tmp(*this); operator++(); return __tmp;}
+    _LIBCPP_INLINE_VISIBILITY __debug_iter& operator--() {assert(__can_decrement()); --__i; return *this;}
+    _LIBCPP_INLINE_VISIBILITY __debug_iter  operator--(int)
+        {__debug_iter __tmp(*this); operator--(); return __tmp;}
+    _LIBCPP_INLINE_VISIBILITY __debug_iter  operator+ (difference_type __n) const
+        {__debug_iter __t(*this); __t += __n; return __t;}
+    __debug_iter& operator+=(difference_type __n);
+    _LIBCPP_INLINE_VISIBILITY __debug_iter  operator- (difference_type __n) const
+        {__debug_iter __t(*this); __t -= __n; return __t;}
+    _LIBCPP_INLINE_VISIBILITY __debug_iter& operator-=(difference_type __n)
+        {*this += -__n; return *this;}
+    _LIBCPP_INLINE_VISIBILITY reference        operator[](difference_type __n) const
+        {return *(*this + __n);}
+
+private:
+    _LIBCPP_INLINE_VISIBILITY __debug_iter(const __container_type* __c, iterator_type __x)
+        : __i(__x), __next(0), __cont(0) {__set_owner(__c);}
+    _LIBCPP_INLINE_VISIBILITY iterator_type base() const {return __i;}
+
+    void __set_owner(const __container_type* __c);
+    void __remove_owner();
+    static void __remove_all(__container_type* __c);
+    static void swap(__container_type* __x, __container_type* __y);
+
+    _LIBCPP_INLINE_VISIBILITY bool __is_deref() const
+        {return __is_deref(__is_random_access_iterator<iterator_type>());}
+    bool __is_deref(false_type) const;
+    bool __is_deref(true_type) const;
+    _LIBCPP_INLINE_VISIBILITY bool __can_decrement() const
+        {return __can_decrement(integral_constant<int, is_pointer<iterator_type>::value ? 2:
+                                                       __is_random_access_iterator<iterator_type>::value ? 1 : 0>());}
+    bool __can_decrement(integral_constant<int, 0>) const;
+    bool __can_decrement(integral_constant<int, 1>) const;
+    bool __can_decrement(integral_constant<int, 2>) const;
+    _LIBCPP_INLINE_VISIBILITY bool __can_increment() const
+        {return __can_increment(integral_constant<int, is_pointer<iterator_type>::value ? 2:
+                                                       __is_random_access_iterator<iterator_type>::value ? 1 : 0>());}
+    bool __can_increment(integral_constant<int, 0>) const;
+    bool __can_increment(integral_constant<int, 1>) const;
+    bool __can_increment(integral_constant<int, 2>) const;
+
+    _LIBCPP_INLINE_VISIBILITY bool __can_add(difference_type __n) const
+        {return __can_add(__n, is_pointer<iterator_type>());}
+    bool __can_add(difference_type __n, false_type) const;
+    bool __can_add(difference_type __n, true_type) const;
+
+    template <class _Cp, class _Up> friend class __debug_iter;
+    friend class _Container::__self;
+
+    template <class _Cp, class _Iter1, class _Iter2>
+    friend
+    bool
+    operator==(const __debug_iter<_Cp, _Iter1>&, const __debug_iter<_Cp, _Iter2>&);
+
+    template <class _Cp, class _Iter1, class _Iter2>
+    friend
+    bool
+    operator<(const __debug_iter<_Cp, _Iter1>&, const __debug_iter<_Cp, _Iter2>&);
+
+    template <class _Cp, class _Iter1, class _Iter2>
+    friend
+    bool
+    operator!=(const __debug_iter<_Cp, _Iter1>&, const __debug_iter<_Cp, _Iter2>&);
+
+    template <class _Cp, class _Iter1, class _Iter2>
+    friend
+    bool
+    operator>(const __debug_iter<_Cp, _Iter1>&, const __debug_iter<_Cp, _Iter2>&);
+
+    template <class _Cp, class _Iter1, class _Iter2>
+    friend
+    bool
+    operator>=(const __debug_iter<_Cp, _Iter1>&, const __debug_iter<_Cp, _Iter2>&);
+
+    template <class _Cp, class _Iter1, class _Iter2>
+    friend
+    bool
+    operator<=(const __debug_iter<_Cp, _Iter1>&, const __debug_iter<_Cp, _Iter2>&);
+
+    template <class _Cp, class _Iter1, class _Iter2>
+    friend
+    typename __debug_iter<_Cp, _Iter1>::difference_type
+    operator-(const __debug_iter<_Cp, _Iter1>&, const __debug_iter<_Cp, _Iter2>&);
+
+    template <class _Cp, class _Iter1>
+    friend
+    __debug_iter<_Cp, _Iter1>
+    operator+(typename __debug_iter<_Cp, _Iter1>::difference_type, const __debug_iter<_Cp, _Iter1>&);
+};
+
+template <class _Container, class _Iter>
+__debug_iter<_Container, _Iter>&
+__debug_iter<_Container, _Iter>::operator=(const __debug_iter& __x)
+{
+    if (this != &__x)
+    {
+        __remove_owner();
+        __i = __x.__i;
+        __set_owner(__x.__cont);
+    }
+    return *this;
 }

-template <class _Tp, size_t _Np>
-inline _LIBCPP_INLINE_VISIBILITY
-_Tp*
-end(_Tp (&__array)[_Np])
+template <class _Container, class _Iter>
+void
+__debug_iter<_Container, _Iter>::__set_owner(const __container_type* __c)
 {
-    return __array + _Np;
+    __cont = const_cast<__container_type*>(__c);
+    __debug_iter*& __head = __cont->__get_iterator_list(this);
+    __next = __head;
+    __head = this;
 }

+template <class _Container, class _Iter>
+void
+__debug_iter<_Container, _Iter>::__remove_owner()
+{
+    if (__cont)
+    {
+        __debug_iter*& __head = __cont->__get_iterator_list(this);
+        if (__head == this)
+            __head = __next;
+        else
+        {
+            __debug_iter* __prev = __head;
+            for (__debug_iter* __p = __head->__next; __p != this; __p = __p->__next)
+                __prev = __p;
+            __prev->__next = __next;
+        }
+        __cont = 0;
+    }
+}
+
+template <class _Container, class _Iter>
+void
+__debug_iter<_Container, _Iter>::__remove_all(__container_type* __c)
+{
+    __debug_iter*& __head = __c->__get_iterator_list((__debug_iter*)0);
+    __debug_iter* __p = __head;
+    __head = 0;
+    while (__p)
+    {
+        __p->__cont = 0;
+        __debug_iter* __n = __p->__next;
+        __p->__next = 0;
+        __p = __n;
+    }
+}
+
+template <class _Container, class _Iter>
+void
+__debug_iter<_Container, _Iter>::swap(__container_type* __x, __container_type* __y)
+{
+    __debug_iter*& __head_x = __x->__get_iterator_list((__debug_iter*)0);
+    __debug_iter*& __head_y = __y->__get_iterator_list((__debug_iter*)0);
+    __debug_iter* __p = __head_x;
+    __head_x = __head_y;
+    __head_y = __p;
+    for (__p = __head_x; __p; __p = __p->__next)
+        __p->__cont = __x;
+    for (__p = __head_y; __p; __p = __p->__next)
+        __p->__cont = __y;
+}
+
+template <class _Container, class _Iter>
+bool
+__debug_iter<_Container, _Iter>::__is_deref(false_type) const
+{
+    if (__cont == 0)
+        return false;
+    return __i != __cont->end().base();
+}
+
+template <class _Container, class _Iter>
+bool
+__debug_iter<_Container, _Iter>::__is_deref(true_type) const
+{
+    if (__cont == 0)
+        return false;
+    return __i < __cont->end().base();
+}
+
+template <class _Container, class _Iter>
+bool
+__debug_iter<_Container, _Iter>::__can_decrement(integral_constant<int, 0>) const
+{
+    if (__cont == 0)
+        return false;
+    return __i != __cont->begin().base();
+}
+
+template <class _Container, class _Iter>
+bool
+__debug_iter<_Container, _Iter>::__can_decrement(integral_constant<int, 1>) const
+{
+    if (__cont == 0)
+        return false;
+    iterator_type __b = __cont->begin().base();
+    return __b < __i && __i <= __b + __cont->size();
+}
+
+template <class _Container, class _Iter>
+bool
+__debug_iter<_Container, _Iter>::__can_decrement(integral_constant<int, 2>) const
+{
+    if (__cont == 0)
+        return false;
+    iterator_type __b = __cont->begin().base();
+    return __b < __i && __i <= __b + __cont->size();
+}
+
+template <class _Container, class _Iter>
+bool
+__debug_iter<_Container, _Iter>::__can_increment(integral_constant<int, 0>) const
+{
+    if (__cont == 0)
+        return false;
+    return __i != __cont->end().base();
+}
+
+template <class _Container, class _Iter>
+bool
+__debug_iter<_Container, _Iter>::__can_increment(integral_constant<int, 1>) const
+{
+    if (__cont == 0)
+        return false;
+    iterator_type __b = __cont->begin().base();
+    return __b <= __i && __i < __b + __cont->size();
+}
+
+template <class _Container, class _Iter>
+bool
+__debug_iter<_Container, _Iter>::__can_increment(integral_constant<int, 2>) const
+{
+    if (__cont == 0)
+        return false;
+    iterator_type __b = __cont->begin().base();
+    return __b <= __i && __i < __b + __cont->size();
+}
+
+template <class _Container, class _Iter>
+bool
+__debug_iter<_Container, _Iter>::__can_add(difference_type __n, false_type) const
+{
+    if (__cont == 0)
+        return false;
+    iterator_type __b = __cont->begin().base();
+    iterator_type __j = __i + __n;
+    return __b <= __j && __j <= __b + __cont->size();
+}
+
+template <class _Container, class _Iter>
+bool
+__debug_iter<_Container, _Iter>::__can_add(difference_type __n, true_type) const
+{
+    if (__cont == 0)
+        return false;
+    iterator_type __b = __cont->begin().base();
+    iterator_type __j = __i + __n;
+    return __b <= __j && __j <= __b + __cont->size();
+}
+
+template <class _Container, class _Iter>
+__debug_iter<_Container, _Iter>&
+__debug_iter<_Container, _Iter>::operator+=(difference_type __n)
+{
+    assert(__can_add(__n));
+    __i += __n;
+    return *this;
+}
+
+template <class _Container, class _Iter1, class _Iter2>
+inline _LIBCPP_INLINE_VISIBILITY
+bool
+operator==(const __debug_iter<_Container, _Iter1>& __x, const __debug_iter<_Container, _Iter2>& __y)
+{
+    assert(__x.__cont && __x.__cont == __y.__cont);
+    return __x.base() == __y.base();
+}
+
+template <class _Container, class _Iter1, class _Iter2>
+inline _LIBCPP_INLINE_VISIBILITY
+bool
+operator!=(const __debug_iter<_Container, _Iter1>& __x, const __debug_iter<_Container, _Iter2>& __y)
+{
+    return !(__x == __y);
+}
+
+template <class _Container, class _Iter1, class _Iter2>
+inline _LIBCPP_INLINE_VISIBILITY
+bool
+operator<(const __debug_iter<_Container, _Iter1>& __x, const __debug_iter<_Container, _Iter2>& __y)
+{
+    assert(__x.__cont && __x.__cont == __y.__cont);
+    return __x.base() < __y.base();
+}
+
+template <class _Container, class _Iter1, class _Iter2>
+inline _LIBCPP_INLINE_VISIBILITY
+bool
+operator>(const __debug_iter<_Container, _Iter1>& __x, const __debug_iter<_Container, _Iter2>& __y)
+{
+    return __y < __x;
+}
+
+template <class _Container, class _Iter1, class _Iter2>
+inline _LIBCPP_INLINE_VISIBILITY
+bool
+operator>=(const __debug_iter<_Container, _Iter1>& __x, const __debug_iter<_Container, _Iter2>& __y)
+{
+    return !(__x < __y);
+}
+
+template <class _Container, class _Iter1, class _Iter2>
+inline _LIBCPP_INLINE_VISIBILITY
+bool
+operator<=(const __debug_iter<_Container, _Iter1>& __x, const __debug_iter<_Container, _Iter2>& __y)
+{
+    return !(__y < __x);
+}
+
+template <class _Container, class _Iter1, class _Iter2>
+inline _LIBCPP_INLINE_VISIBILITY
+typename __debug_iter<_Container, _Iter1>::difference_type
+operator-(const __debug_iter<_Container, _Iter1>& __x, const __debug_iter<_Container, _Iter2>& __y)
+{
+    assert(__x.__cont && __x.__cont == __y.__cont);
+    return __x.base() - __y.base();
+}
+
+template <class _Container, class _Iter>
+inline _LIBCPP_INLINE_VISIBILITY
+__debug_iter<_Container, _Iter>
+operator+(typename __debug_iter<_Container, _Iter>::difference_type __n,
+          const __debug_iter<_Container, _Iter>& __x)
+{
+    return __x + __n;
+}
+
+#endif  // _LIBCPP_DEBUG
+
 #if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_TRAILING_RETURN)

 template <class _Cp>
@@ -1435,95 +1812,6 @@ end(const _Cp& __c) -> decltype(__c.end())
    return __c.end();
 }

-#if _LIBCPP_STD_VER > 11
-
-template <class _Tp, size_t _Np>
-inline _LIBCPP_INLINE_VISIBILITY
-reverse_iterator<_Tp*> rbegin(_Tp (&__array)[_Np])
-{
-    return reverse_iterator<_Tp*>(__array + _Np);
-}
-
-template <class _Tp, size_t _Np>
-inline _LIBCPP_INLINE_VISIBILITY
-reverse_iterator<_Tp*> rend(_Tp (&__array)[_Np])
-{
-    return reverse_iterator<_Tp*>(__array);
-}
-
-template <class _Ep>
-inline _LIBCPP_INLINE_VISIBILITY
-reverse_iterator<const _Ep*> rbegin(initializer_list<_Ep> __il)
-{
-    return reverse_iterator<const _Ep*>(__il.end());
-}
-
-template <class _Ep>
-inline _LIBCPP_INLINE_VISIBILITY
-reverse_iterator<const _Ep*> rend(initializer_list<_Ep> __il)
-{
-    return reverse_iterator<const _Ep*>(__il.begin());
-}
-
-template <class _Cp>
-inline _LIBCPP_INLINE_VISIBILITY
-auto cbegin(const _Cp& __c) -> decltype(begin(__c))
-{
-    return _VSTD::begin(__c);
-}
-
-template <class _Cp>
-inline _LIBCPP_INLINE_VISIBILITY
-auto cend(const _Cp& __c) -> decltype(end(__c))
-{
-    return _VSTD::end(__c);
-}
-
-template <class _Cp>
-inline _LIBCPP_INLINE_VISIBILITY
-auto rbegin(_Cp& __c) -> decltype(__c.rbegin())
-{
-    return __c.rbegin();
-}
-
-template <class _Cp>
-inline _LIBCPP_INLINE_VISIBILITY
-auto rbegin(const _Cp& __c) -> decltype(__c.rbegin())
-{
-    return __c.rbegin();
-}
-
-template <class _Cp>
-inline _LIBCPP_INLINE_VISIBILITY
-auto rend(_Cp& __c) -> decltype(__c.rend())
-{
-    return __c.rend();
-}
-
-template <class _Cp>
-inline _LIBCPP_INLINE_VISIBILITY
-auto rend(const _Cp& __c) -> decltype(__c.rend())
-{
-    return __c.rend();
-}
-
-template <class _Cp>
-inline _LIBCPP_INLINE_VISIBILITY
-auto crbegin(const _Cp& __c) -> decltype(rbegin(__c))
-{
-    return rbegin(__c);
-}
-
-template <class _Cp>
-inline _LIBCPP_INLINE_VISIBILITY
-auto crend(const _Cp& __c) -> decltype(rend(__c))
-{
-    return rend(__c);
-}
-
-#endif
-
-
 #else  // !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_TRAILING_RETURN)

 template <class _Cp>
@@ -1560,6 +1848,22 @@ end(const _Cp& __c)

 #endif  // !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_TRAILING_RETURN)

+template <class _Tp, size_t _Np>
+inline _LIBCPP_INLINE_VISIBILITY
+_Tp*
+begin(_Tp (&__array)[_Np])
+{
+    return __array;
+}
+
+template <class _Tp, size_t _Np>
+inline _LIBCPP_INLINE_VISIBILITY
+_Tp*
+end(_Tp (&__array)[_Np])
+{
+    return __array + _Np;
+}
+
 _LIBCPP_END_NAMESPACE_STD

 #endif  // _LIBCPP_ITERATOR
--- a/include/limits
+++ b/include/limits
@@ -111,13 +111,9 @@ template<> class numeric_limits<cv long double>;

 #include <__undef_min_max>

-#if defined(_LIBCPP_MSVCRT)
+#if defined(_MSC_VER)
 #include "support/win32/limits_win32.h"
-#endif // _LIBCPP_MSVCRT
-
-#if defined(__IBMCPP__)
-#include "support/ibm/limits.h"
-#endif // __IBMCPP__
+#endif // _MSC_VER

 _LIBCPP_BEGIN_NAMESPACE_STD

@@ -437,7 +433,7 @@ protected:
 };

 template <class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY numeric_limits
+class _LIBCPP_TYPE_VIS numeric_limits
    : private __libcpp_numeric_limits<typename remove_cv<_Tp>::type>
 {
    typedef __libcpp_numeric_limits<typename remove_cv<_Tp>::type> __base;
@@ -530,7 +526,7 @@ template <class _Tp>
    _LIBCPP_CONSTEXPR const float_round_style numeric_limits<_Tp>::round_style;

 template <class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY numeric_limits<const _Tp>
+class _LIBCPP_TYPE_VIS numeric_limits<const _Tp>
    : private numeric_limits<_Tp>
 {
    typedef numeric_limits<_Tp> __base;
@@ -623,7 +619,7 @@ template <class _Tp>
    _LIBCPP_CONSTEXPR const float_round_style numeric_limits<const _Tp>::round_style;

 template <class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY numeric_limits<volatile _Tp>
+class _LIBCPP_TYPE_VIS numeric_limits<volatile _Tp>
    : private numeric_limits<_Tp>
 {
    typedef numeric_limits<_Tp> __base;
@@ -716,7 +712,7 @@ template <class _Tp>
    _LIBCPP_CONSTEXPR const float_round_style numeric_limits<volatile _Tp>::round_style;

 template <class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY numeric_limits<const volatile _Tp>
+class _LIBCPP_TYPE_VIS numeric_limits<const volatile _Tp>
    : private numeric_limits<_Tp>
 {
    typedef numeric_limits<_Tp> __base;
--- a/include/list
+++ b/include/list
@@ -40,7 +40,6 @@ public:
        noexcept(is_nothrow_default_constructible<allocator_type>::value);
    explicit list(const allocator_type& a);
    explicit list(size_type n);
-    explicit list(size_type n, const allocator_type& a); // C++14
    list(size_type n, const value_type& value);
    list(size_type n, const value_type& value, const allocator_type& a);
    template <class Iter>
@@ -179,12 +178,6 @@ template <class T, class Alloc>

 #include <__undef_min_max>

-#ifdef _LIBCPP_DEBUG
-#   include <__debug>
-#else
-#   define _LIBCPP_ASSERT(x, m) ((void)0)
-#endif
-
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
 #endif
@@ -203,20 +196,13 @@ struct __list_node_base
        rebind<__list_node<_Tp, _VoidPtr> >::other pointer;
 #endif

-    typedef typename pointer_traits<_VoidPtr>::template
-#ifndef _LIBCPP_HAS_NO_TEMPLATE_ALIASES
-        rebind<__list_node_base> __base_pointer;
-#else
-        rebind<__list_node_base>::other __base_pointer;
-#endif
-
    pointer __prev_;
    pointer __next_;

    _LIBCPP_INLINE_VISIBILITY
    __list_node_base()
-        : __prev_(static_cast<pointer>(pointer_traits<__base_pointer>::pointer_to(*this))),
-          __next_(static_cast<pointer>(pointer_traits<__base_pointer>::pointer_to(*this)))
+        : __prev_(static_cast<pointer>(this)),
+          __next_(static_cast<pointer>(this))
          {}
 };

@@ -227,12 +213,12 @@ struct __list_node
    _Tp __value_;
 };

-template <class _Tp, class _Alloc> class _LIBCPP_TYPE_VIS_ONLY list;
+template <class _Tp, class _Alloc> class _LIBCPP_TYPE_VIS list;
 template <class _Tp, class _Alloc> class __list_imp;
-template <class _Tp, class _VoidPtr> class _LIBCPP_TYPE_VIS_ONLY __list_const_iterator;
+template <class _Tp, class _VoidPtr> class _LIBCPP_TYPE_VIS __list_const_iterator;

 template <class _Tp, class _VoidPtr>
-class _LIBCPP_TYPE_VIS_ONLY __list_iterator
+class _LIBCPP_TYPE_VIS __list_iterator
 {
    typedef typename pointer_traits<_VoidPtr>::template
 #ifndef _LIBCPP_HAS_NO_TEMPLATE_ALIASES
@@ -274,7 +260,7 @@ public:
    typedef typename pointer_traits<pointer>::difference_type difference_type;

    _LIBCPP_INLINE_VISIBILITY
-    __list_iterator() _NOEXCEPT : __ptr_(nullptr)
+    __list_iterator() _NOEXCEPT
    {
 #if _LIBCPP_DEBUG_LEVEL >= 2
        __get_db()->__insert_i(this);
@@ -319,14 +305,7 @@ public:
        return __ptr_->__value_;
    }
    _LIBCPP_INLINE_VISIBILITY
-    pointer operator->() const
-    {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-        _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
-                       "Attempted to dereference a non-dereferenceable list::iterator");
-#endif
-        return pointer_traits<pointer>::pointer_to(__ptr_->__value_);
-    }
+    pointer operator->() const {return &(operator*());}

    _LIBCPP_INLINE_VISIBILITY
    __list_iterator& operator++()
@@ -357,6 +336,10 @@ public:
    friend _LIBCPP_INLINE_VISIBILITY
    bool operator==(const __list_iterator& __x, const __list_iterator& __y)
    {
+#if _LIBCPP_DEBUG_LEVEL >= 2
+        _LIBCPP_ASSERT(__get_const_db()->__comparable(&__x, &__y),
+                       "Attempted to compare non-comparable list::iterator");
+#endif
        return __x.__ptr_ == __y.__ptr_;
    }
    friend _LIBCPP_INLINE_VISIBILITY
@@ -365,13 +348,13 @@ public:
 };

 template <class _Tp, class _VoidPtr>
-class _LIBCPP_TYPE_VIS_ONLY __list_const_iterator
+class _LIBCPP_TYPE_VIS __list_const_iterator
 {
    typedef typename pointer_traits<_VoidPtr>::template
 #ifndef _LIBCPP_HAS_NO_TEMPLATE_ALIASES
-        rebind<__list_node<_Tp, _VoidPtr> > __node_pointer;
+        rebind<const __list_node<_Tp, _VoidPtr> > __node_pointer;
 #else
-        rebind<__list_node<_Tp, _VoidPtr> >::other __node_pointer;
+        rebind<const __list_node<_Tp, _VoidPtr> >::other __node_pointer;
 #endif

    __node_pointer __ptr_;
@@ -404,7 +387,7 @@ public:
    typedef typename pointer_traits<pointer>::difference_type difference_type;

    _LIBCPP_INLINE_VISIBILITY
-    __list_const_iterator() _NOEXCEPT : __ptr_(nullptr)
+    __list_const_iterator() _NOEXCEPT
    {
 #if _LIBCPP_DEBUG_LEVEL >= 2
        __get_db()->__insert_i(this);
@@ -456,14 +439,7 @@ public:
        return __ptr_->__value_;
    }
    _LIBCPP_INLINE_VISIBILITY
-    pointer operator->() const
-    {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-        _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
-                       "Attempted to dereference a non-dereferenceable list::iterator");
-#endif
-        return pointer_traits<pointer>::pointer_to(__ptr_->__value_);
-    }
+    pointer operator->() const {return &(operator*());}

    _LIBCPP_INLINE_VISIBILITY
    __list_const_iterator& operator++()
@@ -494,6 +470,10 @@ public:
    friend _LIBCPP_INLINE_VISIBILITY
    bool operator==(const __list_const_iterator& __x, const __list_const_iterator& __y)
    {
+#if _LIBCPP_DEBUG_LEVEL >= 2
+        _LIBCPP_ASSERT(__get_const_db()->__comparable(&__x, &__y),
+                       "Attempted to compare non-comparable list::const_iterator");
+#endif
        return __x.__ptr_ == __y.__ptr_;
    }
    friend _LIBCPP_INLINE_VISIBILITY
@@ -525,20 +505,11 @@ protected:
                                                                     __node_allocator;
    typedef allocator_traits<__node_allocator>                       __node_alloc_traits;
    typedef typename __node_alloc_traits::pointer                    __node_pointer;
-    typedef typename __node_alloc_traits::pointer                    __node_const_pointer;
+    typedef typename __node_alloc_traits::const_pointer              __node_const_pointer;
    typedef typename __alloc_traits::pointer                         pointer;
    typedef typename __alloc_traits::const_pointer                   const_pointer;
    typedef typename __alloc_traits::difference_type                 difference_type;

-    typedef typename __alloc_traits::template
-#ifndef _LIBCPP_HAS_NO_TEMPLATE_ALIASES
-                rebind_alloc<__node_base>
-#else
-                rebind_alloc<__node_base>::other
-#endif
-                                                                     __node_base_allocator;
-    typedef typename allocator_traits<__node_base_allocator>::pointer __node_base_pointer;
-
    __node_base __end_;
    __compressed_pair<size_type, __node_allocator> __size_alloc_;

@@ -554,7 +525,7 @@ protected:
    const __node_allocator& __node_alloc() const _NOEXCEPT
        {return __size_alloc_.second();}

-    static void __unlink_nodes(__node_pointer __f, __node_pointer __l) _NOEXCEPT;
+    static void __unlink_nodes(__node_base& __f, __node_base& __l) _NOEXCEPT;

    __list_imp()
        _NOEXCEPT_(is_nothrow_default_constructible<__node_allocator>::value);
@@ -586,22 +557,18 @@ protected:
    iterator end() _NOEXCEPT
    {
 #if _LIBCPP_DEBUG_LEVEL >= 2
-        return iterator(static_cast<__node_pointer>(
-                pointer_traits<__node_base_pointer>::pointer_to(__end_)), this);
+        return iterator(static_cast<__node_pointer>(&__end_), this);
 #else
-        return iterator(static_cast<__node_pointer>(
-                      pointer_traits<__node_base_pointer>::pointer_to(__end_)));
+        return iterator(static_cast<__node_pointer>(&__end_));
 #endif
    }
    _LIBCPP_INLINE_VISIBILITY
    const_iterator end() const _NOEXCEPT
    {
 #if _LIBCPP_DEBUG_LEVEL >= 2
-        return const_iterator(static_cast<__node_const_pointer>(
-        pointer_traits<__node_base_pointer>::pointer_to(const_cast<__node_base&>(__end_))), this);
+        return const_iterator(static_cast<__node_const_pointer>(&__end_), this);
 #else
-        return const_iterator(static_cast<__node_const_pointer>(
-        pointer_traits<__node_base_pointer>::pointer_to(const_cast<__node_base&>(__end_))));
+        return const_iterator(static_cast<__node_const_pointer>(&__end_));
 #endif
    }

@@ -670,11 +637,11 @@ private:
 template <class _Tp, class _Alloc>
 inline _LIBCPP_INLINE_VISIBILITY
 void
-__list_imp<_Tp, _Alloc>::__unlink_nodes(__node_pointer __f, __node_pointer __l)
+__list_imp<_Tp, _Alloc>::__unlink_nodes(__node_base& __f, __node_base& __l)
    _NOEXCEPT
 {
-    __f->__prev_->__next_ = __l->__next_;
-    __l->__next_->__prev_ = __f->__prev_;
+    __f.__prev_->__next_ = __l.__next_;
+    __l.__next_->__prev_ = __f.__prev_;
 }

 template <class _Tp, class _Alloc>
@@ -709,16 +676,15 @@ __list_imp<_Tp, _Alloc>::clear() _NOEXCEPT
    {
        __node_allocator& __na = __node_alloc();
        __node_pointer __f = __end_.__next_;
-        __node_pointer __l = static_cast<__node_pointer>(
-                       pointer_traits<__node_base_pointer>::pointer_to(__end_));
-        __unlink_nodes(__f, __l->__prev_);
+        __node_pointer __l = static_cast<__node_pointer>(&__end_);
+        __unlink_nodes(*__f, *__l->__prev_);
        __sz() = 0;
        while (__f != __l)
        {
-            __node_pointer __n = __f;
+            __node& __n = *__f;
            __f = __f->__next_;
-            __node_alloc_traits::destroy(__na, _VSTD::addressof(__n->__value_));
-            __node_alloc_traits::deallocate(__na, __n, 1);
+            __node_alloc_traits::destroy(__na, _VSTD::addressof(__n.__value_));
+            __node_alloc_traits::deallocate(__na, _VSTD::addressof(__n), 1);
        }
 #if _LIBCPP_DEBUG_LEVEL >= 2
        __c_node* __c = __get_db()->__find_c_and_lock(this);
@@ -753,20 +719,16 @@ __list_imp<_Tp, _Alloc>::swap(__list_imp& __c)
    swap(__sz(), __c.__sz());
    swap(__end_, __c.__end_);
    if (__sz() == 0)
-        __end_.__next_ = __end_.__prev_ = static_cast<__node_pointer>(
-                       pointer_traits<__node_base_pointer>::pointer_to(__end_));
+        __end_.__next_ = __end_.__prev_ = &static_cast<__node&>(__end_);
    else
        __end_.__prev_->__next_ = __end_.__next_->__prev_
-                                = static_cast<__node_pointer>(
-                       pointer_traits<__node_base_pointer>::pointer_to(__end_));
+                                = &static_cast<__node&>(__end_);
    if (__c.__sz() == 0)
        __c.__end_.__next_ = __c.__end_.__prev_
-                           = static_cast<__node_pointer>(
-                       pointer_traits<__node_base_pointer>::pointer_to(__c.__end_));
+                           = &static_cast<__node&>(__c.__end_);
    else
        __c.__end_.__prev_->__next_ = __c.__end_.__next_->__prev_
-                                    = static_cast<__node_pointer>(
-                       pointer_traits<__node_base_pointer>::pointer_to(__c.__end_));
+                                    = &static_cast<__node&>(__c.__end_);
 #if _LIBCPP_DEBUG_LEVEL >= 2
    __libcpp_db* __db = __get_db();
    __c_node* __cn1 = __db->__find_c_and_lock(this);
@@ -778,8 +740,7 @@ __list_imp<_Tp, _Alloc>::swap(__list_imp& __c)
    {
        --__p;
        const_iterator* __i = static_cast<const_iterator*>((*__p)->__i_);
-        if (__i->__ptr_ == static_cast<__node_pointer>(
-                       pointer_traits<__node_base_pointer>::pointer_to(__c.__end_)))
+        if (__i->__ptr_ == static_cast<__node_pointer>(&__c.__end_))
        {
            __cn2->__add(*__p);
            if (--__cn1->end_ != __p)
@@ -792,8 +753,7 @@ __list_imp<_Tp, _Alloc>::swap(__list_imp& __c)
    {
        --__p;
        const_iterator* __i = static_cast<const_iterator*>((*__p)->__i_);
-        if (__i->__ptr_ == static_cast<__node_pointer>(
-                       pointer_traits<__node_base_pointer>::pointer_to(__end_)))
+        if (__i->__ptr_ == static_cast<__node_pointer>(&__end_))
        {
            __cn1->__add(*__p);
            if (--__cn2->end_ != __p)
@@ -807,7 +767,7 @@ __list_imp<_Tp, _Alloc>::swap(__list_imp& __c)
 }

 template <class _Tp, class _Alloc = allocator<_Tp> >
-class _LIBCPP_TYPE_VIS_ONLY list
+class _LIBCPP_TYPE_VIS list
    : private __list_imp<_Tp, _Alloc>
 {
    typedef __list_imp<_Tp, _Alloc> base;
@@ -815,8 +775,6 @@ class _LIBCPP_TYPE_VIS_ONLY list
    typedef typename base::__node_allocator    __node_allocator;
    typedef typename base::__node_pointer      __node_pointer;
    typedef typename base::__node_alloc_traits __node_alloc_traits;
-    typedef typename base::__node_base         __node_base;
-    typedef typename base::__node_base_pointer __node_base_pointer;

 public:
    typedef _Tp                                      value_type;
@@ -843,16 +801,13 @@ public:
 #endif
    }
    _LIBCPP_INLINE_VISIBILITY
-    explicit list(const allocator_type& __a) : base(__a)
+    list(const allocator_type& __a) : base(__a)
    {
 #if _LIBCPP_DEBUG_LEVEL >= 2
        __get_db()->__insert_c(this);
 #endif
    }
-    explicit list(size_type __n);
-#if _LIBCPP_STD_VER > 11
-    explicit list(size_type __n, const allocator_type& __a);
-#endif
+    list(size_type __n);
    list(size_type __n, const value_type& __x);
    list(size_type __n, const value_type& __x, const allocator_type& __a);
    template <class _InpIter>
@@ -1059,7 +1014,7 @@ public:
 #endif  // _LIBCPP_DEBUG_LEVEL >= 2

 private:
-    static void __link_nodes(__node_pointer __p, __node_pointer __f, __node_pointer __l);
+    static void __link_nodes(__node& __p, __node& __f, __node& __l);
    iterator __iterator(size_type __n);
    template <class _Comp>
        static iterator __sort(iterator __f1, iterator __e2, size_type __n, _Comp& __comp);
@@ -1073,12 +1028,12 @@ private:
 template <class _Tp, class _Alloc>
 inline _LIBCPP_INLINE_VISIBILITY
 void
-list<_Tp, _Alloc>::__link_nodes(__node_pointer __p, __node_pointer __f, __node_pointer __l)
+list<_Tp, _Alloc>::__link_nodes(__node& __p, __node& __f, __node& __l)
 {
-    __p->__prev_->__next_ = __f;
-    __f->__prev_ = __p->__prev_;
-    __p->__prev_ = __l;
-    __l->__next_ = __p;
+    __p.__prev_->__next_ = &__f;
+    __f.__prev_ = __p.__prev_;
+    __p.__prev_ = &__l;
+    __l.__next_ = &__p;
 }

 template <class _Tp, class _Alloc>
@@ -1104,22 +1059,6 @@ list<_Tp, _Alloc>::list(size_type __n)
 #endif
 }

-#if _LIBCPP_STD_VER > 11
-template <class _Tp, class _Alloc>
-list<_Tp, _Alloc>::list(size_type __n, const allocator_type& __a) : base(__a)
-{
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
-    for (; __n > 0; --__n)
-#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
-        emplace_back();
-#else
-        push_back(value_type());
-#endif
-}
-#endif
-
 template <class _Tp, class _Alloc>
 list<_Tp, _Alloc>::list(size_type __n, const value_type& __x)
 {
@@ -1351,7 +1290,7 @@ list<_Tp, _Alloc>::insert(const_iterator __p, const value_type& __x)
    unique_ptr<__node, _Dp> __hold(__node_alloc_traits::allocate(__na, 1), _Dp(__na, 1));
    __hold->__prev_ = 0;
    __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), __x);
-    __link_nodes(__p.__ptr_, __hold.get(), __hold.get());
+    __link_nodes(const_cast<__node&>(*__p.__ptr_), *__hold, *__hold);
    ++base::__sz();
 #if _LIBCPP_DEBUG_LEVEL >= 2
    return iterator(__hold.release(), this);
@@ -1368,9 +1307,9 @@ list<_Tp, _Alloc>::insert(const_iterator __p, size_type __n, const value_type& _
    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
        "list::insert(iterator, n, x) called with an iterator not"
        " referring to this list");
-    iterator __r(__p.__ptr_, this);
+    iterator __r(const_cast<__node_pointer>(__p.__ptr_), this);
 #else
-    iterator __r(__p.__ptr_);
+    iterator __r(const_cast<__node_pointer>(__p.__ptr_));
 #endif
    if (__n > 0)
    {
@@ -1420,7 +1359,7 @@ list<_Tp, _Alloc>::insert(const_iterator __p, size_type __n, const value_type& _
            throw;
        }
 #endif  // _LIBCPP_NO_EXCEPTIONS
-        __link_nodes(__p.__ptr_, __r.__ptr_, __e.__ptr_);
+        __link_nodes(const_cast<__node&>(*__p.__ptr_), *__r.__ptr_, *__e.__ptr_);
        base::__sz() += __ds;
    }
    return __r;
@@ -1436,9 +1375,9 @@ list<_Tp, _Alloc>::insert(const_iterator __p, _InpIter __f, _InpIter __l,
    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
        "list::insert(iterator, range) called with an iterator not"
        " referring to this list");
-    iterator __r(__p.__ptr_, this);
+    iterator __r(const_cast<__node_pointer>(__p.__ptr_), this);
 #else
-    iterator __r(__p.__ptr_);
+    iterator __r(const_cast<__node_pointer>(__p.__ptr_));
 #endif
    if (__f != __l)
    {
@@ -1488,7 +1427,7 @@ list<_Tp, _Alloc>::insert(const_iterator __p, _InpIter __f, _InpIter __l,
            throw;
        }
 #endif  // _LIBCPP_NO_EXCEPTIONS
-        __link_nodes(__p.__ptr_, __r.__ptr_, __e.__ptr_);
+        __link_nodes(const_cast<__node&>(*__p.__ptr_), *__r.__ptr_, *__e.__ptr_);
        base::__sz() += __ds;
    }
    return __r;
@@ -1502,7 +1441,7 @@ list<_Tp, _Alloc>::push_front(const value_type& __x)
    typedef __allocator_destructor<__node_allocator> _Dp;
    unique_ptr<__node, _Dp> __hold(__node_alloc_traits::allocate(__na, 1), _Dp(__na, 1));
    __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), __x);
-    __link_nodes(base::__end_.__next_, __hold.get(), __hold.get());
+    __link_nodes(*base::__end_.__next_, *__hold, *__hold);
    ++base::__sz();
    __hold.release();
 }
@@ -1515,8 +1454,7 @@ list<_Tp, _Alloc>::push_back(const value_type& __x)
    typedef __allocator_destructor<__node_allocator> _Dp;
    unique_ptr<__node, _Dp> __hold(__node_alloc_traits::allocate(__na, 1), _Dp(__na, 1));
    __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), __x);
-    __link_nodes(static_cast<__node_pointer>(pointer_traits<__node_base_pointer>::
-                         pointer_to(base::__end_)), __hold.get(), __hold.get());
+    __link_nodes(static_cast<__node&>(base::__end_), *__hold, *__hold);
    ++base::__sz();
    __hold.release();
 }
@@ -1531,7 +1469,7 @@ list<_Tp, _Alloc>::push_front(value_type&& __x)
    typedef __allocator_destructor<__node_allocator> _Dp;
    unique_ptr<__node, _Dp> __hold(__node_alloc_traits::allocate(__na, 1), _Dp(__na, 1));
    __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), _VSTD::move(__x));
-    __link_nodes(base::__end_.__next_, __hold.get(), __hold.get());
+    __link_nodes(*base::__end_.__next_, *__hold, *__hold);
    ++base::__sz();
    __hold.release();
 }
@@ -1544,8 +1482,7 @@ list<_Tp, _Alloc>::push_back(value_type&& __x)
    typedef __allocator_destructor<__node_allocator> _Dp;
    unique_ptr<__node, _Dp> __hold(__node_alloc_traits::allocate(__na, 1), _Dp(__na, 1));
    __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), _VSTD::move(__x));
-    __link_nodes(static_cast<__node_pointer>(pointer_traits<__node_base_pointer>::
-                         pointer_to(base::__end_)), __hold.get(), __hold.get());
+    __link_nodes(static_cast<__node&>(base::__end_), *__hold, *__hold);
    ++base::__sz();
    __hold.release();
 }
@@ -1561,7 +1498,7 @@ list<_Tp, _Alloc>::emplace_front(_Args&&... __args)
    typedef __allocator_destructor<__node_allocator> _Dp;
    unique_ptr<__node, _Dp> __hold(__node_alloc_traits::allocate(__na, 1), _Dp(__na, 1));
    __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), _VSTD::forward<_Args>(__args)...);
-    __link_nodes(base::__end_.__next_, __hold.get(), __hold.get());
+    __link_nodes(*base::__end_.__next_, *__hold, *__hold);
    ++base::__sz();
    __hold.release();
 }
@@ -1575,8 +1512,7 @@ list<_Tp, _Alloc>::emplace_back(_Args&&... __args)
    typedef __allocator_destructor<__node_allocator> _Dp;
    unique_ptr<__node, _Dp> __hold(__node_alloc_traits::allocate(__na, 1), _Dp(__na, 1));
    __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), _VSTD::forward<_Args>(__args)...);
-    __link_nodes(static_cast<__node_pointer>(pointer_traits<__node_base_pointer>::
-                         pointer_to(base::__end_)), __hold.get(), __hold.get());
+    __link_nodes(static_cast<__node&>(base::__end_), *__hold, *__hold);
    ++base::__sz();
    __hold.release();
 }
@@ -1596,7 +1532,7 @@ list<_Tp, _Alloc>::emplace(const_iterator __p, _Args&&... __args)
    unique_ptr<__node, _Dp> __hold(__node_alloc_traits::allocate(__na, 1), _Dp(__na, 1));
    __hold->__prev_ = 0;
    __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), _VSTD::forward<_Args>(__args)...);
-    __link_nodes(__p.__ptr_, __hold.get(), __hold.get());
+    __link_nodes(const_cast<__node&>(*__p.__ptr_), *__hold, *__hold);
    ++base::__sz();
 #if _LIBCPP_DEBUG_LEVEL >= 2
    return iterator(__hold.release(), this);
@@ -1621,7 +1557,7 @@ list<_Tp, _Alloc>::insert(const_iterator __p, value_type&& __x)
    unique_ptr<__node, _Dp> __hold(__node_alloc_traits::allocate(__na, 1), _Dp(__na, 1));
    __hold->__prev_ = 0;
    __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), _VSTD::move(__x));
-    __link_nodes(__p.__ptr_, __hold.get(), __hold.get());
+    __link_nodes(const_cast<__node&>(*__p.__ptr_), *__hold, *__hold);
    ++base::__sz();
 #if _LIBCPP_DEBUG_LEVEL >= 2
    return iterator(__hold.release(), this);
@@ -1638,7 +1574,7 @@ list<_Tp, _Alloc>::pop_front()
 {
    _LIBCPP_ASSERT(!empty(), "list::pop_front() called with empty list");
    __node_allocator& __na = base::__node_alloc();
-    __node_pointer __n = base::__end_.__next_;
+    __node& __n = *base::__end_.__next_;
    base::__unlink_nodes(__n, __n);
    --base::__sz();
 #if _LIBCPP_DEBUG_LEVEL >= 2
@@ -1647,7 +1583,7 @@ list<_Tp, _Alloc>::pop_front()
    {
        --__p;
        iterator* __i = static_cast<iterator*>((*__p)->__i_);
-        if (__i->__ptr_ == __n)
+        if (__i->__ptr_ == &__n)
        {
            (*__p)->__c_ = nullptr;
            if (--__c->end_ != __p)
@@ -1656,17 +1592,17 @@ list<_Tp, _Alloc>::pop_front()
    }
    __get_db()->unlock();
 #endif
-    __node_alloc_traits::destroy(__na, _VSTD::addressof(__n->__value_));
-    __node_alloc_traits::deallocate(__na, __n, 1);
+    __node_alloc_traits::destroy(__na, _VSTD::addressof(__n.__value_));
+    __node_alloc_traits::deallocate(__na, _VSTD::addressof(__n), 1);
 }

 template <class _Tp, class _Alloc>
 void
 list<_Tp, _Alloc>::pop_back()
 {
-    _LIBCPP_ASSERT(!empty(), "list::pop_back() called with empty list");
+    _LIBCPP_ASSERT(!empty(), "list::pop_front() called with empty list");
    __node_allocator& __na = base::__node_alloc();
-    __node_pointer __n = base::__end_.__prev_;
+    __node& __n = *base::__end_.__prev_;
    base::__unlink_nodes(__n, __n);
    --base::__sz();
 #if _LIBCPP_DEBUG_LEVEL >= 2
@@ -1675,7 +1611,7 @@ list<_Tp, _Alloc>::pop_back()
    {
        --__p;
        iterator* __i = static_cast<iterator*>((*__p)->__i_);
-        if (__i->__ptr_ == __n)
+        if (__i->__ptr_ == &__n)
        {
            (*__p)->__c_ = nullptr;
            if (--__c->end_ != __p)
@@ -1684,8 +1620,8 @@ list<_Tp, _Alloc>::pop_back()
    }
    __get_db()->unlock();
 #endif
-    __node_alloc_traits::destroy(__na, _VSTD::addressof(__n->__value_));
-    __node_alloc_traits::deallocate(__na, __n, 1);
+    __node_alloc_traits::destroy(__na, _VSTD::addressof(__n.__value_));
+    __node_alloc_traits::deallocate(__na, _VSTD::addressof(__n), 1);
 }

 template <class _Tp, class _Alloc>
@@ -1700,8 +1636,8 @@ list<_Tp, _Alloc>::erase(const_iterator __p)
    _LIBCPP_ASSERT(__p != end(),
        "list::erase(iterator) called with a non-dereferenceable iterator");
    __node_allocator& __na = base::__node_alloc();
-    __node_pointer __n = __p.__ptr_;
-    __node_pointer __r = __n->__next_;
+    __node& __n = const_cast<__node&>(*__p.__ptr_);
+    __node_pointer __r = __n.__next_;
    base::__unlink_nodes(__n, __n);
    --base::__sz();
 #if _LIBCPP_DEBUG_LEVEL >= 2
@@ -1710,7 +1646,7 @@ list<_Tp, _Alloc>::erase(const_iterator __p)
    {
        --__p;
        iterator* __i = static_cast<iterator*>((*__p)->__i_);
-        if (__i->__ptr_ == __n)
+        if (__i->__ptr_ == &__n)
        {
            (*__p)->__c_ = nullptr;
            if (--__c->end_ != __p)
@@ -1719,8 +1655,8 @@ list<_Tp, _Alloc>::erase(const_iterator __p)
    }
    __get_db()->unlock();
 #endif
-    __node_alloc_traits::destroy(__na, _VSTD::addressof(__n->__value_));
-    __node_alloc_traits::deallocate(__na, __n, 1);
+    __node_alloc_traits::destroy(__na, _VSTD::addressof(__n.__value_));
+    __node_alloc_traits::deallocate(__na, _VSTD::addressof(__n), 1);
 #if _LIBCPP_DEBUG_LEVEL >= 2
    return iterator(__r, this);
 #else
@@ -1740,10 +1676,10 @@ list<_Tp, _Alloc>::erase(const_iterator __f, const_iterator __l)
    if (__f != __l)
    {
        __node_allocator& __na = base::__node_alloc();
-        base::__unlink_nodes(__f.__ptr_, __l.__ptr_->__prev_);
+        base::__unlink_nodes(const_cast<__node&>(*__f.__ptr_), *__l.__ptr_->__prev_);
        while (__f != __l)
        {
-            __node_pointer __n = __f.__ptr_;
+            __node& __n = const_cast<__node&>(*__f.__ptr_);
            ++__f;
            --base::__sz();
 #if _LIBCPP_DEBUG_LEVEL >= 2
@@ -1752,7 +1688,7 @@ list<_Tp, _Alloc>::erase(const_iterator __f, const_iterator __l)
            {
                --__p;
                iterator* __i = static_cast<iterator*>((*__p)->__i_);
-                if (__i->__ptr_ == __n)
+                if (__i->__ptr_ == &__n)
                {
                    (*__p)->__c_ = nullptr;
                    if (--__c->end_ != __p)
@@ -1761,14 +1697,14 @@ list<_Tp, _Alloc>::erase(const_iterator __f, const_iterator __l)
            }
            __get_db()->unlock();
 #endif
-            __node_alloc_traits::destroy(__na, _VSTD::addressof(__n->__value_));
-            __node_alloc_traits::deallocate(__na, __n, 1);
+            __node_alloc_traits::destroy(__na, _VSTD::addressof(__n.__value_));
+            __node_alloc_traits::deallocate(__na, _VSTD::addressof(__n), 1);
        }
    }
 #if _LIBCPP_DEBUG_LEVEL >= 2
-    return iterator(__l.__ptr_, this);
+    return iterator(const_cast<__node_pointer>(__l.__ptr_), this);
 #else
-    return iterator(__l.__ptr_);
+    return iterator(const_cast<__node_pointer>(__l.__ptr_));
 #endif
 }

@@ -1826,8 +1762,7 @@ list<_Tp, _Alloc>::resize(size_type __n)
            throw;
        }
 #endif  // _LIBCPP_NO_EXCEPTIONS
-        __link_nodes(static_cast<__node_pointer>(pointer_traits<__node_base_pointer>::
-                         pointer_to(base::__end_)), __r.__ptr_, __e.__ptr_);
+        __link_nodes(static_cast<__node&>(base::__end_), *__r.__ptr_, *__e.__ptr_);
        base::__sz() += __ds;
    }
 }
@@ -1886,8 +1821,7 @@ list<_Tp, _Alloc>::resize(size_type __n, const value_type& __x)
            throw;
        }
 #endif  // _LIBCPP_NO_EXCEPTIONS
-        __link_nodes(static_cast<__node_pointer>(pointer_traits<__node_base_pointer>::
-                         pointer_to(base::__end_)), __r.__ptr_, __e.__ptr_);
+        __link_nodes(static_cast<__node&>(base::__end_), *__r.__ptr_, *__e.__ptr_);
        base::__sz() += __ds;
    }
 }
@@ -1905,10 +1839,10 @@ list<_Tp, _Alloc>::splice(const_iterator __p, list& __c)
 #endif
    if (!__c.empty())
    {
-        __node_pointer __f = __c.__end_.__next_;
-        __node_pointer __l = __c.__end_.__prev_;
+        __node& __f = *__c.__end_.__next_;
+        __node& __l = *__c.__end_.__prev_;
        base::__unlink_nodes(__f, __l);
-        __link_nodes(__p.__ptr_, __f, __l);
+        __link_nodes(const_cast<__node&>(*__p.__ptr_), __f, __l);
        base::__sz() += __c.__sz();
        __c.__sz() = 0;
 #if _LIBCPP_DEBUG_LEVEL >= 2
@@ -1919,8 +1853,7 @@ list<_Tp, _Alloc>::splice(const_iterator __p, list& __c)
        {
            --__p;
            iterator* __i = static_cast<iterator*>((*__p)->__i_);
-            if (__i->__ptr_ != static_cast<__node_pointer>(
-                       pointer_traits<__node_base_pointer>::pointer_to(__c.__end_)))
+            if (__i->__ptr_ != static_cast<__node_pointer>(&__c.__end_))
            {
                __cn1->__add(*__p);
                (*__p)->__c_ = __cn1;
@@ -1950,9 +1883,9 @@ list<_Tp, _Alloc>::splice(const_iterator __p, list& __c, const_iterator __i)
 #endif
    if (__p.__ptr_ != __i.__ptr_ && __p.__ptr_ != __i.__ptr_->__next_)
    {
-        __node_pointer __f = __i.__ptr_;
+        __node& __f = const_cast<__node&>(*__i.__ptr_);
        base::__unlink_nodes(__f, __f);
-        __link_nodes(__p.__ptr_, __f, __f);
+        __link_nodes(const_cast<__node&>(*__p.__ptr_), __f, __f);
        --__c.__sz();
        ++base::__sz();
 #if _LIBCPP_DEBUG_LEVEL >= 2
@@ -1963,7 +1896,7 @@ list<_Tp, _Alloc>::splice(const_iterator __p, list& __c, const_iterator __i)
        {
            --__p;
            iterator* __j = static_cast<iterator*>((*__p)->__i_);
-            if (__j->__ptr_ == __f)
+            if (__j->__ptr_ == &__f)
            {
                __cn1->__add(*__p);
                (*__p)->__c_ = __cn1;
@@ -2004,11 +1937,11 @@ list<_Tp, _Alloc>::splice(const_iterator __p, list& __c, const_iterator __f, con
            __c.__sz() -= __s;
            base::__sz() += __s;
        }
-        __node_pointer __first = __f.__ptr_;
+        __node& __first = const_cast<__node&>(*__f.__ptr_);
        --__l;
-        __node_pointer __last = __l.__ptr_;
+        __node& __last = const_cast<__node&>(*__l.__ptr_);
        base::__unlink_nodes(__first, __last);
-        __link_nodes(__p.__ptr_, __first, __last);
+        __link_nodes(const_cast<__node&>(*__p.__ptr_), __first, __last);
 #if _LIBCPP_DEBUG_LEVEL >= 2
        __libcpp_db* __db = __get_db();
        __c_node* __cn1 = __db->__find_c_and_lock(this);
@@ -2017,7 +1950,7 @@ list<_Tp, _Alloc>::splice(const_iterator __p, list& __c, const_iterator __f, con
        {
            --__p;
            iterator* __j = static_cast<iterator*>((*__p)->__i_);
-            for (__node_pointer __k = __f.__ptr_;
+            for (__node_pointer __k = const_cast<__node_pointer>(__f.__ptr_);
                                          __k != __l.__ptr_; __k = __k->__next_)
            {
                if (__j->__ptr_ == __k)
@@ -2123,12 +2056,12 @@ list<_Tp, _Alloc>::merge(list& __c, _Comp __comp)
                    ;
                base::__sz() += __ds;
                __c.__sz() -= __ds;
-                __node_pointer __f = __f2.__ptr_;
-                __node_pointer __l = __m2.__ptr_->__prev_;
+                __node& __f = *__f2.__ptr_;
+                __node& __l = *__m2.__ptr_->__prev_;
                __f2 = __m2;
                base::__unlink_nodes(__f, __l);
                __m2 = _VSTD::next(__f1);
-                __link_nodes(__f1.__ptr_, __f, __l);
+                __link_nodes(*__f1.__ptr_, __f, __l);
                __f1 = __m2;
            }
            else
@@ -2143,8 +2076,7 @@ list<_Tp, _Alloc>::merge(list& __c, _Comp __comp)
        {
            --__p;
            iterator* __i = static_cast<iterator*>((*__p)->__i_);
-            if (__i->__ptr_ != static_cast<__node_pointer>(
-                       pointer_traits<__node_base_pointer>::pointer_to(__c.__end_)))
+            if (__i->__ptr_ != static_cast<__node_pointer>(&__c.__end_))
            {
                __cn1->__add(*__p);
                (*__p)->__c_ = __cn1;
@@ -2187,9 +2119,9 @@ list<_Tp, _Alloc>::__sort(iterator __f1, iterator __e2, size_type __n, _Comp& __
    case 2:
        if (__comp(*--__e2, *__f1))
        {
-            __node_pointer __f = __e2.__ptr_;
+            __node& __f = *__e2.__ptr_;
            base::__unlink_nodes(__f, __f);
-            __link_nodes(__f1.__ptr_, __f, __f);
+            __link_nodes(*__f1.__ptr_, __f, __f);
            return __e2;
        }
        return __f1;
@@ -2203,13 +2135,13 @@ list<_Tp, _Alloc>::__sort(iterator __f1, iterator __e2, size_type __n, _Comp& __
        iterator __m2 = _VSTD::next(__f2);
        for (; __m2 != __e2 && __comp(*__m2, *__f1); ++__m2)
            ;
-        __node_pointer __f = __f2.__ptr_;
-        __node_pointer __l = __m2.__ptr_->__prev_;
+        __node& __f = *__f2.__ptr_;
+        __node& __l = *__m2.__ptr_->__prev_;
        __r = __f2;
        __e1 = __f2 = __m2;
        base::__unlink_nodes(__f, __l);
        __m2 = _VSTD::next(__f1);
-        __link_nodes(__f1.__ptr_, __f, __l);
+        __link_nodes(*__f1.__ptr_, __f, __l);
        __f1 = __m2;
    }
    else
@@ -2221,14 +2153,14 @@ list<_Tp, _Alloc>::__sort(iterator __f1, iterator __e2, size_type __n, _Comp& __
            iterator __m2 = _VSTD::next(__f2);
            for (; __m2 != __e2 && __comp(*__m2, *__f1); ++__m2)
                ;
-            __node_pointer __f = __f2.__ptr_;
-            __node_pointer __l = __m2.__ptr_->__prev_;
+            __node& __f = *__f2.__ptr_;
+            __node& __l = *__m2.__ptr_->__prev_;
            if (__e1 == __f2)
                __e1 = __m2;
            __f2 = __m2;
            base::__unlink_nodes(__f, __l);
            __m2 = _VSTD::next(__f1);
-            __link_nodes(__f1.__ptr_, __f, __l);
+            __link_nodes(*__f1.__ptr_, __f, __l);
            __f1 = __m2;
        }
        else
@@ -2266,8 +2198,7 @@ template <class _Tp, class _Alloc>
 bool
 list<_Tp, _Alloc>::__dereferenceable(const const_iterator* __i) const
 {
-    return __i->__ptr_ != static_cast<__node_pointer>(
-                       pointer_traits<__node_base_pointer>::pointer_to(const_cast<__node_base&>(this->__end_)));
+    return __i->__ptr_ != &this->__end_;
 }

 template <class _Tp, class _Alloc>
--- a/include/locale
+++ b/include/locale
--- a/include/map
+++ b/include/map
--- a/include/memory
+++ b/include/memory
@@ -90,7 +90,7 @@ struct allocator_traits
    template <class T>
        static void destroy(allocator_type& a, T* p);

-    static size_type max_size(const allocator_type& a); // noexcept in C++14
+    static size_type max_size(const allocator_type& a);

    static allocator_type
        select_on_container_copy_construction(const allocator_type& a);
@@ -350,10 +350,6 @@ class bad_weak_ptr
    bad_weak_ptr() noexcept;
 };

-template<class T, class... Args> unique_ptr<T> make_unique(Args&&... args);     // C++14
-template<class T>                unique_ptr<T> make_unique(size_t n);           // C++14
-template<class T, class... Args> unspecified   make_unique(Args&&...) = delete; // C++14, T == U[N]
-
 template<class T>
 class shared_ptr
 {
@@ -496,8 +492,8 @@ public:
    long use_count() const noexcept;
    bool expired() const noexcept;
    shared_ptr<T> lock() const noexcept;
-    template<class U> bool owner_before(shared_ptr<U> const& b) const;
-    template<class U> bool owner_before(weak_ptr<U> const& b) const;
+    template<class U> bool owner_before(shared_ptr<U> const& b);
+    template<class U> bool owner_before(weak_ptr<U> const& b);
 };

 // weak_ptr specialized algorithms:
@@ -618,12 +614,60 @@ void* align(size_t alignment, size_t size, void*& ptr, size_t& space);

 _LIBCPP_BEGIN_NAMESPACE_STD

-// addressof moved to <__functional_base>
+// addressof
+
+template <class _Tp>
+inline _LIBCPP_INLINE_VISIBILITY
+_Tp*
+addressof(_Tp& __x) _NOEXCEPT
+{
+    return (_Tp*)&reinterpret_cast<const volatile char&>(__x);
+}
+
+#if defined(_LIBCPP_HAS_OBJC_ARC) && !defined(_LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF)
+// Objective-C++ Automatic Reference Counting uses qualified pointers
+// that require special addressof() signatures. When
+// _LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF is defined, the compiler
+// itself is providing these definitions. Otherwise, we provide them.
+template <class _Tp>
+inline _LIBCPP_INLINE_VISIBILITY
+__strong _Tp*
+addressof(__strong _Tp& __x) _NOEXCEPT
+{
+  return &__x;
+}
+
+#ifdef _LIBCPP_HAS_OBJC_ARC_WEAK
+template <class _Tp>
+inline _LIBCPP_INLINE_VISIBILITY
+__weak _Tp*
+addressof(__weak _Tp& __x) _NOEXCEPT
+{
+  return &__x;
+}
+#endif
+
+template <class _Tp>
+inline _LIBCPP_INLINE_VISIBILITY
+__autoreleasing _Tp*
+addressof(__autoreleasing _Tp& __x) _NOEXCEPT
+{
+  return &__x;
+}
+
+template <class _Tp>
+inline _LIBCPP_INLINE_VISIBILITY
+__unsafe_unretained _Tp*
+addressof(__unsafe_unretained _Tp& __x) _NOEXCEPT
+{
+  return &__x;
+}
+#endif

 template <class _Tp> class allocator;

 template <>
-class _LIBCPP_TYPE_VIS_ONLY allocator<void>
+class _LIBCPP_TYPE_VIS allocator<void>
 {
 public:
    typedef void*             pointer;
@@ -634,7 +678,7 @@ public:
 };

 template <>
-class _LIBCPP_TYPE_VIS_ONLY allocator<const void>
+class _LIBCPP_TYPE_VIS allocator<const void>
 {
 public:
    typedef const void*       pointer;
@@ -869,7 +913,7 @@ struct __pointer_traits_rebind<_Sp<_Tp, _A0, _A1, _A2>, _Up, false>
 #endif  // _LIBCPP_HAS_NO_VARIADICS

 template <class _Ptr>
-struct _LIBCPP_TYPE_VIS_ONLY pointer_traits
+struct _LIBCPP_TYPE_VIS pointer_traits
 {
    typedef _Ptr                                                     pointer;
    typedef typename __pointer_traits_element_type<pointer>::type    element_type;
@@ -892,7 +936,7 @@ public:
 };

 template <class _Tp>
-struct _LIBCPP_TYPE_VIS_ONLY pointer_traits<_Tp*>
+struct _LIBCPP_TYPE_VIS pointer_traits<_Tp*>
 {
    typedef _Tp*      pointer;
    typedef _Tp       element_type;
@@ -917,13 +961,13 @@ public:

 namespace __has_pointer_type_imp
 {
-    template <class _Up> static __two __test(...);
-    template <class _Up> static char __test(typename _Up::pointer* = 0);
+    template <class _Up> static __two test(...);
+    template <class _Up> static char test(typename _Up::pointer* = 0);
 }

 template <class _Tp>
 struct __has_pointer_type
-    : public integral_constant<bool, sizeof(__has_pointer_type_imp::__test<_Tp>(0)) == 1>
+    : public integral_constant<bool, sizeof(__has_pointer_type_imp::test<_Tp>(0)) == 1>
 {
 };

@@ -1399,7 +1443,7 @@ struct __alloc_traits_difference_type<_Alloc, _Ptr, true>
 };

 template <class _Alloc>
-struct _LIBCPP_TYPE_VIS_ONLY allocator_traits
+struct _LIBCPP_TYPE_VIS allocator_traits
 {
    typedef _Alloc                              allocator_type;
    typedef typename allocator_type::value_type value_type;
@@ -1483,7 +1527,7 @@ struct _LIBCPP_TYPE_VIS_ONLY allocator_traits
            {__destroy(__has_destroy<allocator_type, _Tp*>(), __a, __p);}

    _LIBCPP_INLINE_VISIBILITY
-    static size_type max_size(const allocator_type& __a) _NOEXCEPT
+    static size_type max_size(const allocator_type& __a)
        {return __max_size(__has_max_size<const allocator_type>(), __a);}

    _LIBCPP_INLINE_VISIBILITY
@@ -1605,7 +1649,7 @@ private:
 // allocator

 template <class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY allocator
+class _LIBCPP_TYPE_VIS allocator
 {
 public:
    typedef size_t            size_type;
@@ -1697,7 +1741,7 @@ public:
 };

 template <class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY allocator<const _Tp>
+class _LIBCPP_TYPE_VIS allocator<const _Tp>
 {
 public:
    typedef size_t            size_type;
@@ -1706,7 +1750,7 @@ public:
    typedef const _Tp*        const_pointer;
    typedef const _Tp&        reference;
    typedef const _Tp&        const_reference;
-    typedef const _Tp         value_type;
+    typedef _Tp               value_type;

    typedef true_type propagate_on_container_move_assignment;

@@ -1795,7 +1839,7 @@ inline _LIBCPP_INLINE_VISIBILITY
 bool operator!=(const allocator<_Tp>&, const allocator<_Up>&) _NOEXCEPT {return false;}

 template <class _OutputIterator, class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY raw_storage_iterator
+class _LIBCPP_TYPE_VIS raw_storage_iterator
    : public iterator<output_iterator_tag,
                      _Tp,                                         // purposefully not C++03
                      ptrdiff_t,                                   // purposefully not C++03
@@ -1848,7 +1892,7 @@ struct auto_ptr_ref
 };

 template<class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY auto_ptr
+class _LIBCPP_TYPE_VIS auto_ptr
 {
 private:
    _Tp* __ptr_;
@@ -1892,7 +1936,7 @@ public:
 };

 template <>
-class _LIBCPP_TYPE_VIS_ONLY auto_ptr<void>
+class _LIBCPP_TYPE_VIS auto_ptr<void>
 {
 public:
    typedef void element_type;
@@ -1954,7 +1998,7 @@ public:
    _LIBCPP_INLINE_VISIBILITY __libcpp_compressed_pair_imp(_T1_param __t1, _T2_param __t2)
        : __first_(_VSTD::forward<_T1_param>(__t1)), __second_(_VSTD::forward<_T2_param>(__t2)) {}

-#if defined(_LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS) && !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
+#ifdef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS

    _LIBCPP_INLINE_VISIBILITY
    __libcpp_compressed_pair_imp(const __libcpp_compressed_pair_imp& __p)
@@ -1973,6 +2017,8 @@ public:
            return *this;
        }

+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
    _LIBCPP_INLINE_VISIBILITY
    __libcpp_compressed_pair_imp(__libcpp_compressed_pair_imp&& __p)
        _NOEXCEPT_(is_nothrow_move_constructible<_T1>::value &&
@@ -1990,7 +2036,9 @@ public:
            return *this;
        }

-#endif  // defined(_LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS) && !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+#endif  // _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS

 #ifndef _LIBCPP_HAS_NO_VARIADICS

@@ -2047,7 +2095,7 @@ public:
    _LIBCPP_INLINE_VISIBILITY __libcpp_compressed_pair_imp(_T1_param __t1, _T2_param __t2)
        : _T1(_VSTD::forward<_T1_param>(__t1)), __second_(_VSTD::forward<_T2_param>(__t2)) {}

-#if defined(_LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS) && !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
+#ifdef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS

    _LIBCPP_INLINE_VISIBILITY
    __libcpp_compressed_pair_imp(const __libcpp_compressed_pair_imp& __p)
@@ -2065,6 +2113,8 @@ public:
            return *this;
        }

+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
    _LIBCPP_INLINE_VISIBILITY
    __libcpp_compressed_pair_imp(__libcpp_compressed_pair_imp&& __p)
        _NOEXCEPT_(is_nothrow_move_constructible<_T1>::value &&
@@ -2081,7 +2131,9 @@ public:
            return *this;
        }

-#endif  // defined(_LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS) && !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+#endif  // _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS

 #ifndef _LIBCPP_HAS_NO_VARIADICS

@@ -2139,7 +2191,7 @@ public:
                   is_nothrow_move_constructible<_T2>::value)
        : _T2(_VSTD::forward<_T2_param>(__t2)), __first_(_VSTD::forward<_T1_param>(__t1)) {}

-#if defined(_LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS) && !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
+#ifdef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS

    _LIBCPP_INLINE_VISIBILITY
    __libcpp_compressed_pair_imp(const __libcpp_compressed_pair_imp& __p)
@@ -2157,6 +2209,8 @@ public:
            return *this;
        }

+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
    _LIBCPP_INLINE_VISIBILITY
    __libcpp_compressed_pair_imp(__libcpp_compressed_pair_imp&& __p)
        _NOEXCEPT_(is_nothrow_move_constructible<_T1>::value &&
@@ -2173,7 +2227,9 @@ public:
            return *this;
        }

-#endif  // defined(_LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS) && !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+#endif  // _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS

 #ifndef _LIBCPP_HAS_NO_VARIADICS

@@ -2229,7 +2285,7 @@ public:
    _LIBCPP_INLINE_VISIBILITY __libcpp_compressed_pair_imp(_T1_param __t1, _T2_param __t2)
        : _T1(_VSTD::forward<_T1_param>(__t1)), _T2(_VSTD::forward<_T2_param>(__t2)) {}

-#if defined(_LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS) && !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
+#ifdef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS

    _LIBCPP_INLINE_VISIBILITY
    __libcpp_compressed_pair_imp(const __libcpp_compressed_pair_imp& __p)
@@ -2247,6 +2303,8 @@ public:
            return *this;
        }

+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
    _LIBCPP_INLINE_VISIBILITY
    __libcpp_compressed_pair_imp(__libcpp_compressed_pair_imp&& __p)
        _NOEXCEPT_(is_nothrow_move_constructible<_T1>::value &&
@@ -2263,7 +2321,9 @@ public:
            return *this;
        }

-#endif  // defined(_LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS) && !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+#endif  // _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS

 #ifndef _LIBCPP_HAS_NO_VARIADICS

@@ -2316,7 +2376,7 @@ public:
    _LIBCPP_INLINE_VISIBILITY __compressed_pair(_T1_param __t1, _T2_param __t2)
        : base(_VSTD::forward<_T1_param>(__t1), _VSTD::forward<_T2_param>(__t2)) {}

-#if defined(_LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS) && !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
+#ifdef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS

    _LIBCPP_INLINE_VISIBILITY
    __compressed_pair(const __compressed_pair& __p)
@@ -2333,6 +2393,7 @@ public:
            return *this;
        }

+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
    _LIBCPP_INLINE_VISIBILITY
    __compressed_pair(__compressed_pair&& __p)
        _NOEXCEPT_(is_nothrow_move_constructible<_T1>::value &&
@@ -2348,7 +2409,9 @@ public:
            return *this;
        }

-#endif  // defined(_LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS) && !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+#endif  // _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS

 #ifndef _LIBCPP_HAS_NO_VARIADICS

@@ -2409,7 +2472,7 @@ struct __same_or_less_cv_qualified<_Ptr1, _Ptr2, true>
 // default_delete

 template <class _Tp>
-struct _LIBCPP_TYPE_VIS_ONLY default_delete
+struct _LIBCPP_TYPE_VIS default_delete
 {
 #ifndef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR default_delete() _NOEXCEPT = default;
@@ -2428,7 +2491,7 @@ struct _LIBCPP_TYPE_VIS_ONLY default_delete
 };

 template <class _Tp>
-struct _LIBCPP_TYPE_VIS_ONLY default_delete<_Tp[]>
+struct _LIBCPP_TYPE_VIS default_delete<_Tp[]>
 {
 public:
 #ifndef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
@@ -2451,7 +2514,7 @@ public:
 };

 template <class _Tp, class _Dp = default_delete<_Tp> >
-class _LIBCPP_TYPE_VIS_ONLY unique_ptr
+class _LIBCPP_TYPE_VIS unique_ptr
 {
 public:
    typedef _Tp element_type;
@@ -2630,7 +2693,7 @@ public:
 };

 template <class _Tp, class _Dp>
-class _LIBCPP_TYPE_VIS_ONLY unique_ptr<_Tp[], _Dp>
+class _LIBCPP_TYPE_VIS unique_ptr<_Tp[], _Dp>
 {
 public:
    typedef _Tp element_type;
@@ -3016,61 +3079,8 @@ move(unique_ptr<_Tp, _Dp>& __t)

 #endif

-#if _LIBCPP_STD_VER > 11
-
-template<class _Tp>
-struct __unique_if
-{
-    typedef unique_ptr<_Tp> __unique_single;
-};
-
-template<class _Tp>
-struct __unique_if<_Tp[]>
-{
-    typedef unique_ptr<_Tp[]> __unique_array_unknown_bound;
-};
-
-template<class _Tp, size_t _Np>
-struct __unique_if<_Tp[_Np]>
-{
-    typedef void __unique_array_known_bound;
-};
-
-template<class _Tp, class... _Args>
-inline _LIBCPP_INLINE_VISIBILITY
-typename __unique_if<_Tp>::__unique_single
-make_unique(_Args&&... __args)
-{
-    return unique_ptr<_Tp>(new _Tp(_VSTD::forward<_Args>(__args)...));
-}
-
-template<class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY
-typename __unique_if<_Tp>::__unique_array_unknown_bound
-make_unique(size_t __n)
-{
-    typedef typename remove_extent<_Tp>::type _Up;
-    return unique_ptr<_Tp>(new _Up[__n]());
-}
-
-template<class _Tp, class... _Args>
-    typename __unique_if<_Tp>::__unique_array_known_bound
-    make_unique(_Args&&...) = delete;
-
-#endif  // _LIBCPP_STD_VER > 11
-
 template <class _Tp> struct hash;

-template <class _Size>
-inline _LIBCPP_INLINE_VISIBILITY
-_Size
-__loadword(const void* __p)
-{
-    _Size __r;
-    std::memcpy(&__r, __p, sizeof(__r));
-    return __r;
-}
-
 // We use murmur2 when size_t is 32 bits, and cityhash64 when size_t
 // is 64 bits.  This is because cityhash64 uses 64bit x 64bit
 // multiplication, which can be very slow on 32-bit systems.
@@ -3094,7 +3104,7 @@ __murmur2_or_cityhash<_Size, 32>::operator()(const void* __key, _Size __len)
    const unsigned char* __data = static_cast<const unsigned char*>(__key);
    for (; __len >= 4; __data += 4, __len -= 4)
    {
-        _Size __k = __loadword<_Size>(__data);
+        _Size __k = *(const _Size*)__data;
        __k *= __m;
        __k ^= __k >> __r;
        __k *= __m;
@@ -3153,13 +3163,13 @@ struct __murmur2_or_cityhash<_Size, 64>

  static _Size __hash_len_0_to_16(const char* __s, _Size __len) {
    if (__len > 8) {
-      const _Size __a = __loadword<_Size>(__s);
-      const _Size __b = __loadword<_Size>(__s + __len - 8);
+      const _Size __a = *(const _Size*)__s;
+      const _Size __b = *(const _Size*)(__s + __len - 8);
      return __hash_len_16(__a, __rotate_by_at_least_1(__b + __len, __len)) ^ __b;
    }
    if (__len >= 4) {
-      const uint32_t __a = __loadword<uint32_t>(__s);
-      const uint32_t __b = __loadword<uint32_t>(__s + __len - 4);
+      const uint32_t __a = *(const uint32_t*)(__s);
+      const uint32_t __b = *(const uint32_t*)(__s + __len - 4);
      return __hash_len_16(__len + (__a << 3), __b);
    }
    if (__len > 0) {
@@ -3175,10 +3185,10 @@ struct __murmur2_or_cityhash<_Size, 64>
  }

  static _Size __hash_len_17_to_32(const char *__s, _Size __len) {
-    const _Size __a = __loadword<_Size>(__s) * __k1;
-    const _Size __b = __loadword<_Size>(__s + 8);
-    const _Size __c = __loadword<_Size>(__s + __len - 8) * __k2;
-    const _Size __d = __loadword<_Size>(__s + __len - 16) * __k0;
+    const _Size __a = *(const _Size*)(__s) * __k1;
+    const _Size __b = *(const _Size*)(__s + 8);
+    const _Size __c = *(const _Size*)(__s + __len - 8) * __k2;
+    const _Size __d = *(const _Size*)(__s + __len - 16) * __k0;
    return __hash_len_16(__rotate(__a - __b, 43) + __rotate(__c, 30) + __d,
                         __a + __rotate(__b ^ __k3, 20) - __c + __len);
  }
@@ -3199,33 +3209,33 @@ struct __murmur2_or_cityhash<_Size, 64>
  // Return a 16-byte hash for s[0] ... s[31], a, and b.  Quick and dirty.
  static pair<_Size, _Size> __weak_hash_len_32_with_seeds(
      const char* __s, _Size __a, _Size __b) {
-    return __weak_hash_len_32_with_seeds(__loadword<_Size>(__s),
-                                         __loadword<_Size>(__s + 8),
-                                         __loadword<_Size>(__s + 16),
-                                         __loadword<_Size>(__s + 24),
+    return __weak_hash_len_32_with_seeds(*(const _Size*)(__s),
+                                         *(const _Size*)(__s + 8),
+                                         *(const _Size*)(__s + 16),
+                                         *(const _Size*)(__s + 24),
                                         __a,
                                         __b);
  }

  // Return an 8-byte hash for 33 to 64 bytes.
  static _Size __hash_len_33_to_64(const char *__s, size_t __len) {
-    _Size __z = __loadword<_Size>(__s + 24);
-    _Size __a = __loadword<_Size>(__s) +
-                (__len + __loadword<_Size>(__s + __len - 16)) * __k0;
+    _Size __z = *(const _Size*)(__s + 24);
+    _Size __a = *(const _Size*)(__s) +
+                (__len + *(const _Size*)(__s + __len - 16)) * __k0;
    _Size __b = __rotate(__a + __z, 52);
    _Size __c = __rotate(__a, 37);
-    __a += __loadword<_Size>(__s + 8);
+    __a += *(const _Size*)(__s + 8);
    __c += __rotate(__a, 7);
-    __a += __loadword<_Size>(__s + 16);
+    __a += *(const _Size*)(__s + 16);
    _Size __vf = __a + __z;
    _Size __vs = __b + __rotate(__a, 31) + __c;
-    __a = __loadword<_Size>(__s + 16) + __loadword<_Size>(__s + __len - 32);
-    __z += __loadword<_Size>(__s + __len - 8);
+    __a = *(const _Size*)(__s + 16) + *(const _Size*)(__s + __len - 32);
+    __z += *(const _Size*)(__s + __len - 8);
    __b = __rotate(__a + __z, 52);
    __c = __rotate(__a, 37);
-    __a += __loadword<_Size>(__s + __len - 24);
+    __a += *(const _Size*)(__s + __len - 24);
    __c += __rotate(__a, 7);
-    __a += __loadword<_Size>(__s + __len - 16);
+    __a += *(const _Size*)(__s + __len - 16);
    _Size __wf = __a + __z;
    _Size __ws = __b + __rotate(__a, 31) + __c;
    _Size __r = __shift_mix((__vf + __ws) * __k2 + (__wf + __vs) * __k0);
@@ -3251,26 +3261,26 @@ __murmur2_or_cityhash<_Size, 64>::operator()(const void* __key, _Size __len)

  // For strings over 64 bytes we hash the end first, and then as we
  // loop we keep 56 bytes of state: v, w, x, y, and z.
-  _Size __x = __loadword<_Size>(__s + __len - 40);
-  _Size __y = __loadword<_Size>(__s + __len - 16) +
-              __loadword<_Size>(__s + __len - 56);
-  _Size __z = __hash_len_16(__loadword<_Size>(__s + __len - 48) + __len,
-                          __loadword<_Size>(__s + __len - 24));
+  _Size __x = *(const _Size*)(__s + __len - 40);
+  _Size __y = *(const _Size*)(__s + __len - 16) +
+              *(const _Size*)(__s + __len - 56);
+  _Size __z = __hash_len_16(*(const _Size*)(__s + __len - 48) + __len,
+                          *(const _Size*)(__s + __len - 24));
  pair<_Size, _Size> __v = __weak_hash_len_32_with_seeds(__s + __len - 64, __len, __z);
  pair<_Size, _Size> __w = __weak_hash_len_32_with_seeds(__s + __len - 32, __y + __k1, __x);
-  __x = __x * __k1 + __loadword<_Size>(__s);
+  __x = __x * __k1 + *(const _Size*)(__s);

  // Decrease len to the nearest multiple of 64, and operate on 64-byte chunks.
  __len = (__len - 1) & ~static_cast<_Size>(63);
  do {
-    __x = __rotate(__x + __y + __v.first + __loadword<_Size>(__s + 8), 37) * __k1;
-    __y = __rotate(__y + __v.second + __loadword<_Size>(__s + 48), 42) * __k1;
+    __x = __rotate(__x + __y + __v.first + *(const _Size*)(__s + 8), 37) * __k1;
+    __y = __rotate(__y + __v.second + *(const _Size*)(__s + 48), 42) * __k1;
    __x ^= __w.second;
-    __y += __v.first + __loadword<_Size>(__s + 40);
+    __y += __v.first + *(const _Size*)(__s + 40);
    __z = __rotate(__z + __w.first, 33) * __k1;
    __v = __weak_hash_len_32_with_seeds(__s, __v.second * __k1, __x + __w.first);
    __w = __weak_hash_len_32_with_seeds(__s + 32, __z + __w.second,
-                                        __y + __loadword<_Size>(__s + 16));
+                                        __y + *(const _Size*)(__s + 16));
    std::swap(__z, __x);
    __s += 64;
    __len -= 64;
@@ -3385,7 +3395,7 @@ struct __scalar_hash<_Tp, 4>
 };

 template<class _Tp>
-struct _LIBCPP_TYPE_VIS_ONLY hash<_Tp*>
+struct _LIBCPP_TYPE_VIS hash<_Tp*>
    : public unary_function<_Tp*, size_t>
 {
    _LIBCPP_INLINE_VISIBILITY
@@ -3402,7 +3412,7 @@ struct _LIBCPP_TYPE_VIS_ONLY hash<_Tp*>
 };

 template <class _Tp, class _Dp>
-struct _LIBCPP_TYPE_VIS_ONLY hash<unique_ptr<_Tp, _Dp> >
+struct _LIBCPP_TYPE_VIS hash<unique_ptr<_Tp, _Dp> >
 {
    typedef unique_ptr<_Tp, _Dp> argument_type;
    typedef size_t               result_type;
@@ -3575,9 +3585,9 @@ public:
    virtual const char* what() const  _NOEXCEPT;
 };

-template<class _Tp> class _LIBCPP_TYPE_VIS_ONLY weak_ptr;
+template<class _Tp> class _LIBCPP_TYPE_VIS weak_ptr;

-class _LIBCPP_TYPE_VIS __shared_count
+class __shared_count
 {
    __shared_count(const __shared_count&);
    __shared_count& operator=(const __shared_count&);
@@ -3599,7 +3609,7 @@ public:
    long use_count() const _NOEXCEPT {return __shared_owners_ + 1;}
 };

-class _LIBCPP_TYPE_VIS __shared_weak_count
+class __shared_weak_count
    : private __shared_count
 {
    long __shared_weak_owners_;
@@ -3744,10 +3754,10 @@ __shared_ptr_emplace<_Tp, _Alloc>::__on_zero_shared_weak() _NOEXCEPT
    __a.deallocate(this, 1);
 }

-template<class _Tp> class _LIBCPP_TYPE_VIS_ONLY enable_shared_from_this;
+template<class _Tp> class _LIBCPP_TYPE_VIS enable_shared_from_this;

 template<class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY shared_ptr
+class _LIBCPP_TYPE_VIS shared_ptr
 {
 public:
    typedef _Tp element_type;
@@ -3876,8 +3886,8 @@ public:
        <
            !is_array<_Yp>::value &&
            is_convertible<_Yp*, element_type*>::value,
-            shared_ptr
-        >::type&
+            shared_ptr&
+        >::type
        operator=(auto_ptr<_Yp>&& __r);
 #else  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
    template<class _Yp>
@@ -4016,8 +4026,8 @@ private:
    _LIBCPP_INLINE_VISIBILITY
    void __enable_weak_this(const void*) _NOEXCEPT {}

-    template <class _Up> friend class _LIBCPP_TYPE_VIS_ONLY shared_ptr;
-    template <class _Up> friend class _LIBCPP_TYPE_VIS_ONLY weak_ptr;
+    template <class _Up> friend class _LIBCPP_TYPE_VIS shared_ptr;
+    template <class _Up> friend class _LIBCPP_TYPE_VIS weak_ptr;
 };

 template<class _Tp>
@@ -4503,8 +4513,8 @@ typename enable_if
 <
    !is_array<_Yp>::value &&
    is_convertible<_Yp*, _Tp*>::value,
-    shared_ptr<_Tp>
->::type&
+    shared_ptr<_Tp>&
+>::type
 shared_ptr<_Tp>::operator=(auto_ptr<_Yp>&& __r)
 {
    shared_ptr(_VSTD::move(__r)).swap(*this);
@@ -4913,7 +4923,7 @@ get_deleter(const shared_ptr<_Tp>& __p) _NOEXCEPT
 #endif  // _LIBCPP_NO_RTTI

 template<class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY weak_ptr
+class _LIBCPP_TYPE_VIS weak_ptr
 {
 public:
    typedef _Tp element_type;
@@ -4988,8 +4998,8 @@ public:
        bool owner_before(const weak_ptr<_Up>& __r) const
        {return __cntrl_ < __r.__cntrl_;}

-    template <class _Up> friend class _LIBCPP_TYPE_VIS_ONLY weak_ptr;
-    template <class _Up> friend class _LIBCPP_TYPE_VIS_ONLY shared_ptr;
+    template <class _Up> friend class _LIBCPP_TYPE_VIS weak_ptr;
+    template <class _Up> friend class _LIBCPP_TYPE_VIS shared_ptr;
 };

 template<class _Tp>
@@ -5189,7 +5199,7 @@ weak_ptr<_Tp>::lock() const _NOEXCEPT
 template <class _Tp> struct owner_less;

 template <class _Tp>
-struct _LIBCPP_TYPE_VIS_ONLY owner_less<shared_ptr<_Tp> >
+struct _LIBCPP_TYPE_VIS owner_less<shared_ptr<_Tp> >
    : binary_function<shared_ptr<_Tp>, shared_ptr<_Tp>, bool>
 {
    typedef bool result_type;
@@ -5205,7 +5215,7 @@ struct _LIBCPP_TYPE_VIS_ONLY owner_less<shared_ptr<_Tp> >
 };

 template <class _Tp>
-struct _LIBCPP_TYPE_VIS_ONLY owner_less<weak_ptr<_Tp> >
+struct _LIBCPP_TYPE_VIS owner_less<weak_ptr<_Tp> >
    : binary_function<weak_ptr<_Tp>, weak_ptr<_Tp>, bool>
 {
    typedef bool result_type;
@@ -5221,7 +5231,7 @@ struct _LIBCPP_TYPE_VIS_ONLY owner_less<weak_ptr<_Tp> >
 };

 template<class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY enable_shared_from_this
+class _LIBCPP_TYPE_VIS enable_shared_from_this
 {
    mutable weak_ptr<_Tp> __weak_this_;
 protected:
@@ -5246,7 +5256,7 @@ public:
 };

 template <class _Tp>
-struct _LIBCPP_TYPE_VIS_ONLY hash<shared_ptr<_Tp> >
+struct _LIBCPP_TYPE_VIS hash<shared_ptr<_Tp> >
 {
    typedef shared_ptr<_Tp>      argument_type;
    typedef size_t               result_type;
@@ -5264,7 +5274,7 @@ operator<<(basic_ostream<_CharT, _Traits>& __os, shared_ptr<_Yp> const& __p);

 #if __has_feature(cxx_atomic)

-class _LIBCPP_TYPE_VIS __sp_mut
+class __sp_mut
 {
    void* __lx;
 public:
@@ -5408,11 +5418,11 @@ struct _LIBCPP_TYPE_VIS pointer_safety
    operator int() const {return __v_;}
 };

-_LIBCPP_FUNC_VIS void declare_reachable(void* __p);
-_LIBCPP_FUNC_VIS void declare_no_pointers(char* __p, size_t __n);
-_LIBCPP_FUNC_VIS void undeclare_no_pointers(char* __p, size_t __n);
-_LIBCPP_FUNC_VIS pointer_safety get_pointer_safety() _NOEXCEPT;
-_LIBCPP_FUNC_VIS void* __undeclare_reachable(void* __p);
+void declare_reachable(void* __p);
+void declare_no_pointers(char* __p, size_t __n);
+void undeclare_no_pointers(char* __p, size_t __n);
+pointer_safety get_pointer_safety() _NOEXCEPT;
+void* __undeclare_reachable(void* __p);

 template <class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY
@@ -5422,7 +5432,7 @@ undeclare_reachable(_Tp* __p)
    return static_cast<_Tp*>(__undeclare_reachable(__p));
 }

-_LIBCPP_FUNC_VIS void* align(size_t __align, size_t __sz, void*& __ptr, size_t& __space);
+void* align(size_t __align, size_t __sz, void*& __ptr, size_t& __space);

 _LIBCPP_END_NAMESPACE_STD

--- a/include/mutex
+++ b/include/mutex
@@ -441,7 +441,7 @@ void call_once(once_flag&, _Callable);

 #endif  // _LIBCPP_HAS_NO_VARIADICS

-struct _LIBCPP_TYPE_VIS_ONLY once_flag
+struct _LIBCPP_TYPE_VIS once_flag
 {
    _LIBCPP_INLINE_VISIBILITY
    _LIBCPP_CONSTEXPR
@@ -527,7 +527,7 @@ __call_once_proxy(void* __vp)
    (*__p)();
 }

-_LIBCPP_FUNC_VIS void __call_once(volatile unsigned long&, void*, void(*)(void*));
+void __call_once(volatile unsigned long&, void*, void(*)(void*));

 #ifndef _LIBCPP_HAS_NO_VARIADICS

--- a/include/new
+++ b/include/new
@@ -27,18 +27,6 @@ public:
    virtual const char* what() const noexcept;
 };

-class bad_array_length : public bad_alloc // C++14
-{
-public:
-    bad_array_length() noexcept;
-};
-
-class bad_array_new_length : public bad_alloc
-{
-public:
-    bad_array_new_length() noexcept;
-};
-
 struct nothrow_t {};
 extern const nothrow_t nothrow;
 typedef void (*new_handler)();
@@ -93,22 +81,7 @@ public:
    virtual const char* what() const _NOEXCEPT;
 };

-#if defined(_LIBCPP_BUILDING_NEW) || (_LIBCPP_STD_VER > 11)
-
-class _LIBCPP_EXCEPTION_ABI bad_array_length
-    : public bad_alloc
-{
-public:
-    bad_array_length() _NOEXCEPT;
-    virtual ~bad_array_length() _NOEXCEPT;
-    virtual const char* what() const _NOEXCEPT;
-};
-
-#define _LIBCPP_BAD_ARRAY_LENGTH_DEFINED
-
-#endif  // defined(_LIBCPP_BUILDING_NEW) || (_LIBCPP_STD_VER > 11)
-
-_LIBCPP_FUNC_VIS void __throw_bad_alloc();  // not in C++ spec
+void __throw_bad_alloc();  // not in C++ spec

 struct _LIBCPP_TYPE_VIS nothrow_t {};
 extern _LIBCPP_FUNC_VIS const nothrow_t nothrow;
@@ -118,33 +91,27 @@ _LIBCPP_FUNC_VIS new_handler get_new_handler() _NOEXCEPT;

 }  // std

-#if defined(_WIN32) && !defined(cxx_EXPORTS)
-# define _LIBCPP_NEW_DELETE_VIS _LIBCPP_FUNC_VIS_ONLY
-#else
-# define _LIBCPP_NEW_DELETE_VIS _LIBCPP_FUNC_VIS
-#endif
-
-_LIBCPP_NEW_DELETE_VIS void* operator new(std::size_t __sz)
+_LIBCPP_FUNC_VIS void* operator new(std::size_t __sz)
 #if !__has_feature(cxx_noexcept)
    throw(std::bad_alloc)
 #endif
 ;
-_LIBCPP_NEW_DELETE_VIS void* operator new(std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _NOALIAS;
-_LIBCPP_NEW_DELETE_VIS void  operator delete(void* __p) _NOEXCEPT;
-_LIBCPP_NEW_DELETE_VIS void  operator delete(void* __p, const std::nothrow_t&) _NOEXCEPT;
+_LIBCPP_FUNC_VIS void* operator new(std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _NOALIAS;
+_LIBCPP_FUNC_VIS void  operator delete(void* __p) _NOEXCEPT;
+_LIBCPP_FUNC_VIS void  operator delete(void* __p, const std::nothrow_t&) _NOEXCEPT;

-_LIBCPP_NEW_DELETE_VIS void* operator new[](std::size_t __sz)
+_LIBCPP_FUNC_VIS void* operator new[](std::size_t __sz)
 #if !__has_feature(cxx_noexcept)
    throw(std::bad_alloc)
 #endif
 ;
-_LIBCPP_NEW_DELETE_VIS void* operator new[](std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _NOALIAS;
-_LIBCPP_NEW_DELETE_VIS void  operator delete[](void* __p) _NOEXCEPT;
-_LIBCPP_NEW_DELETE_VIS void  operator delete[](void* __p, const std::nothrow_t&) _NOEXCEPT;
+_LIBCPP_FUNC_VIS void* operator new[](std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _NOALIAS;
+_LIBCPP_FUNC_VIS void  operator delete[](void* __p) _NOEXCEPT;
+_LIBCPP_FUNC_VIS void  operator delete[](void* __p, const std::nothrow_t&) _NOEXCEPT;

-inline _LIBCPP_INLINE_VISIBILITY void* operator new  (std::size_t, void* __p) _NOEXCEPT {return __p;}
-inline _LIBCPP_INLINE_VISIBILITY void* operator new[](std::size_t, void* __p) _NOEXCEPT {return __p;}
-inline _LIBCPP_INLINE_VISIBILITY void  operator delete  (void*, void*) _NOEXCEPT {}
-inline _LIBCPP_INLINE_VISIBILITY void  operator delete[](void*, void*) _NOEXCEPT {}
+_LIBCPP_INLINE_VISIBILITY inline void* operator new  (std::size_t, void* __p) _NOEXCEPT {return __p;}
+_LIBCPP_INLINE_VISIBILITY inline void* operator new[](std::size_t, void* __p) _NOEXCEPT {return __p;}
+_LIBCPP_INLINE_VISIBILITY inline void  operator delete  (void*, void*) _NOEXCEPT {}
+_LIBCPP_INLINE_VISIBILITY inline void  operator delete[](void*, void*) _NOEXCEPT {}

 #endif  // _LIBCPP_NEW
--- a/include/numeric
+++ b/include/numeric
@@ -157,7 +157,7 @@ adjacent_difference(_InputIterator __first, _InputIterator __last, _OutputIterat
        {
            typename iterator_traits<_InputIterator>::value_type __t2(*__first);
            *__result = __t2 - __t1;
-            __t1 = _VSTD::move(__t2);
+            __t1 = __t2;
        }
    }
    return __result;
@@ -177,7 +177,7 @@ adjacent_difference(_InputIterator __first, _InputIterator __last, _OutputIterat
        {
            typename iterator_traits<_InputIterator>::value_type __t2(*__first);
            *__result = __binary_op(__t2, __t1);
-            __t1 = _VSTD::move(__t2);
+            __t1 = __t2;
        }
    }
    return __result;
--- a/include/ostream
+++ b/include/ostream
@@ -32,7 +32,6 @@ public:
    virtual ~basic_ostream();

    // 27.7.2.3 Assign/swap
-    basic_ostream& operator=(const basic_ostream& rhs) = delete; // C++14
    basic_ostream& operator=(basic_ostream&& rhs);
    void swap(basic_ostream& rhs);

@@ -141,7 +140,7 @@ template <class charT, class traits, class T>
 _LIBCPP_BEGIN_NAMESPACE_STD

 template <class _CharT, class _Traits>
-class _LIBCPP_TYPE_VIS_ONLY basic_ostream
+class _LIBCPP_TYPE_VIS basic_ostream
    : virtual public basic_ios<_CharT, _Traits>
 {
 public:
@@ -162,9 +161,6 @@ protected:
 #endif

    // 27.7.2.3 Assign/swap
-#if _LIBCPP_STD_VER > 11
-    basic_ostream& operator=(const basic_ostream&) = delete;
-#endif
 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
    _LIBCPP_INLINE_VISIBILITY
    basic_ostream& operator=(basic_ostream&& __rhs);
@@ -173,7 +169,7 @@ protected:
 public:

    // 27.7.2.4 Prefix/suffix:
-    class _LIBCPP_TYPE_VIS_ONLY sentry;
+    class _LIBCPP_TYPE_VIS sentry;

    // 27.7.2.6 Formatted output:
    basic_ostream& operator<<(basic_ostream& (*__pf)(basic_ostream&));
@@ -211,7 +207,7 @@ protected:
 };

 template <class _CharT, class _Traits>
-class _LIBCPP_TYPE_VIS_ONLY basic_ostream<_CharT, _Traits>::sentry
+class _LIBCPP_TYPE_VIS basic_ostream<_CharT, _Traits>::sentry
 {
    bool __ok_;
    basic_ostream<_CharT, _Traits>& __os_;
@@ -1159,8 +1155,7 @@ inline _LIBCPP_INLINE_VISIBILITY
 basic_ostream<_CharT, _Traits>&
 basic_ostream<_CharT, _Traits>::seekp(pos_type __pos)
 {
-    sentry __s(*this);
-    if (__s)
+    if (!this->fail())
    {
        if (this->rdbuf()->pubseekpos(__pos, ios_base::out) == pos_type(-1))
            this->setstate(ios_base::failbit);
@@ -1173,12 +1168,8 @@ inline _LIBCPP_INLINE_VISIBILITY
 basic_ostream<_CharT, _Traits>&
 basic_ostream<_CharT, _Traits>::seekp(off_type __off, ios_base::seekdir __dir)
 {
-    sentry __s(*this);
-    if (__s)
-    {
-        if (this->rdbuf()->pubseekoff(__off, __dir, ios_base::out) == pos_type(-1))
-            this->setstate(ios_base::failbit);
-    }
+    if (!this->fail())
+        this->rdbuf()->pubseekoff(__off, __dir, ios_base::out);
    return *this;
 }

@@ -1287,8 +1278,8 @@ operator<<(basic_ostream<_CharT, _Traits>& __os, const bitset<_Size>& __x)
                         use_facet<ctype<_CharT> >(__os.getloc()).widen('1'));
 }

-_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_TYPE_VIS basic_ostream<char>)
-_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_TYPE_VIS basic_ostream<wchar_t>)
+_LIBCPP_EXTERN_TEMPLATE(class basic_ostream<char>)
+_LIBCPP_EXTERN_TEMPLATE(class basic_ostream<wchar_t>)

 _LIBCPP_END_NAMESPACE_STD

--- a/include/queue
+++ b/include/queue
@@ -177,7 +177,7 @@ template <class T, class Container, class Compare>

 _LIBCPP_BEGIN_NAMESPACE_STD

-template <class _Tp, class _Container> class _LIBCPP_TYPE_VIS_ONLY queue;
+template <class _Tp, class _Container> class _LIBCPP_TYPE_VIS queue;

 template <class _Tp, class _Container>
 _LIBCPP_INLINE_VISIBILITY
@@ -190,7 +190,7 @@ bool
 operator< (const queue<_Tp, _Container>& __x,const queue<_Tp, _Container>& __y);

 template <class _Tp, class _Container = deque<_Tp> >
-class _LIBCPP_TYPE_VIS_ONLY queue
+class _LIBCPP_TYPE_VIS queue
 {
 public:
    typedef _Container                               container_type;
@@ -376,14 +376,14 @@ swap(queue<_Tp, _Container>& __x, queue<_Tp, _Container>& __y)
 }

 template <class _Tp, class _Container, class _Alloc>
-struct _LIBCPP_TYPE_VIS_ONLY uses_allocator<queue<_Tp, _Container>, _Alloc>
+struct _LIBCPP_TYPE_VIS uses_allocator<queue<_Tp, _Container>, _Alloc>
    : public uses_allocator<_Container, _Alloc>
 {
 };

 template <class _Tp, class _Container = vector<_Tp>,
          class _Compare = less<typename _Container::value_type> >
-class _LIBCPP_TYPE_VIS_ONLY priority_queue
+class _LIBCPP_TYPE_VIS priority_queue
 {
 public:
    typedef _Container                               container_type;
@@ -707,7 +707,7 @@ swap(priority_queue<_Tp, _Container, _Compare>& __x,
 }

 template <class _Tp, class _Container, class _Compare, class _Alloc>
-struct _LIBCPP_TYPE_VIS_ONLY uses_allocator<priority_queue<_Tp, _Container, _Compare>, _Alloc>
+struct _LIBCPP_TYPE_VIS uses_allocator<priority_queue<_Tp, _Container, _Compare>, _Alloc>
    : public uses_allocator<_Container, _Alloc>
 {
 };
--- a/include/random
+++ b/include/random
@@ -1813,7 +1813,7 @@ struct __lce_ta<__a, __c, __m, (unsigned short)(~0), __b>
 };

 template <class _UIntType, _UIntType __a, _UIntType __c, _UIntType __m>
-class _LIBCPP_TYPE_VIS_ONLY linear_congruential_engine;
+class _LIBCPP_TYPE_VIS linear_congruential_engine;

 template <class _CharT, class _Traits,
          class _Up, _Up _Ap, _Up _Cp, _Up _Np>
@@ -1829,7 +1829,7 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
           linear_congruential_engine<_Up, _Ap, _Cp, _Np>& __x);

 template <class _UIntType, _UIntType __a, _UIntType __c, _UIntType __m>
-class _LIBCPP_TYPE_VIS_ONLY linear_congruential_engine
+class _LIBCPP_TYPE_VIS linear_congruential_engine
 {
 public:
    // types
@@ -1880,7 +1880,7 @@ public:
        seed(_Sseq& __q)
            {__seed(__q, integral_constant<unsigned,
                1 + (__m == 0 ? (sizeof(result_type) * __CHAR_BIT__ - 1)/32
-                             :  (__m > 0x100000000ull))>());}
+                             :  (__m-1) / 0x100000000ull)>());}

    // generating functions
    _LIBCPP_INLINE_VISIBILITY
@@ -1969,10 +1969,37 @@ linear_congruential_engine<_UIntType, __a, __c, __m>::__seed(_Sseq& __q,
    uint32_t __ar[__k+3];
    __q.generate(__ar, __ar + __k + 3);
    result_type __s = static_cast<result_type>((__ar[3] +
-                                              ((uint64_t)__ar[4] << 32)) % __m);
+                                                (uint64_t)__ar[4] << 32) % __m);
    __x_ = __c == 0 && __s == 0 ? result_type(1) : __s;
 }

+template <class _CharT, class _Traits>
+class __save_flags
+{
+    typedef basic_ios<_CharT, _Traits> __stream_type;
+    typedef typename __stream_type::fmtflags fmtflags;
+
+    __stream_type& __stream_;
+    fmtflags       __fmtflags_;
+    _CharT         __fill_;
+
+    __save_flags(const __save_flags&);
+    __save_flags& operator=(const __save_flags&);
+public:
+    _LIBCPP_INLINE_VISIBILITY
+    explicit __save_flags(__stream_type& __stream)
+        : __stream_(__stream),
+          __fmtflags_(__stream.flags()),
+          __fill_(__stream.fill())
+        {}
+    _LIBCPP_INLINE_VISIBILITY
+    ~__save_flags()
+    {
+        __stream_.flags(__fmtflags_);
+        __stream_.fill(__fill_);
+    }
+};
+
 template <class _CharT, class _Traits,
          class _UIntType, _UIntType __a, _UIntType __c, _UIntType __m>
 inline _LIBCPP_INLINE_VISIBILITY
@@ -2011,7 +2038,7 @@ typedef minstd_rand                                       default_random_engine;
 template <class _UIntType, size_t __w, size_t __n, size_t __m, size_t __r,
          _UIntType __a, size_t __u, _UIntType __d, size_t __s,
          _UIntType __b, size_t __t, _UIntType __c, size_t __l, _UIntType __f>
-class _LIBCPP_TYPE_VIS_ONLY mersenne_twister_engine;
+class _LIBCPP_TYPE_VIS mersenne_twister_engine;

 template <class _UI, size_t _Wp, size_t _Np, size_t _Mp, size_t _Rp,
          _UI _Ap, size_t _Up, _UI _Dp, size_t _Sp,
@@ -2053,7 +2080,7 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
 template <class _UIntType, size_t __w, size_t __n, size_t __m, size_t __r,
          _UIntType __a, size_t __u, _UIntType __d, size_t __s,
          _UIntType __b, size_t __t, _UIntType __c, size_t __l, _UIntType __f>
-class _LIBCPP_TYPE_VIS_ONLY mersenne_twister_engine
+class _LIBCPP_TYPE_VIS mersenne_twister_engine
 {
 public:
    // types
@@ -2499,7 +2526,7 @@ typedef mersenne_twister_engine<uint_fast64_t, 64, 312, 156, 31,
 // subtract_with_carry_engine

 template<class _UIntType, size_t __w, size_t __s, size_t __r>
-class _LIBCPP_TYPE_VIS_ONLY subtract_with_carry_engine;
+class _LIBCPP_TYPE_VIS subtract_with_carry_engine;

 template<class _UI, size_t _Wp, size_t _Sp, size_t _Rp>
 bool
@@ -2527,7 +2554,7 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
           subtract_with_carry_engine<_UI, _Wp, _Sp, _Rp>& __x);

 template<class _UIntType, size_t __w, size_t __s, size_t __r>
-class _LIBCPP_TYPE_VIS_ONLY subtract_with_carry_engine
+class _LIBCPP_TYPE_VIS subtract_with_carry_engine
 {
 public:
    // types
@@ -2810,7 +2837,7 @@ typedef subtract_with_carry_engine<uint_fast64_t, 48,  5, 12>     ranlux48_base;
 // discard_block_engine

 template<class _Engine, size_t __p, size_t __r>
-class _LIBCPP_TYPE_VIS_ONLY discard_block_engine
+class _LIBCPP_TYPE_VIS discard_block_engine
 {
    _Engine __e_;
    int     __n_;
@@ -2983,7 +3010,7 @@ typedef discard_block_engine<ranlux48_base, 389, 11> ranlux48;
 // independent_bits_engine

 template<class _Engine, size_t __w, class _UIntType>
-class _LIBCPP_TYPE_VIS_ONLY independent_bits_engine
+class _LIBCPP_TYPE_VIS independent_bits_engine
 {
    template <class _UI, _UI _R0, size_t _Wp, size_t _Mp>
    class __get_n
@@ -3246,7 +3273,7 @@ public:
 };

 template<class _Engine, size_t __k>
-class _LIBCPP_TYPE_VIS_ONLY shuffle_order_engine
+class _LIBCPP_TYPE_VIS shuffle_order_engine
 {
    static_assert(0 < __k, "shuffle_order_engine invalid parameters");
 public:
@@ -3475,9 +3502,7 @@ typedef shuffle_order_engine<minstd_rand0, 256>                         knuth_b;

 class _LIBCPP_TYPE_VIS random_device
 {
-#if !defined(_WIN32)
    int __f_;
-#endif // defined(_WIN32)
 public:
    // types
    typedef unsigned result_type;
@@ -3509,7 +3534,7 @@ private:

 // seed_seq

-class _LIBCPP_TYPE_VIS_ONLY seed_seq
+class _LIBCPP_TYPE_VIS seed_seq
 {
 public:
    // types
@@ -3523,7 +3548,7 @@ private:
 public:
    // constructors
    _LIBCPP_INLINE_VISIBILITY
-    seed_seq() _NOEXCEPT {}
+    seed_seq() {}
 #ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
    template<class _Tp>
        _LIBCPP_INLINE_VISIBILITY
@@ -3541,7 +3566,7 @@ public:

    // property functions
    _LIBCPP_INLINE_VISIBILITY
-    size_t size() const _NOEXCEPT {return __v_.size();}
+    size_t size() const {return __v_.size();}
    template<class _OutputIterator>
        _LIBCPP_INLINE_VISIBILITY
        void param(_OutputIterator __dest) const
@@ -3686,13 +3711,13 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
 // uniform_real_distribution

 template<class _RealType = double>
-class _LIBCPP_TYPE_VIS_ONLY uniform_real_distribution
+class _LIBCPP_TYPE_VIS uniform_real_distribution
 {
 public:
    // types
    typedef _RealType result_type;

-    class _LIBCPP_TYPE_VIS_ONLY param_type
+    class _LIBCPP_TYPE_VIS param_type
    {
        result_type __a_;
        result_type __b_;
@@ -3807,13 +3832,13 @@ operator>>(basic_istream<_CharT, _Traits>& __is,

 // bernoulli_distribution

-class _LIBCPP_TYPE_VIS_ONLY bernoulli_distribution
+class _LIBCPP_TYPE_VIS bernoulli_distribution
 {
 public:
    // types
    typedef bool result_type;

-    class _LIBCPP_TYPE_VIS_ONLY param_type
+    class _LIBCPP_TYPE_VIS param_type
    {
        double __p_;
    public:
@@ -3916,13 +3941,13 @@ operator>>(basic_istream<_CharT, _Traits>& __is, bernoulli_distribution& __x)
 // binomial_distribution

 template<class _IntType = int>
-class _LIBCPP_TYPE_VIS_ONLY binomial_distribution
+class _LIBCPP_TYPE_VIS binomial_distribution
 {
 public:
    // types
    typedef _IntType result_type;

-    class _LIBCPP_TYPE_VIS_ONLY param_type
+    class _LIBCPP_TYPE_VIS param_type
    {
        result_type __t_;
        double __p_;
@@ -4081,13 +4106,13 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
 // exponential_distribution

 template<class _RealType = double>
-class _LIBCPP_TYPE_VIS_ONLY exponential_distribution
+class _LIBCPP_TYPE_VIS exponential_distribution
 {
 public:
    // types
    typedef _RealType result_type;

-    class _LIBCPP_TYPE_VIS_ONLY param_type
+    class _LIBCPP_TYPE_VIS param_type
    {
        result_type __lambda_;
    public:
@@ -4196,13 +4221,13 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
 // normal_distribution

 template<class _RealType = double>
-class _LIBCPP_TYPE_VIS_ONLY normal_distribution
+class _LIBCPP_TYPE_VIS normal_distribution
 {
 public:
    // types
    typedef _RealType result_type;

-    class _LIBCPP_TYPE_VIS_ONLY param_type
+    class _LIBCPP_TYPE_VIS param_type
    {
        result_type __mean_;
        result_type __stddev_;
@@ -4364,13 +4389,13 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
 // lognormal_distribution

 template<class _RealType = double>
-class _LIBCPP_TYPE_VIS_ONLY lognormal_distribution
+class _LIBCPP_TYPE_VIS lognormal_distribution
 {
 public:
    // types
    typedef _RealType result_type;

-    class _LIBCPP_TYPE_VIS_ONLY param_type
+    class _LIBCPP_TYPE_VIS param_type
    {
        normal_distribution<result_type> __nd_;
    public:
@@ -4489,13 +4514,13 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
 // poisson_distribution

 template<class _IntType = int>
-class _LIBCPP_TYPE_VIS_ONLY poisson_distribution
+class _LIBCPP_TYPE_VIS poisson_distribution
 {
 public:
    // types
    typedef _IntType result_type;

-    class _LIBCPP_TYPE_VIS_ONLY param_type
+    class _LIBCPP_TYPE_VIS param_type
    {
        double __mean_;
        double __s_;
@@ -4720,13 +4745,13 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
 // weibull_distribution

 template<class _RealType = double>
-class _LIBCPP_TYPE_VIS_ONLY weibull_distribution
+class _LIBCPP_TYPE_VIS weibull_distribution
 {
 public:
    // types
    typedef _RealType result_type;

-    class _LIBCPP_TYPE_VIS_ONLY param_type
+    class _LIBCPP_TYPE_VIS param_type
    {
        result_type __a_;
        result_type __b_;
@@ -4834,13 +4859,13 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
 }

 template<class _RealType = double>
-class _LIBCPP_TYPE_VIS_ONLY extreme_value_distribution
+class _LIBCPP_TYPE_VIS extreme_value_distribution
 {
 public:
    // types
    typedef _RealType result_type;

-    class _LIBCPP_TYPE_VIS_ONLY param_type
+    class _LIBCPP_TYPE_VIS param_type
    {
        result_type __a_;
        result_type __b_;
@@ -4955,13 +4980,13 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
 // gamma_distribution

 template<class _RealType = double>
-class _LIBCPP_TYPE_VIS_ONLY gamma_distribution
+class _LIBCPP_TYPE_VIS gamma_distribution
 {
 public:
    // types
    typedef _RealType result_type;

-    class _LIBCPP_TYPE_VIS_ONLY param_type
+    class _LIBCPP_TYPE_VIS param_type
    {
        result_type __alpha_;
        result_type __beta_;
@@ -5127,13 +5152,13 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
 // negative_binomial_distribution

 template<class _IntType = int>
-class _LIBCPP_TYPE_VIS_ONLY negative_binomial_distribution
+class _LIBCPP_TYPE_VIS negative_binomial_distribution
 {
 public:
    // types
    typedef _IntType result_type;

-    class _LIBCPP_TYPE_VIS_ONLY param_type
+    class _LIBCPP_TYPE_VIS param_type
    {
        result_type __k_;
        double __p_;
@@ -5262,13 +5287,13 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
 // geometric_distribution

 template<class _IntType = int>
-class _LIBCPP_TYPE_VIS_ONLY geometric_distribution
+class _LIBCPP_TYPE_VIS geometric_distribution
 {
 public:
    // types
    typedef _IntType result_type;

-    class _LIBCPP_TYPE_VIS_ONLY param_type
+    class _LIBCPP_TYPE_VIS param_type
    {
        double __p_;
    public:
@@ -5364,13 +5389,13 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
 // chi_squared_distribution

 template<class _RealType = double>
-class _LIBCPP_TYPE_VIS_ONLY chi_squared_distribution
+class _LIBCPP_TYPE_VIS chi_squared_distribution
 {
 public:
    // types
    typedef _RealType result_type;

-    class _LIBCPP_TYPE_VIS_ONLY param_type
+    class _LIBCPP_TYPE_VIS param_type
    {
        result_type __n_;
    public:
@@ -5470,13 +5495,13 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
 // cauchy_distribution

 template<class _RealType = double>
-class _LIBCPP_TYPE_VIS_ONLY cauchy_distribution
+class _LIBCPP_TYPE_VIS cauchy_distribution
 {
 public:
    // types
    typedef _RealType result_type;

-    class _LIBCPP_TYPE_VIS_ONLY param_type
+    class _LIBCPP_TYPE_VIS param_type
    {
        result_type __a_;
        result_type __b_;
@@ -5593,13 +5618,13 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
 // fisher_f_distribution

 template<class _RealType = double>
-class _LIBCPP_TYPE_VIS_ONLY fisher_f_distribution
+class _LIBCPP_TYPE_VIS fisher_f_distribution
 {
 public:
    // types
    typedef _RealType result_type;

-    class _LIBCPP_TYPE_VIS_ONLY param_type
+    class _LIBCPP_TYPE_VIS param_type
    {
        result_type __m_;
        result_type __n_;
@@ -5715,13 +5740,13 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
 // student_t_distribution

 template<class _RealType = double>
-class _LIBCPP_TYPE_VIS_ONLY student_t_distribution
+class _LIBCPP_TYPE_VIS student_t_distribution
 {
 public:
    // types
    typedef _RealType result_type;

-    class _LIBCPP_TYPE_VIS_ONLY param_type
+    class _LIBCPP_TYPE_VIS param_type
    {
        result_type __n_;
    public:
@@ -5828,13 +5853,13 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
 // discrete_distribution

 template<class _IntType = int>
-class _LIBCPP_TYPE_VIS_ONLY discrete_distribution
+class _LIBCPP_TYPE_VIS discrete_distribution
 {
 public:
    // types
    typedef _IntType result_type;

-    class _LIBCPP_TYPE_VIS_ONLY param_type
+    class _LIBCPP_TYPE_VIS param_type
    {
        vector<double> __p_;
    public:
@@ -5903,8 +5928,8 @@ public:
        discrete_distribution(size_t __nw, double __xmin, double __xmax,
                              _UnaryOperation __fw)
        : __p_(__nw, __xmin, __xmax, __fw) {}
-    _LIBCPP_INLINE_VISIBILITY
    explicit discrete_distribution(const param_type& __p)
+    _LIBCPP_INLINE_VISIBILITY
        : __p_(__p) {}
    _LIBCPP_INLINE_VISIBILITY
    void reset() {}
@@ -6059,13 +6084,13 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
 // piecewise_constant_distribution

 template<class _RealType = double>
-class _LIBCPP_TYPE_VIS_ONLY piecewise_constant_distribution
+class _LIBCPP_TYPE_VIS piecewise_constant_distribution
 {
 public:
    // types
    typedef _RealType result_type;

-    class _LIBCPP_TYPE_VIS_ONLY param_type
+    class _LIBCPP_TYPE_VIS param_type
    {
        vector<result_type> __b_;
        vector<result_type> __densities_;
@@ -6383,13 +6408,13 @@ operator>>(basic_istream<_CharT, _Traits>& __is,
 // piecewise_linear_distribution

 template<class _RealType = double>
-class _LIBCPP_TYPE_VIS_ONLY piecewise_linear_distribution
+class _LIBCPP_TYPE_VIS piecewise_linear_distribution
 {
 public:
    // types
    typedef _RealType result_type;

-    class _LIBCPP_TYPE_VIS_ONLY param_type
+    class _LIBCPP_TYPE_VIS param_type
    {
        vector<result_type> __b_;
        vector<result_type> __densities_;
--- a/include/ratio
+++ b/include/ratio
@@ -231,7 +231,7 @@ public:
 };

 template <intmax_t _Num, intmax_t _Den = 1>
-class _LIBCPP_TYPE_VIS_ONLY ratio
+class _LIBCPP_TYPE_VIS ratio
 {
    static_assert(__static_abs<_Num>::value >= 0, "ratio numerator is out of range");
    static_assert(_Den != 0, "ratio divide by 0");
@@ -292,7 +292,7 @@ template <class _R1, class _R2> using ratio_multiply
 #else  // _LIBCPP_HAS_NO_TEMPLATE_ALIASES

 template <class _R1, class _R2>
-struct _LIBCPP_TYPE_VIS_ONLY ratio_multiply
+struct _LIBCPP_TYPE_VIS ratio_multiply
    : public __ratio_multiply<_R1, _R2>::type {};

 #endif  // _LIBCPP_HAS_NO_TEMPLATE_ALIASES
@@ -319,7 +319,7 @@ template <class _R1, class _R2> using ratio_divide
 #else  // _LIBCPP_HAS_NO_TEMPLATE_ALIASES

 template <class _R1, class _R2>
-struct _LIBCPP_TYPE_VIS_ONLY ratio_divide
+struct _LIBCPP_TYPE_VIS ratio_divide
    : public __ratio_divide<_R1, _R2>::type {};

 #endif  // _LIBCPP_HAS_NO_TEMPLATE_ALIASES
@@ -354,7 +354,7 @@ template <class _R1, class _R2> using ratio_add
 #else  // _LIBCPP_HAS_NO_TEMPLATE_ALIASES

 template <class _R1, class _R2>
-struct _LIBCPP_TYPE_VIS_ONLY ratio_add
+struct _LIBCPP_TYPE_VIS ratio_add
    : public __ratio_add<_R1, _R2>::type {};

 #endif  // _LIBCPP_HAS_NO_TEMPLATE_ALIASES
@@ -389,7 +389,7 @@ template <class _R1, class _R2> using ratio_subtract
 #else  // _LIBCPP_HAS_NO_TEMPLATE_ALIASES

 template <class _R1, class _R2>
-struct _LIBCPP_TYPE_VIS_ONLY ratio_subtract
+struct _LIBCPP_TYPE_VIS ratio_subtract
    : public __ratio_subtract<_R1, _R2>::type {};

 #endif  // _LIBCPP_HAS_NO_TEMPLATE_ALIASES
@@ -397,11 +397,11 @@ struct _LIBCPP_TYPE_VIS_ONLY ratio_subtract
 // ratio_equal

 template <class _R1, class _R2>
-struct _LIBCPP_TYPE_VIS_ONLY ratio_equal
+struct _LIBCPP_TYPE_VIS ratio_equal
    : public integral_constant<bool, _R1::num == _R2::num && _R1::den == _R2::den> {};

 template <class _R1, class _R2>
-struct _LIBCPP_TYPE_VIS_ONLY ratio_not_equal
+struct _LIBCPP_TYPE_VIS ratio_not_equal
    : public integral_constant<bool, !ratio_equal<_R1, _R2>::value> {};

 // ratio_less
@@ -460,19 +460,19 @@ struct __ratio_less<_R1, _R2, -1LL, -1LL>
 };

 template <class _R1, class _R2>
-struct _LIBCPP_TYPE_VIS_ONLY ratio_less
+struct _LIBCPP_TYPE_VIS ratio_less
    : public integral_constant<bool, __ratio_less<_R1, _R2>::value> {};

 template <class _R1, class _R2>
-struct _LIBCPP_TYPE_VIS_ONLY ratio_less_equal
+struct _LIBCPP_TYPE_VIS ratio_less_equal
    : public integral_constant<bool, !ratio_less<_R2, _R1>::value> {};

 template <class _R1, class _R2>
-struct _LIBCPP_TYPE_VIS_ONLY ratio_greater
+struct _LIBCPP_TYPE_VIS ratio_greater
    : public integral_constant<bool, ratio_less<_R2, _R1>::value> {};

 template <class _R1, class _R2>
-struct _LIBCPP_TYPE_VIS_ONLY ratio_greater_equal
+struct _LIBCPP_TYPE_VIS ratio_greater_equal
    : public integral_constant<bool, !ratio_less<_R1, _R2>::value> {};

 template <class _R1, class _R2>
--- a/include/regex
+++ b/include/regex
@@ -925,7 +925,7 @@ public:
 };

 template <class _CharT>
-struct _LIBCPP_TYPE_VIS_ONLY regex_traits
+struct _LIBCPP_TYPE_VIS regex_traits
 {
 public:
    typedef _CharT                  char_type;
@@ -970,7 +970,7 @@ public:
    bool isctype(char_type __c, char_class_type __m) const;
    _LIBCPP_INLINE_VISIBILITY
    int value(char_type __ch, int __radix) const
-        {return __regex_traits_value(__ch, __radix);}
+        {return __value(__ch, __radix);}
    locale_type imbue(locale_type __l);
    _LIBCPP_INLINE_VISIBILITY
    locale_type getloc()const {return __loc_;}
@@ -1001,11 +1001,11 @@ private:
        __lookup_classname(_ForwardIterator __f, _ForwardIterator __l,
                           bool __icase, wchar_t) const;

-    static int __regex_traits_value(unsigned char __ch, int __radix);
+    static int __value(unsigned char __ch, int __radix);
    _LIBCPP_INLINE_VISIBILITY
-    int __regex_traits_value(char __ch, int __radix) const
-        {return __regex_traits_value(static_cast<unsigned char>(__ch), __radix);}
-    int __regex_traits_value(wchar_t __ch, int __radix) const;
+    int __value(char __ch, int __radix) const
+        {return __value(static_cast<unsigned char>(__ch), __radix);}
+    int __value(wchar_t __ch, int __radix) const;
 };

 template <class _CharT>
@@ -1100,7 +1100,7 @@ regex_traits<_CharT>::__transform_primary(_ForwardIterator __f,

 // lookup_collatename is very FreeBSD-specific

-_LIBCPP_FUNC_VIS string __get_collation_name(const char* __s);
+string __get_collation_name(const char* __s);

 template <class _CharT>
 template <class _ForwardIterator>
@@ -1161,7 +1161,7 @@ regex_traits<_CharT>::__lookup_collatename(_ForwardIterator __f,

 // lookup_classname

-ctype_base::mask _LIBCPP_FUNC_VIS __get_classname(const char* __s, bool __icase);
+ctype_base::mask __get_classname(const char* __s, bool __icase);

 template <class _CharT>
 template <class _ForwardIterator>
@@ -1207,7 +1207,7 @@ regex_traits<_CharT>::isctype(char_type __c, char_class_type __m) const

 template <class _CharT>
 int
-regex_traits<_CharT>::__regex_traits_value(unsigned char __ch, int __radix)
+regex_traits<_CharT>::__value(unsigned char __ch, int __radix)
 {
    if ((__ch & 0xF8u) == 0x30)  // '0' <= __ch && __ch <= '7'
        return __ch - '0';
@@ -1228,18 +1228,18 @@ regex_traits<_CharT>::__regex_traits_value(unsigned char __ch, int __radix)
 template <class _CharT>
 inline _LIBCPP_INLINE_VISIBILITY
 int
-regex_traits<_CharT>::__regex_traits_value(wchar_t __ch, int __radix) const
+regex_traits<_CharT>::__value(wchar_t __ch, int __radix) const
 {
-    return __regex_traits_value(static_cast<unsigned char>(__ct_->narrow(__ch, char_type())), __radix);
+    return __value(static_cast<unsigned char>(__ct_->narrow(__ch, char_type())), __radix);
 }

 template <class _CharT> class __node;

-template <class _BidirectionalIterator> class _LIBCPP_TYPE_VIS_ONLY sub_match;
+template <class _BidirectionalIterator> class _LIBCPP_TYPE_VIS sub_match;

 template <class _BidirectionalIterator,
          class _Allocator = allocator<sub_match<_BidirectionalIterator> > >
-class _LIBCPP_TYPE_VIS_ONLY match_results;
+class _LIBCPP_TYPE_VIS match_results;

 template <class _CharT>
 struct __state
@@ -2014,9 +2014,6 @@ public:
    virtual void __exec(__state&) const;
 };

-template <> _LIBCPP_FUNC_VIS void __match_any_but_newline<char>::__exec(__state&) const;
-template <> _LIBCPP_FUNC_VIS void __match_any_but_newline<wchar_t>::__exec(__state&) const;
-
 // __match_char

 template <class _CharT>
@@ -2418,7 +2415,7 @@ __exit:
 template <class _CharT, class _Traits> class __lookahead;

 template <class _CharT, class _Traits = regex_traits<_CharT> >
-class _LIBCPP_TYPE_VIS_ONLY basic_regex
+class _LIBCPP_TYPE_VIS basic_regex
 {
 public:
    // types:
@@ -2772,7 +2769,7 @@ private:
    void __push_end_marked_subexpression(unsigned);
    void __push_empty();
    void __push_word_boundary(bool);
-    void __push_lookahead(const basic_regex&, bool, unsigned);
+    void __push_lookahead(const basic_regex&, bool);

    template <class _Allocator>
        bool
@@ -2846,15 +2843,6 @@ private:
                 const basic_regex<_Cp, _Tp>& __e,
                 regex_constants::match_flag_type __flags);

-    template <class _Iter, class _Ap, class _Cp, class _Tp>
-    friend
-    bool
-    regex_search(__wrap_iter<_Iter> __first,
-                 __wrap_iter<_Iter> __last,
-                 match_results<__wrap_iter<_Iter>, _Ap>& __m,
-                 const basic_regex<_Cp, _Tp>& __e,
-                 regex_constants::match_flag_type __flags);
-
    template <class, class> friend class __lookahead;
 };

@@ -2910,7 +2898,6 @@ class __lookahead
    typedef __owns_one_state<_CharT> base;

    basic_regex<_CharT, _Traits> __exp_;
-    unsigned __mexp_;
    bool __invert_;

    __lookahead(const __lookahead&);
@@ -2919,8 +2906,8 @@ public:
    typedef _VSTD::__state<_CharT> __state;

    _LIBCPP_INLINE_VISIBILITY
-    __lookahead(const basic_regex<_CharT, _Traits>& __exp, bool __invert, __node<_CharT>* __s, unsigned __mexp)
-        : base(__s), __exp_(__exp), __invert_(__invert), __mexp_(__mexp) {}
+    __lookahead(const basic_regex<_CharT, _Traits>& __exp, bool __invert, __node<_CharT>* __s)
+        : base(__s), __exp_(__exp), __invert_(__invert) {}

    virtual void __exec(__state&) const;
 };
@@ -2934,14 +2921,11 @@ __lookahead<_CharT, _Traits>::__exec(__state& __s) const
    bool __matched = __exp_.__match_at_start_ecma(__s.__current_, __s.__last_,
                                                  __m,
                                                  __s.__flags_ | regex_constants::match_continuous,
-                                                  __s.__at_first_ && __s.__current_ == __s.__first_);
+                                                  true);
    if (__matched != __invert_)
    {
        __s.__do_ = __state::__accept_but_not_consume;
        __s.__node_ = this->first();
-        for (unsigned __i = 1; __i < __m.size(); ++__i) {
-            __s.__sub_matches_[__mexp_ + __i - 1] = __m.__matches_[__i];
-        }
    }
    else
    {
@@ -3436,7 +3420,6 @@ basic_regex<_CharT, _Traits>::__parse_QUOTED_CHAR_ERE(_ForwardIterator __first,
                case '+':
                case '?':
                case '{':
-                case '}':
                    __push_char(*__temp);
                    __first = ++__temp;
                    break;
@@ -3785,7 +3768,7 @@ basic_regex<_CharT, _Traits>::__parse_expression_term(_ForwardIterator __first,
                }
                __ml->__add_range(_VSTD::move(__start_range), _VSTD::move(__end_range));
            }
-            else if (!__start_range.empty())
+            else
            {
                if (__start_range.size() == 1)
                    __ml->__add_char(__start_range[0]);
@@ -3793,7 +3776,7 @@ basic_regex<_CharT, _Traits>::__parse_expression_term(_ForwardIterator __first,
                    __ml->__add_digraph(__start_range[0], __start_range[1]);
            }
        }
-        else if (!__start_range.empty())
+        else
        {
            if (__start_range.size() == 1)
                __ml->__add_char(__start_range[0]);
@@ -3920,7 +3903,7 @@ basic_regex<_CharT, _Traits>::__parse_awk_escape(_ForwardIterator __first,
        {
            __val = 8 * __val + *__first - '0';
            if (++__first != __last && ('0' <= *__first && *__first <= '7'))
-                __val = 8 * __val + *__first++ - '0';
+                __val = 8 * __val + *__first - '0';
        }
        if (__str)
            *__str = _CharT(__val);
@@ -4175,9 +4158,7 @@ basic_regex<_CharT, _Traits>::__parse_assertion(_ForwardIterator __first,
                                basic_regex __exp;
                                __exp.__flags_ = __flags_;
                                __temp = __exp.__parse(++__temp, __last);
-                                unsigned __mexp = __exp.__marked_count_;
-                                __push_lookahead(_VSTD::move(__exp), false, __marked_count_);
-                                __marked_count_ += __mexp;
+                                __push_lookahead(_VSTD::move(__exp), false);
 #ifndef _LIBCPP_NO_EXCEPTIONS
                                if (__temp == __last || *__temp != ')')
                                    throw regex_error(regex_constants::error_paren);
@@ -4190,9 +4171,7 @@ basic_regex<_CharT, _Traits>::__parse_assertion(_ForwardIterator __first,
                                basic_regex __exp;
                                __exp.__flags_ = __flags_;
                                __temp = __exp.__parse(++__temp, __last);
-                                unsigned __mexp = __exp.__marked_count_;
-                                __push_lookahead(_VSTD::move(__exp), true, __marked_count_);
-                                __marked_count_ += __mexp;
+                                __push_lookahead(_VSTD::move(__exp), true);
 #ifndef _LIBCPP_NO_EXCEPTIONS
                                if (__temp == __last || *__temp != ')')
                                    throw regex_error(regex_constants::error_paren);
@@ -4429,8 +4408,7 @@ basic_regex<_CharT, _Traits>::__parse_character_escape(_ForwardIterator __first,
        case 'c':
            if ((__t = _VSTD::next(__first)) != __last)
            {
-                if (('A' <= *__t && *__t <= 'Z') || 
-                    ('a' <= *__t && *__t <= 'z'))
+                if ('A' <= *__t <= 'Z' || 'a' <= *__t <= 'z')
                {
                    if (__str)
                        *__str = _CharT(*__t % 32);
@@ -4438,15 +4416,7 @@ basic_regex<_CharT, _Traits>::__parse_character_escape(_ForwardIterator __first,
                        __push_char(_CharT(*__t % 32));
                    __first = ++__t;
                }
-#ifndef _LIBCPP_NO_EXCEPTIONS
-                else 
-                    throw regex_error(regex_constants::error_escape);
-#endif  // _LIBCPP_NO_EXCEPTIONS
            }
-#ifndef _LIBCPP_NO_EXCEPTIONS
-            else
-                throw regex_error(regex_constants::error_escape);
-#endif  // _LIBCPP_NO_EXCEPTIONS
            break;
        case 'u':
            ++__first;
@@ -4511,7 +4481,7 @@ basic_regex<_CharT, _Traits>::__parse_character_escape(_ForwardIterator __first,
                ++__first;
            }
 #ifndef _LIBCPP_NO_EXCEPTIONS
-            else
+            else if (__str)
                throw regex_error(regex_constants::error_escape);
 #endif  // _LIBCPP_NO_EXCEPTIONS
            break;
@@ -4770,11 +4740,10 @@ basic_regex<_CharT, _Traits>::__start_matching_list(bool __negate)
 template <class _CharT, class _Traits>
 void
 basic_regex<_CharT, _Traits>::__push_lookahead(const basic_regex& __exp,
-                                               bool __invert,
-                                               unsigned __mexp)
+                                               bool __invert)
 {
    __end_->first() = new __lookahead<_CharT, _Traits>(__exp, __invert,
-                                                           __end_->first(), __mexp);
+                                                           __end_->first());
    __end_ = static_cast<__owns_one_state<_CharT>*>(__end_->first());
 }

@@ -4784,7 +4753,7 @@ typedef basic_regex<wchar_t> wregex;
 // sub_match

 template <class _BidirectionalIterator>
-class _LIBCPP_TYPE_VIS_ONLY sub_match
+class _LIBCPP_TYPE_VIS sub_match
    : public pair<_BidirectionalIterator, _BidirectionalIterator>
 {
 public:
@@ -5207,7 +5176,7 @@ operator<<(basic_ostream<_CharT, _ST>& __os, const sub_match<_BiIter>& __m)
 }

 template <class _BidirectionalIterator, class _Allocator>
-class _LIBCPP_TYPE_VIS_ONLY match_results
+class _LIBCPP_TYPE_VIS match_results
 {
 public:
    typedef _Allocator                                        allocator_type;
@@ -5794,8 +5763,7 @@ basic_regex<_CharT, _Traits>::__search(
 {
    __m.__init(1 + mark_count(), __first, __last,
                                    __flags & regex_constants::__no_update_pos);
-    if (__match_at_start(__first, __last, __m, __flags, 
-                                    !(__flags & regex_constants::__no_update_pos)))
+    if (__match_at_start(__first, __last, __m, __flags, true))
    {
        __m.__prefix_.second = __m[0].first;
        __m.__prefix_.matched = __m.__prefix_.first != __m.__prefix_.second;
@@ -5832,25 +5800,9 @@ regex_search(_BidirectionalIterator __first, _BidirectionalIterator __last,
             const basic_regex<_CharT, _Traits>& __e,
             regex_constants::match_flag_type __flags = regex_constants::match_default)
 {
-    int __offset = (__flags & regex_constants::match_prev_avail) ? 1 : 0;
-    basic_string<_CharT> __s(_VSTD::prev(__first, __offset), __last);
+    basic_string<_CharT> __s(__first, __last);
    match_results<const _CharT*> __mc;
-    bool __r = __e.__search(__s.data() + __offset, __s.data() + __s.size(), __mc, __flags);
-    __m.__assign(__first, __last, __mc, __flags & regex_constants::__no_update_pos);
-    return __r;
-}
-
-template <class _Iter, class _Allocator, class _CharT, class _Traits>
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-regex_search(__wrap_iter<_Iter> __first,
-             __wrap_iter<_Iter> __last,
-             match_results<__wrap_iter<_Iter>, _Allocator>& __m,
-             const basic_regex<_CharT, _Traits>& __e,
-             regex_constants::match_flag_type __flags = regex_constants::match_default)
-{
-    match_results<const _CharT*> __mc;
-    bool __r = __e.__search(__first.base(), __last.base(), __mc, __flags);
+    bool __r = __e.__search(__s.data(), __s.data() + __s.size(), __mc, __flags);
    __m.__assign(__first, __last, __mc, __flags & regex_constants::__no_update_pos);
    return __r;
 }
@@ -6010,7 +5962,7 @@ regex_match(const basic_string<_CharT, _ST, _SA>& __s,
 template <class _BidirectionalIterator,
          class _CharT = typename iterator_traits<_BidirectionalIterator>::value_type,
          class _Traits = regex_traits<_CharT> >
-class _LIBCPP_TYPE_VIS_ONLY regex_iterator
+class _LIBCPP_TYPE_VIS regex_iterator
 {
 public:
    typedef basic_regex<_CharT, _Traits>          regex_type;
@@ -6092,7 +6044,7 @@ regex_iterator<_BidirectionalIterator, _CharT, _Traits>::operator++()
 {
    __flags_ |= regex_constants::__no_update_pos;
    _BidirectionalIterator __start = __match_[0].second;
-    if (__match_.empty())
+    if (__match_.length() == 0)
    {
        if (__start == __end_)
        {
@@ -6122,7 +6074,7 @@ typedef regex_iterator<wstring::const_iterator> wsregex_iterator;
 template <class _BidirectionalIterator,
          class _CharT = typename iterator_traits<_BidirectionalIterator>::value_type,
          class _Traits = regex_traits<_CharT> >
-class _LIBCPP_TYPE_VIS_ONLY regex_token_iterator
+class _LIBCPP_TYPE_VIS regex_token_iterator
 {
 public:
    typedef basic_regex<_CharT, _Traits>      regex_type;
--- a/include/scoped_allocator
+++ b/include/scoped_allocator
@@ -365,7 +365,7 @@ struct __outermost<_Alloc, true>
 };

 template <class _OuterAlloc, class... _InnerAllocs>
-class _LIBCPP_TYPE_VIS_ONLY scoped_allocator_adaptor<_OuterAlloc, _InnerAllocs...>
+class _LIBCPP_TYPE_VIS scoped_allocator_adaptor<_OuterAlloc, _InnerAllocs...>
    : public __scoped_allocator_storage<_OuterAlloc, _InnerAllocs...>
 {
    typedef __scoped_allocator_storage<_OuterAlloc, _InnerAllocs...> base;
--- a/include/set
+++ b/include/set
@@ -66,11 +66,6 @@ public:
    set(initializer_list<value_type> il, const value_compare& comp = value_compare());
    set(initializer_list<value_type> il, const value_compare& comp,
        const allocator_type& a);
-    template <class InputIterator>
-        set(InputIterator first, InputIterator last, const allocator_type& a)
-            : set(first, last, Compare(), a) {}  // C++14
-    set(initializer_list<value_type> il, const allocator_type& a)
-        : set(il, Compare(), a) {}  // C++14
    ~set();

    set& operator=(const set& s);
@@ -134,33 +129,13 @@ public:
    // set operations:
          iterator find(const key_type& k);
    const_iterator find(const key_type& k) const;
-    template<typename K>
-        iterator find(const K& x);
-    template<typename K>
-        const_iterator find(const K& x) const;  // C++14
-    template<typename K>
-      size_type count(const K& x) const;        // C++14
-
    size_type      count(const key_type& k) const;
          iterator lower_bound(const key_type& k);
    const_iterator lower_bound(const key_type& k) const;
-    template<typename K>
-        iterator lower_bound(const K& x);              // C++14
-    template<typename K>
-        const_iterator lower_bound(const K& x) const;  // C++14
-
          iterator upper_bound(const key_type& k);
    const_iterator upper_bound(const key_type& k) const;
-    template<typename K>
-        iterator upper_bound(const K& x);              // C++14
-    template<typename K>
-        const_iterator upper_bound(const K& x) const;  // C++14
    pair<iterator,iterator>             equal_range(const key_type& k);
    pair<const_iterator,const_iterator> equal_range(const key_type& k) const;
-    template<typename K>
-        pair<iterator,iterator>             equal_range(const K& x);        // C++14
-    template<typename K>
-        pair<const_iterator,const_iterator> equal_range(const K& x) const;  // C++14
 };

 template <class Key, class Compare, class Allocator>
@@ -247,11 +222,6 @@ public:
    multiset(initializer_list<value_type> il, const value_compare& comp = value_compare());
    multiset(initializer_list<value_type> il, const value_compare& comp,
             const allocator_type& a);
-    template <class InputIterator>
-        multiset(InputIterator first, InputIterator last, const allocator_type& a)
-            : set(first, last, Compare(), a) {}  // C++14
-    multiset(initializer_list<value_type> il, const allocator_type& a)
-        : set(il, Compare(), a) {}  // C++14
    ~multiset();

    multiset& operator=(const multiset& s);
@@ -315,32 +285,13 @@ public:
    // set operations:
          iterator find(const key_type& k);
    const_iterator find(const key_type& k) const;
-    template<typename K>
-        iterator find(const K& x);
-    template<typename K>
-        const_iterator find(const K& x) const;  // C++14
-
    size_type      count(const key_type& k) const;
          iterator lower_bound(const key_type& k);
    const_iterator lower_bound(const key_type& k) const;
-    template<typename K>
-        iterator lower_bound(const K& x);              // C++14
-    template<typename K>
-        const_iterator lower_bound(const K& x) const;  // C++14
-
          iterator upper_bound(const key_type& k);
    const_iterator upper_bound(const key_type& k) const;
-    template<typename K>
-        iterator upper_bound(const K& x);              // C++14
-    template<typename K>
-        const_iterator upper_bound(const K& x) const;  // C++14
-
    pair<iterator,iterator>             equal_range(const key_type& k);
    pair<const_iterator,const_iterator> equal_range(const key_type& k) const;
-    template<typename K>
-        pair<iterator,iterator>             equal_range(const K& x);        // C++14
-    template<typename K>
-        pair<const_iterator,const_iterator> equal_range(const K& x) const;  // C++14
 };

 template <class Key, class Compare, class Allocator>
@@ -395,7 +346,7 @@ _LIBCPP_BEGIN_NAMESPACE_STD

 template <class _Key, class _Compare = less<_Key>,
          class _Allocator = allocator<_Key> >
-class _LIBCPP_TYPE_VIS_ONLY set
+class _LIBCPP_TYPE_VIS set
 {
 public:
    // types:
@@ -452,13 +403,6 @@ public:
            insert(__f, __l);
        }

-#if _LIBCPP_STD_VER > 11
-        template <class _InputIterator>
-        _LIBCPP_INLINE_VISIBILITY 
-        set(_InputIterator __f, _InputIterator __l, const allocator_type& __a)
-            : set(__f, __l, key_compare(), __a) {}
-#endif
-
    _LIBCPP_INLINE_VISIBILITY
    set(const set& __s)
        : __tree_(__s.__tree_)
@@ -511,12 +455,6 @@ public:
            insert(__il.begin(), __il.end());
        }

-#if _LIBCPP_STD_VER > 11
-    _LIBCPP_INLINE_VISIBILITY 
-    set(initializer_list<value_type> __il, const allocator_type& __a)
-        : set(__il, key_compare(), __a) {}
-#endif
-
    _LIBCPP_INLINE_VISIBILITY
    set& operator=(initializer_list<value_type> __il)
        {
@@ -641,17 +579,6 @@ public:
    iterator find(const key_type& __k)             {return __tree_.find(__k);}
    _LIBCPP_INLINE_VISIBILITY
    const_iterator find(const key_type& __k) const {return __tree_.find(__k);}
-#if _LIBCPP_STD_VER > 11
-    template <typename _K2>
-    _LIBCPP_INLINE_VISIBILITY
-    typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
-    find(const _K2& __k)                           {return __tree_.find(__k);}
-    template <typename _K2>
-    _LIBCPP_INLINE_VISIBILITY
-    typename enable_if<__is_transparent<_Compare, _K2>::value,const_iterator>::type
-    find(const _K2& __k) const                     {return __tree_.find(__k);}
-#endif
-
    _LIBCPP_INLINE_VISIBILITY
    size_type      count(const key_type& __k) const
        {return __tree_.__count_unique(__k);}
@@ -661,51 +588,18 @@ public:
    _LIBCPP_INLINE_VISIBILITY
    const_iterator lower_bound(const key_type& __k) const
        {return __tree_.lower_bound(__k);}
-#if _LIBCPP_STD_VER > 11
-    template <typename _K2>
-    _LIBCPP_INLINE_VISIBILITY
-    typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
-    lower_bound(const _K2& __k)       {return __tree_.lower_bound(__k);}
-
-    template <typename _K2>
-    _LIBCPP_INLINE_VISIBILITY
-    typename enable_if<__is_transparent<_Compare, _K2>::value,const_iterator>::type
-    lower_bound(const _K2& __k) const {return __tree_.lower_bound(__k);}
-#endif
-
    _LIBCPP_INLINE_VISIBILITY
    iterator upper_bound(const key_type& __k)
        {return __tree_.upper_bound(__k);}
    _LIBCPP_INLINE_VISIBILITY
    const_iterator upper_bound(const key_type& __k) const
        {return __tree_.upper_bound(__k);}
-#if _LIBCPP_STD_VER > 11
-    template <typename _K2>
-    _LIBCPP_INLINE_VISIBILITY
-    typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
-    upper_bound(const _K2& __k)       {return __tree_.upper_bound(__k);}
-    template <typename _K2>
-    _LIBCPP_INLINE_VISIBILITY
-    typename enable_if<__is_transparent<_Compare, _K2>::value,const_iterator>::type
-    upper_bound(const _K2& __k) const {return __tree_.upper_bound(__k);}
-#endif
-
    _LIBCPP_INLINE_VISIBILITY
    pair<iterator,iterator> equal_range(const key_type& __k)
        {return __tree_.__equal_range_unique(__k);}
    _LIBCPP_INLINE_VISIBILITY
    pair<const_iterator,const_iterator> equal_range(const key_type& __k) const
        {return __tree_.__equal_range_unique(__k);}
-#if _LIBCPP_STD_VER > 11
-    template <typename _K2>
-    _LIBCPP_INLINE_VISIBILITY
-    typename enable_if<__is_transparent<_Compare, _K2>::value,pair<iterator,iterator>>::type
-    equal_range(const _K2& __k)       {return __tree_.__equal_range_unique(__k);}
-    template <typename _K2>
-    _LIBCPP_INLINE_VISIBILITY
-    typename enable_if<__is_transparent<_Compare, _K2>::value,pair<const_iterator,const_iterator>>::type
-    equal_range(const _K2& __k) const {return __tree_.__equal_range_unique(__k);}
-#endif
 };

 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
@@ -791,7 +685,7 @@ swap(set<_Key, _Compare, _Allocator>& __x,

 template <class _Key, class _Compare = less<_Key>,
          class _Allocator = allocator<_Key> >
-class _LIBCPP_TYPE_VIS_ONLY multiset
+class _LIBCPP_TYPE_VIS multiset
 {
 public:
    // types:
@@ -840,13 +734,6 @@ public:
            insert(__f, __l);
        }

-#if _LIBCPP_STD_VER > 11
-        template <class _InputIterator>
-        _LIBCPP_INLINE_VISIBILITY 
-        multiset(_InputIterator __f, _InputIterator __l, const allocator_type& __a)
-            : multiset(__f, __l, key_compare(), __a) {}
-#endif
-
    template <class _InputIterator>
        _LIBCPP_INLINE_VISIBILITY
        multiset(_InputIterator __f, _InputIterator __l,
@@ -906,12 +793,6 @@ public:
            insert(__il.begin(), __il.end());
        }

-#if _LIBCPP_STD_VER > 11
-    _LIBCPP_INLINE_VISIBILITY 
-    multiset(initializer_list<value_type> __il, const allocator_type& __a)
-        : multiset(__il, key_compare(), __a) {}
-#endif
-
    _LIBCPP_INLINE_VISIBILITY
    multiset& operator=(initializer_list<value_type> __il)
        {
@@ -1036,72 +917,27 @@ public:
    iterator find(const key_type& __k)             {return __tree_.find(__k);}
    _LIBCPP_INLINE_VISIBILITY
    const_iterator find(const key_type& __k) const {return __tree_.find(__k);}
-#if _LIBCPP_STD_VER > 11
-    template <typename _K2>
-    _LIBCPP_INLINE_VISIBILITY
-    typename _VSTD::enable_if<_VSTD::__is_transparent<_Compare, _K2>::value,iterator>::type
-    find(const _K2& __k)                           {return __tree_.find(__k);}
-    template <typename _K2>
-    _LIBCPP_INLINE_VISIBILITY
-    typename _VSTD::enable_if<_VSTD::__is_transparent<_Compare, _K2>::value,const_iterator>::type
-    find(const _K2& __k) const                     {return __tree_.find(__k);}
-#endif
-
    _LIBCPP_INLINE_VISIBILITY
    size_type      count(const key_type& __k) const
        {return __tree_.__count_multi(__k);}
-
    _LIBCPP_INLINE_VISIBILITY
    iterator lower_bound(const key_type& __k)
        {return __tree_.lower_bound(__k);}
    _LIBCPP_INLINE_VISIBILITY
    const_iterator lower_bound(const key_type& __k) const
            {return __tree_.lower_bound(__k);}
-#if _LIBCPP_STD_VER > 11
-    template <typename _K2>
-    _LIBCPP_INLINE_VISIBILITY
-    typename _VSTD::enable_if<_VSTD::__is_transparent<_Compare, _K2>::value,iterator>::type
-    lower_bound(const _K2& __k)       {return __tree_.lower_bound(__k);}
-
-    template <typename _K2>
-    _LIBCPP_INLINE_VISIBILITY
-    typename _VSTD::enable_if<_VSTD::__is_transparent<_Compare, _K2>::value,const_iterator>::type
-    lower_bound(const _K2& __k) const {return __tree_.lower_bound(__k);}
-#endif
-
    _LIBCPP_INLINE_VISIBILITY
    iterator upper_bound(const key_type& __k)
            {return __tree_.upper_bound(__k);}
    _LIBCPP_INLINE_VISIBILITY
    const_iterator upper_bound(const key_type& __k) const
            {return __tree_.upper_bound(__k);}
-#if _LIBCPP_STD_VER > 11
-    template <typename _K2>
-    _LIBCPP_INLINE_VISIBILITY
-    typename _VSTD::enable_if<_VSTD::__is_transparent<_Compare, _K2>::value,iterator>::type
-    upper_bound(const _K2& __k)       {return __tree_.upper_bound(__k);}
-    template <typename _K2>
-    _LIBCPP_INLINE_VISIBILITY
-    typename _VSTD::enable_if<_VSTD::__is_transparent<_Compare, _K2>::value,const_iterator>::type
-    upper_bound(const _K2& __k) const {return __tree_.upper_bound(__k);}
-#endif
-
    _LIBCPP_INLINE_VISIBILITY
    pair<iterator,iterator>             equal_range(const key_type& __k)
            {return __tree_.__equal_range_multi(__k);}
    _LIBCPP_INLINE_VISIBILITY
    pair<const_iterator,const_iterator> equal_range(const key_type& __k) const
            {return __tree_.__equal_range_multi(__k);}
-#if _LIBCPP_STD_VER > 11
-    template <typename _K2>
-    _LIBCPP_INLINE_VISIBILITY
-    typename _VSTD::enable_if<_VSTD::__is_transparent<_Compare, _K2>::value,pair<iterator,iterator>>::type
-    equal_range(const _K2& __k)       {return __tree_.__equal_range_multi(__k);}
-    template <typename _K2>
-    _LIBCPP_INLINE_VISIBILITY
-    typename _VSTD::enable_if<_VSTD::__is_transparent<_Compare, _K2>::value,pair<const_iterator,const_iterator>>::type
-    equal_range(const _K2& __k) const {return __tree_.__equal_range_multi(__k);}
-#endif
 };

 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
--- a/include/shared_mutex
+++ b/include/shared_mutex
@@ -1,419 +0,0 @@
-// -*- C++ -*-
-//===------------------------ shared_mutex --------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef _LIBCPP_SHARED_MUTEX
-#define _LIBCPP_SHARED_MUTEX
-
-/*
-    shared_mutex synopsis
-
-// C++1y
-
-namespace std
-{
-
-class shared_mutex
-{
-public:
-    shared_mutex();
-    ~shared_mutex();
-
-    shared_mutex(const shared_mutex&) = delete;
-    shared_mutex& operator=(const shared_mutex&) = delete;
-
-    // Exclusive ownership
-    void lock(); // blocking
-    bool try_lock();
-    template <class Rep, class Period>
-        bool try_lock_for(const chrono::duration<Rep, Period>& rel_time);
-    template <class Clock, class Duration>
-        bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
-    void unlock();
-
-    // Shared ownership
-    void lock_shared(); // blocking
-    bool try_lock_shared();
-    template <class Rep, class Period>
-        bool
-        try_lock_shared_for(const chrono::duration<Rep, Period>& rel_time);
-    template <class Clock, class Duration>
-        bool
-        try_lock_shared_until(const chrono::time_point<Clock, Duration>& abs_time);
-    void unlock_shared();
-};
-
-template <class Mutex>
-class shared_lock
-{
-public:
-    typedef Mutex mutex_type;
-
-    // Shared locking
-    shared_lock() noexcept;
-    explicit shared_lock(mutex_type& m); // blocking
-    shared_lock(mutex_type& m, defer_lock_t) noexcept;
-    shared_lock(mutex_type& m, try_to_lock_t);
-    shared_lock(mutex_type& m, adopt_lock_t);
-    template <class Clock, class Duration>
-        shared_lock(mutex_type& m,
-                    const chrono::time_point<Clock, Duration>& abs_time);
-    template <class Rep, class Period>
-        shared_lock(mutex_type& m,
-                    const chrono::duration<Rep, Period>& rel_time);
-    ~shared_lock();
-
-    shared_lock(shared_lock const&) = delete;
-    shared_lock& operator=(shared_lock const&) = delete;
-
-    shared_lock(shared_lock&& u) noexcept;
-    shared_lock& operator=(shared_lock&& u) noexcept;
-
-    void lock(); // blocking
-    bool try_lock();
-    template <class Rep, class Period>
-        bool try_lock_for(const chrono::duration<Rep, Period>& rel_time);
-    template <class Clock, class Duration>
-        bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
-    void unlock();
-
-    // Setters
-    void swap(shared_lock& u) noexcept;
-    mutex_type* release() noexcept;
-
-    // Getters
-    bool owns_lock() const noexcept;
-    explicit operator bool () const noexcept;
-    mutex_type* mutex() const noexcept;
-};
-
-template <class Mutex>
-    void swap(shared_lock<Mutex>& x, shared_lock<Mutex>& y) noexcept;
-
-}  // std
-
-*/
-
-#include <__config>
-
-#if _LIBCPP_STD_VER > 11 || defined(_LIBCPP_BUILDING_SHARED_MUTEX)
-
-#include <__mutex_base>
-
-#include <__undef_min_max>
-
-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-#pragma GCC system_header
-#endif
-
-_LIBCPP_BEGIN_NAMESPACE_STD
-
-class _LIBCPP_TYPE_VIS shared_mutex
-{
-    mutex               __mut_;
-    condition_variable  __gate1_;
-    condition_variable  __gate2_;
-    unsigned            __state_;
-
-    static const unsigned __write_entered_ = 1U << (sizeof(unsigned)*__CHAR_BIT__ - 1);
-    static const unsigned __n_readers_ = ~__write_entered_;
-public:
-    shared_mutex();
-    _LIBCPP_INLINE_VISIBILITY ~shared_mutex() = default;
-
-    shared_mutex(const shared_mutex&) = delete;
-    shared_mutex& operator=(const shared_mutex&) = delete;
-
-    // Exclusive ownership
-    void lock();
-    bool try_lock();
-    template <class _Rep, class _Period>
-        _LIBCPP_INLINE_VISIBILITY
-        bool
-        try_lock_for(const chrono::duration<_Rep, _Period>& __rel_time)
-        {
-            return try_lock_until(chrono::steady_clock::now() + __rel_time);
-        }
-    template <class _Clock, class _Duration>
-        bool
-        try_lock_until(const chrono::time_point<_Clock, _Duration>& __abs_time);
-    void unlock();
-
-    // Shared ownership
-    void lock_shared();
-    bool try_lock_shared();
-    template <class _Rep, class _Period>
-        _LIBCPP_INLINE_VISIBILITY
-        bool
-        try_lock_shared_for(const chrono::duration<_Rep, _Period>& __rel_time)
-        {
-            return try_lock_shared_until(chrono::steady_clock::now() + __rel_time);
-        }
-    template <class _Clock, class _Duration>
-        bool
-        try_lock_shared_until(const chrono::time_point<_Clock, _Duration>& __abs_time);
-    void unlock_shared();
-};
-
-template <class _Clock, class _Duration>
-bool
-shared_mutex::try_lock_until(
-                        const chrono::time_point<_Clock, _Duration>& __abs_time)
-{
-    unique_lock<mutex> __lk(__mut_);
-    if (__state_ & __write_entered_)
-    {
-        while (true)
-        {
-            cv_status __status = __gate1_.wait_until(__lk, __abs_time);
-            if ((__state_ & __write_entered_) == 0)
-                break;
-            if (__status == cv_status::timeout)
-                return false;
-        }
-    }
-    __state_ |= __write_entered_;
-    if (__state_ & __n_readers_)
-    {
-        while (true)
-        {
-            cv_status __status = __gate2_.wait_until(__lk, __abs_time);
-            if ((__state_ & __n_readers_) == 0)
-                break;
-            if (__status == cv_status::timeout)
-            {
-                __state_ &= ~__write_entered_;
-                return false;
-            }
-        }
-    }
-    return true;
-}
-
-template <class _Clock, class _Duration>
-bool
-shared_mutex::try_lock_shared_until(
-                        const chrono::time_point<_Clock, _Duration>& __abs_time)
-{
-    unique_lock<mutex> __lk(__mut_);
-    if ((__state_ & __write_entered_) || (__state_ & __n_readers_) == __n_readers_)
-    {
-        while (true)
-        {
-            cv_status status = __gate1_.wait_until(__lk, __abs_time);
-            if ((__state_ & __write_entered_) == 0 &&
-                                       (__state_ & __n_readers_) < __n_readers_)
-                break;
-            if (status == cv_status::timeout)
-                return false;
-        }
-    }
-    unsigned __num_readers = (__state_ & __n_readers_) + 1;
-    __state_ &= ~__n_readers_;
-    __state_ |= __num_readers;
-    return true;
-}
-
-template <class _Mutex>
-class shared_lock
-{
-public:
-    typedef _Mutex mutex_type;
-
-private:
-    mutex_type* __m_;
-    bool __owns_;
-
-public:
-    _LIBCPP_INLINE_VISIBILITY
-    shared_lock() noexcept
-        : __m_(nullptr),
-          __owns_(false)
-        {}
-
-    _LIBCPP_INLINE_VISIBILITY
-    explicit shared_lock(mutex_type& __m)
-        : __m_(&__m),
-          __owns_(true)
-        {__m_->lock_shared();}
-
-    _LIBCPP_INLINE_VISIBILITY
-    shared_lock(mutex_type& __m, defer_lock_t) noexcept
-        : __m_(&__m),
-          __owns_(false)
-        {}
-
-    _LIBCPP_INLINE_VISIBILITY
-    shared_lock(mutex_type& __m, try_to_lock_t)
-        : __m_(&__m),
-          __owns_(__m.try_lock_shared())
-        {}
-
-    _LIBCPP_INLINE_VISIBILITY
-    shared_lock(mutex_type& __m, adopt_lock_t)
-        : __m_(&__m),
-          __owns_(true)
-        {}
-
-    template <class _Clock, class _Duration>
-        _LIBCPP_INLINE_VISIBILITY
-        shared_lock(mutex_type& __m,
-                    const chrono::time_point<_Clock, _Duration>& __abs_time)
-            : __m_(&__m),
-              __owns_(__m.try_lock_shared_until(__abs_time))
-            {}
-
-    template <class _Rep, class _Period>
-        _LIBCPP_INLINE_VISIBILITY
-        shared_lock(mutex_type& __m,
-                    const chrono::duration<_Rep, _Period>& __rel_time)
-            : __m_(&__m),
-              __owns_(__m.try_lock_shared_for(__rel_time))
-            {}
-
-    _LIBCPP_INLINE_VISIBILITY
-    ~shared_lock()
-    {
-        if (__owns_)
-            __m_->unlock_shared();
-    }
-
-    shared_lock(shared_lock const&) = delete;
-    shared_lock& operator=(shared_lock const&) = delete;
-
-    _LIBCPP_INLINE_VISIBILITY
-    shared_lock(shared_lock&& __u) noexcept
-        : __m_(__u.__m_),
-          __owns_(__u.__owns_)
-        {
-            __u.__m_ = nullptr;
-            __u.__owns_ = false;
-        }
-
-    _LIBCPP_INLINE_VISIBILITY
-    shared_lock& operator=(shared_lock&& __u) noexcept
-    {
-        if (__owns_)
-            __m_->unlock_shared();
-        __m_ = nullptr;
-        __owns_ = false;
-        __m_ = __u.__m_;
-        __owns_ = __u.__owns_;
-        __u.__m_ = nullptr;
-        __u.__owns_ = false;
-        return *this;
-    }
-
-    void lock();
-    bool try_lock();
-    template <class Rep, class Period>
-        bool try_lock_for(const chrono::duration<Rep, Period>& rel_time);
-    template <class Clock, class Duration>
-        bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
-    void unlock();
-
-    // Setters
-    _LIBCPP_INLINE_VISIBILITY
-    void swap(shared_lock& __u) noexcept
-    {
-        _VSTD::swap(__m_, __u.__m_);
-        _VSTD::swap(__owns_, __u.__owns_);
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    mutex_type* release() noexcept
-    {
-        mutex_type* __m = __m_;
-        __m_ = nullptr;
-        __owns_ = false;
-        return __m;
-    }
-
-    // Getters
-    _LIBCPP_INLINE_VISIBILITY
-    bool owns_lock() const noexcept {return __owns_;}
-
-    _LIBCPP_INLINE_VISIBILITY
-    explicit operator bool () const noexcept {return __owns_;}
-
-    _LIBCPP_INLINE_VISIBILITY
-    mutex_type* mutex() const noexcept {return __m_;}
-};
-
-template <class _Mutex>
-void
-shared_lock<_Mutex>::lock()
-{
-    if (__m_ == nullptr)
-        __throw_system_error(EPERM, "shared_lock::lock: references null mutex");
-    if (__owns_)
-        __throw_system_error(EDEADLK, "shared_lock::lock: already locked");
-    __m_->lock_shared();
-    __owns_ = true;
-}
-
-template <class _Mutex>
-bool
-shared_lock<_Mutex>::try_lock()
-{
-    if (__m_ == nullptr)
-        __throw_system_error(EPERM, "shared_lock::try_lock: references null mutex");
-    if (__owns_)
-        __throw_system_error(EDEADLK, "shared_lock::try_lock: already locked");
-    __owns_ = __m_->try_lock_shared();
-    return __owns_;
-}
-
-template <class _Mutex>
-template <class _Rep, class _Period>
-bool
-shared_lock<_Mutex>::try_lock_for(const chrono::duration<_Rep, _Period>& __d)
-{
-    if (__m_ == nullptr)
-        __throw_system_error(EPERM, "shared_lock::try_lock_for: references null mutex");
-    if (__owns_)
-        __throw_system_error(EDEADLK, "shared_lock::try_lock_for: already locked");
-    __owns_ = __m_->try_lock_shared_for(__d);
-    return __owns_;
-}
-
-template <class _Mutex>
-template <class _Clock, class _Duration>
-bool
-shared_lock<_Mutex>::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t)
-{
-    if (__m_ == nullptr)
-        __throw_system_error(EPERM, "shared_lock::try_lock_until: references null mutex");
-    if (__owns_)
-        __throw_system_error(EDEADLK, "shared_lock::try_lock_until: already locked");
-    __owns_ = __m_->try_lock_shared_until(__t);
-    return __owns_;
-}
-
-template <class _Mutex>
-void
-shared_lock<_Mutex>::unlock()
-{
-    if (!__owns_)
-        __throw_system_error(EPERM, "shared_lock::unlock: not locked");
-    __m_->unlock_shared();
-    __owns_ = false;
-}
-
-template <class _Mutex>
-inline _LIBCPP_INLINE_VISIBILITY
-void
-swap(shared_lock<_Mutex>& __x, shared_lock<_Mutex>& __y) noexcept
-    {__x.swap(__y);}
-
-_LIBCPP_END_NAMESPACE_STD
-
-#endif  // _LIBCPP_STD_VER > 11
-
-#endif  // _LIBCPP_SHARED_MUTEX
--- a/include/sstream
+++ b/include/sstream
@@ -186,7 +186,7 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 // basic_stringbuf

 template <class _CharT, class _Traits, class _Allocator>
-class _LIBCPP_TYPE_VIS_ONLY basic_stringbuf
+class _LIBCPP_TYPE_VIS basic_stringbuf
    : public basic_streambuf<_CharT, _Traits>
 {
 public:
@@ -613,7 +613,7 @@ basic_stringbuf<_CharT, _Traits, _Allocator>::seekpos(pos_type __sp,
 // basic_istringstream

 template <class _CharT, class _Traits, class _Allocator>
-class _LIBCPP_TYPE_VIS_ONLY basic_istringstream
+class _LIBCPP_TYPE_VIS basic_istringstream
    : public basic_istream<_CharT, _Traits>
 {
 public:
@@ -732,7 +732,7 @@ basic_istringstream<_CharT, _Traits, _Allocator>::str(const string_type& __s)
 // basic_ostringstream

 template <class _CharT, class _Traits, class _Allocator>
-class _LIBCPP_TYPE_VIS_ONLY basic_ostringstream
+class _LIBCPP_TYPE_VIS basic_ostringstream
    : public basic_ostream<_CharT, _Traits>
 {
 public:
@@ -851,7 +851,7 @@ basic_ostringstream<_CharT, _Traits, _Allocator>::str(const string_type& __s)
 // basic_stringstream

 template <class _CharT, class _Traits, class _Allocator>
-class _LIBCPP_TYPE_VIS_ONLY basic_stringstream
+class _LIBCPP_TYPE_VIS basic_stringstream
    : public basic_iostream<_CharT, _Traits>
 {
 public:
--- a/include/stack
+++ b/include/stack
@@ -91,7 +91,7 @@ template <class T, class Container>

 _LIBCPP_BEGIN_NAMESPACE_STD

-template <class _Tp, class _Container> class _LIBCPP_TYPE_VIS_ONLY stack;
+template <class _Tp, class _Container> class _LIBCPP_TYPE_VIS stack;

 template <class _Tp, class _Container>
 _LIBCPP_INLINE_VISIBILITY
@@ -104,7 +104,7 @@ bool
 operator< (const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y);

 template <class _Tp, class _Container = deque<_Tp> >
-class _LIBCPP_TYPE_VIS_ONLY stack
+class _LIBCPP_TYPE_VIS stack
 {
 public:
    typedef _Container                               container_type;
@@ -282,7 +282,7 @@ swap(stack<_Tp, _Container>& __x, stack<_Tp, _Container>& __y)
 }

 template <class _Tp, class _Container, class _Alloc>
-struct _LIBCPP_TYPE_VIS_ONLY uses_allocator<stack<_Tp, _Container>, _Alloc>
+struct _LIBCPP_TYPE_VIS uses_allocator<stack<_Tp, _Container>, _Alloc>
    : public uses_allocator<_Container, _Alloc>
 {
 };
--- a/include/streambuf
+++ b/include/streambuf
@@ -119,7 +119,7 @@ protected:
 _LIBCPP_BEGIN_NAMESPACE_STD

 template <class _CharT, class _Traits>
-class _LIBCPP_TYPE_VIS_ONLY basic_streambuf
+class _LIBCPP_TYPE_VIS basic_streambuf
 {
 public:
    // types:
@@ -553,11 +553,11 @@ basic_streambuf<_CharT, _Traits>::overflow(int_type)
    return traits_type::eof();
 }

-_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_TYPE_VIS basic_streambuf<char>)
-_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_TYPE_VIS basic_streambuf<wchar_t>)
+_LIBCPP_EXTERN_TEMPLATE(class basic_streambuf<char>)
+_LIBCPP_EXTERN_TEMPLATE(class basic_streambuf<wchar_t>)

-_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_TYPE_VIS basic_ios<char>)
-_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_TYPE_VIS basic_ios<wchar_t>)
+_LIBCPP_EXTERN_TEMPLATE(class basic_ios<char>)
+_LIBCPP_EXTERN_TEMPLATE(class basic_ios<wchar_t>)

 _LIBCPP_END_NAMESPACE_STD

--- a/include/string
+++ b/include/string
--- a/include/support/ibm/limits.h
+++ b/include/support/ibm/limits.h
@@ -1,99 +0,0 @@
-// -*- C++ -*-
-//===--------------------- support/ibm/limits.h ---------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef _LIBCPP_SUPPORT_IBM_LIMITS_H
-#define _LIBCPP_SUPPORT_IBM_LIMITS_H
-
-#if !defined(_AIX) // Linux
-#include <math.h> // for HUGE_VAL, HUGE_VALF, HUGE_VALL, and NAN
-
-static const unsigned int _QNAN_F = 0x7fc00000;
-#define NANF (*((float *)(&_QNAN_F)))
-static const unsigned int _QNAN_LDBL128[4] = {0x7ff80000, 0x0, 0x0, 0x0};
-#define NANL (*((long double *)(&_QNAN_LDBL128)))
-static const unsigned int _SNAN_F= 0x7f855555;
-#define NANSF (*((float *)(&_SNAN_F)))
-static const unsigned int _SNAN_D[2] = {0x7ff55555, 0x55555555};
-#define NANS (*((double *)(&_SNAN_D)))
-static const unsigned int _SNAN_LDBL128[4] = {0x7ff55555, 0x55555555, 0x0, 0x0};
-#define NANSL (*((long double *)(&_SNAN_LDBL128)))
-
-#define __builtin_huge_val()     HUGE_VAL
-#define __builtin_huge_valf()    HUGE_VALF
-#define __builtin_huge_vall()    HUGE_VALL
-#define __builtin_nan(__dummy)   NAN
-#define __builtin_nanf(__dummy)  NANF
-#define __builtin_nanl(__dummy)  NANL
-#define __builtin_nans(__dummy)  NANS
-#define __builtin_nansf(__dummy) NANSF
-#define __builtin_nansl(__dummy) NANSL
-
-#else
-
-#include <math.h>
-#include <float.h> // limit constants
-
-#define __builtin_huge_val()     HUGE_VAL  //0x7ff0000000000000
-#define __builtin_huge_valf()    HUGE_VALF //0x7f800000
-#define __builtin_huge_vall()    HUGE_VALL //0x7ff0000000000000
-#define __builtin_nan(__dummy)   nan(__dummy) //0x7ff8000000000000
-#define __builtin_nanf(__dummy)  nanf(__dummy) // 0x7ff80000
-#define __builtin_nanl(__dummy)  nanl(__dummy) //0x7ff8000000000000
-#define __builtin_nans(__dummy)  DBL_SNAN //0x7ff5555555555555
-#define __builtin_nansf(__dummy) FLT_SNAN //0x7f855555
-#define __builtin_nansl(__dummy) DBL_SNAN //0x7ff5555555555555
-
-#define __FLT_MANT_DIG__   FLT_MANT_DIG
-#define __FLT_DIG__        FLT_DIG
-#define __FLT_RADIX__      FLT_RADIX
-#define __FLT_MIN_EXP__    FLT_MIN_EXP
-#define __FLT_MIN_10_EXP__ FLT_MIN_10_EXP
-#define __FLT_MAX_EXP__    FLT_MAX_EXP
-#define __FLT_MAX_10_EXP__ FLT_MAX_10_EXP
-#define __FLT_MIN__        FLT_MIN
-#define __FLT_MAX__        FLT_MAX
-#define __FLT_EPSILON__    FLT_EPSILON
-// predefined by XLC on LoP
-#define __FLT_DENORM_MIN__ 1.40129846e-45F
-
-#define __DBL_MANT_DIG__   DBL_MANT_DIG
-#define __DBL_DIG__        DBL_DIG
-#define __DBL_MIN_EXP__    DBL_MIN_EXP
-#define __DBL_MIN_10_EXP__ DBL_MIN_10_EXP
-#define __DBL_MAX_EXP__    DBL_MAX_EXP
-#define __DBL_MAX_10_EXP__ DBL_MAX_10_EXP
-#define __DBL_MIN__        DBL_MIN
-#define __DBL_MAX__        DBL_MAX
-#define __DBL_EPSILON__    DBL_EPSILON
-// predefined by XLC on LoP
-#define __DBL_DENORM_MIN__ 4.9406564584124654e-324
-
-#define __LDBL_MANT_DIG__   LDBL_MANT_DIG
-#define __LDBL_DIG__        LDBL_DIG
-#define __LDBL_MIN_EXP__    LDBL_MIN_EXP
-#define __LDBL_MIN_10_EXP__ LDBL_MIN_10_EXP
-#define __LDBL_MAX_EXP__    LDBL_MAX_EXP
-#define __LDBL_MAX_10_EXP__ LDBL_MAX_10_EXP
-#define __LDBL_MIN__        LDBL_MIN
-#define __LDBL_MAX__        LDBL_MAX
-#define __LDBL_EPSILON__    LDBL_EPSILON
-// predefined by XLC on LoP
-#if __LONGDOUBLE128
-#define __LDBL_DENORM_MIN__ 4.94065645841246544176568792868221e-324L
-#else
-#define __LDBL_DENORM_MIN__ 4.9406564584124654e-324L
-#endif
-
-// predefined by XLC on LoP
-#define __CHAR_BIT__    8
-
-#endif // _AIX
-
-#endif // _LIBCPP_SUPPORT_IBM_LIMITS_H
--- a/include/support/ibm/support.h
+++ b/include/support/ibm/support.h
@@ -1,54 +0,0 @@
-// -*- C++ -*-
-//===----------------------- support/ibm/support.h ----------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef _LIBCPP_SUPPORT_IBM_SUPPORT_H
-#define _LIBCPP_SUPPORT_IBM_SUPPORT_H
-
-extern "builtin" int __popcnt4(unsigned int);
-extern "builtin" int __popcnt8(unsigned long long);
-extern "builtin" unsigned int __cnttz4(unsigned int);
-extern "builtin" unsigned int __cnttz8(unsigned long long);
-extern "builtin" unsigned int __cntlz4(unsigned long long);
-extern "builtin" unsigned int __cntlz8(unsigned long long);
-
-// Builtin functions for counting population
-#define __builtin_popcount(x) __popcnt4(x)
-#define __builtin_popcountll(x) __popcnt8(x)
-#if defined(__64BIT__)
-#define __builtin_popcountl(x) __builtin_popcountll(x)
-#else
-#define __builtin_popcountl(x) __builtin_popcount(x)
-#endif
-
-// Builtin functions for counting trailing zeros
-#define __builtin_ctz(x) __cnttz4(x)
-#define __builtin_ctzll(x) __cnttz8(x)
-#if defined(__64BIT__)
-#define __builtin_ctzl(x) __builtin_ctzll(x)
-#else
-#define __builtin_ctzl(x) __builtin_ctz(x)
-#endif
-
-// Builtin functions for counting leading zeros
-#define __builtin_clz(x) __cntlz4(x)
-#define __builtin_clzll(x) __cntlz8(x)
-#if defined(__64BIT__)
-#define __builtin_clzl(x) __builtin_clzll(x)
-#else
-#define __builtin_clzl(x) __builtin_clz(x)
-#endif
-
-#if defined(__64BIT__)
-#define __SIZE_WIDTH__ 64
-#else
-#define __SIZE_WIDTH__ 32
-#endif
-
-#endif // _LIBCPP_SUPPORT_IBM_SUPPORT_H
--- a/include/support/ibm/xlocale.h
+++ b/include/support/ibm/xlocale.h
@@ -1,326 +0,0 @@
-// -*- C++ -*-
-//===--------------------- support/ibm/xlocale.h -------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef _LIBCPP_SUPPORT_IBM_XLOCALE_H
-#define _LIBCPP_SUPPORT_IBM_XLOCALE_H
-
-#if defined(_AIX)
-#include "cstdlib"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#if !defined(_AIX71)
-// AIX 7.1 and higher has these definitions.  Definitions and stubs
-// are provied here as a temporary workaround on AIX 6.1.
-
-#define LC_COLLATE_MASK         1
-#define LC_CTYPE_MASK           2
-#define LC_MESSAGES_MASK        4
-#define LC_MONETARY_MASK        8
-#define LC_NUMERIC_MASK         16
-#define LC_TIME_MASK            32
-#define LC_ALL_MASK             (LC_COLLATE_MASK | LC_CTYPE_MASK | \
-                                 LC_MESSAGES_MASK | LC_MONETARY_MASK |\
-                                 LC_NUMERIC_MASK | LC_TIME_MASK)
-
-typedef void* locale_t;
-
-// The following are stubs.  They are not supported on AIX 6.1.
-static inline
-locale_t newlocale(int category_mask, const char *locale, locale_t base)
-{
-  _LC_locale_t *newloc, *loc;
-  if ((loc = (_LC_locale_t *)__xopen_locale(locale)) == NULL)
-  {
-    errno = EINVAL;
-    return (locale_t)0;
-  }
-  if ((newloc = (_LC_locale_t *)calloc(1, sizeof(_LC_locale_t))) == NULL)
-  {
-    errno = ENOMEM;
-    return (locale_t)0;
-  }
-  if (!base)
-    base = (_LC_locale_t *)__xopen_locale("C");
-  memcpy(newloc, base, sizeof (_LC_locale_t));
-  if (category_mask & LC_COLLATE_MASK) 
-    newloc->lc_collate = loc->lc_collate;
-  if (category_mask & LC_CTYPE_MASK)
-    newloc->lc_ctype = loc->lc_ctype;
-  //if (category_mask & LC_MESSAGES_MASK)
-  //  newloc->lc_messages = loc->lc_messages;
-  if (category_mask & LC_MONETARY_MASK)
-    newloc->lc_monetary = loc->lc_monetary;
-  if (category_mask & LC_TIME_MASK)
-    newloc->lc_time = loc->lc_time;
-  if (category_mask & LC_NUMERIC_MASK)
-    newloc->lc_numeric = loc->lc_numeric;
-  return (locale_t)newloc; 
-}
-static inline
-void freelocale(locale_t locobj)
-{
-  free(locobj);
-}
-static inline
-locale_t uselocale(locale_t newloc)
-{
-  return (locale_t)0;
-}
-
-static inline
-int isalnum_l(int c, locale_t locale)
-{
-  return __xisalnum(locale, c);
-}
-static inline
-int isalpha_l(int c, locale_t locale)
-{
-  return __xisalpha(locale, c);
-}
-static inline
-int isblank_l(int c, locale_t locale)
-{
-  return __xisblank(locale, c);
-}
-static inline
-int iscntrl_l(int c, locale_t locale)
-{
-  return __xiscntrl(locale, c);
-}
-static inline
-int isdigit_l(int c, locale_t locale)
-{
-  return __xisdigit(locale, c);
-}
-static inline
-int isgraph_l(int c, locale_t locale)
-{
-  return __xisgraph(locale, c);
-}
-static inline
-int islower_l(int c, locale_t locale)
-{
-  return __xislower(locale, c);
-}
-static inline
-int isprint_l(int c, locale_t locale)
-{
-  return __xisprint(locale, c);
-}
-
-static inline
-int ispunct_l(int c, locale_t locale)
-{
-  return __xispunct(locale, c);
-}
-static inline
-int isspace_l(int c, locale_t locale)
-{
-  return __xisspace(locale, c);
-}
-static inline
-int isupper_l(int c, locale_t locale)
-{
-  return __xisupper(locale, c);
-}
-
-static inline
-int isxdigit_l(int c, locale_t locale)
-{
-  return __xisxdigit(locale, c);
-}
-
-static inline
-int iswalnum_l(wchar_t wc, locale_t locale)
-{
-  return __xiswalnum(locale, wc); 
-}
-
-static inline
-int iswalpha_l(wchar_t wc, locale_t locale)
-{
-  return __xiswalpha(locale, wc);
-}
-
-static inline
-int iswblank_l(wchar_t wc, locale_t locale)
-{
-  return __xiswblank(locale, wc);
-}
-
-static inline
-int iswcntrl_l(wchar_t wc, locale_t locale)
-{
-  return __xiswcntrl(locale, wc);
-}
-
-static inline
-int iswdigit_l(wchar_t wc, locale_t locale)
-{
-  return __xiswdigit(locale, wc);
-}
-
-static inline
-int iswgraph_l(wchar_t wc, locale_t locale)
-{
-  return __xiswgraph(locale, wc);
-}
-
-static inline
-int iswlower_l(wchar_t wc, locale_t locale)
-{
-  return __xiswlower(locale, wc);
-}
-
-static inline
-int iswprint_l(wchar_t wc, locale_t locale)
-{
-  return __xiswprint(locale, wc);
-}
-
-static inline
-int iswpunct_l(wchar_t wc, locale_t locale)
-{
-  return __xiswpunct(locale, wc);
-}
-
-static inline
-int iswspace_l(wchar_t wc, locale_t locale)
-{
-  return __xiswspace(locale, wc);
-}
-
-static inline
-int iswupper_l(wchar_t wc, locale_t locale)
-{
-  return __xiswupper(locale, wc);
-}
-
-static inline
-int iswxdigit_l(wchar_t wc, locale_t locale)
-{
-  return __xiswxdigit(locale, wc);
-}
-
-static inline
-int iswctype_l(wint_t wc, wctype_t desc, locale_t locale)
-{
-  return __xiswctype(locale, wc, desc); 
-}
-
-static inline
-int toupper_l(int c, locale_t locale)
-{
-  return __xtoupper(locale, c);
-}
-static inline
-int tolower_l(int c, locale_t locale)
-{
-  return __xtolower(locale, c);
-}
-static inline
-wint_t towupper_l(wint_t wc, locale_t locale)
-{
-  return __xtowupper(locale, wc);
-}
-static inline
-wint_t towlower_l(wint_t wc, locale_t locale)
-{
-  return __xtowlower(locale, wc);
-}
-
-static inline
-int strcoll_l(const char *__s1, const char *__s2, locale_t locale)
-{
-  return __xstrcoll(locale, __s1, __s2);
-}
-static inline
-int wcscoll_l(const wchar_t *__s1, const wchar_t *__s2, locale_t locale)
-{
-  return __xwcscoll(locale, __s1, __s2);
-}
-static inline
-size_t strxfrm_l(char *__s1, const char *__s2, size_t __n, locale_t locale)
-{
-  return __xstrxfrm(locale, __s1, __s2, __n);
-}
-
-static inline
-size_t wcsxfrm_l(wchar_t *__ws1, const wchar_t *__ws2, size_t __n,
-    locale_t locale)
-{
-  return __xwcsxfrm(locale, __ws1, __ws2, __n);
-}
-#endif // !defined(_AIX71)
-
-// strftime_l() is defined by POSIX. However, AIX 7.1 does not have it
-// implemented yet.
-static inline
-size_t strftime_l(char *__s, size_t __size, const char *__fmt,
-                  const struct tm *__tm, locale_t locale) {
-  return __xstrftime(locale, __s, __size, __fmt, __tm);
-}
-
-// The following are not POSIX routines.  These are quick-and-dirty hacks
-// to make things pretend to work
-static inline
-long long strtoll_l(const char *__nptr, char **__endptr,
-    int __base, locale_t locale) {
-  return strtoll(__nptr, __endptr, __base);
-}
-static inline
-long strtol_l(const char *__nptr, char **__endptr,
-    int __base, locale_t locale) {
-  return strtol(__nptr, __endptr, __base);
-}
-static inline
-long double strtold_l(const char *__nptr, char **__endptr,
-    locale_t locale) {
-  return strtold(__nptr, __endptr);
-}
-static inline
-unsigned long long strtoull_l(const char *__nptr, char **__endptr,
-    int __base, locale_t locale) {
-  return strtoull(__nptr, __endptr, __base);
-}
-static inline
-unsigned long strtoul_l(const char *__nptr, char **__endptr,
-    int __base, locale_t locale) {
-  return strtoul(__nptr, __endptr, __base);
-}
-
-static inline
-int vasprintf(char **strp, const char *fmt, va_list ap)
-{
-  const size_t buff_size = 256;
-  int str_size;
-  if ((*strp = (char *)malloc(buff_size)) == NULL)
-  {
-    return -1;
-  }
-  if ((str_size = vsnprintf(*strp, buff_size, fmt,  ap)) >= buff_size)
-  {
-    if ((*strp = (char *)realloc(*strp, str_size + 1)) == NULL)
-    {
-      return -1;
-    }
-    str_size = vsnprintf(*strp, str_size + 1, fmt,  ap);
-  }
-  return str_size;
-}  
-
-#ifdef __cplusplus
-}
-#endif
-#endif // defined(_AIX)
-#endif // _LIBCPP_SUPPORT_IBM_XLOCALE_H
--- a/include/support/win32/limits_win32.h
+++ b/include/support/win32/limits_win32.h
@@ -11,15 +11,16 @@
 #ifndef _LIBCPP_SUPPORT_WIN32_LIMITS_WIN32_H
 #define _LIBCPP_SUPPORT_WIN32_LIMITS_WIN32_H

-#if !defined(_LIBCPP_MSVCRT)
-#error "This header complements the Microsoft C Runtime library, and should not be included otherwise."
+#if !defined(_MSC_VER)
+#error "This header is MSVC specific, Clang and GCC should not include it"
 #else

-#include <limits.h> // CHAR_BIT
-#include <float.h> // limit constants
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif
+#include <windows.h> // ymath.h works correctly

-#if ! defined(__clang__)
-#define __CHAR_BIT__       CHAR_BIT
+#include <float.h> // limit constants

 #define __FLT_MANT_DIG__   FLT_MANT_DIG
 #define __FLT_DIG__        FLT_DIG
@@ -72,8 +73,7 @@
 #define __builtin_nans(__dummy)  _Snan._Double
 #define __builtin_nansf(__dummy) _FSnan._Float
 #define __builtin_nansl(__dummy) _LSnan._Long_double
-#endif // ! defined(__clang__)

-#endif // _LIBCPP_MSVCRT
+#endif // _MSC_VER

 #endif // _LIBCPP_SUPPORT_WIN32_LIMITS_WIN32_H
--- a/include/support/win32/locale_win32.h
+++ b/include/support/win32/locale_win32.h
@@ -15,7 +15,6 @@
 extern "C" unsigned short  __declspec(dllimport) _ctype[];

 #include "support/win32/support.h"
-#include <stdio.h>
 #include <memory>
 #include <xlocinfo.h> // _locale_t
 #define locale_t _locale_t
@@ -36,23 +35,23 @@ extern "C" unsigned short  __declspec(dllimport) _ctype[];
 locale_t newlocale( int mask, const char * locale, locale_t base );
 locale_t uselocale( locale_t newloc );
 lconv *localeconv_l( locale_t loc );
-size_t mbrlen_l( const char *__restrict s, size_t n,
-                 mbstate_t *__restrict ps, locale_t loc);
-size_t mbsrtowcs_l( wchar_t *__restrict dst, const char **__restrict src,
-                    size_t len, mbstate_t *__restrict ps, locale_t loc );
-size_t wcrtomb_l( char *__restrict s, wchar_t wc, mbstate_t *__restrict ps,
+size_t mbrlen_l( const char *__restrict__ s, size_t n,
+                 mbstate_t *__restrict__ ps, locale_t loc);
+size_t mbsrtowcs_l( wchar_t *__restrict__ dst, const char **__restrict__ src,
+                    size_t len, mbstate_t *__restrict__ ps, locale_t loc );
+size_t wcrtomb_l( char *__restrict__ s, wchar_t wc, mbstate_t *__restrict__ ps,
                  locale_t loc);
-size_t mbrtowc_l( wchar_t *__restrict pwc, const char *__restrict s,
-                  size_t n, mbstate_t *__restrict ps, locale_t loc);
-size_t mbsnrtowcs_l( wchar_t *__restrict dst, const char **__restrict src,
-                     size_t nms, size_t len, mbstate_t *__restrict ps, locale_t loc);
-size_t wcsnrtombs_l( char *__restrict dst, const wchar_t **__restrict src,
-                     size_t nwc, size_t len, mbstate_t *__restrict ps, locale_t loc);
+size_t mbrtowc_l( wchar_t *__restrict__ pwc, const char *__restrict__ s,
+                  size_t n, mbstate_t *__restrict__ ps, locale_t loc);
+size_t mbsnrtowcs_l( wchar_t *__restrict__ dst, const char **__restrict__ src,
+                     size_t nms, size_t len, mbstate_t *__restrict__ ps, locale_t loc);
+size_t wcsnrtombs_l( char *__restrict__ dst, const wchar_t **__restrict__ src,
+                     size_t nwc, size_t len, mbstate_t *__restrict__ ps, locale_t loc);
 wint_t btowc_l( int c, locale_t loc );
 int wctob_l( wint_t c, locale_t loc );
 typedef _VSTD::remove_pointer<locale_t>::type __locale_struct;
 typedef _VSTD::unique_ptr<__locale_struct, decltype(&uselocale)> __locale_raii;
-inline _LIBCPP_ALWAYS_INLINE
+_LIBCPP_ALWAYS_INLINE inline
 decltype(MB_CUR_MAX) MB_CUR_MAX_L( locale_t __l )
 {
  __locale_raii __current( uselocale(__l), uselocale );
@@ -60,6 +59,7 @@ decltype(MB_CUR_MAX) MB_CUR_MAX_L( locale_t __l )
 }

 // the *_l functions are prefixed on Windows, only available for msvcr80+, VS2005+
+#include <stdio.h>
 #define mbtowc_l _mbtowc_l
 #define strtoll_l _strtoi64_l
 #define strtoull_l _strtoui64_l
@@ -103,9 +103,9 @@ isupper_l(int c, _locale_t loc)
 #define sscanf_l( __s, __l, __f, ...) _sscanf_l( __s, __f, __l, __VA_ARGS__ )
 #define vsscanf_l( __s, __l, __f, ...) _sscanf_l( __s, __f, __l, __VA_ARGS__ )
 #define sprintf_l( __s, __l, __f, ... ) _sprintf_l( __s, __f, __l, __VA_ARGS__ )
+#define snprintf_l( __s, __n, __l, __f, ... ) _snprintf_l( __s, __n, __f, __l, __VA_ARGS__ )
 #define vsprintf_l( __s, __l, __f, ... ) _vsprintf_l( __s, __f, __l, __VA_ARGS__ )
 #define vsnprintf_l( __s, __n, __l, __f, ... ) _vsnprintf_l( __s, __n, __f, __l, __VA_ARGS__ )
-int snprintf_l(char *ret, size_t n, locale_t loc, const char *format, ...);
 int asprintf_l( char **ret, locale_t loc, const char *format, ... );
 int vasprintf_l( char **ret, locale_t loc, const char *format, va_list ap );

@@ -120,10 +120,10 @@ inline int iswblank_l( wint_t c, locale_t /*loc*/ )
    return ( c == L' ' || c == L'\t' );
 }

-#if defined(_LIBCPP_MSVCRT)
+#ifdef _MSC_VER
 inline int isblank( int c, locale_t /*loc*/ )
 { return ( c == ' ' || c == '\t' ); }
 inline int iswblank( wint_t c, locale_t /*loc*/ )
 { return ( c == L' ' || c == L'\t' ); }
-#endif // _LIBCPP_MSVCRT
+#endif // _MSC_VER
 #endif // _LIBCPP_SUPPORT_WIN32_LOCALE_WIN32_H
--- a/include/support/win32/math_win32.h
+++ b/include/support/win32/math_win32.h
@@ -11,14 +11,12 @@
 #ifndef _LIBCPP_SUPPORT_WIN32_MATH_WIN32_H
 #define _LIBCPP_SUPPORT_WIN32_MATH_WIN32_H

-#if !defined(_LIBCPP_MSVCRT)
-#error "This header complements Microsoft's C Runtime library, and should not be included otherwise."
+#if !defined(_MSC_VER)
+#error "This header is MSVC specific, Clang and GCC should not include it"
 #else

 #include <math.h>
-#include <float.h> // _FPCLASS_PN etc.

-// Necessary?
 typedef float float_t;
 typedef double double_t;

@@ -110,6 +108,6 @@ _LIBCPP_ALWAYS_INLINE int fpclassify( double num )
    return _fpclass(num);
 }

-#endif // _LIBCPP_MSVCRT
+#endif // _MSC_VER

 #endif // _LIBCPP_SUPPORT_WIN32_MATH_WIN32_H
--- a/include/support/win32/support.h
+++ b/include/support/win32/support.h
@@ -15,27 +15,26 @@
   Functions and constants used in libc++ that are missing from the Windows C library.
  */

+#include <__config>
 #include <wchar.h>  // mbstate_t
-#include <cstdarg> // va_ macros
+#include <stdio.h> // _snwprintf
 #define swprintf _snwprintf
 #define vswprintf _vsnwprintf
+#define vfscnaf fscanf

-#ifndef NOMINMAX
-#define NOMINMAX
-#endif
-
-extern "C" {
-
-int vasprintf( char **sptr, const char *__restrict fmt, va_list ap );
+int vasprintf( char **sptr, const char *__restrict fmt , va_list ap );
 int asprintf( char **sptr, const char *__restrict fmt, ...);
+//int vfscanf( FILE *__restrict stream, const char *__restrict format,
+//             va_list arg);
+
 size_t mbsnrtowcs( wchar_t *__restrict dst, const char **__restrict src,
                   size_t nmc, size_t len, mbstate_t *__restrict ps );
 size_t wcsnrtombs( char *__restrict dst, const wchar_t **__restrict src,
                   size_t nwc, size_t len, mbstate_t *__restrict ps );
-}

-#if defined(_LIBCPP_MSVCRT)
+#if defined(_MSC_VER)
 #define snprintf _snprintf
+
 #include <xlocinfo.h>
 #define atoll _atoi64
 #define strtoll _strtoi64
@@ -86,11 +85,9 @@ _LIBCPP_ALWAYS_INLINE int __builtin_ctz( unsigned int x )
   _BitScanReverse(&r, x);
   return static_cast<int>(r);
 }
-
 // sizeof(long) == sizeof(int) on Windows
 _LIBCPP_ALWAYS_INLINE int __builtin_ctzl( unsigned long x )
 { return __builtin_ctz( static_cast<int>(x) ); }
-
 _LIBCPP_ALWAYS_INLINE int __builtin_ctzll( unsigned long long x )
 {
    DWORD r = 0;
@@ -113,6 +110,6 @@ _LIBCPP_ALWAYS_INLINE int __builtin_clzll( unsigned long long x )
    return static_cast<int>(r);
 }
 #endif // !__clang__
-#endif // _LIBCPP_MSVCRT
+#endif // _MSC_VER

 #endif // _LIBCPP_SUPPORT_WIN32_SUPPORT_H
--- a/include/system_error
+++ b/include/system_error
@@ -22,7 +22,6 @@ class error_category
 public:
    virtual ~error_category() noexcept;

-    constexpr error_category();
    error_category(const error_category&) = delete;
    error_category& operator=(const error_category&) = delete;

@@ -233,13 +232,13 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 // is_error_code_enum

 template <class _Tp>
-struct _LIBCPP_TYPE_VIS_ONLY is_error_code_enum
+struct _LIBCPP_TYPE_VIS is_error_code_enum
    : public false_type {};

 // is_error_condition_enum

 template <class _Tp>
-struct _LIBCPP_TYPE_VIS_ONLY is_error_condition_enum
+struct _LIBCPP_TYPE_VIS is_error_condition_enum
    : public false_type {};

 // Some error codes are not present on all platforms, so we provide equivalents
@@ -346,12 +345,12 @@ _LIBCPP_DECLARE_STRONG_ENUM(errc)
 _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(errc)

 template <>
-struct _LIBCPP_TYPE_VIS_ONLY is_error_condition_enum<errc>
+struct _LIBCPP_TYPE_VIS is_error_condition_enum<errc>
    : true_type { };

 #ifdef _LIBCPP_HAS_NO_STRONG_ENUMS
 template <>
-struct _LIBCPP_TYPE_VIS_ONLY is_error_condition_enum<errc::__lx>
+struct _LIBCPP_TYPE_VIS is_error_condition_enum<errc::__lx>
    : true_type { };
 #endif

@@ -367,12 +366,7 @@ class _LIBCPP_TYPE_VIS error_category
 public:
    virtual ~error_category() _NOEXCEPT;

-#ifdef _LIBCPP_BUILDING_SYSTEM_ERROR
    error_category() _NOEXCEPT;
-#else
-    _LIBCPP_ALWAYS_INLINE
-    _LIBCPP_CONSTEXPR_AFTER_CXX11 error_category() _NOEXCEPT _LIBCPP_DEFAULT;
-#endif
 private:
    error_category(const error_category&);// = delete;
    error_category& operator=(const error_category&);// = delete;
@@ -403,8 +397,8 @@ public:
    virtual string message(int ev) const;
 };

-_LIBCPP_FUNC_VIS const error_category& generic_category() _NOEXCEPT;
-_LIBCPP_FUNC_VIS const error_category& system_category() _NOEXCEPT;
+const error_category& generic_category() _NOEXCEPT;
+const error_category& system_category() _NOEXCEPT;

 class _LIBCPP_TYPE_VIS error_condition
 {
@@ -603,7 +597,7 @@ operator!=(const error_condition& __x, const error_condition& __y) _NOEXCEPT
 {return !(__x == __y);}

 template <>
-struct _LIBCPP_TYPE_VIS_ONLY hash<error_code>
+struct _LIBCPP_TYPE_VIS hash<error_code>
    : public unary_function<error_code, size_t>
 {
    _LIBCPP_INLINE_VISIBILITY
@@ -635,7 +629,7 @@ private:
    static string __init(const error_code&, string);
 };

-_LIBCPP_FUNC_VIS void __throw_system_error(int ev, const char* what_arg);
+void __throw_system_error(int ev, const char* what_arg);

 _LIBCPP_END_NAMESPACE_STD

--- a/include/thread
+++ b/include/thread
@@ -185,9 +185,10 @@ _LIBCPP_INLINE_VISIBILITY __thread_id get_id() _NOEXCEPT;

 }  // this_thread

-template<> struct _LIBCPP_TYPE_VIS_ONLY hash<__thread_id>;
+class _LIBCPP_TYPE_VIS __thread_id;
+template<> struct _LIBCPP_TYPE_VIS hash<__thread_id>;

-class _LIBCPP_TYPE_VIS_ONLY __thread_id
+class _LIBCPP_TYPE_VIS __thread_id
 {
    // FIXME: pthread_t is a pointer on Darwin but a long on Linux.
    // NULL is the no-thread value on Darwin.  Someone needs to check
@@ -230,11 +231,11 @@ private:

    friend __thread_id this_thread::get_id() _NOEXCEPT;
    friend class _LIBCPP_TYPE_VIS thread;
-    friend struct _LIBCPP_TYPE_VIS_ONLY hash<__thread_id>;
+    friend struct _LIBCPP_TYPE_VIS hash<__thread_id>;
 };

 template<>
-struct _LIBCPP_TYPE_VIS_ONLY hash<__thread_id>
+struct _LIBCPP_TYPE_VIS hash<__thread_id>
    : public unary_function<__thread_id, size_t>
 {
    _LIBCPP_INLINE_VISIBILITY
@@ -306,7 +307,7 @@ class __assoc_sub_state;

 class _LIBCPP_HIDDEN __thread_struct_imp;

-class _LIBCPP_TYPE_VIS __thread_struct
+class __thread_struct
 {
    __thread_struct_imp* __p_;

@@ -320,7 +321,7 @@ public:
    void __make_ready_at_thread_exit(__assoc_sub_state*);
 };

-_LIBCPP_FUNC_VIS __thread_specific_ptr<__thread_struct>& __thread_local_data();
+__thread_specific_ptr<__thread_struct>& __thread_local_data();

 #ifndef _LIBCPP_HAS_NO_VARIADICS

@@ -404,7 +405,7 @@ void swap(thread& __x, thread& __y) _NOEXCEPT {__x.swap(__y);}
 namespace this_thread
 {

-_LIBCPP_FUNC_VIS void sleep_for(const chrono::nanoseconds& ns);
+void sleep_for(const chrono::nanoseconds& ns);

 template <class _Rep, class _Period>
 void
--- a/include/tuple
+++ b/include/tuple
@@ -21,19 +21,19 @@ template <class... T>
 class tuple {
 public:
    constexpr tuple();
-    explicit tuple(const T&...);  // constexpr in C++14
+    explicit tuple(const T&...);
    template <class... U>
-        explicit tuple(U&&...);  // constexpr in C++14
+        explicit tuple(U&&...);
    tuple(const tuple&) = default;
    tuple(tuple&&) = default;
    template <class... U>
-        tuple(const tuple<U...>&);  // constexpr in C++14
+        tuple(const tuple<U...>&);
    template <class... U>
-        tuple(tuple<U...>&&);  // constexpr in C++14
+        tuple(tuple<U...>&&);
    template <class U1, class U2>
-        tuple(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++14
+        tuple(const pair<U1, U2>&); // iff sizeof...(T) == 2
    template <class U1, class U2>
-        tuple(pair<U1, U2>&&); // iff sizeof...(T) == 2  // constexpr in C++14
+        tuple(pair<U1, U2>&&); // iff sizeof...(T) == 2

    // allocator-extended constructors
    template <class Alloc>
@@ -72,10 +72,10 @@ public:

 const unspecified ignore;

-template <class... T> tuple<V...>  make_tuple(T&&...); // constexpr in C++14
-template <class... T> tuple<ATypes...> forward_as_tuple(T&&...) noexcept; // constexpr in C++14
+template <class... T> tuple<V...>  make_tuple(T&&...);
+template <class... T> tuple<ATypes...> forward_as_tuple(T&&...) noexcept;
 template <class... T> tuple<T&...> tie(T&...) noexcept;
-template <class... Tuples> tuple<CTypes...> tuple_cat(Tuples&&... tpls); // constexpr in C++14
+template <class... Tuples> tuple<CTypes...> tuple_cat(Tuples&&... tpls);
  
 // 20.4.1.4, tuple helper classes:
 template <class T> class tuple_size; // undefined
@@ -86,28 +86,21 @@ template <intsize_t I, class... T> class tuple_element<I, tuple<T...>>;
 // 20.4.1.5, element access:
 template <intsize_t I, class... T>
    typename tuple_element<I, tuple<T...>>::type&
-    get(tuple<T...>&) noexcept; // constexpr in C++14
+    get(tuple<T...>&) noexcept;
 template <intsize_t I, class... T>
    typename tuple_element<I, tuple<T...>>::type const&
-    get(const tuple<T...>&) noexcept; // constexpr in C++14
+    get(const tuple<T...>&) noexcept;
 template <intsize_t I, class... T>
    typename tuple_element<I, tuple<T...>>::type&&
-    get(tuple<T...>&&) noexcept; // constexpr in C++14
-
-template <class T1, class... T>
-    constexpr T1& get(tuple<T...>&) noexcept;  // C++14
-template <class T1, class... T>
-    constexpr T1 const& get(const tuple<T...>&) noexcept;   // C++14
-template <class T1, class... T>
-    constexpr T1&& get(tuple<T...>&&) noexcept;   // C++14
+    get(tuple<T...>&&) noexcept;

 // 20.4.1.6, relational operators:
-template<class... T, class... U> bool operator==(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
-template<class... T, class... U> bool operator<(const tuple<T...>&, const tuple<U...>&);  // constexpr in C++14
-template<class... T, class... U> bool operator!=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
-template<class... T, class... U> bool operator>(const tuple<T...>&, const tuple<U...>&);  // constexpr in C++14
-template<class... T, class... U> bool operator<=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
-template<class... T, class... U> bool operator>=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
+template<class... T, class... U> bool operator==(const tuple<T...>&, const tuple<U...>&);
+template<class... T, class... U> bool operator<(const tuple<T...>&, const tuple<U...>&);
+template<class... T, class... U> bool operator!=(const tuple<T...>&, const tuple<U...>&);
+template<class... T, class... U> bool operator>(const tuple<T...>&, const tuple<U...>&);
+template<class... T, class... U> bool operator<=(const tuple<T...>&, const tuple<U...>&);
+template<class... T, class... U> bool operator>=(const tuple<T...>&, const tuple<U...>&);

 template <class... Types, class Alloc>
  struct uses_allocator<tuple<Types...>, Alloc>;
@@ -133,12 +126,74 @@ template <class... Types>

 _LIBCPP_BEGIN_NAMESPACE_STD

+// allocator_arg_t
+
+struct _LIBCPP_TYPE_VIS allocator_arg_t { };
+
+#if defined(_LIBCPP_HAS_NO_CONSTEXPR) || defined(_LIBCPP_BUILDING_MEMORY)
+extern const allocator_arg_t allocator_arg;
+#else
+constexpr allocator_arg_t allocator_arg = allocator_arg_t();
+#endif
+
+// uses_allocator
+
+template <class _Tp>
+struct __has_allocator_type
+{
+private:
+    struct __two {char __lx; char __lxx;};
+    template <class _Up> static __two __test(...);
+    template <class _Up> static char __test(typename _Up::allocator_type* = 0);
+public:
+    static const bool value = sizeof(__test<_Tp>(0)) == 1;
+};
+
+template <class _Tp, class _Alloc, bool = __has_allocator_type<_Tp>::value>
+struct __uses_allocator
+    : public integral_constant<bool,
+        is_convertible<_Alloc, typename _Tp::allocator_type>::value>
+{
+};
+
+template <class _Tp, class _Alloc>
+struct __uses_allocator<_Tp, _Alloc, false>
+    : public false_type
+{
+};
+
+template <class _Tp, class _Alloc>
+struct _LIBCPP_TYPE_VIS uses_allocator
+    : public __uses_allocator<_Tp, _Alloc>
+{
+};
+
+#ifndef _LIBCPP_HAS_NO_VARIADICS
+
+// uses-allocator construction
+
+template <class _Tp, class _Alloc, class ..._Args>
+struct __uses_alloc_ctor_imp
+{
+    static const bool __ua = uses_allocator<_Tp, _Alloc>::value;
+    static const bool __ic =
+        is_constructible<_Tp, allocator_arg_t, _Alloc, _Args...>::value;
+    static const int value = __ua ? 2 - __ic : 0;
+};
+
+template <class _Tp, class _Alloc, class ..._Args>
+struct __uses_alloc_ctor
+    : integral_constant<int, __uses_alloc_ctor_imp<_Tp, _Alloc, _Args...>::value>
+    {};
+
+#endif  // _LIBCPP_HAS_NO_VARIADICS
+
 #ifndef _LIBCPP_HAS_NO_VARIADICS

 // tuple_size

 template <class ..._Tp>
-class _LIBCPP_TYPE_VIS_ONLY tuple_size<tuple<_Tp...> >
+class _LIBCPP_TYPE_VIS tuple_size<tuple<_Tp...> >
    : public integral_constant<size_t, sizeof...(_Tp)>
 {
 };
@@ -146,7 +201,7 @@ class _LIBCPP_TYPE_VIS_ONLY tuple_size<tuple<_Tp...> >
 // tuple_element

 template <size_t _Ip, class ..._Tp>
-class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, tuple<_Tp...> >
+class _LIBCPP_TYPE_VIS tuple_element<_Ip, tuple<_Tp...> >
 {
 public:
    typedef typename tuple_element<_Ip, __tuple_types<_Tp...> >::type type;
@@ -204,7 +259,7 @@ public:

    template <class _Tp,
              class = typename enable_if<is_constructible<_Hp, _Tp>::value>::type>
-        _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+        _LIBCPP_INLINE_VISIBILITY
        explicit __tuple_leaf(_Tp&& __t) _NOEXCEPT_((is_nothrow_constructible<_Hp, _Tp>::value))
            : value(_VSTD::forward<_Tp>(__t))
        {static_assert(!is_reference<_Hp>::value ||
@@ -261,17 +316,15 @@ public:
                                >::value)),
       "Attempted to construct a reference element in a tuple with an rvalue");}

-    _LIBCPP_INLINE_VISIBILITY
-    _LIBCPP_CONSTEXPR_AFTER_CXX11
    __tuple_leaf(const __tuple_leaf& __t) _NOEXCEPT_(is_nothrow_copy_constructible<_Hp>::value)
        : value(__t.get())
        {static_assert(!is_rvalue_reference<_Hp>::value, "Can not copy a tuple with rvalue reference member");}

-    _LIBCPP_INLINE_VISIBILITY
-    _LIBCPP_CONSTEXPR_AFTER_CXX11
-    __tuple_leaf(__tuple_leaf&& __t) _NOEXCEPT_(is_nothrow_move_constructible<_Hp>::value)
-        : value(_VSTD::forward<_Hp>(__t.get()))
-        {}
+    template <class _Tp>
+        _LIBCPP_INLINE_VISIBILITY
+        explicit __tuple_leaf(const __tuple_leaf<_Ip, _Tp>& __t)
+                           _NOEXCEPT_((is_nothrow_constructible<_Hp, const _Tp&>::value))
+            : value(__t.get()) {}

    template <class _Tp>
        _LIBCPP_INLINE_VISIBILITY
@@ -289,8 +342,8 @@ public:
        return 0;
    }

-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11       _Hp& get()       _NOEXCEPT {return value;}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const _Hp& get() const _NOEXCEPT {return value;}
+    _LIBCPP_INLINE_VISIBILITY       _Hp& get()       _NOEXCEPT {return value;}
+    _LIBCPP_INLINE_VISIBILITY const _Hp& get() const _NOEXCEPT {return value;}
 };

 template <size_t _Ip, class _Hp>
@@ -319,7 +372,7 @@ public:

    template <class _Tp,
              class = typename enable_if<is_constructible<_Hp, _Tp>::value>::type>
-        _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+        _LIBCPP_INLINE_VISIBILITY
        explicit __tuple_leaf(_Tp&& __t) _NOEXCEPT_((is_nothrow_constructible<_Hp, _Tp>::value))
            : _Hp(_VSTD::forward<_Tp>(__t)) {}

@@ -338,6 +391,12 @@ public:
        explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t)
            : _Hp(_VSTD::forward<_Tp>(__t), __a) {}

+    template <class _Tp>
+        _LIBCPP_INLINE_VISIBILITY
+        explicit __tuple_leaf(const __tuple_leaf<_Ip, _Tp>& __t)
+            _NOEXCEPT_((is_nothrow_constructible<_Hp, const _Tp&>::value))
+            : _Hp(__t.get()) {}
+
    template <class _Tp>
        _LIBCPP_INLINE_VISIBILITY
        __tuple_leaf&
@@ -355,8 +414,8 @@ public:
        return 0;
    }

-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11       _Hp& get()       _NOEXCEPT {return static_cast<_Hp&>(*this);}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const _Hp& get() const _NOEXCEPT {return static_cast<const _Hp&>(*this);}
+    _LIBCPP_INLINE_VISIBILITY       _Hp& get()       _NOEXCEPT {return static_cast<_Hp&>(*this);}
+    _LIBCPP_INLINE_VISIBILITY const _Hp& get() const _NOEXCEPT {return static_cast<const _Hp&>(*this);}
 };

 template <class ..._Tp>
@@ -391,7 +450,7 @@ struct __tuple_impl<__tuple_indices<_Indx...>, _Tp...>

    template <size_t ..._Uf, class ..._Tf,
              size_t ..._Ul, class ..._Tl, class ..._Up>
-        _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+        _LIBCPP_INLINE_VISIBILITY
        explicit
        __tuple_impl(__tuple_indices<_Uf...>, __tuple_types<_Tf...>,
                     __tuple_indices<_Ul...>, __tuple_types<_Tl...>,
@@ -421,7 +480,7 @@ struct __tuple_impl<__tuple_indices<_Indx...>, _Tp...>
                         __tuple_constructible<_Tuple, tuple<_Tp...> >::value
                      >::type
             >
-        _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+        _LIBCPP_INLINE_VISIBILITY
        __tuple_impl(_Tuple&& __t) _NOEXCEPT_((__all<is_nothrow_constructible<_Tp, typename tuple_element<_Indx,
                                       typename __make_tuple_types<_Tuple>::type>::type>::value...>::value))
            : __tuple_leaf<_Indx, _Tp>(_VSTD::forward<typename tuple_element<_Indx,
@@ -457,24 +516,13 @@ struct __tuple_impl<__tuple_indices<_Indx...>, _Tp...>
            return *this;
        }

-    __tuple_impl(const __tuple_impl&) = default;
-    __tuple_impl(__tuple_impl&&) = default;
-
-    _LIBCPP_INLINE_VISIBILITY
-    __tuple_impl&
-    operator=(const __tuple_impl& __t) _NOEXCEPT_((__all<is_nothrow_copy_assignable<_Tp>::value...>::value))
-    {
-        __swallow(__tuple_leaf<_Indx, _Tp>::operator=(static_cast<const __tuple_leaf<_Indx, _Tp>&>(__t).get())...);
-        return *this;
-    }
-
-    _LIBCPP_INLINE_VISIBILITY
-    __tuple_impl&
-    operator=(__tuple_impl&& __t) _NOEXCEPT_((__all<is_nothrow_move_assignable<_Tp>::value...>::value))
-    {
-        __swallow(__tuple_leaf<_Indx, _Tp>::operator=(_VSTD::forward<_Tp>(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t).get()))...);
-        return *this;
-    }
+        _LIBCPP_INLINE_VISIBILITY
+        __tuple_impl&
+        operator=(const __tuple_impl& __t) _NOEXCEPT_((__all<is_nothrow_copy_assignable<_Tp>::value...>::value))
+        {
+            __swallow(__tuple_leaf<_Indx, _Tp>::operator=(static_cast<const __tuple_leaf<_Indx, _Tp>&>(__t).get())...);
+            return *this;
+        }

    _LIBCPP_INLINE_VISIBILITY
    void swap(__tuple_impl& __t)
@@ -485,17 +533,17 @@ struct __tuple_impl<__tuple_indices<_Indx...>, _Tp...>
 };

 template <class ..._Tp>
-class _LIBCPP_TYPE_VIS_ONLY tuple
+class _LIBCPP_TYPE_VIS tuple
 {
    typedef __tuple_impl<typename __make_tuple_indices<sizeof...(_Tp)>::type, _Tp...> base;

    base base_;

-    template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11
+    template <size_t _Jp, class ..._Up> friend
        typename tuple_element<_Jp, tuple<_Up...> >::type& get(tuple<_Up...>&) _NOEXCEPT;
-    template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11
+    template <size_t _Jp, class ..._Up> friend
        const typename tuple_element<_Jp, tuple<_Up...> >::type& get(const tuple<_Up...>&) _NOEXCEPT;
-    template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11
+    template <size_t _Jp, class ..._Up> friend
        typename tuple_element<_Jp, tuple<_Up...> >::type&& get(tuple<_Up...>&&) _NOEXCEPT;
 public:

@@ -503,7 +551,7 @@ public:
    _LIBCPP_CONSTEXPR tuple()
        _NOEXCEPT_(__all<is_nothrow_default_constructible<_Tp>::value...>::value) {}

-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+    _LIBCPP_INLINE_VISIBILITY
    explicit tuple(const _Tp& ... __t) _NOEXCEPT_((__all<is_nothrow_copy_constructible<_Tp>::value...>::value)) 
        : base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(),
                typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(),
@@ -538,7 +586,7 @@ public:
                         bool
                      >::type = false
             >
-        _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+        _LIBCPP_INLINE_VISIBILITY
        tuple(_Up&&... __u)
            _NOEXCEPT_((
                is_nothrow_constructible<
@@ -578,7 +626,7 @@ public:
                         bool
                      >::type =false
             >
-        _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+        _LIBCPP_INLINE_VISIBILITY
        explicit
        tuple(_Up&&... __u)
            _NOEXCEPT_((
@@ -626,7 +674,7 @@ public:
                         bool
                      >::type = false
             >
-        _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+        _LIBCPP_INLINE_VISIBILITY
        tuple(_Tuple&& __t) _NOEXCEPT_((is_nothrow_constructible<base, _Tuple>::value))
            : base_(_VSTD::forward<_Tuple>(__t)) {}

@@ -638,7 +686,7 @@ public:
                         bool
                      >::type = false
             >
-        _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+        _LIBCPP_INLINE_VISIBILITY
        explicit
        tuple(_Tuple&& __t) _NOEXCEPT_((is_nothrow_constructible<base, _Tuple>::value))
            : base_(_VSTD::forward<_Tuple>(__t)) {}
@@ -673,7 +721,7 @@ public:
 };

 template <>
-class _LIBCPP_TYPE_VIS_ONLY tuple<>
+class _LIBCPP_TYPE_VIS tuple<>
 {
 public:
    _LIBCPP_INLINE_VISIBILITY
@@ -708,7 +756,7 @@ swap(tuple<_Tp...>& __t, tuple<_Tp...>& __u)
 // get

 template <size_t _Ip, class ..._Tp>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 typename tuple_element<_Ip, tuple<_Tp...> >::type&
 get(tuple<_Tp...>& __t) _NOEXCEPT
 {
@@ -717,7 +765,7 @@ get(tuple<_Tp...>& __t) _NOEXCEPT
 }

 template <size_t _Ip, class ..._Tp>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 const typename tuple_element<_Ip, tuple<_Tp...> >::type&
 get(const tuple<_Tp...>& __t) _NOEXCEPT
 {
@@ -726,7 +774,7 @@ get(const tuple<_Tp...>& __t) _NOEXCEPT
 }

 template <size_t _Ip, class ..._Tp>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 typename tuple_element<_Ip, tuple<_Tp...> >::type&&
 get(tuple<_Tp...>&& __t) _NOEXCEPT
 {
@@ -735,64 +783,6 @@ get(tuple<_Tp...>&& __t) _NOEXCEPT
             static_cast<__tuple_leaf<_Ip, type>&&>(__t.base_).get());
 }

-#if _LIBCPP_STD_VER > 11
-// get by type
-template <typename _T1, size_t _Idx, typename... _Args>
-struct __find_exactly_one_t_helper;
-
-// -- find exactly one
-template <typename _T1, size_t _Idx, typename... _Args>
-struct __find_exactly_one_t_checker {
-    static constexpr size_t value = _Idx;
-//  Check the rest of the list to make sure there's only one
-    static_assert ( __find_exactly_one_t_helper<_T1, 0, _Args...>::value == -1, "type can only occur once in type list" );
-    };
-
-
-template <typename _T1, size_t _Idx>
-struct __find_exactly_one_t_helper <_T1, _Idx> {
-    static constexpr size_t value = -1;
-    };
-
-template <typename _T1, size_t _Idx, typename _Head, typename... _Args>
-struct __find_exactly_one_t_helper <_T1, _Idx, _Head, _Args...> {
-    static constexpr size_t value =
-        std::conditional<
-            std::is_same<_T1, _Head>::value,
-            __find_exactly_one_t_checker<_T1, _Idx,   _Args...>,
-            __find_exactly_one_t_helper <_T1, _Idx+1, _Args...>
-        >::type::value;
-    };
-
-template <typename _T1, typename... _Args>
-struct __find_exactly_one_t {
-    static constexpr size_t value = __find_exactly_one_t_helper<_T1, 0, _Args...>::value;
-    static_assert ( value != -1, "type not found in type list" );
-    };
-
-template <class _T1, class... _Args>
-inline _LIBCPP_INLINE_VISIBILITY
-constexpr _T1& get(tuple<_Args...>& __tup) noexcept
-{
-    return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup);
-}
-
-template <class _T1, class... _Args>
-inline _LIBCPP_INLINE_VISIBILITY
-constexpr _T1 const& get(tuple<_Args...> const& __tup) noexcept
-{
-    return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup);
-}
-
-template <class _T1, class... _Args>
-inline _LIBCPP_INLINE_VISIBILITY
-constexpr _T1&& get(tuple<_Args...>&& __tup) noexcept
-{
-    return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move(__tup));
-}
-
-#endif
-
 // tie

 template <class ..._Tp>
@@ -813,7 +803,7 @@ struct __ignore_t

 namespace { const __ignore_t<unsigned char> ignore = __ignore_t<unsigned char>(); }

-template <class _Tp> class _LIBCPP_TYPE_VIS_ONLY reference_wrapper;
+template <class _Tp> class _LIBCPP_TYPE_VIS reference_wrapper;

 template <class _Tp>
 struct ___make_tuple_return
@@ -834,7 +824,7 @@ struct __make_tuple_return
 };

 template <class... _Tp>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 tuple<typename __make_tuple_return<_Tp>::type...>
 make_tuple(_Tp&&... __t)
 {
@@ -842,7 +832,7 @@ make_tuple(_Tp&&... __t)
 }

 template <class... _Tp>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 tuple<_Tp&&...>
 forward_as_tuple(_Tp&&... __t) _NOEXCEPT
 {
@@ -853,7 +843,7 @@ template <size_t _Ip>
 struct __tuple_equal
 {
    template <class _Tp, class _Up>
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+    _LIBCPP_INLINE_VISIBILITY
    bool operator()(const _Tp& __x, const _Up& __y)
    {
        return __tuple_equal<_Ip - 1>()(__x, __y) && get<_Ip-1>(__x) == get<_Ip-1>(__y);
@@ -864,7 +854,7 @@ template <>
 struct __tuple_equal<0>
 {
    template <class _Tp, class _Up>
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+    _LIBCPP_INLINE_VISIBILITY
    bool operator()(const _Tp&, const _Up&)
    {
        return true;
@@ -872,7 +862,7 @@ struct __tuple_equal<0>
 };

 template <class ..._Tp, class ..._Up>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator==(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
 {
@@ -880,7 +870,7 @@ operator==(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
 }

 template <class ..._Tp, class ..._Up>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator!=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
 {
@@ -891,7 +881,7 @@ template <size_t _Ip>
 struct __tuple_less
 {
    template <class _Tp, class _Up>
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+    _LIBCPP_INLINE_VISIBILITY
    bool operator()(const _Tp& __x, const _Up& __y)
    {
        return __tuple_less<_Ip-1>()(__x, __y) ||
@@ -903,7 +893,7 @@ template <>
 struct __tuple_less<0>
 {
    template <class _Tp, class _Up>
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+    _LIBCPP_INLINE_VISIBILITY
    bool operator()(const _Tp&, const _Up&)
    {
        return false;
@@ -911,7 +901,7 @@ struct __tuple_less<0>
 };

 template <class ..._Tp, class ..._Up>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator<(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
 {
@@ -919,7 +909,7 @@ operator<(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
 }

 template <class ..._Tp, class ..._Up>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
 {
@@ -927,7 +917,7 @@ operator>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
 }

 template <class ..._Tp, class ..._Up>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator>=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
 {
@@ -935,7 +925,7 @@ operator>=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
 }

 template <class ..._Tp, class ..._Up>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator<=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
 {
@@ -993,7 +983,7 @@ struct __tuple_cat_return<>
    typedef tuple<> type;
 };

-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 tuple<>
 tuple_cat()
 {
@@ -1040,16 +1030,16 @@ template <class ..._Types, size_t ..._I0, size_t ..._J0>
 struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J0...> >
 {
    template <class _Tuple0>
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+    _LIBCPP_INLINE_VISIBILITY
    typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&>::type
    operator()(tuple<_Types...> __t, _Tuple0&& __t0)
    {
-        return forward_as_tuple(_VSTD::forward<_Types>(get<_I0>(__t))...,
+        return _VSTD::forward_as_tuple(_VSTD::forward<_Types>(get<_I0>(__t))...,
                                      get<_J0>(_VSTD::forward<_Tuple0>(__t0))...);
    }

    template <class _Tuple0, class _Tuple1, class ..._Tuples>
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+    _LIBCPP_INLINE_VISIBILITY
    typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&, _Tuple1&&, _Tuples&&...>::type
    operator()(tuple<_Types...> __t, _Tuple0&& __t0, _Tuple1&& __t1, _Tuples&& ...__tpls)
    {
@@ -1059,7 +1049,7 @@ struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J
           tuple<_Types..., typename __apply_cv<_Tuple0, typename tuple_element<_J0, _T0>::type>::type&&...>,
           typename __make_tuple_indices<sizeof ...(_Types) + tuple_size<_T0>::value>::type,
           typename __make_tuple_indices<tuple_size<_T1>::value>::type>()
-                           (forward_as_tuple(
+                           (_VSTD::forward_as_tuple(
                              _VSTD::forward<_Types>(get<_I0>(__t))...,
                              get<_J0>(_VSTD::forward<_Tuple0>(__t0))...
                            ),
@@ -1069,7 +1059,7 @@ struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J
 };

 template <class _Tuple0, class... _Tuples>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 typename __tuple_cat_return<_Tuple0, _Tuples...>::type
 tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls)
 {
@@ -1081,7 +1071,7 @@ tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls)
 }

 template <class ..._Tp, class _Alloc>
-struct _LIBCPP_TYPE_VIS_ONLY uses_allocator<tuple<_Tp...>, _Alloc>
+struct _LIBCPP_TYPE_VIS uses_allocator<tuple<_Tp...>, _Alloc>
    : true_type {};

 template <class _T1, class _T2>
--- a/include/type_traits
+++ b/include/type_traits
--- a/include/typeindex
+++ b/include/typeindex
@@ -55,7 +55,7 @@ struct hash<type_index>

 _LIBCPP_BEGIN_NAMESPACE_STD

-class _LIBCPP_TYPE_VIS_ONLY type_index
+class _LIBCPP_TYPE_VIS type_index
 {
    const type_info* __t_;
 public:
@@ -87,10 +87,10 @@ public:
    const char* name() const _NOEXCEPT {return __t_->name();}
 };

-template <class _Tp> struct _LIBCPP_TYPE_VIS_ONLY hash;
+template <class _Tp> struct _LIBCPP_TYPE_VIS hash;

 template <>
-struct _LIBCPP_TYPE_VIS_ONLY hash<type_index>
+struct _LIBCPP_TYPE_VIS hash<type_index>
    : public unary_function<type_index, size_t>
 {
    _LIBCPP_INLINE_VISIBILITY
--- a/include/unordered_map
+++ b/include/unordered_map
--- a/include/unordered_set
+++ b/include/unordered_set
@@ -68,16 +68,6 @@ public:
    unordered_set(initializer_list<value_type>, size_type n = 0,
                  const hasher& hf = hasher(), const key_equal& eql = key_equal(),
                  const allocator_type& a = allocator_type());
-    unordered_set(size_type n, const allocator_type& a); // C++14
-    unordered_set(size_type n, const hasher& hf, const allocator_type& a); // C++14
-    template <class InputIterator>
-      unordered_set(InputIterator f, InputIterator l, size_type n, const allocator_type& a); // C++14
-    template <class InputIterator>
-      unordered_set(InputIterator f, InputIterator l, size_type n, 
-                    const hasher& hf,  const allocator_type& a); // C++14
-    unordered_set(initializer_list<value_type> il, size_type n, const allocator_type& a); // C++14
-    unordered_set(initializer_list<value_type> il, size_type n,
-                  const hasher& hf,  const allocator_type& a); // C++14
    ~unordered_set();
    unordered_set& operator=(const unordered_set&);
    unordered_set& operator=(unordered_set&&)
@@ -217,16 +207,6 @@ public:
    unordered_multiset(initializer_list<value_type>, size_type n = /see below/,
                  const hasher& hf = hasher(), const key_equal& eql = key_equal(),
                  const allocator_type& a = allocator_type());
-    unordered_multiset(size_type n, const allocator_type& a); // C++14
-    unordered_multiset(size_type n, const hasher& hf, const allocator_type& a); // C++14
-    template <class InputIterator>
-      unordered_multiset(InputIterator f, InputIterator l, size_type n, const allocator_type& a); // C++14
-    template <class InputIterator>
-      unordered_multiset(InputIterator f, InputIterator l, size_type n,
-                         const hasher& hf, const allocator_type& a); // C++14
-    unordered_multiset(initializer_list<value_type> il, size_type n, const allocator_type& a); // C++14
-    unordered_multiset(initializer_list<value_type> il, size_type n, 
-                       const hasher& hf,  const allocator_type& a); // C++14
    ~unordered_multiset();
    unordered_multiset& operator=(const unordered_multiset&);
    unordered_multiset& operator=(unordered_multiset&&)
@@ -333,7 +313,7 @@ _LIBCPP_BEGIN_NAMESPACE_STD

 template <class _Value, class _Hash = hash<_Value>, class _Pred = equal_to<_Value>,
          class _Alloc = allocator<_Value> >
-class _LIBCPP_TYPE_VIS_ONLY unordered_set
+class _LIBCPP_TYPE_VIS unordered_set
 {
 public:
    // types
@@ -344,8 +324,6 @@ public:
    typedef _Alloc                                                     allocator_type;
    typedef value_type&                                                reference;
    typedef const value_type&                                          const_reference;
-    static_assert((is_same<value_type, typename allocator_type::value_type>::value),
-                  "Invalid allocator::value_type");

 private:
    typedef __hash_table<value_type, hasher, key_equal, allocator_type> __table;
@@ -366,21 +344,9 @@ public:
    _LIBCPP_INLINE_VISIBILITY
    unordered_set()
        _NOEXCEPT_(is_nothrow_default_constructible<__table>::value)
-        {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-            __get_db()->__insert_c(this);
-#endif
-        }
+        {} // = default;
    explicit unordered_set(size_type __n, const hasher& __hf = hasher(),
                           const key_equal& __eql = key_equal());
-#if _LIBCPP_STD_VER > 11
-    inline _LIBCPP_INLINE_VISIBILITY
-    unordered_set(size_type __n, const allocator_type& __a)
-        : unordered_set(__n, hasher(), key_equal(), __a) {}
-    inline _LIBCPP_INLINE_VISIBILITY
-    unordered_set(size_type __n, const hasher& __hf, const allocator_type& __a)
-        : unordered_set(__n, __hf, key_equal(), __a) {}
-#endif
    unordered_set(size_type __n, const hasher& __hf, const key_equal& __eql,
                  const allocator_type& __a);
    template <class _InputIterator>
@@ -393,17 +359,6 @@ public:
        unordered_set(_InputIterator __first, _InputIterator __last,
                      size_type __n, const hasher& __hf, const key_equal& __eql,
                      const allocator_type& __a);
-#if _LIBCPP_STD_VER > 11
-    template <class _InputIterator>
-    inline _LIBCPP_INLINE_VISIBILITY
-        unordered_set(_InputIterator __first, _InputIterator __last, 
-                    size_type __n, const allocator_type& __a)
-            : unordered_set(__first, __last, __n, hasher(), key_equal(), __a) {}
-    template <class _InputIterator>
-        unordered_set(_InputIterator __first, _InputIterator __last, 
-                      size_type __n, const hasher& __hf, const allocator_type& __a)
-            : unordered_set(__first, __last, __n, __hf, key_equal(), __a) {}
-#endif
    explicit unordered_set(const allocator_type& __a);
    unordered_set(const unordered_set& __u);
    unordered_set(const unordered_set& __u, const allocator_type& __a);
@@ -420,16 +375,6 @@ public:
    unordered_set(initializer_list<value_type> __il, size_type __n,
                  const hasher& __hf, const key_equal& __eql,
                  const allocator_type& __a);
-#if _LIBCPP_STD_VER > 11
-    inline _LIBCPP_INLINE_VISIBILITY
-    unordered_set(initializer_list<value_type> __il, size_type __n,
-                                                      const allocator_type& __a)
-        : unordered_set(__il, __n, hasher(), key_equal(), __a) {}
-    inline _LIBCPP_INLINE_VISIBILITY
-    unordered_set(initializer_list<value_type> __il, size_type __n, 
-                                  const hasher& __hf, const allocator_type& __a)
-        : unordered_set(__il, __n, __hf, key_equal(), __a) {}
-#endif
 #endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
    // ~unordered_set() = default;
    _LIBCPP_INLINE_VISIBILITY
@@ -477,18 +422,8 @@ public:
            {return __table_.__emplace_unique(_VSTD::forward<_Args>(__args)...);}
    template <class... _Args>
        _LIBCPP_INLINE_VISIBILITY
-#if _LIBCPP_DEBUG_LEVEL >= 2
-        iterator emplace_hint(const_iterator __p, _Args&&... __args)
-        {
-            _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
-                "unordered_set::emplace_hint(const_iterator, args...) called with an iterator not"
-                " referring to this unordered_set");
-            return __table_.__emplace_unique(_VSTD::forward<_Args>(__args)...).first;
-        }
-#else
        iterator emplace_hint(const_iterator, _Args&&... __args)
            {return __table_.__emplace_unique(_VSTD::forward<_Args>(__args)...).first;}
-#endif
 #endif  // !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_VARIADICS)
    _LIBCPP_INLINE_VISIBILITY
    pair<iterator, bool> insert(const value_type& __x)
@@ -499,32 +434,12 @@ public:
        {return __table_.__insert_unique(_VSTD::move(__x));}
 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
    _LIBCPP_INLINE_VISIBILITY
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    iterator insert(const_iterator __p, const value_type& __x)
-        {
-            _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
-                "unordered_set::insert(const_iterator, const value_type&) called with an iterator not"
-                " referring to this unordered_set");
-            return insert(__x).first;
-        }
-#else
    iterator insert(const_iterator, const value_type& __x)
        {return insert(__x).first;}
-#endif
 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
    _LIBCPP_INLINE_VISIBILITY
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    iterator insert(const_iterator __p, value_type&& __x)
-        {
-            _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
-                "unordered_set::insert(const_iterator, value_type&&) called with an iterator not"
-                " referring to this unordered_set");
-            return insert(_VSTD::move(__x)).first;
-        }
-#else
    iterator insert(const_iterator, value_type&& __x)
        {return insert(_VSTD::move(__x)).first;}
-#endif
 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
    template <class _InputIterator>
        void insert(_InputIterator __first, _InputIterator __last);
@@ -600,20 +515,6 @@ public:
    void rehash(size_type __n) {__table_.rehash(__n);}
    _LIBCPP_INLINE_VISIBILITY
    void reserve(size_type __n) {__table_.reserve(__n);}
-
-#if _LIBCPP_DEBUG_LEVEL >= 2
-
-    bool __dereferenceable(const const_iterator* __i) const
-        {return __table_.__dereferenceable(__i);}
-    bool __decrementable(const const_iterator* __i) const
-        {return __table_.__decrementable(__i);}
-    bool __addable(const const_iterator* __i, ptrdiff_t __n) const
-        {return __table_.__addable(__i, __n);}
-    bool __subscriptable(const const_iterator* __i, ptrdiff_t __n) const
-        {return __table_.__addable(__i, __n);}
-
-#endif  // _LIBCPP_DEBUG_LEVEL >= 2
-
 };

 template <class _Value, class _Hash, class _Pred, class _Alloc>
@@ -621,9 +522,6 @@ unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(size_type __n,
        const hasher& __hf, const key_equal& __eql)
    : __table_(__hf, __eql)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    __table_.rehash(__n);
 }

@@ -632,9 +530,6 @@ unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(size_type __n,
        const hasher& __hf, const key_equal& __eql, const allocator_type& __a)
    : __table_(__hf, __eql, __a)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    __table_.rehash(__n);
 }

@@ -643,9 +538,6 @@ template <class _InputIterator>
 unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(
        _InputIterator __first, _InputIterator __last)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    insert(__first, __last);
 }

@@ -656,9 +548,6 @@ unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(
        const hasher& __hf, const key_equal& __eql)
    : __table_(__hf, __eql)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    __table_.rehash(__n);
    insert(__first, __last);
 }
@@ -670,9 +559,6 @@ unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(
        const hasher& __hf, const key_equal& __eql, const allocator_type& __a)
    : __table_(__hf, __eql, __a)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    __table_.rehash(__n);
    insert(__first, __last);
 }
@@ -683,9 +569,6 @@ unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(
        const allocator_type& __a)
    : __table_(__a)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
 }

 template <class _Value, class _Hash, class _Pred, class _Alloc>
@@ -693,9 +576,6 @@ unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(
        const unordered_set& __u)
    : __table_(__u.__table_)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    __table_.rehash(__u.bucket_count());
    insert(__u.begin(), __u.end());
 }
@@ -705,9 +585,6 @@ unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(
        const unordered_set& __u, const allocator_type& __a)
    : __table_(__u.__table_, __a)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    __table_.rehash(__u.bucket_count());
    insert(__u.begin(), __u.end());
 }
@@ -721,10 +598,6 @@ unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(
    _NOEXCEPT_(is_nothrow_move_constructible<__table>::value)
    : __table_(_VSTD::move(__u.__table_))
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-    __get_db()->swap(this, &__u);
-#endif
 }

 template <class _Value, class _Hash, class _Pred, class _Alloc>
@@ -732,19 +605,12 @@ unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(
        unordered_set&& __u, const allocator_type& __a)
    : __table_(_VSTD::move(__u.__table_), __a)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    if (__a != __u.get_allocator())
    {
        iterator __i = __u.begin();
        while (__u.size() != 0)
            __table_.__insert_unique(_VSTD::move(__u.__table_.remove(__i++)->__value_));
    }
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    else
-        __get_db()->swap(this, &__u);
-#endif
 }

 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
@@ -755,9 +621,6 @@ template <class _Value, class _Hash, class _Pred, class _Alloc>
 unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(
        initializer_list<value_type> __il)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    insert(__il.begin(), __il.end());
 }

@@ -767,9 +630,6 @@ unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(
        const key_equal& __eql)
    : __table_(__hf, __eql)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    __table_.rehash(__n);
    insert(__il.begin(), __il.end());
 }
@@ -780,9 +640,6 @@ unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(
        const key_equal& __eql, const allocator_type& __a)
    : __table_(__hf, __eql, __a)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    __table_.rehash(__n);
    insert(__il.begin(), __il.end());
 }
@@ -868,7 +725,7 @@ operator!=(const unordered_set<_Value, _Hash, _Pred, _Alloc>& __x,

 template <class _Value, class _Hash = hash<_Value>, class _Pred = equal_to<_Value>,
          class _Alloc = allocator<_Value> >
-class _LIBCPP_TYPE_VIS_ONLY unordered_multiset
+class _LIBCPP_TYPE_VIS unordered_multiset
 {
 public:
    // types
@@ -879,8 +736,6 @@ public:
    typedef _Alloc                                                     allocator_type;
    typedef value_type&                                                reference;
    typedef const value_type&                                          const_reference;
-    static_assert((is_same<value_type, typename allocator_type::value_type>::value),
-                  "Invalid allocator::value_type");

 private:
    typedef __hash_table<value_type, hasher, key_equal, allocator_type> __table;
@@ -901,23 +756,11 @@ public:
    _LIBCPP_INLINE_VISIBILITY
    unordered_multiset()
        _NOEXCEPT_(is_nothrow_default_constructible<__table>::value)
-        {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-            __get_db()->__insert_c(this);
-#endif
-        }
+        {} // = default
    explicit unordered_multiset(size_type __n, const hasher& __hf = hasher(),
                                const key_equal& __eql = key_equal());
    unordered_multiset(size_type __n, const hasher& __hf,
                       const key_equal& __eql, const allocator_type& __a);
-#if _LIBCPP_STD_VER > 11
-    inline _LIBCPP_INLINE_VISIBILITY
-    unordered_multiset(size_type __n, const allocator_type& __a)
-        : unordered_multiset(__n, hasher(), key_equal(), __a) {}
-    inline _LIBCPP_INLINE_VISIBILITY
-    unordered_multiset(size_type __n, const hasher& __hf, const allocator_type& __a)
-        : unordered_multiset(__n, __hf, key_equal(), __a) {}
-#endif
    template <class _InputIterator>
        unordered_multiset(_InputIterator __first, _InputIterator __last);
    template <class _InputIterator>
@@ -928,18 +771,6 @@ public:
        unordered_multiset(_InputIterator __first, _InputIterator __last,
                      size_type __n , const hasher& __hf,
                      const key_equal& __eql, const allocator_type& __a);
-#if _LIBCPP_STD_VER > 11
-    template <class _InputIterator>
-    inline _LIBCPP_INLINE_VISIBILITY
-    unordered_multiset(_InputIterator __first, _InputIterator __last, 
-                       size_type __n, const allocator_type& __a)
-        : unordered_multiset(__first, __last, __n, hasher(), key_equal(), __a) {}
-    template <class _InputIterator>
-    inline _LIBCPP_INLINE_VISIBILITY
-    unordered_multiset(_InputIterator __first, _InputIterator __last,
-                       size_type __n, const hasher& __hf, const allocator_type& __a)
-        : unordered_multiset(__first, __last, __n, __hf, key_equal(), __a) {}
-#endif
    explicit unordered_multiset(const allocator_type& __a);
    unordered_multiset(const unordered_multiset& __u);
    unordered_multiset(const unordered_multiset& __u, const allocator_type& __a);
@@ -956,14 +787,6 @@ public:
    unordered_multiset(initializer_list<value_type> __il, size_type __n,
                       const hasher& __hf, const key_equal& __eql,
                       const allocator_type& __a);
-#if _LIBCPP_STD_VER > 11
-    inline _LIBCPP_INLINE_VISIBILITY
-    unordered_multiset(initializer_list<value_type> __il, size_type __n, const allocator_type& __a)
-      : unordered_multiset(__il, __n, hasher(), key_equal(), __a) {}
-    inline _LIBCPP_INLINE_VISIBILITY
-    unordered_multiset(initializer_list<value_type> __il, size_type __n, const hasher& __hf, const allocator_type& __a)
-      : unordered_multiset(__il, __n, __hf, key_equal(), __a) {}
-#endif
 #endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
    // ~unordered_multiset() = default;
    _LIBCPP_INLINE_VISIBILITY
@@ -1102,20 +925,6 @@ public:
    void rehash(size_type __n) {__table_.rehash(__n);}
    _LIBCPP_INLINE_VISIBILITY
    void reserve(size_type __n) {__table_.reserve(__n);}
-
-#if _LIBCPP_DEBUG_LEVEL >= 2
-
-    bool __dereferenceable(const const_iterator* __i) const
-        {return __table_.__dereferenceable(__i);}
-    bool __decrementable(const const_iterator* __i) const
-        {return __table_.__decrementable(__i);}
-    bool __addable(const const_iterator* __i, ptrdiff_t __n) const
-        {return __table_.__addable(__i, __n);}
-    bool __subscriptable(const const_iterator* __i, ptrdiff_t __n) const
-        {return __table_.__addable(__i, __n);}
-
-#endif  // _LIBCPP_DEBUG_LEVEL >= 2
-
 };

 template <class _Value, class _Hash, class _Pred, class _Alloc>
@@ -1123,9 +932,6 @@ unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
        size_type __n, const hasher& __hf, const key_equal& __eql)
    : __table_(__hf, __eql)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    __table_.rehash(__n);
 }

@@ -1135,9 +941,6 @@ unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
        const allocator_type& __a)
    : __table_(__hf, __eql, __a)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    __table_.rehash(__n);
 }

@@ -1146,9 +949,6 @@ template <class _InputIterator>
 unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
        _InputIterator __first, _InputIterator __last)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    insert(__first, __last);
 }

@@ -1159,9 +959,6 @@ unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
        const hasher& __hf, const key_equal& __eql)
    : __table_(__hf, __eql)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    __table_.rehash(__n);
    insert(__first, __last);
 }
@@ -1173,9 +970,6 @@ unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
        const hasher& __hf, const key_equal& __eql, const allocator_type& __a)
    : __table_(__hf, __eql, __a)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    __table_.rehash(__n);
    insert(__first, __last);
 }
@@ -1186,9 +980,6 @@ unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
        const allocator_type& __a)
    : __table_(__a)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
 }

 template <class _Value, class _Hash, class _Pred, class _Alloc>
@@ -1196,9 +987,6 @@ unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
        const unordered_multiset& __u)
    : __table_(__u.__table_)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    __table_.rehash(__u.bucket_count());
    insert(__u.begin(), __u.end());
 }
@@ -1208,9 +996,6 @@ unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
        const unordered_multiset& __u, const allocator_type& __a)
    : __table_(__u.__table_, __a)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    __table_.rehash(__u.bucket_count());
    insert(__u.begin(), __u.end());
 }
@@ -1224,10 +1009,6 @@ unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
    _NOEXCEPT_(is_nothrow_move_constructible<__table>::value)
    : __table_(_VSTD::move(__u.__table_))
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-    __get_db()->swap(this, &__u);
-#endif
 }

 template <class _Value, class _Hash, class _Pred, class _Alloc>
@@ -1235,19 +1016,12 @@ unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
        unordered_multiset&& __u, const allocator_type& __a)
    : __table_(_VSTD::move(__u.__table_), __a)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    if (__a != __u.get_allocator())
    {
        iterator __i = __u.begin();
        while (__u.size() != 0)
            __table_.__insert_multi(_VSTD::move(__u.__table_.remove(__i++)->__value_));
    }
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    else
-        __get_db()->swap(this, &__u);
-#endif
 }

 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
@@ -1258,9 +1032,6 @@ template <class _Value, class _Hash, class _Pred, class _Alloc>
 unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
        initializer_list<value_type> __il)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    insert(__il.begin(), __il.end());
 }

@@ -1270,9 +1041,6 @@ unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
        const key_equal& __eql)
    : __table_(__hf, __eql)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    __table_.rehash(__n);
    insert(__il.begin(), __il.end());
 }
@@ -1283,9 +1051,6 @@ unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
        const key_equal& __eql, const allocator_type& __a)
    : __table_(__hf, __eql, __a)
 {
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
    __table_.rehash(__n);
    insert(__il.begin(), __il.end());
 }
--- a/include/utility
+++ b/include/utility
@@ -38,10 +38,10 @@ template <class T, size_t N>
 void
 swap(T (&a)[N], T (&b)[N]) noexcept(noexcept(swap(*a, *b)));

-template <class T> T&& forward(typename remove_reference<T>::type& t) noexcept;  // constexpr in C++14
-template <class T> T&& forward(typename remove_reference<T>::type&& t) noexcept; // constexpr in C++14
+template <class T> T&& forward(typename remove_reference<T>::type& t) noexcept;
+template <class T> T&& forward(typename remove_reference<T>::type&& t) noexcept;

-template <class T> typename remove_reference<T>::type&& move(T&&) noexcept;      // constexpr in C++14
+template <class T> typename remove_reference<T>::type&& move(T&&) noexcept;

 template <class T>
    typename conditional
@@ -50,7 +50,7 @@ template <class T>
        const T&,
        T&&
    >::type
-    move_if_noexcept(T& x) noexcept; // constexpr in C++14
+    move_if_noexcept(T& x) noexcept;

 template <class T> typename add_rvalue_reference<T>::type declval() noexcept;

@@ -66,10 +66,10 @@ struct pair
    pair(const pair&) = default;
    pair(pair&&) = default;
    constexpr pair();
-    pair(const T1& x, const T2& y);                          // constexpr in C++14
-    template <class U, class V> pair(U&& x, V&& y);          // constexpr in C++14
-    template <class U, class V> pair(const pair<U, V>& p);   // constexpr in C++14
-    template <class U, class V> pair(pair<U, V>&& p);        // constexpr in C++14
+    pair(const T1& x, const T2& y);
+    template <class U, class V> pair(U&& x, V&& y);
+    template <class U, class V> pair(const pair<U, V>& p);
+    template <class U, class V> pair(pair<U, V>&& p);
    template <class... Args1, class... Args2>
        pair(piecewise_construct_t, tuple<Args1...> first_args,
             tuple<Args2...> second_args);
@@ -83,14 +83,14 @@ struct pair
                                noexcept(swap(second, p.second)));
 };

-template <class T1, class T2> bool operator==(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
-template <class T1, class T2> bool operator!=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
-template <class T1, class T2> bool operator< (const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
-template <class T1, class T2> bool operator> (const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
-template <class T1, class T2> bool operator>=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
-template <class T1, class T2> bool operator<=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
+template <class T1, class T2> bool operator==(const pair<T1,T2>&, const pair<T1,T2>&);
+template <class T1, class T2> bool operator!=(const pair<T1,T2>&, const pair<T1,T2>&);
+template <class T1, class T2> bool operator< (const pair<T1,T2>&, const pair<T1,T2>&);
+template <class T1, class T2> bool operator> (const pair<T1,T2>&, const pair<T1,T2>&);
+template <class T1, class T2> bool operator>=(const pair<T1,T2>&, const pair<T1,T2>&);
+template <class T1, class T2> bool operator<=(const pair<T1,T2>&, const pair<T1,T2>&);

-template <class T1, class T2> pair<V1, V2> make_pair(T1&&, T2&&);   // constexpr in C++14
+template <class T1, class T2> pair<V1, V2> make_pair(T1&&, T2&&);
 template <class T1, class T2>
 void
 swap(pair<T1, T2>& x, pair<T1, T2>& y) noexcept(noexcept(x.swap(y)));
@@ -107,48 +107,16 @@ template <class T1, class T2> struct tuple_element<1, std::pair<T1, T2> >;

 template<size_t I, class T1, class T2>
    typename tuple_element<I, std::pair<T1, T2> >::type&
-    get(std::pair<T1, T2>&) noexcept; // constexpr in C++14
+    get(std::pair<T1, T2>&) noexcept;

 template<size_t I, class T1, class T2>
    const typename const tuple_element<I, std::pair<T1, T2> >::type&
-    get(const std::pair<T1, T2>&) noexcept; // constexpr in C++14
+    get(const std::pair<T1, T2>&) noexcept;

 template<size_t I, class T1, class T2>
    typename tuple_element<I, std::pair<T1, T2> >::type&&
-    get(std::pair<T1, T2>&&) noexcept; // constexpr in C++14
+    get(std::pair<T1, T2>&&) noexcept;

-template<class T1, class T2>
-    constexpr T1& get(std::pair<T1, T2>&) noexcept; // C++14
-
-template<size_t I, class T1, class T2>
-    constexpr T1 const& get(std::pair<T1, T2> const &) noexcept; // C++14
-
-template<size_t I, class T1, class T2>
-    constexpr T1&& get(std::pair<T1, T2>&&) noexcept; // C++14
-
-// C++14
-
-template<class T, T... I>
-struct integer_sequence
-{
-    typedef T value_type;
-
-    static constexpr size_t size() noexcept;
-};
-
-template<size_t... I>
-  using index_sequence = integer_sequence<size_t, I...>;
-
-template<class T, T N>
-  using make_integer_sequence = integer_sequence<T, 0, 1, ..., N-1>;
-template<size_t N>
-  using make_index_sequence = make_integer_sequence<size_t, N>;
-
-template<class... T>
-  using index_sequence_for = make_index_sequence<sizeof...(T)>;
-
-template<class T, class U=T> 
-    T exchange(T& obj, U&& new_value);
 }  // std

 */
@@ -221,7 +189,7 @@ swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::v
 }

 template <class _Tp>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 typename conditional
 <
@@ -237,7 +205,7 @@ move_if_noexcept(_Tp& __x) _NOEXCEPT
    return _VSTD::move(__x);
 }

-struct _LIBCPP_TYPE_VIS_ONLY piecewise_construct_t { };
+struct _LIBCPP_TYPE_VIS piecewise_construct_t { };
 #if defined(_LIBCPP_HAS_NO_CONSTEXPR) || defined(_LIBCPP_BUILDING_UTILITY)
 extern const piecewise_construct_t piecewise_construct;// = piecewise_construct_t();
 #else
@@ -245,7 +213,7 @@ constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();
 #endif

 template <class _T1, class _T2>
-struct _LIBCPP_TYPE_VIS_ONLY pair
+struct _LIBCPP_TYPE_VIS pair
 {
    typedef _T1 first_type;
    typedef _T2 second_type;
@@ -258,12 +226,11 @@ struct _LIBCPP_TYPE_VIS_ONLY pair

    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR pair() : first(), second() {}

-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
-    pair(const _T1& __x, const _T2& __y)
+    _LIBCPP_INLINE_VISIBILITY pair(const _T1& __x, const _T2& __y)
        : first(__x), second(__y) {}

    template<class _U1, class _U2>
-        _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+        _LIBCPP_INLINE_VISIBILITY
        pair(const pair<_U1, _U2>& __p
 #ifndef _LIBCPP_HAS_NO_ADVANCED_SFINAE
                 ,typename enable_if<is_convertible<const _U1&, _T1>::value &&
@@ -272,10 +239,6 @@ struct _LIBCPP_TYPE_VIS_ONLY pair
                                      )
            : first(__p.first), second(__p.second) {}

-#if !defined(_LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS) && _LIBCPP_TRIVIAL_PAIR_COPY_CTOR
-    _LIBCPP_INLINE_VISIBILITY
-    pair(const pair& __p) = default;
-#elif !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) || !_LIBCPP_TRIVIAL_PAIR_COPY_CTOR
    _LIBCPP_INLINE_VISIBILITY
    pair(const pair& __p)
        _NOEXCEPT_(is_nothrow_copy_constructible<first_type>::value &&
@@ -284,7 +247,6 @@ struct _LIBCPP_TYPE_VIS_ONLY pair
          second(__p.second)
    {
    }
-#endif

    _LIBCPP_INLINE_VISIBILITY
    pair& operator=(const pair& __p)
@@ -301,24 +263,20 @@ struct _LIBCPP_TYPE_VIS_ONLY pair
    template <class _U1, class _U2,
              class = typename enable_if<is_convertible<_U1, first_type>::value &&
                                         is_convertible<_U2, second_type>::value>::type>
-        _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+        _LIBCPP_INLINE_VISIBILITY
        pair(_U1&& __u1, _U2&& __u2)
            : first(_VSTD::forward<_U1>(__u1)),
              second(_VSTD::forward<_U2>(__u2))
            {}

    template<class _U1, class _U2>
-        _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+        _LIBCPP_INLINE_VISIBILITY
        pair(pair<_U1, _U2>&& __p,
                 typename enable_if<is_convertible<_U1, _T1>::value &&
                                    is_convertible<_U2, _T2>::value>::type* = 0)
            : first(_VSTD::forward<_U1>(__p.first)),
              second(_VSTD::forward<_U2>(__p.second)) {}

-#ifndef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
-    _LIBCPP_INLINE_VISIBILITY
-    pair(pair&& __p) = default;
-#else
    _LIBCPP_INLINE_VISIBILITY
    pair(pair&& __p) _NOEXCEPT_(is_nothrow_move_constructible<first_type>::value &&
                                is_nothrow_move_constructible<second_type>::value)
@@ -326,7 +284,6 @@ struct _LIBCPP_TYPE_VIS_ONLY pair
          second(_VSTD::forward<second_type>(__p.second))
    {
    }
-#endif

    _LIBCPP_INLINE_VISIBILITY
    pair&
@@ -342,7 +299,7 @@ struct _LIBCPP_TYPE_VIS_ONLY pair

    template<class _Tuple,
             class = typename enable_if<__tuple_convertible<_Tuple, pair>::value>::type>
-        _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+        _LIBCPP_INLINE_VISIBILITY
        pair(_Tuple&& __p)
            : first(_VSTD::forward<typename tuple_element<0,
                                  typename __make_tuple_types<_Tuple>::type>::type>(get<0>(__p))),
@@ -398,7 +355,7 @@ private:
 };

 template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator==(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
 {
@@ -406,7 +363,7 @@ operator==(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
 }

 template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
 {
@@ -414,7 +371,7 @@ operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
 }

 template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator< (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
 {
@@ -422,7 +379,7 @@ operator< (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
 }

 template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator> (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
 {
@@ -430,7 +387,7 @@ operator> (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
 }

 template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator>=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
 {
@@ -438,7 +395,7 @@ operator>=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
 }

 template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator<=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
 {
@@ -462,7 +419,7 @@ swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)

 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

-template <class _Tp> class _LIBCPP_TYPE_VIS_ONLY reference_wrapper;
+template <class _Tp> class _LIBCPP_TYPE_VIS reference_wrapper;

 template <class _Tp>
 struct ___make_pair_return
@@ -483,7 +440,7 @@ struct __make_pair_return
 };

 template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+inline _LIBCPP_INLINE_VISIBILITY
 pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type>
 make_pair(_T1&& __t1, _T2&& __t2)
 {
@@ -504,36 +461,36 @@ make_pair(_T1 __x, _T2 __y)
 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES

 template <class _T1, class _T2>
-  class _LIBCPP_TYPE_VIS_ONLY tuple_size<pair<_T1, _T2> >
+  class _LIBCPP_TYPE_VIS tuple_size<pair<_T1, _T2> >
    : public integral_constant<size_t, 2> {};

 template <class _T1, class _T2>
-  class _LIBCPP_TYPE_VIS_ONLY tuple_size<const pair<_T1, _T2> >
+  class _LIBCPP_TYPE_VIS tuple_size<const pair<_T1, _T2> >
    : public integral_constant<size_t, 2> {};

 template <class _T1, class _T2>
-class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, pair<_T1, _T2> >
+class _LIBCPP_TYPE_VIS tuple_element<0, pair<_T1, _T2> >
 {
 public:
    typedef _T1 type;
 };

 template <class _T1, class _T2>
-class _LIBCPP_TYPE_VIS_ONLY tuple_element<1, pair<_T1, _T2> >
+class _LIBCPP_TYPE_VIS tuple_element<1, pair<_T1, _T2> >
 {
 public:
    typedef _T2 type;
 };

 template <class _T1, class _T2>
-class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, const pair<_T1, _T2> >
+class _LIBCPP_TYPE_VIS tuple_element<0, const pair<_T1, _T2> >
 {
 public:
    typedef const _T1 type;
 };

 template <class _T1, class _T2>
-class _LIBCPP_TYPE_VIS_ONLY tuple_element<1, const pair<_T1, _T2> >
+class _LIBCPP_TYPE_VIS tuple_element<1, const pair<_T1, _T2> >
 {
 public:
    typedef const _T2 type;
@@ -546,13 +503,13 @@ struct __get_pair<0>
 {
    template <class _T1, class _T2>
    static
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+    _LIBCPP_INLINE_VISIBILITY
    _T1&
    get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}

    template <class _T1, class _T2>
    static
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+    _LIBCPP_INLINE_VISIBILITY
    const _T1&
    get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}

@@ -560,7 +517,7 @@ struct __get_pair<0>

    template <class _T1, class _T2>
    static
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+    _LIBCPP_INLINE_VISIBILITY
    _T1&&
    get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T1>(__p.first);}

@@ -572,13 +529,13 @@ struct __get_pair<1>
 {
    template <class _T1, class _T2>
    static
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+    _LIBCPP_INLINE_VISIBILITY
    _T2&
    get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}

    template <class _T1, class _T2>
    static
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+    _LIBCPP_INLINE_VISIBILITY
    const _T2&
    get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}

@@ -586,7 +543,7 @@ struct __get_pair<1>

    template <class _T1, class _T2>
    static
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+    _LIBCPP_INLINE_VISIBILITY
    _T2&&
    get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T2>(__p.second);}

@@ -594,7 +551,7 @@ struct __get_pair<1>
 };

 template <size_t _Ip, class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+_LIBCPP_INLINE_VISIBILITY inline
 typename tuple_element<_Ip, pair<_T1, _T2> >::type&
 get(pair<_T1, _T2>& __p) _NOEXCEPT
 {
@@ -602,7 +559,7 @@ get(pair<_T1, _T2>& __p) _NOEXCEPT
 }

 template <size_t _Ip, class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+_LIBCPP_INLINE_VISIBILITY inline
 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
 get(const pair<_T1, _T2>& __p) _NOEXCEPT
 {
@@ -612,7 +569,7 @@ get(const pair<_T1, _T2>& __p) _NOEXCEPT
 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

 template <size_t _Ip, class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+_LIBCPP_INLINE_VISIBILITY inline
 typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
 get(pair<_T1, _T2>&& __p) _NOEXCEPT
 {
@@ -621,148 +578,6 @@ get(pair<_T1, _T2>&& __p) _NOEXCEPT

 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES

-#if _LIBCPP_STD_VER > 11
-template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY
-constexpr _T1 & get(pair<_T1, _T2>& __p) _NOEXCEPT
-{
-    return __get_pair<0>::get(__p);
-}
-
-template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY
-constexpr _T1 const & get(pair<_T1, _T2> const& __p) _NOEXCEPT
-{
-    return __get_pair<0>::get(__p);
-}
-
-template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY
-constexpr _T1 && get(pair<_T1, _T2>&& __p) _NOEXCEPT
-{
-    return __get_pair<0>::get(_VSTD::move(__p));
-}
-
-template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY
-constexpr _T1 & get(pair<_T2, _T1>& __p) _NOEXCEPT
-{
-    return __get_pair<1>::get(__p);
-}
-
-template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY
-constexpr _T1 const & get(pair<_T2, _T1> const& __p) _NOEXCEPT
-{
-    return __get_pair<1>::get(__p);
-}
-
-template <class _T1, class _T2>
-inline _LIBCPP_INLINE_VISIBILITY
-constexpr _T1 && get(pair<_T2, _T1>&& __p) _NOEXCEPT
-{
-    return __get_pair<1>::get(_VSTD::move(__p));
-}
-
-#endif
-
-#if _LIBCPP_STD_VER > 11
-
-template<class _Tp, _Tp... _Ip>
-struct _LIBCPP_TYPE_VIS_ONLY integer_sequence
-{
-    typedef _Tp value_type;
-    static_assert( is_integral<_Tp>::value,
-                  "std::integer_sequence can only be instantiated with an integral type" );
-    static
-    _LIBCPP_INLINE_VISIBILITY
-    constexpr
-    size_t
-    size() noexcept { return sizeof...(_Ip); }
-};
-
-template<size_t... _Ip>
-    using index_sequence = integer_sequence<size_t, _Ip...>;
-
-namespace __detail {
-
-template<typename _Tp, size_t ..._Extra> struct __repeat;
-template<typename _Tp, _Tp ..._Np, size_t ..._Extra> struct __repeat<integer_sequence<_Tp, _Np...>, _Extra...> {
-  typedef integer_sequence<_Tp,
-                           _Np...,
-                           sizeof...(_Np) + _Np...,
-                           2 * sizeof...(_Np) + _Np...,
-                           3 * sizeof...(_Np) + _Np...,
-                           4 * sizeof...(_Np) + _Np...,
-                           5 * sizeof...(_Np) + _Np...,
-                           6 * sizeof...(_Np) + _Np...,
-                           7 * sizeof...(_Np) + _Np...,
-                           _Extra...> type;
-};
-
-template<size_t _Np> struct __parity;
-template<size_t _Np> struct __make : __parity<_Np % 8>::template __pmake<_Np> {};
-
-template<> struct __make<0> { typedef integer_sequence<size_t> type; };
-template<> struct __make<1> { typedef integer_sequence<size_t, 0> type; };
-template<> struct __make<2> { typedef integer_sequence<size_t, 0, 1> type; };
-template<> struct __make<3> { typedef integer_sequence<size_t, 0, 1, 2> type; };
-template<> struct __make<4> { typedef integer_sequence<size_t, 0, 1, 2, 3> type; };
-template<> struct __make<5> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4> type; };
-template<> struct __make<6> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4, 5> type; };
-template<> struct __make<7> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4, 5, 6> type; };
-
-template<> struct __parity<0> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type> {}; };
-template<> struct __parity<1> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 1> {}; };
-template<> struct __parity<2> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 2, _Np - 1> {}; };
-template<> struct __parity<3> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 3, _Np - 2, _Np - 1> {}; };
-template<> struct __parity<4> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
-template<> struct __parity<5> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
-template<> struct __parity<6> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 6, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
-template<> struct __parity<7> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 7, _Np - 6, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
-
-template<typename _Tp, typename _Up> struct __convert {
-  template<typename> struct __result;
-  template<_Tp ..._Np> struct __result<integer_sequence<_Tp, _Np...> > { typedef integer_sequence<_Up, _Np...> type; };
-};
-template<typename _Tp> struct __convert<_Tp, _Tp> { template<typename _Up> struct __result { typedef _Up type; }; };
-
-}
-
-template<typename _Tp, _Tp _Np> using __make_integer_sequence_unchecked =
-  typename __detail::__convert<size_t, _Tp>::template __result<typename __detail::__make<_Np>::type>::type;
-
-template <class _Tp, _Tp _Ep>
-struct __make_integer_sequence
-{
-    static_assert(is_integral<_Tp>::value,
-                  "std::make_integer_sequence can only be instantiated with an integral type" );
-    static_assert(0 <= _Ep, "std::make_integer_sequence input shall not be negative");
-    typedef __make_integer_sequence_unchecked<_Tp, _Ep> type;
-};
-
-template<class _Tp, _Tp _Np>
-    using make_integer_sequence = typename __make_integer_sequence<_Tp, _Np>::type;
-
-template<size_t _Np>
-    using make_index_sequence = make_integer_sequence<size_t, _Np>;
-
-template<class... _Tp>
-    using index_sequence_for = make_index_sequence<sizeof...(_Tp)>;
-  
-#endif  // _LIBCPP_STD_VER > 11
-
-#if _LIBCPP_STD_VER > 11
-template<class _T1, class _T2 = _T1>
-inline _LIBCPP_INLINE_VISIBILITY
-_T1 exchange(_T1& __obj, _T2 && __new_value)
-{
-    _T1 __old_value = _VSTD::move(__obj);
-    __obj = _VSTD::forward<_T2>(__new_value);
-    return __old_value;
-}    
-#endif  // _LIBCPP_STD_VER > 11
-
 _LIBCPP_END_NAMESPACE_STD

 #endif  // _LIBCPP_UTILITY
--- a/include/valarray
+++ b/include/valarray
@@ -354,9 +354,9 @@ template <class T> unspecified2 end(const valarray<T>& v);

 _LIBCPP_BEGIN_NAMESPACE_STD

-template<class _Tp> class _LIBCPP_TYPE_VIS_ONLY valarray;
+template<class _Tp> class _LIBCPP_TYPE_VIS valarray;

-class _LIBCPP_TYPE_VIS_ONLY slice
+class _LIBCPP_TYPE_VIS slice
 {
    size_t __start_;
    size_t __size_;
@@ -381,11 +381,11 @@ public:
    _LIBCPP_INLINE_VISIBILITY size_t stride() const {return __stride_;}
 };

-template <class _Tp> class _LIBCPP_TYPE_VIS_ONLY slice_array;
+template <class _Tp> class _LIBCPP_TYPE_VIS slice_array;
 class _LIBCPP_TYPE_VIS gslice;
-template <class _Tp> class _LIBCPP_TYPE_VIS_ONLY gslice_array;
-template <class _Tp> class _LIBCPP_TYPE_VIS_ONLY mask_array;
-template <class _Tp> class _LIBCPP_TYPE_VIS_ONLY indirect_array;
+template <class _Tp> class _LIBCPP_TYPE_VIS gslice_array;
+template <class _Tp> class _LIBCPP_TYPE_VIS mask_array;
+template <class _Tp> class _LIBCPP_TYPE_VIS indirect_array;

 template <class _Tp>
 _LIBCPP_INLINE_VISIBILITY
@@ -671,7 +671,7 @@ public:
    _LIBCPP_INLINE_VISIBILITY
    size_t size() const {return __size_;}

-    template <class> friend class _LIBCPP_TYPE_VIS_ONLY valarray;
+    template <class> friend class _LIBCPP_TYPE_VIS valarray;
 };

 template <class _ValExpr>
@@ -786,7 +786,7 @@ template<class _Tp>
 struct __is_val_expr<valarray<_Tp> > : true_type {};

 template<class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY valarray
+class _LIBCPP_TYPE_VIS valarray
 {
 public:
    typedef _Tp value_type;
@@ -976,12 +976,12 @@ public:
    void     resize(size_t __n, value_type __x = value_type());

 private:
-    template <class> friend class _LIBCPP_TYPE_VIS_ONLY valarray;
-    template <class> friend class _LIBCPP_TYPE_VIS_ONLY slice_array;
-    template <class> friend class _LIBCPP_TYPE_VIS_ONLY gslice_array;
-    template <class> friend class _LIBCPP_TYPE_VIS_ONLY mask_array;
+    template <class> friend class _LIBCPP_TYPE_VIS valarray;
+    template <class> friend class _LIBCPP_TYPE_VIS slice_array;
+    template <class> friend class _LIBCPP_TYPE_VIS gslice_array;
+    template <class> friend class _LIBCPP_TYPE_VIS mask_array;
    template <class> friend class __mask_expr;
-    template <class> friend class _LIBCPP_TYPE_VIS_ONLY indirect_array;
+    template <class> friend class _LIBCPP_TYPE_VIS indirect_array;
    template <class> friend class __indirect_expr;
    template <class> friend class __val_expr;

@@ -1006,10 +1006,6 @@ private:
    end(const valarray<_Up>& __v);
 };

-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS valarray<size_t>::valarray(size_t))
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS valarray<size_t>::~valarray())
-_LIBCPP_EXTERN_TEMPLATE(_LIBCPP_FUNC_VIS void valarray<size_t>::resize(size_t, size_t))
-
 template <class _Op, class _Tp>
 struct _UnaryOp<_Op, valarray<_Tp> >
 {
@@ -1095,7 +1091,7 @@ struct _BinaryOp<_Op, valarray<_Tp>, valarray<_Tp> >
 // slice_array

 template <class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY slice_array
+class _LIBCPP_TYPE_VIS slice_array
 {
 public:
    typedef _Tp value_type;
@@ -1465,7 +1461,7 @@ private:
 // gslice_array

 template <class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY gslice_array
+class _LIBCPP_TYPE_VIS gslice_array
 {
 public:
    typedef _Tp value_type;
@@ -1794,7 +1790,7 @@ gslice_array<_Tp>::operator=(const value_type& __x) const
 // mask_array

 template <class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY mask_array
+class _LIBCPP_TYPE_VIS mask_array
 {
 public:
    typedef _Tp value_type;
@@ -2138,7 +2134,7 @@ public:
 // indirect_array

 template <class _Tp>
-class _LIBCPP_TYPE_VIS_ONLY indirect_array
+class _LIBCPP_TYPE_VIS indirect_array
 {
 public:
    typedef _Tp value_type;
@@ -2489,7 +2485,7 @@ public:
    _LIBCPP_INLINE_VISIBILITY
    size_t size() const {return __1d_.size();}

-    template <class> friend class _LIBCPP_TYPE_VIS_ONLY valarray;
+    template <class> friend class _LIBCPP_TYPE_VIS valarray;
 };

 template<class _ValExpr>
@@ -2628,7 +2624,7 @@ public:
 };

 template<class _ValExpr>
-__val_expr<_ValExpr>::operator valarray<__val_expr::result_type>() const
+__val_expr<_ValExpr>::operator valarray<result_type>() const
 {
    valarray<result_type> __r;
    size_t __n = __expr_.size();
@@ -4774,6 +4770,10 @@ end(const valarray<_Tp>& __v)
    return __v.__end_;
 }

+_LIBCPP_EXTERN_TEMPLATE(valarray<size_t>::valarray(size_t))
+_LIBCPP_EXTERN_TEMPLATE(valarray<size_t>::~valarray())
+_LIBCPP_EXTERN_TEMPLATE(void valarray<size_t>::resize(size_t, size_t))
+
 _LIBCPP_END_NAMESPACE_STD

 #endif  // _LIBCPP_VALARRAY
--- a/include/vector
+++ b/include/vector
@@ -38,7 +38,6 @@ public:
        noexcept(is_nothrow_default_constructible<allocator_type>::value);
    explicit vector(const allocator_type&);
    explicit vector(size_type n);
-    explicit vector(size_type n, const allocator_type&); // C++14
    vector(size_type n, const value_type& value, const allocator_type& = allocator_type());
    template <class InputIterator>
        vector(InputIterator first, InputIterator last, const allocator_type& = allocator_type());
@@ -162,8 +161,7 @@ public:
    vector()
        noexcept(is_nothrow_default_constructible<allocator_type>::value);
    explicit vector(const allocator_type&);
-    explicit vector(size_type n, const allocator_type& a = allocator_type()); // C++14
-    vector(size_type n, const value_type& value, const allocator_type& = allocator_type());
+    explicit vector(size_type n, const value_type& value = value_type(), const allocator_type& = allocator_type());
    template <class InputIterator>
        vector(InputIterator first, InputIterator last, const allocator_type& = allocator_type());
    vector(const vector& x);
@@ -218,10 +216,8 @@ public:
    const_reference back() const;

    void push_back(const value_type& x);
-    template <class... Args> void emplace_back(Args&&... args);  // C++14
    void pop_back();

-    template <class... Args> iterator emplace(const_iterator position, Args&&... args);  // C++14
    iterator insert(const_iterator position, const value_type& x);
    iterator insert(const_iterator position, size_type n, const value_type& x);
    template <class InputIterator>
@@ -276,12 +272,6 @@ void swap(vector<T,Allocator>& x, vector<T,Allocator>& y)

 #include <__undef_min_max>

-#ifdef _LIBCPP_DEBUG
-#   include <__debug>
-#else
-#   define _LIBCPP_ASSERT(x, m) ((void)0)
-#endif
-
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
 #endif
@@ -319,14 +309,14 @@ __vector_base_common<__b>::__throw_out_of_range() const
 #endif
 }

-#ifdef _LIBCPP_MSVC
+#ifdef _MSC_VER
 #pragma warning( push )
 #pragma warning( disable: 4231 )
-#endif // _LIBCPP_MSVC
-_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_TYPE_VIS __vector_base_common<true>)
-#ifdef _LIBCPP_MSVC
+#endif // _MSC_VER
+_LIBCPP_EXTERN_TEMPLATE(class __vector_base_common<true>)
+#ifdef _MSC_VER
 #pragma warning( pop )
-#endif // _LIBCPP_MSVC
+#endif // _MSC_VER

 template <class _Tp, class _Allocator>
 class __vector_base
@@ -375,7 +365,12 @@ protected:
        {return static_cast<size_type>(__end_cap() - __begin_);}

    _LIBCPP_INLINE_VISIBILITY
-    void __destruct_at_end(pointer __new_last) _NOEXCEPT;
+    void __destruct_at_end(const_pointer __new_last) _NOEXCEPT
+        {__destruct_at_end(__new_last, false_type());}
+    _LIBCPP_INLINE_VISIBILITY
+    void __destruct_at_end(const_pointer __new_last, false_type) _NOEXCEPT;
+    _LIBCPP_INLINE_VISIBILITY
+    void __destruct_at_end(const_pointer __new_last, true_type) _NOEXCEPT;

    _LIBCPP_INLINE_VISIBILITY
    void __copy_assign_alloc(const __vector_base& __c)
@@ -440,37 +435,45 @@ private:
 };

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
-__vector_base<_Tp, _Allocator>::__destruct_at_end(pointer __new_last) _NOEXCEPT
+__vector_base<_Tp, _Allocator>::__destruct_at_end(const_pointer __new_last, false_type) _NOEXCEPT
 {
    while (__new_last != __end_)
-        __alloc_traits::destroy(__alloc(), _VSTD::__to_raw_pointer(--__end_));
+        __alloc_traits::destroy(__alloc(), const_cast<pointer>(--__end_));
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
+void
+__vector_base<_Tp, _Allocator>::__destruct_at_end(const_pointer __new_last, true_type) _NOEXCEPT
+{
+    __end_ = const_cast<pointer>(__new_last);
+}
+
+template <class _Tp, class _Allocator>
+_LIBCPP_INLINE_VISIBILITY inline
 __vector_base<_Tp, _Allocator>::__vector_base()
        _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
-    : __begin_(nullptr),
-      __end_(nullptr),
-      __end_cap_(nullptr)
+    : __begin_(0),
+      __end_(0),
+      __end_cap_(0)
 {
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 __vector_base<_Tp, _Allocator>::__vector_base(const allocator_type& __a)
-    : __begin_(nullptr),
-      __end_(nullptr),
-      __end_cap_(nullptr, __a)
+    : __begin_(0),
+      __end_(0),
+      __end_cap_(0, __a)
 {
 }

 template <class _Tp, class _Allocator>
 __vector_base<_Tp, _Allocator>::~__vector_base()
 {
-    if (__begin_ != nullptr)
+    if (__begin_ != 0)
    {
        clear();
        __alloc_traits::deallocate(__alloc(), __begin_, capacity());
@@ -478,7 +481,7 @@ __vector_base<_Tp, _Allocator>::~__vector_base()
 }

 template <class _Tp, class _Allocator = allocator<_Tp> >
-class _LIBCPP_TYPE_VIS_ONLY vector
+class _LIBCPP_TYPE_VIS vector
    : private __vector_base<_Tp, _Allocator>
 {
 private:
@@ -518,19 +521,15 @@ public:
 #endif
    }
    explicit vector(size_type __n);
-#if _LIBCPP_STD_VER > 11
-    explicit vector(size_type __n, const allocator_type& __a);
-#endif
    vector(size_type __n, const_reference __x);
    vector(size_type __n, const_reference __x, const allocator_type& __a);
    template <class _InputIterator>
-        vector(_InputIterator __first,
+        vector(_InputIterator __first, _InputIterator __last,
               typename enable_if<__is_input_iterator  <_InputIterator>::value &&
                                 !__is_forward_iterator<_InputIterator>::value &&
                                 is_constructible<
                                    value_type,
-                                    typename iterator_traits<_InputIterator>::reference>::value,
-                                 _InputIterator>::type __last);
+                                    typename iterator_traits<_InputIterator>::reference>::value>::type* = 0);
    template <class _InputIterator>
        vector(_InputIterator __first, _InputIterator __last, const allocator_type& __a,
               typename enable_if<__is_input_iterator  <_InputIterator>::value &&
@@ -539,12 +538,11 @@ public:
                                    value_type,
                                    typename iterator_traits<_InputIterator>::reference>::value>::type* = 0);
    template <class _ForwardIterator>
-        vector(_ForwardIterator __first,
+        vector(_ForwardIterator __first, _ForwardIterator __last,
               typename enable_if<__is_forward_iterator<_ForwardIterator>::value &&
                                 is_constructible<
                                    value_type,
-                                    typename iterator_traits<_ForwardIterator>::reference>::value,
-                                 _ForwardIterator>::type __last);
+                                    typename iterator_traits<_ForwardIterator>::reference>::value>::type* = 0);
    template <class _ForwardIterator>
        vector(_ForwardIterator __first, _ForwardIterator __last, const allocator_type& __a,
               typename enable_if<__is_forward_iterator<_ForwardIterator>::value &&
@@ -799,7 +797,7 @@ private:
        _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value);
    void __move_assign(vector& __c, false_type);
    _LIBCPP_INLINE_VISIBILITY
-    void __destruct_at_end(pointer __new_last) _NOEXCEPT
+    void __destruct_at_end(const_pointer __new_last) _NOEXCEPT
    {
 #if _LIBCPP_DEBUG_LEVEL >= 2
        __c_node* __c = __get_db()->__find_c_and_lock(this);
@@ -880,11 +878,11 @@ template <class _Tp, class _Allocator>
 void
 vector<_Tp, _Allocator>::deallocate() _NOEXCEPT
 {
-    if (this->__begin_ != nullptr)
+    if (this->__begin_ != 0)
    {
        clear();
        __alloc_traits::deallocate(this->__alloc(), this->__begin_, capacity());
-        this->__begin_ = this->__end_ = this->__end_cap() = nullptr;
+        this->__begin_ = this->__end_ = this->__end_cap() = 0;
    }
 }

@@ -897,7 +895,7 @@ vector<_Tp, _Allocator>::max_size() const _NOEXCEPT

 //  Precondition:  __new_size > capacity()
 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 typename vector<_Tp, _Allocator>::size_type
 vector<_Tp, _Allocator>::__recommend(size_type __new_size) const
 {
@@ -935,7 +933,7 @@ vector<_Tp, _Allocator>::__construct_at_end(size_type __n)
 //  Postcondition:  size() == old size() + __n
 //  Postcondition:  [i] == __x for all i in [size() - __n, __n)
 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
 vector<_Tp, _Allocator>::__construct_at_end(size_type __n, const_reference __x)
 {
@@ -1029,22 +1027,6 @@ vector<_Tp, _Allocator>::vector(size_type __n)
    }
 }

-#if _LIBCPP_STD_VER > 11
-template <class _Tp, class _Allocator>
-vector<_Tp, _Allocator>::vector(size_type __n, const allocator_type& __a)
-    : __base(__a)
-{
-#if _LIBCPP_DEBUG_LEVEL >= 2
-    __get_db()->__insert_c(this);
-#endif
-    if (__n > 0)
-    {
-        allocate(__n);
-        __construct_at_end(__n);
-    }
-}
-#endif
-
 template <class _Tp, class _Allocator>
 vector<_Tp, _Allocator>::vector(size_type __n, const_reference __x)
 {
@@ -1074,13 +1056,12 @@ vector<_Tp, _Allocator>::vector(size_type __n, const_reference __x, const alloca

 template <class _Tp, class _Allocator>
 template <class _InputIterator>
-vector<_Tp, _Allocator>::vector(_InputIterator __first,
+vector<_Tp, _Allocator>::vector(_InputIterator __first, _InputIterator __last,
       typename enable_if<__is_input_iterator  <_InputIterator>::value &&
                         !__is_forward_iterator<_InputIterator>::value &&
                         is_constructible<
                            value_type,
-                            typename iterator_traits<_InputIterator>::reference>::value,
-                          _InputIterator>::type __last)
+                            typename iterator_traits<_InputIterator>::reference>::value>::type*)
 {
 #if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__insert_c(this);
@@ -1108,12 +1089,11 @@ vector<_Tp, _Allocator>::vector(_InputIterator __first, _InputIterator __last, c

 template <class _Tp, class _Allocator>
 template <class _ForwardIterator>
-vector<_Tp, _Allocator>::vector(_ForwardIterator __first,
+vector<_Tp, _Allocator>::vector(_ForwardIterator __first, _ForwardIterator __last,
                                typename enable_if<__is_forward_iterator<_ForwardIterator>::value &&
                                is_constructible<
                                   value_type,
-                                   typename iterator_traits<_ForwardIterator>::reference>::value,
-                                                   _ForwardIterator>::type __last)
+                                   typename iterator_traits<_ForwardIterator>::reference>::value>::type*)
 {
 #if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__insert_c(this);
@@ -1179,7 +1159,7 @@ vector<_Tp, _Allocator>::vector(const vector& __x, const allocator_type& __a)
 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 vector<_Tp, _Allocator>::vector(vector&& __x)
        _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value)
    : __base(_VSTD::move(__x.__alloc()))
@@ -1191,11 +1171,11 @@ vector<_Tp, _Allocator>::vector(vector&& __x)
    this->__begin_ = __x.__begin_;
    this->__end_ = __x.__end_;
    this->__end_cap() = __x.__end_cap();
-    __x.__begin_ = __x.__end_ = __x.__end_cap() = nullptr;
+    __x.__begin_ = __x.__end_ = __x.__end_cap() = 0;
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 vector<_Tp, _Allocator>::vector(vector&& __x, const allocator_type& __a)
    : __base(__a)
 {
@@ -1222,7 +1202,7 @@ vector<_Tp, _Allocator>::vector(vector&& __x, const allocator_type& __a)
 #ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 vector<_Tp, _Allocator>::vector(initializer_list<value_type> __il)
 {
 #if _LIBCPP_DEBUG_LEVEL >= 2
@@ -1236,7 +1216,7 @@ vector<_Tp, _Allocator>::vector(initializer_list<value_type> __il)
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 vector<_Tp, _Allocator>::vector(initializer_list<value_type> __il, const allocator_type& __a)
    : __base(__a)
 {
@@ -1253,7 +1233,7 @@ vector<_Tp, _Allocator>::vector(initializer_list<value_type> __il, const allocat
 #endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 vector<_Tp, _Allocator>&
 vector<_Tp, _Allocator>::operator=(vector&& __x)
        _NOEXCEPT_(
@@ -1297,7 +1277,7 @@ vector<_Tp, _Allocator>::__move_assign(vector& __c, true_type)
 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 vector<_Tp, _Allocator>&
 vector<_Tp, _Allocator>::operator=(const vector& __x)
 {
@@ -1386,7 +1366,7 @@ vector<_Tp, _Allocator>::assign(size_type __n, const_reference __u)
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 typename vector<_Tp, _Allocator>::iterator
 vector<_Tp, _Allocator>::__make_iter(pointer __p) _NOEXCEPT
 {
@@ -1398,7 +1378,7 @@ vector<_Tp, _Allocator>::__make_iter(pointer __p) _NOEXCEPT
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 typename vector<_Tp, _Allocator>::const_iterator
 vector<_Tp, _Allocator>::__make_iter(const_pointer __p) const _NOEXCEPT
 {
@@ -1410,7 +1390,7 @@ vector<_Tp, _Allocator>::__make_iter(const_pointer __p) const _NOEXCEPT
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 typename vector<_Tp, _Allocator>::iterator
 vector<_Tp, _Allocator>::begin() _NOEXCEPT
 {
@@ -1418,7 +1398,7 @@ vector<_Tp, _Allocator>::begin() _NOEXCEPT
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 typename vector<_Tp, _Allocator>::const_iterator
 vector<_Tp, _Allocator>::begin() const _NOEXCEPT
 {
@@ -1426,7 +1406,7 @@ vector<_Tp, _Allocator>::begin() const _NOEXCEPT
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 typename vector<_Tp, _Allocator>::iterator
 vector<_Tp, _Allocator>::end() _NOEXCEPT
 {
@@ -1434,7 +1414,7 @@ vector<_Tp, _Allocator>::end() _NOEXCEPT
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 typename vector<_Tp, _Allocator>::const_iterator
 vector<_Tp, _Allocator>::end() const _NOEXCEPT
 {
@@ -1442,7 +1422,7 @@ vector<_Tp, _Allocator>::end() const _NOEXCEPT
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 typename vector<_Tp, _Allocator>::reference
 vector<_Tp, _Allocator>::operator[](size_type __n)
 {
@@ -1451,7 +1431,7 @@ vector<_Tp, _Allocator>::operator[](size_type __n)
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 typename vector<_Tp, _Allocator>::const_reference
 vector<_Tp, _Allocator>::operator[](size_type __n) const
 {
@@ -1529,7 +1509,7 @@ vector<_Tp, _Allocator>::__push_back_slow_path(_Up& __x)
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
 vector<_Tp, _Allocator>::push_back(const_reference __x)
 {
@@ -1546,7 +1526,7 @@ vector<_Tp, _Allocator>::push_back(const_reference __x)
 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
 vector<_Tp, _Allocator>::push_back(value_type&& __x)
 {
@@ -1578,7 +1558,7 @@ vector<_Tp, _Allocator>::__emplace_back_slow_path(_Args&&... __args)

 template <class _Tp, class _Allocator>
 template <class... _Args>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
 vector<_Tp, _Allocator>::emplace_back(_Args&&... __args)
 {
@@ -1597,7 +1577,7 @@ vector<_Tp, _Allocator>::emplace_back(_Args&&... __args)
 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
 vector<_Tp, _Allocator>::pop_back()
 {
@@ -1606,7 +1586,7 @@ vector<_Tp, _Allocator>::pop_back()
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 typename vector<_Tp, _Allocator>::iterator
 vector<_Tp, _Allocator>::erase(const_iterator __position)
 {
@@ -1617,8 +1597,7 @@ vector<_Tp, _Allocator>::erase(const_iterator __position)
 #endif
    _LIBCPP_ASSERT(__position != end(),
        "vector::erase(iterator) called with a non-dereferenceable iterator");
-    difference_type __ps = __position - cbegin();
-    pointer __p = this->__begin_ + __ps;
+    pointer __p = const_cast<pointer>(&*__position);
    iterator __r = __make_iter(__p);
    this->__destruct_at_end(_VSTD::move(__p + 1, this->__end_, __p));
    return __r;
@@ -1964,9 +1943,9 @@ template <class _Tp, class _Allocator>
 bool
 vector<_Tp, _Allocator>::__invariants() const
 {
-    if (this->__begin_ == nullptr)
+    if (this->__begin_ == 0)
    {
-        if (this->__end_ != nullptr || this->__end_cap() != nullptr)
+        if (this->__end_ != 0 || this->__end_cap() != 0)
            return false;
    }
    else
@@ -2016,7 +1995,7 @@ vector<_Tp, _Allocator>::__subscriptable(const const_iterator* __i, ptrdiff_t __
 #endif  // _LIBCPP_DEBUG_LEVEL >= 2

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
 vector<_Tp, _Allocator>::__invalidate_all_iterators()
 {
@@ -2038,7 +2017,7 @@ struct __has_storage_type<vector<bool, _Allocator> >
 };

 template <class _Allocator>
-class _LIBCPP_TYPE_VIS_ONLY vector<bool, _Allocator>
+class _LIBCPP_TYPE_VIS vector<bool, _Allocator>
    : private __vector_base_common<true>
 {
 public:
@@ -2051,8 +2030,21 @@ public:
    typedef size_type __storage_type;
    typedef __bit_iterator<vector, false>            pointer;
    typedef __bit_iterator<vector, true>             const_pointer;
+#ifdef _LIBCPP_DEBUG
+    typedef __debug_iter<vector, pointer>            iterator;
+    typedef __debug_iter<vector, const_pointer>      const_iterator;
+
+    friend class __debug_iter<vector, pointer>;
+    friend class __debug_iter<vector, const_pointer>;
+
+    pair<iterator*, const_iterator*> __iterator_list_;
+
+    _LIBCPP_INLINE_VISIBILITY iterator*&       __get_iterator_list(iterator*)       {return __iterator_list_.first;}
+    _LIBCPP_INLINE_VISIBILITY const_iterator*& __get_iterator_list(const_iterator*) {return __iterator_list_.second;}
+#else  // _LIBCPP_DEBUG
    typedef pointer                                  iterator;
    typedef const_pointer                            const_iterator;
+#endif  // _LIBCPP_DEBUG
    typedef _VSTD::reverse_iterator<iterator>         reverse_iterator;
    typedef _VSTD::reverse_iterator<const_iterator>   const_reverse_iterator;

@@ -2104,9 +2096,6 @@ public:
    _LIBCPP_INLINE_VISIBILITY explicit vector(const allocator_type& __a);
    ~vector();
    explicit vector(size_type __n);
-#if _LIBCPP_STD_VER > 11
-    explicit vector(size_type __n, const allocator_type& __a);
-#endif
    vector(size_type __n, const value_type& __v);
    vector(size_type __n, const value_type& __v, const allocator_type& __a);
    template <class _InputIterator>
@@ -2238,20 +2227,8 @@ public:
    _LIBCPP_INLINE_VISIBILITY const_reference back()  const {return __make_ref(__size_ - 1);}

    void push_back(const value_type& __x);
-#if _LIBCPP_STD_VER > 11
-    template <class... _Args>
-    _LIBCPP_INLINE_VISIBILITY void emplace_back(_Args&&... __args)
-        { push_back ( value_type ( _VSTD::forward<_Args>(__args)... )); }
-#endif
-
    _LIBCPP_INLINE_VISIBILITY void pop_back() {--__size_;}

-#if _LIBCPP_STD_VER > 11
-    template <class... _Args>
-   _LIBCPP_INLINE_VISIBILITY iterator emplace(const_iterator position, _Args&&... __args)
-        { return insert ( position, value_type ( _VSTD::forward<_Args>(__args)... )); }
-#endif
-
    iterator insert(const_iterator __position, const value_type& __x);
    iterator insert(const_iterator __position, size_type __n, const value_type& __x);
    iterator insert(const_iterator __position, size_type __n, const_reference __x);
@@ -2296,7 +2273,7 @@ private:
    void allocate(size_type __n);
    void deallocate() _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
-    static size_type __align_it(size_type __new_size) _NOEXCEPT
+    static size_type __align(size_type __new_size) _NOEXCEPT
        {return __new_size + (__bits_per_word-1) & ~(__bits_per_word-1);};
    _LIBCPP_INLINE_VISIBILITY  size_type __recommend(size_type __new_size) const;
    _LIBCPP_INLINE_VISIBILITY void __construct_at_end(size_type __n, bool __x);
@@ -2314,6 +2291,14 @@ private:
    _LIBCPP_INLINE_VISIBILITY
    const_reference __make_ref(size_type __pos) const _NOEXCEPT
        {return const_reference(__begin_ + __pos / __bits_per_word, __storage_type(1) << __pos % __bits_per_word);}
+#ifdef _LIBCPP_DEBUG
+    _LIBCPP_INLINE_VISIBILITY iterator __make_iter(size_type __pos)
+        {return iterator(this, pointer(__begin_ + __pos / __bits_per_word, static_cast<unsigned>(__pos % __bits_per_word)));}
+    _LIBCPP_INLINE_VISIBILITY const_iterator __make_iter(size_type __pos) const
+        {return const_iterator(this, const_pointer(__begin_ + __pos / __bits_per_word, static_cast<unsigned>(__pos % __bits_per_word)));}
+    _LIBCPP_INLINE_VISIBILITY iterator __const_iterator_cast(const_iterator __p)
+        {return iterator(this, pointer(const_cast<__storage_pointer>(__p.base().__seg_), __p.base().__ctz_));}
+#else  // _LIBCPP_DEBUG
    _LIBCPP_INLINE_VISIBILITY
    iterator __make_iter(size_type __pos) _NOEXCEPT
        {return iterator(__begin_ + __pos / __bits_per_word, static_cast<unsigned>(__pos % __bits_per_word));}
@@ -2322,7 +2307,8 @@ private:
        {return const_iterator(__begin_ + __pos / __bits_per_word, static_cast<unsigned>(__pos % __bits_per_word));}
    _LIBCPP_INLINE_VISIBILITY
    iterator __const_iterator_cast(const_iterator __p) _NOEXCEPT
-        {return begin() + (__p - cbegin());}
+        {return iterator(const_cast<__storage_pointer>(__p.__seg_), __p.__ctz_);}
+#endif  // _LIBCPP_DEBUG

    _LIBCPP_INLINE_VISIBILITY
    void __copy_assign_alloc(const vector& __v)
@@ -2389,14 +2375,20 @@ private:
    friend class __bit_iterator<vector, false>;
    friend class __bit_iterator<vector, true>;
    friend struct __bit_array<vector>;
-    friend struct _LIBCPP_TYPE_VIS_ONLY hash<vector>;
+    friend struct _LIBCPP_TYPE_VIS hash<vector>;
 };

 template <class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+#ifndef _LIBCPP_DEBUG
+_LIBCPP_INLINE_VISIBILITY inline
+#endif
 void
 vector<bool, _Allocator>::__invalidate_all_iterators()
 {
+#ifdef _LIBCPP_DEBUG
+    iterator::__remove_all(this);
+    const_iterator::__remove_all(this);
+#endif  // _LIBCPP_DEBUG
 }

 //  Allocate space for __n objects
@@ -2422,11 +2414,11 @@ template <class _Allocator>
 void
 vector<bool, _Allocator>::deallocate() _NOEXCEPT
 {
-    if (this->__begin_ != nullptr)
+    if (this->__begin_ != 0)
    {
        __storage_traits::deallocate(this->__alloc(), this->__begin_, __cap());
        __invalidate_all_iterators();
-        this->__begin_ = nullptr;
+        this->__begin_ = 0;
        this->__size_ = this->__cap() = 0;
    }
 }
@@ -2444,7 +2436,7 @@ vector<bool, _Allocator>::max_size() const _NOEXCEPT

 //  Precondition:  __new_size > capacity()
 template <class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 typename vector<bool, _Allocator>::size_type
 vector<bool, _Allocator>::__recommend(size_type __new_size) const
 {
@@ -2454,7 +2446,7 @@ vector<bool, _Allocator>::__recommend(size_type __new_size) const
    const size_type __cap = capacity();
    if (__cap >= __ms / 2)
        return __ms;
-    return _VSTD::max(2*__cap, __align_it(__new_size));
+    return _VSTD::max(2*__cap, __align(__new_size));
 }

 //  Default constructs __n objects starting at __end_
@@ -2462,7 +2454,7 @@ vector<bool, _Allocator>::__recommend(size_type __new_size) const
 //  Precondition:  size() + __n <= capacity()
 //  Postcondition:  size() == size() + __n
 template <class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
 vector<bool, _Allocator>::__construct_at_end(size_type __n, bool __x)
 {
@@ -2486,19 +2478,19 @@ vector<bool, _Allocator>::__construct_at_end(_ForwardIterator __first, _ForwardI
 }

 template <class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 vector<bool, _Allocator>::vector()
        _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
-    : __begin_(nullptr),
+    : __begin_(0),
      __size_(0),
      __cap_alloc_(0)
 {
 }

 template <class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 vector<bool, _Allocator>::vector(const allocator_type& __a)
-    : __begin_(nullptr),
+    : __begin_(0),
      __size_(0),
      __cap_alloc_(0, static_cast<__storage_allocator>(__a))
 {
@@ -2506,7 +2498,7 @@ vector<bool, _Allocator>::vector(const allocator_type& __a)

 template <class _Allocator>
 vector<bool, _Allocator>::vector(size_type __n)
-    : __begin_(nullptr),
+    : __begin_(0),
      __size_(0),
      __cap_alloc_(0)
 {
@@ -2517,24 +2509,9 @@ vector<bool, _Allocator>::vector(size_type __n)
    }
 }

-#if _LIBCPP_STD_VER > 11
-template <class _Allocator>
-vector<bool, _Allocator>::vector(size_type __n, const allocator_type& __a)
-    : __begin_(nullptr),
-      __size_(0),
-      __cap_alloc_(0, static_cast<__storage_allocator>(__a))
-{
-    if (__n > 0)
-    {
-        allocate(__n);
-        __construct_at_end(__n, false);
-    }
-}
-#endif
-
 template <class _Allocator>
 vector<bool, _Allocator>::vector(size_type __n, const value_type& __x)
-    : __begin_(nullptr),
+    : __begin_(0),
      __size_(0),
      __cap_alloc_(0)
 {
@@ -2547,7 +2524,7 @@ vector<bool, _Allocator>::vector(size_type __n, const value_type& __x)

 template <class _Allocator>
 vector<bool, _Allocator>::vector(size_type __n, const value_type& __x, const allocator_type& __a)
-    : __begin_(nullptr),
+    : __begin_(0),
      __size_(0),
      __cap_alloc_(0, static_cast<__storage_allocator>(__a))
 {
@@ -2563,7 +2540,7 @@ template <class _InputIterator>
 vector<bool, _Allocator>::vector(_InputIterator __first, _InputIterator __last,
       typename enable_if<__is_input_iterator  <_InputIterator>::value &&
                         !__is_forward_iterator<_InputIterator>::value>::type*)
-    : __begin_(nullptr),
+    : __begin_(0),
      __size_(0),
      __cap_alloc_(0)
 {
@@ -2577,7 +2554,7 @@ vector<bool, _Allocator>::vector(_InputIterator __first, _InputIterator __last,
    }
    catch (...)
    {
-        if (__begin_ != nullptr)
+        if (__begin_ != 0)
            __storage_traits::deallocate(__alloc(), __begin_, __cap());
        __invalidate_all_iterators();
        throw;
@@ -2590,7 +2567,7 @@ template <class _InputIterator>
 vector<bool, _Allocator>::vector(_InputIterator __first, _InputIterator __last, const allocator_type& __a,
       typename enable_if<__is_input_iterator  <_InputIterator>::value &&
                         !__is_forward_iterator<_InputIterator>::value>::type*)
-    : __begin_(nullptr),
+    : __begin_(0),
      __size_(0),
      __cap_alloc_(0, static_cast<__storage_allocator>(__a))
 {
@@ -2604,7 +2581,7 @@ vector<bool, _Allocator>::vector(_InputIterator __first, _InputIterator __last,
    }
    catch (...)
    {
-        if (__begin_ != nullptr)
+        if (__begin_ != 0)
            __storage_traits::deallocate(__alloc(), __begin_, __cap());
        __invalidate_all_iterators();
        throw;
@@ -2616,7 +2593,7 @@ template <class _Allocator>
 template <class _ForwardIterator>
 vector<bool, _Allocator>::vector(_ForwardIterator __first, _ForwardIterator __last,
                                typename enable_if<__is_forward_iterator<_ForwardIterator>::value>::type*)
-    : __begin_(nullptr),
+    : __begin_(0),
      __size_(0),
      __cap_alloc_(0)
 {
@@ -2632,7 +2609,7 @@ template <class _Allocator>
 template <class _ForwardIterator>
 vector<bool, _Allocator>::vector(_ForwardIterator __first, _ForwardIterator __last, const allocator_type& __a,
                                typename enable_if<__is_forward_iterator<_ForwardIterator>::value>::type*)
-    : __begin_(nullptr),
+    : __begin_(0),
      __size_(0),
      __cap_alloc_(0, static_cast<__storage_allocator>(__a))
 {
@@ -2648,7 +2625,7 @@ vector<bool, _Allocator>::vector(_ForwardIterator __first, _ForwardIterator __la

 template <class _Allocator>
 vector<bool, _Allocator>::vector(initializer_list<value_type> __il)
-    : __begin_(nullptr),
+    : __begin_(0),
      __size_(0),
      __cap_alloc_(0)
 {
@@ -2662,7 +2639,7 @@ vector<bool, _Allocator>::vector(initializer_list<value_type> __il)

 template <class _Allocator>
 vector<bool, _Allocator>::vector(initializer_list<value_type> __il, const allocator_type& __a)
-    : __begin_(nullptr),
+    : __begin_(0),
      __size_(0),
      __cap_alloc_(0, static_cast<__storage_allocator>(__a))
 {
@@ -2679,14 +2656,16 @@ vector<bool, _Allocator>::vector(initializer_list<value_type> __il, const alloca
 template <class _Allocator>
 vector<bool, _Allocator>::~vector()
 {
-    if (__begin_ != nullptr)
+    if (__begin_ != 0)
        __storage_traits::deallocate(__alloc(), __begin_, __cap());
+#ifdef _LIBCPP_DEBUG
    __invalidate_all_iterators();
+#endif
 }

 template <class _Allocator>
 vector<bool, _Allocator>::vector(const vector& __v)
-    : __begin_(nullptr),
+    : __begin_(0),
      __size_(0),
      __cap_alloc_(0, __storage_traits::select_on_container_copy_construction(__v.__alloc()))
 {
@@ -2699,7 +2678,7 @@ vector<bool, _Allocator>::vector(const vector& __v)

 template <class _Allocator>
 vector<bool, _Allocator>::vector(const vector& __v, const allocator_type& __a)
-    : __begin_(nullptr),
+    : __begin_(0),
      __size_(0),
      __cap_alloc_(0, __a)
 {
@@ -2734,21 +2713,21 @@ vector<bool, _Allocator>::operator=(const vector& __v)
 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

 template <class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 vector<bool, _Allocator>::vector(vector&& __v)
        _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value)
    : __begin_(__v.__begin_),
      __size_(__v.__size_),
      __cap_alloc_(__v.__cap_alloc_)
 {
-    __v.__begin_ = nullptr;
+    __v.__begin_ = 0;
    __v.__size_ = 0;
    __v.__cap() = 0;
 }

 template <class _Allocator>
 vector<bool, _Allocator>::vector(vector&& __v, const allocator_type& __a)
-    : __begin_(nullptr),
+    : __begin_(0),
      __size_(0),
      __cap_alloc_(0, __a)
 {
@@ -2768,7 +2747,7 @@ vector<bool, _Allocator>::vector(vector&& __v, const allocator_type& __a)
 }

 template <class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 vector<bool, _Allocator>&
 vector<bool, _Allocator>::operator=(vector&& __v)
        _NOEXCEPT_(
@@ -3055,7 +3034,7 @@ vector<bool, _Allocator>::insert(const_iterator __position, _ForwardIterator __f
 }

 template <class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 typename vector<bool, _Allocator>::iterator
 vector<bool, _Allocator>::erase(const_iterator __position)
 {
@@ -3086,6 +3065,10 @@ vector<bool, _Allocator>::swap(vector& __x)
    _VSTD::swap(this->__size_, __x.__size_);
    _VSTD::swap(this->__cap(), __x.__cap());
    __swap_alloc(this->__alloc(), __x.__alloc());
+#ifdef _LIBCPP_DEBUG
+    iterator::swap(this, &__x);
+    const_iterator::swap(this, &__x);
+#endif  // _LIBCPP_DEBUG
 }

 template <class _Allocator>
@@ -3140,7 +3123,7 @@ template <class _Allocator>
 bool
 vector<bool, _Allocator>::__invariants() const
 {
-    if (this->__begin_ == nullptr)
+    if (this->__begin_ == 0)
    {
        if (this->__size_ != 0 || this->__cap() != 0)
            return false;
@@ -3175,7 +3158,7 @@ vector<bool, _Allocator>::__hash_code() const _NOEXCEPT
 }

 template <class _Allocator>
-struct _LIBCPP_TYPE_VIS_ONLY hash<vector<bool, _Allocator> >
+struct _LIBCPP_TYPE_VIS hash<vector<bool, _Allocator> >
    : public unary_function<vector<bool, _Allocator>, size_t>
 {
    _LIBCPP_INLINE_VISIBILITY
@@ -3184,7 +3167,7 @@ struct _LIBCPP_TYPE_VIS_ONLY hash<vector<bool, _Allocator> >
 };

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 bool
 operator==(const vector<_Tp, _Allocator>& __x, const vector<_Tp, _Allocator>& __y)
 {
@@ -3193,7 +3176,7 @@ operator==(const vector<_Tp, _Allocator>& __x, const vector<_Tp, _Allocator>& __
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 bool
 operator!=(const vector<_Tp, _Allocator>& __x, const vector<_Tp, _Allocator>& __y)
 {
@@ -3201,7 +3184,7 @@ operator!=(const vector<_Tp, _Allocator>& __x, const vector<_Tp, _Allocator>& __
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 bool
 operator< (const vector<_Tp, _Allocator>& __x, const vector<_Tp, _Allocator>& __y)
 {
@@ -3209,7 +3192,7 @@ operator< (const vector<_Tp, _Allocator>& __x, const vector<_Tp, _Allocator>& __
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 bool
 operator> (const vector<_Tp, _Allocator>& __x, const vector<_Tp, _Allocator>& __y)
 {
@@ -3217,7 +3200,7 @@ operator> (const vector<_Tp, _Allocator>& __x, const vector<_Tp, _Allocator>& __
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 bool
 operator>=(const vector<_Tp, _Allocator>& __x, const vector<_Tp, _Allocator>& __y)
 {
@@ -3225,7 +3208,7 @@ operator>=(const vector<_Tp, _Allocator>& __x, const vector<_Tp, _Allocator>& __
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 bool
 operator<=(const vector<_Tp, _Allocator>& __x, const vector<_Tp, _Allocator>& __y)
 {
@@ -3233,7 +3216,7 @@ operator<=(const vector<_Tp, _Allocator>& __x, const vector<_Tp, _Allocator>& __
 }

 template <class _Tp, class _Allocator>
-inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY inline
 void
 swap(vector<_Tp, _Allocator>& __x, vector<_Tp, _Allocator>& __y)
    _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -49,43 +49,6 @@ target_link_libraries(cxx ${libraries})
 append_if(compile_flags LIBCXX_HAS_FPIC_FLAG -fPIC)
 append_if(link_flags LIBCXX_HAS_NODEFAULTLIBS_FLAG -nodefaultlibs)

-if ( APPLE )
-  if ( CMAKE_OSX_DEPLOYMENT_TARGET STREQUAL "10.6" )
-    list(APPEND compile_flags "-U__STRICT_ANSI__")
-    list(APPEND link_flags
-      "-compatibility_version 1"
-      "-current_version ${LIBCXX_VERSION}"
-      "-install_name /usr/lib/libc++.1.dylib"
-      "-Wl,-reexport_library,/usr/lib/libc++abi.dylib"
-      "-Wl,-unexported_symbols_list,${CMAKE_CURRENT_SOURCE_DIR}/libc++unexp.exp"
-      "/usr/lib/libSystem.B.dylib")
-  else()
-    if ( ${CMAKE_OSX_SYSROOT} )
-      list(FIND ${CMAKE_OSX_ARCHITECTURES} "armv7" OSX_HAS_ARMV7)
-      if (OSX_HAS_ARMV7)
-        set(OSX_RE_EXPORT_LINE
-          "${CMAKE_OSX_SYSROOT}/usr/lib/libc++abi.dylib"
-          "-Wl,-reexported_symbols_list,${CMAKE_CURRENT_SOURCE_DIR}/libc++sjlj-abi.exp")
-      else()
-        set(OSX_RE_EXPORT_LINE
-          "-Wl,-reexport_library,${CMAKE_OSX_SYSROOT}/usr/lib/libc++abi.dylib")
-      endif()
-    else()
-      set (OSX_RE_EXPORT_LINE "/usr/lib/libc++abi.dylib -Wl,-reexported_symbols_list,${CMAKE_CURRENT_SOURCE_DIR}/libc++abi${LIBCXX_LIBCPPABI_VERSION}.exp")
-    endif()
-
-    list(APPEND link_flags
-      "-compatibility_version 1"
-      "-install_name /usr/lib/libc++.1.dylib"
-      "-Wl,-unexported_symbols_list,${CMAKE_CURRENT_SOURCE_DIR}/libc++unexp.exp"
-      "${OSX_RE_EXPORT_LINE}"
-      "-Wl,-force_symbols_not_weak_list,${CMAKE_CURRENT_SOURCE_DIR}/notweak.exp"
-      "-Wl,-force_symbols_weak_list,${CMAKE_CURRENT_SOURCE_DIR}/weak.exp")
-  endif()
-endif()
-
-string(REPLACE ";" " " link_flags "${link_flags}")
-
 set_target_properties(cxx
  PROPERTIES
    COMPILE_FLAGS "${compile_flags}"
@@ -99,3 +62,10 @@ install(TARGETS cxx
  LIBRARY DESTINATION lib
  ARCHIVE DESTINATION lib
  )
+
+install(DIRECTORY ../include/
+  DESTINATION include/c++/v1
+  FILES_MATCHING
+  PATTERN "*"
+  PATTERN ".svn" EXCLUDE
+  )
--- a/lib/buildit
+++ b/lib/buildit
@@ -22,21 +22,22 @@ then
    CC=clang
 fi

-if [ -z "$MACOSX_DEPLOYMENT_TARGET" ]
+if [ -z $MACOSX_DEPLOYMENT_TARGET ]
 then
-    if [ -z "$IPHONEOS_DEPLOYMENT_TARGET" ]
+    if [ -z $IPHONEOS_DEPLOYMENT_TARGET ]
    then
        MACOSX_DEPLOYMENT_TARGET=10.7
    fi
 fi

-if [ -z "$RC_ProjectSourceVersion" ]
+if [ -z $RC_ProjectSourceVersion ]
 then
  RC_ProjectSourceVersion=1
 fi

-EXTRA_FLAGS="-nostdinc++ -std=c++11 -fstrict-aliasing -Wall -Wextra -Wshadow -Wconversion \
-             -Wpadded -Wstrict-aliasing=2 -Wstrict-overflow=4 "
+EXTRA_FLAGS="-std=c++0x -fstrict-aliasing -Wall -Wextra -Wshadow -Wconversion \
+             -Wnewline-eof -Wpadded -Wmissing-prototypes -Wstrict-aliasing=2 \
+             -Wstrict-overflow=4 "

 case $TRIPLE in
  *-apple-*)
@@ -47,7 +48,7 @@ case $TRIPLE in
    SOEXT=dylib
    if [ "$MACOSX_DEPLOYMENT_TARGET" == "10.6" ]
    then
-        EXTRA_FLAGS="-nostdinc++ -std=c++11 -U__STRICT_ANSI__"
+        EXTRA_FLAGS="-std=c++0x -U__STRICT_ANSI__"
        LDSHARED_FLAGS="-o libc++.1.dylib \
            -dynamiclib -nodefaultlibs -current_version 1 \
            -compatibility_version 1 \
@@ -58,7 +59,7 @@ case $TRIPLE in
    else
        if [ -n "$SDKROOT" ]
        then
-            EXTRA_FLAGS+="-nostdinc++ -isysroot ${SDKROOT}"
+            EXTRA_FLAGS+="-isysroot ${SDKROOT}"
            if echo "${RC_ARCHS}" | grep -q "armv7"  
            then
                RE_EXPORT_LINE="${SDKROOT}/usr/lib/libc++abi.dylib -Wl,-reexported_symbols_list,libc++sjlj-abi.exp"
@@ -96,23 +97,6 @@ case $TRIPLE in
        -shared -nodefaultlibs -Wl,--export-all-symbols -Wl,--allow-multiple-definition -Wl,--out-implib,libc++.dll.a \
        -lsupc++ -lpthread -lmingw32 -lgcc_s -lgcc -lmoldname -lmingwex -lmsvcr100 -ladvapi32 -lshell32 -luser32 -lkernel32 -lmingw32 -lgcc_s -lgcc -lmoldname -lmingwex -lmsvcrt"
    ;;
-  *-ibm-*)
-    hostOS=`uname`
-    hostOS=`echo $hostOS | sed -e "s/\s+$//"`
-    hostOS=`echo $hostOS | tr '[A-Z]' '[a-z]'`
-
-    if [ $hostOS == "linux" ]
-    then
-      LDSHARED_FLAGS="-o libc++.so.1 \
-        -qmkshrobj -Wl,-soname,libc++.so.1 \
-        -lpthread -lrt -lc -lstdc++"
-      EXTRA_FLAGS="-qlanglvl=extended0x -D__GLIBCXX__=1"
-    else
-      LDSHARED_FLAGS="-o shr.o -qmkshrobj -lpthread -bnoquiet"
-      EXTRA_FLAGS="-qlanglvl=extended0x"
-    fi
-    RC_CFLAGS="-qpic=large"
-    ;;
  *)
    RC_CFLAGS="-fPIC"
    SOEXT=so
@@ -122,7 +106,7 @@ case $TRIPLE in
    ;;
 esac

-if [ -z "$RC_XBS" ]
+if [ -z $RC_XBS ]
 then
    rm -f libc++.1.$SOEXT*
 fi
@@ -130,12 +114,12 @@ fi
 set -x

 for FILE in ../src/*.cpp; do
-    $CXX -c -g -Os $RC_CFLAGS $EXTRA_FLAGS -I../include $FILE
+    $CXX -c -g -Os $RC_CFLAGS $EXTRA_FLAGS -nostdinc++ -I../include $FILE
 done
 case $TRIPLE in
  *-*-mingw*)
  for FILE in ../src/support/win32/*.cpp; do
-    $CXX -c -g -Os $RC_CFLAGS $EXTRA_FLAGS -I../include $FILE
+    $CXX -c -g -Os $RC_CFLAGS $EXTRA_FLAGS -nostdinc++ -I../include $FILE
  done
  ;;
 esac
@@ -152,23 +136,13 @@ case $TRIPLE in
        ;;
    *-*-mingw*)
        ;;
-    *-ibm-*)
-        if [ $hostOS == "linux" ]
-        then
-           rm -f libc++.so
-           ln -s libc++.so.1 libc++.so
-        else #AIX
-           rm -f libc++.a
-           ar r libc++.a shr.o
-        fi
-        ;;
    *)
        rm -f libc++.so
        ln -s libc++.so.1 libc++.so
        ;;
 esac

-if [ -z "$RC_XBS" ]
+if [ -z $RC_XBS ]
 then
    rm *.o
 fi
--- a/src/algorithm.cpp
+++ b/src/algorithm.cpp
@@ -7,7 +7,6 @@
 //
 //===----------------------------------------------------------------------===//

-#define _LIBCPP_EXTERN_TEMPLATE(...) extern template __VA_ARGS__;
 #include "algorithm"
 #include "random"
 #include "mutex"
--- a/src/debug.cpp
+++ b/src/debug.cpp
@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//

-#define _LIBCPP_DEBUG 1
+#define _LIBCPP_DEBUG2 1
 #include "__config"
 #include "__debug"
 #include "functional"
@@ -118,19 +118,20 @@ void
 __libcpp_db::__insert_ic(void* __i, const void* __c)
 {
    WLock _(mut());
-    if (__cbeg_ == __cend_)
-        return;
+    __i_node* i = __insert_iterator(__i);
+    const char* errmsg =
+        "Container constructed in a translation unit with debug mode disabled."
+        " But it is being used in a translation unit with debug mode enabled."
+        " Enable it in the other translation unit with #define _LIBCPP_DEBUG2 1";
+    _LIBCPP_ASSERT(__cbeg_ != __cend_, errmsg);
    size_t hc = hash<const void*>()(__c) % static_cast<size_t>(__cend_ - __cbeg_);
    __c_node* c = __cbeg_[hc];
-    if (c == nullptr)
-        return;
+    _LIBCPP_ASSERT(c != nullptr, errmsg);
    while (c->__c_ != __c)
    {
        c = c->__next_;
-        if (c == nullptr)
-            return;
+        _LIBCPP_ASSERT(c != nullptr, errmsg);
    }
-    __i_node* i = __insert_iterator(__i);
    c->__add(i);
    i->__c_ = c;
 }
@@ -216,23 +217,18 @@ void
 __libcpp_db::__invalidate_all(void* __c)
 {
    WLock _(mut());
-    if (__cend_ != __cbeg_)
+    size_t hc = hash<void*>()(__c) % static_cast<size_t>(__cend_ - __cbeg_);
+    __c_node* p = __cbeg_[hc];
+    _LIBCPP_ASSERT(p != nullptr, "debug mode internal logic error __invalidate_all A");
+    while (p->__c_ != __c)
    {
-        size_t hc = hash<void*>()(__c) % static_cast<size_t>(__cend_ - __cbeg_);
-        __c_node* p = __cbeg_[hc];
-        if (p == nullptr)
-            return;
-        while (p->__c_ != __c)
-        {
-            p = p->__next_;
-            if (p == nullptr)
-                return;
-        }
-        while (p->end_ != p->beg_)
-        {
-            --p->end_;
-            (*p->end_)->__c_ = nullptr;
-        }
+        p = p->__next_;
+        _LIBCPP_ASSERT(p != nullptr, "debug mode internal logic error __invalidate_all B");
+    }
+    while (p->end_ != p->beg_)
+    {
+        --p->end_;
+        (*p->end_)->__c_ = nullptr;
    }
 }

@@ -240,26 +236,13 @@ __c_node*
 __libcpp_db::__find_c_and_lock(void* __c) const
 {
    mut().lock();
-    if (__cend_ == __cbeg_)
-    {
-        mut().unlock();
-        return nullptr;
-    }
    size_t hc = hash<void*>()(__c) % static_cast<size_t>(__cend_ - __cbeg_);
    __c_node* p = __cbeg_[hc];
-    if (p == nullptr)
-    {
-        mut().unlock();
-        return nullptr;
-    }
+    _LIBCPP_ASSERT(p != nullptr, "debug mode internal logic error __find_c_and_lock A");
    while (p->__c_ != __c)
    {
        p = p->__next_;
-        if (p == nullptr)
-        {
-            mut().unlock();
-            return nullptr;
-        }
+        _LIBCPP_ASSERT(p != nullptr, "debug mode internal logic error __find_c_and_lock B");
    }
    return p;
 }
@@ -288,35 +271,28 @@ void
 __libcpp_db::__erase_c(void* __c)
 {
    WLock _(mut());
-    if (__cend_ != __cbeg_)
+    size_t hc = hash<void*>()(__c) % static_cast<size_t>(__cend_ - __cbeg_);
+    __c_node* p = __cbeg_[hc];
+    __c_node* q = nullptr;
+    _LIBCPP_ASSERT(p != nullptr, "debug mode internal logic error __erase_c A");
+    while (p->__c_ != __c)
    {
-        size_t hc = hash<void*>()(__c) % static_cast<size_t>(__cend_ - __cbeg_);
-        __c_node* p = __cbeg_[hc];
-        if (p == nullptr)
-            return;
-        __c_node* q = nullptr;
-        _LIBCPP_ASSERT(p != nullptr, "debug mode internal logic error __erase_c A");
-        while (p->__c_ != __c)
-        {
-            q = p;
-            p = p->__next_;
-            if (p == nullptr)
-                return;
-            _LIBCPP_ASSERT(p != nullptr, "debug mode internal logic error __erase_c B");
-        }
-        if (q == nullptr)
-            __cbeg_[hc] = p->__next_;
-        else
-            q->__next_ = p->__next_;
-        while (p->end_ != p->beg_)
-        {
-            --p->end_;
-            (*p->end_)->__c_ = nullptr;
-        }
-        free(p->beg_);
-        free(p);
-        --__csz_;
+        q = p;
+        p = p->__next_;
+        _LIBCPP_ASSERT(p != nullptr, "debug mode internal logic error __erase_c B");
    }
+    if (q == nullptr)
+        __cbeg_[hc] = p->__next_;
+    else
+        q->__next_ = p->__next_;
+    while (p->end_ != p->beg_)
+    {
+        --p->end_;
+        (*p->end_)->__c_ = nullptr;
+    }
+    free(p->beg_);
+    free(p);
+    --__csz_;
 }

 void
@@ -378,7 +354,7 @@ __libcpp_db::__subscriptable(const void* __i, ptrdiff_t __n) const
 }

 bool
-__libcpp_db::__less_than_comparable(const void* __i, const void* __j) const
+__libcpp_db::__comparable(const void* __i, const void* __j) const
 {
    RLock _(mut());
    __i_node* i = __find_iterator(__i);
--- a/src/exception.cpp
+++ b/src/exception.cpp
@@ -7,10 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 #include <stdlib.h>
-#include <stdio.h>

 #include "exception"
-#include "new"

 #ifndef __has_include
 #define __has_include(inc) 0
@@ -24,7 +22,7 @@
  #ifndef _LIBCPPABI_VERSION
    using namespace __cxxabiapple;
    // On Darwin, there are two STL shared libraries and a lower level ABI
-    // shared library.  The globals holding the current terminate handler and
+    // shared libray.  The globals holding the current terminate handler and
    // current unexpected handler are in the ABI library.
    #define __terminate_handler  __cxxabiapple::__cxa_terminate_handler
    #define __unexpected_handler __cxxabiapple::__cxa_unexpected_handler
@@ -79,7 +77,7 @@ get_terminate() _NOEXCEPT
    return __sync_fetch_and_add(&__terminate_handler, (terminate_handler)0);
 }

-#ifndef __EMSCRIPTEN__ // We provide this in JS
+#ifndef EMSCRIPTEN // We provide this in JS
 _LIBCPP_NORETURN
 void
 terminate() _NOEXCEPT
@@ -90,39 +88,31 @@ terminate() _NOEXCEPT
 #endif  // _LIBCPP_NO_EXCEPTIONS
        (*get_terminate())();
        // handler should not return
-        printf("terminate_handler unexpectedly returned\n");
-        ::abort();
+        ::abort ();
 #ifndef _LIBCPP_NO_EXCEPTIONS
    }
    catch (...)
    {
        // handler should not throw exception
-        printf("terminate_handler unexpectedly threw an exception\n");
-        ::abort();
+        ::abort ();
    }
 #endif  // _LIBCPP_NO_EXCEPTIONS
 }
-#endif // !__EMSCRIPTEN__
+#endif // !EMSCRIPTEN
 #endif // !defined(LIBCXXRT) && !defined(_LIBCPPABI_VERSION)

-#if !defined(LIBCXXRT) && !defined(__GLIBCXX__) && !defined(__EMSCRIPTEN__)
+#if !defined(LIBCXXRT) && !defined(__GLIBCXX__) && !defined(EMSCRIPTEN)
 bool uncaught_exception() _NOEXCEPT
 {
 #if defined(__APPLE__) || defined(_LIBCPPABI_VERSION)
    // on Darwin, there is a helper function so __cxa_get_globals is private
    return __cxa_uncaught_exception();
 #else  // __APPLE__
-#   if defined(_MSC_VER) && ! defined(__clang__)
-        _LIBCPP_WARNING("uncaught_exception not yet implemented")
-#   else
-#       warning uncaught_exception not yet implemented
-#   endif
-    printf("uncaught_exception not yet implemented\n");
+    #warning uncaught_exception not yet implemented
    ::abort();
 #endif  // __APPLE__
 }

-
 #ifndef _LIBCPPABI_VERSION

 exception::~exception() _NOEXCEPT
@@ -149,50 +139,15 @@ const char* bad_exception::what() const _NOEXCEPT

 #endif

-#if defined(__GLIBCXX__)
-
-// libsupc++ does not implement the dependent EH ABI and the functionality
-// it uses to implement std::exception_ptr (which it declares as an alias of
-// std::__exception_ptr::exception_ptr) is not directly exported to clients. So
-// we have little choice but to hijack std::__exception_ptr::exception_ptr's
-// (which fortunately has the same layout as our std::exception_ptr) copy
-// constructor, assignment operator and destructor (which are part of its
-// stable ABI), and its rethrow_exception(std::__exception_ptr::exception_ptr)
-// function.
-
-namespace __exception_ptr
-{
-
-struct exception_ptr
-{
-    void* __ptr_;
-
-    exception_ptr(const exception_ptr&) _NOEXCEPT;
-    exception_ptr& operator=(const exception_ptr&) _NOEXCEPT;
-    ~exception_ptr() _NOEXCEPT;
-};
-
-}
-
-_LIBCPP_NORETURN void rethrow_exception(__exception_ptr::exception_ptr);
-
-#endif

 exception_ptr::~exception_ptr() _NOEXCEPT
 {
 #if HAVE_DEPENDENT_EH_ABI
    __cxa_decrement_exception_refcount(__ptr_);
-#elif defined(__GLIBCXX__)
-    reinterpret_cast<__exception_ptr::exception_ptr*>(this)->~exception_ptr();
 #else
-#   if defined(_MSC_VER) && ! defined(__clang__)
-        _LIBCPP_WARNING("exception_ptr not yet implemented")
-#   else
-#       warning exception_ptr not yet implemented
-#   endif
-    printf("exception_ptr not yet implemented\n");
+    #warning exception_ptr not yet implemented
    ::abort();
-#endif
+#endif  // __APPLE__
 }

 exception_ptr::exception_ptr(const exception_ptr& other) _NOEXCEPT
@@ -200,18 +155,10 @@ exception_ptr::exception_ptr(const exception_ptr& other) _NOEXCEPT
 {
 #if HAVE_DEPENDENT_EH_ABI
    __cxa_increment_exception_refcount(__ptr_);
-#elif defined(__GLIBCXX__)
-    new (reinterpret_cast<void*>(this)) __exception_ptr::exception_ptr(
-        reinterpret_cast<const __exception_ptr::exception_ptr&>(other));
 #else
-#   if defined(_MSC_VER) && ! defined(__clang__)
-        _LIBCPP_WARNING("exception_ptr not yet implemented")
-#   else
-#       warning exception_ptr not yet implemented
-#   endif
-    printf("exception_ptr not yet implemented\n");
+    #warning exception_ptr not yet implemented
    ::abort();
-#endif
+#endif  // __APPLE__
 }

 exception_ptr& exception_ptr::operator=(const exception_ptr& other) _NOEXCEPT
@@ -224,19 +171,10 @@ exception_ptr& exception_ptr::operator=(const exception_ptr& other) _NOEXCEPT
        __ptr_ = other.__ptr_;
    }
    return *this;
-#elif defined(__GLIBCXX__)
-    *reinterpret_cast<__exception_ptr::exception_ptr*>(this) =
-        reinterpret_cast<const __exception_ptr::exception_ptr&>(other);
-    return *this;
-#else
-#   if defined(_MSC_VER) && ! defined(__clang__)
-        _LIBCPP_WARNING("exception_ptr not yet implemented")
-#   else
-#       warning exception_ptr not yet implemented
-#   endif
-    printf("exception_ptr not yet implemented\n");
+#else  // __APPLE__
+    #warning exception_ptr not yet implemented
    ::abort();
-#endif
+#endif  // __APPLE__
 }

 nested_exception::nested_exception() _NOEXCEPT
@@ -244,14 +182,10 @@ nested_exception::nested_exception() _NOEXCEPT
 {
 }

-#if !defined(__GLIBCXX__)
-
 nested_exception::~nested_exception() _NOEXCEPT
 {
 }

-#endif
-
 _LIBCPP_NORETURN
 void
 nested_exception::rethrow_nested() const
@@ -261,7 +195,6 @@ nested_exception::rethrow_nested() const
    rethrow_exception(__ptr_);
 }

-#if !defined(__GLIBCXX__)

 exception_ptr current_exception() _NOEXCEPT
 {
@@ -272,19 +205,12 @@ exception_ptr current_exception() _NOEXCEPT
    exception_ptr ptr;
    ptr.__ptr_ = __cxa_current_primary_exception();
    return ptr;
-#else
-#   if defined(_MSC_VER) && ! defined(__clang__)
-        _LIBCPP_WARNING( "exception_ptr not yet implemented" )
-#   else
-#       warning exception_ptr not yet implemented
-#   endif
-    printf("exception_ptr not yet implemented\n");
+#else  // __APPLE__
+    #warning exception_ptr not yet implemented
    ::abort();
-#endif
+#endif  // __APPLE__
 }

-#endif  // !__GLIBCXX__
-
 _LIBCPP_NORETURN
 void rethrow_exception(exception_ptr p)
 {
@@ -292,16 +218,9 @@ void rethrow_exception(exception_ptr p)
    __cxa_rethrow_primary_exception(p.__ptr_);
    // if p.__ptr_ is NULL, above returns so we terminate
    terminate();
-#elif defined(__GLIBCXX__)
-    rethrow_exception(reinterpret_cast<__exception_ptr::exception_ptr&>(p));
-#else
-#   if defined(_MSC_VER) && ! defined(__clang__)
-        _LIBCPP_WARNING("exception_ptr not yet implemented")
-#   else
-#       warning exception_ptr not yet implemented
-#   endif
-    printf("exception_ptr not yet implemented\n");
+#else  // __APPLE__
+    #warning exception_ptr not yet implemented
    ::abort();
-#endif
+#endif  // __APPLE__
 }
 } // std
--- a/src/future.cpp
+++ b/src/future.cpp
@@ -26,20 +26,11 @@ __future_error_category::name() const _NOEXCEPT
    return "future";
 }

-#if defined(__clang__)
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wswitch"
-#elif defined(__GNUC__) || defined(__GNUG__)
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wswitch"
-#endif
-
 string
 __future_error_category::message(int ev) const
 {
    switch (static_cast<future_errc>(ev))
    {
-    case future_errc(0):  // For backwards compatibility with C++11 (LWG 2056)
    case future_errc::broken_promise:
        return string("The associated promise has been destructed prior "
                      "to the associated state becoming ready.");
@@ -55,12 +46,6 @@ __future_error_category::message(int ev) const
    return string("unspecified future_errc value\n");
 }

-#if defined(__clang__)
-#pragma clang diagnostic pop
-#elif defined(__GNUC__) || defined(__GNUG__)
-#pragma GCC diagnostic pop
-#endif
-
 const error_category&
 future_category() _NOEXCEPT
 {
--- a/src/ios.cpp
+++ b/src/ios.cpp
@@ -7,8 +7,6 @@
 //
 //===----------------------------------------------------------------------===//

-#define _LIBCPP_EXTERN_TEMPLATE(...) extern template __VA_ARGS__;
-
 #include "ios"
 #include "streambuf"
 #include "istream"
@@ -63,7 +61,7 @@ __iostream_category::message(int ev) const
 }

 const error_category&
-iostream_category() _NOEXCEPT
+iostream_category()
 {
    static __iostream_category s;
    return s;
@@ -149,11 +147,8 @@ ios_base::getloc() const
 }

 // xalloc
-#if __has_feature(cxx_atomic)
-atomic<int> ios_base::__xindex_ = ATOMIC_VAR_INIT(0);
-#else
+
 int ios_base::__xindex_ = 0;
-#endif

 int
 ios_base::xalloc()
--- a/src/iostream.cpp
+++ b/src/iostream.cpp
@@ -22,14 +22,14 @@ _ALIGNAS_TYPE (__stdinbuf<wchar_t> ) static char __wcin [sizeof(__stdinbuf <wcha
 _ALIGNAS_TYPE (__stdoutbuf<wchar_t>) static char __wcout[sizeof(__stdoutbuf<wchar_t>)];
 _ALIGNAS_TYPE (__stdoutbuf<wchar_t>) static char __wcerr[sizeof(__stdoutbuf<wchar_t>)];

-_ALIGNAS_TYPE (istream)  _LIBCPP_FUNC_VIS char cin [sizeof(istream)];
-_ALIGNAS_TYPE (ostream)  _LIBCPP_FUNC_VIS char cout[sizeof(ostream)];
-_ALIGNAS_TYPE (ostream)  _LIBCPP_FUNC_VIS char cerr[sizeof(ostream)];
-_ALIGNAS_TYPE (ostream)  _LIBCPP_FUNC_VIS char clog[sizeof(ostream)];
-_ALIGNAS_TYPE (wistream) _LIBCPP_FUNC_VIS char wcin [sizeof(wistream)];
-_ALIGNAS_TYPE (wostream) _LIBCPP_FUNC_VIS char wcout[sizeof(wostream)];
-_ALIGNAS_TYPE (wostream) _LIBCPP_FUNC_VIS char wcerr[sizeof(wostream)];
-_ALIGNAS_TYPE (wostream) _LIBCPP_FUNC_VIS char wclog[sizeof(wostream)];
+_ALIGNAS_TYPE (istream) char cin [sizeof(istream)];
+_ALIGNAS_TYPE (ostream) char cout[sizeof(ostream)];
+_ALIGNAS_TYPE (ostream) char cerr[sizeof(ostream)];
+_ALIGNAS_TYPE (ostream) char clog[sizeof(ostream)];
+_ALIGNAS_TYPE (wistream) char wcin [sizeof(wistream)];
+_ALIGNAS_TYPE (wostream) char wcout[sizeof(wostream)];
+_ALIGNAS_TYPE (wostream) char wcerr[sizeof(wostream)];
+_ALIGNAS_TYPE (wostream) char wclog[sizeof(wostream)];

 ios_base::Init __start_std_streams;

--- a/src/locale.cpp
+++ b/src/locale.cpp
@@ -7,8 +7,6 @@
 //
 //===----------------------------------------------------------------------===//

-#define _LIBCPP_EXTERN_TEMPLATE(...) extern template __VA_ARGS__;
-
 // On Solaris, we need to define something to make the C99 parts of localeconv
 // visible.
 #ifdef __sun__
@@ -20,27 +18,23 @@
 #include "codecvt"
 #include "vector"
 #include "algorithm"
+#include "algorithm"
 #include "typeinfo"
-#ifndef _LIBCPP_NO_EXCEPTIONS
-#  include "type_traits"
-#endif
+#include "type_traits"
 #include "clocale"
 #include "cstring"
 #include "cwctype"
 #include "__sso_allocator"
-#if defined(_LIBCPP_MSVCRT) || defined(__MINGW32__)
+#ifdef _WIN32
 #include <support/win32/locale_win32.h>
-#else // _LIBCPP_MSVCRT
+#else // _WIN32
 #include <langinfo.h>
-#endif // !_LIBCPP_MSVCRT
+#endif // _!WIN32
 #include <stdlib.h>
-#include <stdio.h>

 // On Linux, wint_t and wchar_t have different signed-ness, and this causes
 // lots of noise in the build log, but no bugs that I know of. 
-#if defined(__clang__)
 #pragma clang diagnostic ignored "-Wsign-conversion"
-#endif

 _LIBCPP_BEGIN_NAMESPACE_STD

@@ -111,11 +105,6 @@ countof(const T * const begin, const T * const end)

 }

-#if defined(_AIX)
-// Set priority to INT_MIN + 256 + 150
-# pragma priority ( -2147483242 )
-#endif
-
 const locale::category locale::none;
 const locale::category locale::collate;
 const locale::category locale::ctype;
@@ -125,23 +114,14 @@ const locale::category locale::time;
 const locale::category locale::messages;
 const locale::category locale::all;

-#if defined(__clang__)
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wpadded"
-#endif

 class _LIBCPP_HIDDEN locale::__imp
    : public facet
 {
    enum {N = 28};
-#if defined(_LIBCPP_MSVC)
-// FIXME: MSVC doesn't support aligned parameters by value.
-// I can't get the __sso_allocator to work here
-// for MSVC I think for this reason.
-    vector<facet*> facets_;
-#else
    vector<facet*, __sso_allocator<facet*, N> > facets_;
-#endif
    string         name_;
 public:
    explicit __imp(size_t refs = 0);
@@ -165,9 +145,7 @@ private:
    template <class F> void install_from(const __imp& other);
 };

-#if defined(__clang__)
 #pragma clang diagnostic pop
-#endif

 locale::__imp::__imp(size_t refs)
    : facet(refs),
@@ -777,7 +755,7 @@ ctype<wchar_t>::~ctype()
 bool
 ctype<wchar_t>::do_is(mask m, char_type c) const
 {
-    return isascii(c) ? (ctype<char>::classic_table()[c] & m) != 0 : false;
+    return isascii(c) ? ctype<char>::classic_table()[c] & m : false;
 }

 const wchar_t*
@@ -812,7 +790,7 @@ ctype<wchar_t>::do_toupper(char_type c) const
 {
 #ifdef _LIBCPP_HAS_DEFAULTRUNELOCALE
    return isascii(c) ? _DefaultRuneLocale.__mapupper[c] : c;
-#elif defined(__GLIBC__) || defined(__EMSCRIPTEN__) || defined(__NetBSD__)
+#elif defined(__GLIBC__) || defined(EMSCRIPTEN)
    return isascii(c) ? ctype<char>::__classic_upper_table()[c] : c;
 #else
    return (isascii(c) && iswlower_l(c, __cloc())) ? c-L'a'+L'A' : c;
@@ -825,7 +803,7 @@ ctype<wchar_t>::do_toupper(char_type* low, const char_type* high) const
    for (; low != high; ++low)
 #ifdef _LIBCPP_HAS_DEFAULTRUNELOCALE
        *low = isascii(*low) ? _DefaultRuneLocale.__mapupper[*low] : *low;
-#elif defined(__GLIBC__) || defined(__EMSCRIPTEN__) || defined(__NetBSD__)
+#elif defined(__GLIBC__) || defined(EMSCRIPTEN)
        *low = isascii(*low) ? ctype<char>::__classic_upper_table()[*low]
                             : *low;
 #else
@@ -839,7 +817,7 @@ ctype<wchar_t>::do_tolower(char_type c) const
 {
 #ifdef _LIBCPP_HAS_DEFAULTRUNELOCALE
    return isascii(c) ? _DefaultRuneLocale.__maplower[c] : c;
-#elif defined(__GLIBC__) || defined(__EMSCRIPTEN__) || defined(__NetBSD__)
+#elif defined(__GLIBC__) || defined(EMSCRIPTEN)
    return isascii(c) ? ctype<char>::__classic_lower_table()[c] : c;
 #else
    return (isascii(c) && isupper_l(c, __cloc())) ? c-L'A'+'a' : c;
@@ -852,7 +830,7 @@ ctype<wchar_t>::do_tolower(char_type* low, const char_type* high) const
    for (; low != high; ++low)
 #ifdef _LIBCPP_HAS_DEFAULTRUNELOCALE
        *low = isascii(*low) ? _DefaultRuneLocale.__maplower[*low] : *low;
-#elif defined(__GLIBC__) || defined(__EMSCRIPTEN__) || defined(__NetBSD__)
+#elif defined(__GLIBC__) || defined(EMSCRIPTEN)
        *low = isascii(*low) ? ctype<char>::__classic_lower_table()[*low]
                             : *low;
 #else
@@ -919,11 +897,9 @@ ctype<char>::do_toupper(char_type c) const
 #ifdef _LIBCPP_HAS_DEFAULTRUNELOCALE
    return isascii(c) ?
      static_cast<char>(_DefaultRuneLocale.__mapupper[static_cast<ptrdiff_t>(c)]) : c;
-#elif defined(__NetBSD__)
-    return static_cast<char>(__classic_upper_table()[static_cast<unsigned char>(c)]);
-#elif defined(__GLIBC__) || defined(__EMSCRIPTEN__)
+#elif defined(__GLIBC__) || defined(EMSCRIPTEN)
    return isascii(c) ? 
-      static_cast<char>(__classic_upper_table()[static_cast<unsigned char>(c)]) : c;
+      static_cast<char>(__classic_upper_table()[static_cast<size_t>(c)]) : c;
 #else
    return (isascii(c) && islower_l(c, __cloc())) ? c-'a'+'A' : c;
 #endif
@@ -936,9 +912,7 @@ ctype<char>::do_toupper(char_type* low, const char_type* high) const
 #ifdef _LIBCPP_HAS_DEFAULTRUNELOCALE
        *low = isascii(*low) ?
          static_cast<char>(_DefaultRuneLocale.__mapupper[static_cast<ptrdiff_t>(*low)]) : *low;
-#elif defined(__NetBSD__)
-        *low = static_cast<char>(__classic_upper_table()[static_cast<unsigned char>(*low)]);
-#elif defined(__GLIBC__) || defined(__EMSCRIPTEN__)
+#elif defined(__GLIBC__) || defined(EMSCRIPTEN)
        *low = isascii(*low) ?
          static_cast<char>(__classic_upper_table()[static_cast<size_t>(*low)]) : *low;
 #else
@@ -953,9 +927,7 @@ ctype<char>::do_tolower(char_type c) const
 #ifdef _LIBCPP_HAS_DEFAULTRUNELOCALE
    return isascii(c) ?
      static_cast<char>(_DefaultRuneLocale.__maplower[static_cast<ptrdiff_t>(c)]) : c;
-#elif defined(__NetBSD__)
-    return static_cast<char>(__classic_lower_table()[static_cast<unsigned char>(c)]);
-#elif defined(__GLIBC__) || defined(__EMSCRIPTEN__) || defined(__NetBSD__)
+#elif defined(__GLIBC__) || defined(EMSCRIPTEN)
    return isascii(c) ?
      static_cast<char>(__classic_lower_table()[static_cast<size_t>(c)]) : c;
 #else
@@ -969,9 +941,7 @@ ctype<char>::do_tolower(char_type* low, const char_type* high) const
    for (; low != high; ++low)
 #ifdef _LIBCPP_HAS_DEFAULTRUNELOCALE
        *low = isascii(*low) ? static_cast<char>(_DefaultRuneLocale.__maplower[static_cast<ptrdiff_t>(*low)]) : *low;
-#elif defined(__NetBSD__)
-        *low = static_cast<char>(__classic_lower_table()[static_cast<unsigned char>(*low)]);
-#elif defined(__GLIBC__) || defined(__EMSCRIPTEN__)
+#elif defined(__GLIBC__) || defined(EMSCRIPTEN)
        *low = isascii(*low) ? static_cast<char>(__classic_lower_table()[static_cast<size_t>(*low)]) : *low;
 #else
        *low = (isascii(*low) && isupper_l(*low, __cloc())) ? *low-'A'+'a' : *low;
@@ -1012,7 +982,7 @@ ctype<char>::do_narrow(const char_type* low, const char_type* high, char dfault,
    return low;
 }

-#ifdef __EMSCRIPTEN__
+#ifdef EMSCRIPTEN
 extern "C" const unsigned short ** __ctype_b_loc();
 extern "C" const int ** __ctype_tolower_loc();
 extern "C" const int ** __ctype_toupper_loc();
@@ -1023,25 +993,20 @@ ctype<char>::classic_table()  _NOEXCEPT
 {
 #if defined(__APPLE__) || defined(__FreeBSD__)
    return _DefaultRuneLocale.__runetype;
-#elif defined(__NetBSD__)
-    return _C_ctype_tab_ + 1;
 #elif defined(__GLIBC__)
    return __cloc()->__ctype_b;
 #elif __sun__
    return __ctype_mask;
-#elif defined(_LIBCPP_MSVCRT) || defined(__MINGW32__)
+#elif defined(_WIN32)
    return _ctype+1; // internal ctype mask table defined in msvcrt.dll
 // This is assumed to be safe, which is a nonsense assumption because we're
 // going to end up dereferencing it later...
-#elif defined(__EMSCRIPTEN__)
+#elif defined(EMSCRIPTEN)
    return *__ctype_b_loc();
-#elif defined(_AIX)
-    return (const unsigned long *)__lc_ctype_ptr->obj->mask;
 #else
    // Platform not supported: abort so the person doing the port knows what to
    // fix
 # warning  ctype<char>::classic_table() is not implemented
-    printf("ctype<char>::classic_table() is not implemented\n");
    abort();
    return NULL;
 #endif
@@ -1059,20 +1024,9 @@ ctype<char>::__classic_upper_table() _NOEXCEPT
 {
    return __cloc()->__ctype_toupper;
 }
-#elif __NetBSD__
-const short*
-ctype<char>::__classic_lower_table() _NOEXCEPT
-{
-    return _C_tolower_tab_ + 1;
-}
+#endif // __GLIBC__

-const short*
-ctype<char>::__classic_upper_table() _NOEXCEPT
-{
-    return _C_toupper_tab_ + 1;
-}
-
-#elif defined(__EMSCRIPTEN__)
+#if defined(EMSCRIPTEN)
 const int*
 ctype<char>::__classic_lower_table() _NOEXCEPT
 {
@@ -1084,7 +1038,7 @@ ctype<char>::__classic_upper_table() _NOEXCEPT
 {
    return *__ctype_toupper_loc();
 }
-#endif // __GLIBC__ || __EMSCRIPTEN__ || __NETBSD__
+#endif // EMSCRIPTEN

 // template <> class ctype_byname<char>

@@ -1422,7 +1376,7 @@ locale::id codecvt<wchar_t, char, mbstate_t>::id;

 codecvt<wchar_t, char, mbstate_t>::codecvt(size_t refs)
    : locale::facet(refs),
-      __l(_LIBCPP_GET_C_LOCALE)
+      __l(0)
 {
 }

@@ -1439,7 +1393,7 @@ codecvt<wchar_t, char, mbstate_t>::codecvt(const char* nm, size_t refs)

 codecvt<wchar_t, char, mbstate_t>::~codecvt()
 {
-    if (__l != _LIBCPP_GET_C_LOCALE)
+    if (__l != 0)
        freelocale(__l);
 }

@@ -3226,25 +3180,14 @@ __codecvt_utf8<wchar_t>::do_out(state_type&,
    const intern_type* frm, const intern_type* frm_end, const intern_type*& frm_nxt,
    extern_type* to, extern_type* to_end, extern_type*& to_nxt) const
 {
-#if _WIN32
-    const uint16_t* _frm = reinterpret_cast<const uint16_t*>(frm);
-    const uint16_t* _frm_end = reinterpret_cast<const uint16_t*>(frm_end);
-    const uint16_t* _frm_nxt = _frm;
-#else
    const uint32_t* _frm = reinterpret_cast<const uint32_t*>(frm);
    const uint32_t* _frm_end = reinterpret_cast<const uint32_t*>(frm_end);
    const uint32_t* _frm_nxt = _frm;
-#endif
    uint8_t* _to = reinterpret_cast<uint8_t*>(to);
    uint8_t* _to_end = reinterpret_cast<uint8_t*>(to_end);
    uint8_t* _to_nxt = _to;
-#if _WIN32
-    result r = ucs2_to_utf8(_frm, _frm_end, _frm_nxt, _to, _to_end, _to_nxt,
-                            _Maxcode_, _Mode_);
-#else
    result r = ucs4_to_utf8(_frm, _frm_end, _frm_nxt, _to, _to_end, _to_nxt,
                            _Maxcode_, _Mode_);
-#endif
    frm_nxt = frm + (_frm_nxt - _frm);
    to_nxt = to + (_to_nxt - _to);
    return r;
@@ -3258,19 +3201,11 @@ __codecvt_utf8<wchar_t>::do_in(state_type&,
    const uint8_t* _frm = reinterpret_cast<const uint8_t*>(frm);
    const uint8_t* _frm_end = reinterpret_cast<const uint8_t*>(frm_end);
    const uint8_t* _frm_nxt = _frm;
-#if _WIN32
-    uint16_t* _to = reinterpret_cast<uint16_t*>(to);
-    uint16_t* _to_end = reinterpret_cast<uint16_t*>(to_end);
-    uint16_t* _to_nxt = _to;
-    result r = utf8_to_ucs2(_frm, _frm_end, _frm_nxt, _to, _to_end, _to_nxt,
-                            _Maxcode_, _Mode_);
-#else
    uint32_t* _to = reinterpret_cast<uint32_t*>(to);
    uint32_t* _to_end = reinterpret_cast<uint32_t*>(to_end);
    uint32_t* _to_nxt = _to;
    result r = utf8_to_ucs4(_frm, _frm_end, _frm_nxt, _to, _to_end, _to_nxt,
                            _Maxcode_, _Mode_);
-#endif
    frm_nxt = frm + (_frm_nxt - _frm);
    to_nxt = to + (_to_nxt - _to);
    return r;
@@ -4372,7 +4307,7 @@ __num_put_base::__format_float(char* __fmtp, const char* __len,
    if (__flags & ios_base::showpoint)
        *__fmtp++ = '#';
    ios_base::fmtflags floatfield = __flags & ios_base::floatfield;
-    bool uppercase = (__flags & ios_base::uppercase) != 0;
+    bool uppercase = __flags & ios_base::uppercase;
    if (floatfield == (ios_base::fixed | ios_base::scientific))
        specify_precision = false;
    else
@@ -4703,12 +4638,9 @@ __time_get::~__time_get()
 {
    freelocale(__loc_);
 }
-#if defined(__clang__)
+
 #pragma clang diagnostic ignored "-Wmissing-field-initializers"
-#endif
-#if defined(__GNUG__)
 #pragma GCC   diagnostic ignored "-Wmissing-field-initializers"
-#endif

 template <>
 string
@@ -4854,9 +4786,7 @@ __time_get_storage<char>::__analyze(char fmt, const ctype<char>& ct)
    return result;
 }

-#if defined(__clang__)
 #pragma clang diagnostic ignored "-Wmissing-braces"
-#endif

 template <>
 wstring
@@ -5389,7 +5319,7 @@ __time_put::__time_put(const string& nm)

 __time_put::~__time_put()
 {
-    if (__loc_ != _LIBCPP_GET_C_LOCALE)
+    if (__loc_)
        freelocale(__loc_);
 }

@@ -5875,19 +5805,19 @@ moneypunct_byname<char, true>::init(const char* nm)
        __frac_digits_ = lc->int_frac_digits;
    else
        __frac_digits_ = base::do_frac_digits();
-#if defined(_LIBCPP_MSVCRT) || defined(__MINGW32__)
+#ifdef _WIN32
    if (lc->p_sign_posn == 0)
-#else // _LIBCPP_MSVCRT
+#else // _WIN32
    if (lc->int_p_sign_posn == 0)
-#endif // !_LIBCPP_MSVCRT
+#endif //_WIN32
        __positive_sign_ = "()";
    else
        __positive_sign_ = lc->positive_sign;
-#if defined(_LIBCPP_MSVCRT) || defined(__MINGW32__)
+#ifdef _WIN32
    if(lc->n_sign_posn == 0)
-#else // _LIBCPP_MSVCRT
+#else // _WIN32
    if (lc->int_n_sign_posn == 0)
-#endif // !_LIBCPP_MSVCRT
+#endif // _WIN32
        __negative_sign_ = "()";
    else
        __negative_sign_ = lc->negative_sign;
@@ -5895,19 +5825,19 @@ moneypunct_byname<char, true>::init(const char* nm)
    // the same places in curr_symbol since there's no way to
    // represent anything else.
    string_type __dummy_curr_symbol = __curr_symbol_;
-#if defined(_LIBCPP_MSVCRT) || defined(__MINGW32__)
+#ifdef _WIN32
    __init_pat(__pos_format_, __dummy_curr_symbol, true,
               lc->p_cs_precedes, lc->p_sep_by_space, lc->p_sign_posn, ' ');
    __init_pat(__neg_format_, __curr_symbol_, true,
               lc->n_cs_precedes, lc->n_sep_by_space, lc->n_sign_posn, ' ');
-#else // _LIBCPP_MSVCRT
+#else
    __init_pat(__pos_format_, __dummy_curr_symbol, true,
               lc->int_p_cs_precedes, lc->int_p_sep_by_space,
               lc->int_p_sign_posn, ' ');
    __init_pat(__neg_format_, __curr_symbol_, true,
               lc->int_n_cs_precedes, lc->int_n_sep_by_space,
               lc->int_n_sign_posn, ' ');
-#endif // !_LIBCPP_MSVCRT
+#endif // _WIN32
 }

 template<>
@@ -6034,11 +5964,11 @@ moneypunct_byname<wchar_t, true>::init(const char* nm)
        __frac_digits_ = lc->int_frac_digits;
    else
        __frac_digits_ = base::do_frac_digits();
-#if defined(_LIBCPP_MSVCRT) || defined(__MINGW32__)
+#ifdef _WIN32
    if (lc->p_sign_posn == 0)
-#else // _LIBCPP_MSVCRT
+#else // _WIN32
    if (lc->int_p_sign_posn == 0)
-#endif // !_LIBCPP_MSVCRT
+#endif // _WIN32
        __positive_sign_ = L"()";
    else
    {
@@ -6054,11 +5984,11 @@ moneypunct_byname<wchar_t, true>::init(const char* nm)
        wbe = wbuf + j;
        __positive_sign_.assign(wbuf, wbe);
    }
-#if defined(_LIBCPP_MSVCRT) || defined(__MINGW32__)
+#ifdef _WIN32
    if (lc->n_sign_posn == 0)
-#else // _LIBCPP_MSVCRT
+#else // _WIN32
    if (lc->int_n_sign_posn == 0)
-#endif // !_LIBCPP_MSVCRT
+#endif // _WIN32
        __negative_sign_ = L"()";
    else
    {
@@ -6078,19 +6008,19 @@ moneypunct_byname<wchar_t, true>::init(const char* nm)
    // the same places in curr_symbol since there's no way to
    // represent anything else.
    string_type __dummy_curr_symbol = __curr_symbol_;
-#if defined(_LIBCPP_MSVCRT) || defined(__MINGW32__)
+#ifdef _WIN32
    __init_pat(__pos_format_, __dummy_curr_symbol, true,
               lc->p_cs_precedes, lc->p_sep_by_space, lc->p_sign_posn, L' ');
    __init_pat(__neg_format_, __curr_symbol_, true,
               lc->n_cs_precedes, lc->n_sep_by_space, lc->n_sign_posn, L' ');
-#else // _LIBCPP_MSVCRT
+#else // _WIN32
    __init_pat(__pos_format_, __dummy_curr_symbol, true,
               lc->int_p_cs_precedes, lc->int_p_sep_by_space,
               lc->int_p_sign_posn, L' ');
    __init_pat(__neg_format_, __curr_symbol_, true,
               lc->int_n_cs_precedes, lc->int_n_sep_by_space,
               lc->int_n_sign_posn, L' ');
-#endif // !_LIBCPP_MSVCRT
+#endif // _WIN32
 }

 void __do_nothing(void*) {}
--- a/src/mutex.cpp
+++ b/src/mutex.cpp
@@ -42,7 +42,6 @@ void
 mutex::unlock() _NOEXCEPT
 {
    int ec = pthread_mutex_unlock(&__m_);
-    (void)ec;
    assert(ec == 0);
 }

@@ -80,7 +79,6 @@ fail:
 recursive_mutex::~recursive_mutex()
 {
    int e = pthread_mutex_destroy(&__m_);
-    (void)e;
    assert(e == 0);
 }

@@ -96,7 +94,6 @@ void
 recursive_mutex::unlock() _NOEXCEPT
 {
    int e = pthread_mutex_unlock(&__m_);
-    (void)e;
    assert(e == 0);
 }

--- a/src/new.cpp
+++ b/src/new.cpp
@@ -7,8 +7,6 @@
 //
 //===----------------------------------------------------------------------===//

-#define _LIBCPP_BUILDING_NEW
-
 #include <stdlib.h>

 #include "new"
@@ -22,7 +20,7 @@

    #ifndef _LIBCPPABI_VERSION
        // On Darwin, there are two STL shared libraries and a lower level ABI
-        // shared library.  The global holding the current new handler is
+        // shared libray.  The global holding the current new handler is
        // in the ABI library and named __cxa_new_handler.
        #define __new_handler __cxxabiapple::__cxa_new_handler
    #endif
@@ -30,18 +28,16 @@
    #if defined(LIBCXXRT) || __has_include(<cxxabi.h>)
        #include <cxxabi.h>
    #endif  // __has_include(<cxxabi.h>)
-    #if !defined(_LIBCPPABI_VERSION) && !defined(__GLIBCXX__)
+    #ifndef _LIBCPPABI_VERSION
        static std::new_handler __new_handler;
    #endif  // _LIBCPPABI_VERSION
 #endif

-#ifndef __GLIBCXX__
-
 // Implement all new and delete operators as weak definitions
 // in this shared library, so that they can be overriden by programs
 // that define non-weak copies of the functions.

-_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
+__attribute__((__weak__, __visibility__("default")))
 void *
 operator new(std::size_t size)
 #if !__has_feature(cxx_noexcept)
@@ -68,7 +64,7 @@ operator new(std::size_t size)
    return p;
 }

-_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
+__attribute__((__weak__, __visibility__("default")))
 void*
 operator new(size_t size, const std::nothrow_t&) _NOEXCEPT
 {
@@ -87,7 +83,7 @@ operator new(size_t size, const std::nothrow_t&) _NOEXCEPT
    return p;
 }

-_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
+__attribute__((__weak__, __visibility__("default")))
 void*
 operator new[](size_t size)
 #if !__has_feature(cxx_noexcept)
@@ -97,7 +93,7 @@ operator new[](size_t size)
    return ::operator new(size);
 }

-_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
+__attribute__((__weak__, __visibility__("default")))
 void*
 operator new[](size_t size, const std::nothrow_t&) _NOEXCEPT
 {
@@ -116,7 +112,7 @@ operator new[](size_t size, const std::nothrow_t&) _NOEXCEPT
    return p;
 }

-_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
+__attribute__((__weak__, __visibility__("default")))
 void
 operator delete(void* ptr) _NOEXCEPT
 {
@@ -124,40 +120,34 @@ operator delete(void* ptr) _NOEXCEPT
        ::free(ptr);
 }

-_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
+__attribute__((__weak__, __visibility__("default")))
 void
 operator delete(void* ptr, const std::nothrow_t&) _NOEXCEPT
 {
    ::operator delete(ptr);
 }

-_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
+__attribute__((__weak__, __visibility__("default")))
 void
 operator delete[] (void* ptr) _NOEXCEPT
 {
    ::operator delete (ptr);
 }

-_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
+__attribute__((__weak__, __visibility__("default")))
 void
 operator delete[] (void* ptr, const std::nothrow_t&) _NOEXCEPT
 {
    ::operator delete[](ptr);
 }

-#endif // !__GLIBCXX__
-
 namespace std
 {

-#ifndef __GLIBCXX__
 const nothrow_t nothrow = {};
-#endif

 #ifndef _LIBCPPABI_VERSION

-#ifndef __GLIBCXX__
-
 new_handler
 set_new_handler(new_handler handler) _NOEXCEPT
 {
@@ -170,16 +160,12 @@ get_new_handler() _NOEXCEPT
    return __sync_fetch_and_add(&__new_handler, (new_handler)0);
 }

-#endif // !__GLIBCXX__
-
 #ifndef LIBCXXRT

 bad_alloc::bad_alloc() _NOEXCEPT
 {
 }

-#ifndef __GLIBCXX__
-
 bad_alloc::~bad_alloc() _NOEXCEPT
 {
 }
@@ -190,8 +176,6 @@ bad_alloc::what() const _NOEXCEPT
    return "std::bad_alloc";
 }

-#endif // !__GLIBCXX__
-
 #endif //LIBCXXRT

 bad_array_new_length::bad_array_new_length() _NOEXCEPT
@@ -202,29 +186,13 @@ bad_array_new_length::~bad_array_new_length() _NOEXCEPT
 {
 }

-const char*
-bad_array_length::what() const _NOEXCEPT
-{
-    return "bad_array_length";
-}
-
-bad_array_length::bad_array_length() _NOEXCEPT
-{
-}
-
-bad_array_length::~bad_array_length() _NOEXCEPT
-{
-}
-
 const char*
 bad_array_new_length::what() const _NOEXCEPT
 {
    return "bad_array_new_length";
 }

-#endif // _LIBCPPABI_VERSION
-
-#ifndef LIBSTDCXX
+#endif

 void
 __throw_bad_alloc()
@@ -234,6 +202,4 @@ __throw_bad_alloc()
 #endif
 }

-#endif // !LIBSTDCXX
-
 }  // std
--- a/src/optional.cpp
+++ b/src/optional.cpp
@@ -1,25 +0,0 @@
-//===------------------------ optional.cpp --------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#include "experimental/optional"
-
-namespace std  // purposefully not using versioning namespace
-{ namespace experimental {
-
-#ifdef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
-
-bad_optional_access::~bad_optional_access() _NOEXCEPT {}
-
-#else
-
-bad_optional_access::~bad_optional_access() _NOEXCEPT = default;
-
-#endif
-
-}}  // std::experimental
--- a/src/random.cpp
+++ b/src/random.cpp
@@ -7,45 +7,18 @@
 //
 //===----------------------------------------------------------------------===//

-#if defined(_WIN32)
-// Must be defined before including stdlib.h to enable rand_s().
-#define _CRT_RAND_S
-#include <stdio.h>
-#endif
-
 #include "random"
 #include "system_error"

 #ifdef __sun__
 #define rename solaris_headers_are_broken
 #endif
-#if !defined(_WIN32)
 #include <fcntl.h>
 #include <unistd.h>
-#endif // defined(_WIN32)
 #include <errno.h>

 _LIBCPP_BEGIN_NAMESPACE_STD

-#if defined(_WIN32)
-random_device::random_device(const string&)
-{
-}
-
-random_device::~random_device()
-{
-}
-
-unsigned
-random_device::operator()()
-{
-    unsigned r;
-    errno_t err = rand_s(&r);
-    if (err)
-        __throw_system_error(err, "random_device rand_s failed.");
-    return r;
-}
-#else
 random_device::random_device(const string& __token)
    : __f_(open(__token.c_str(), O_RDONLY))
 {
@@ -65,7 +38,6 @@ random_device::operator()()
    read(__f_, &r, sizeof(r));
    return r;
 }
-#endif // defined(_WIN32)

 double
 random_device::entropy() const _NOEXCEPT
--- a/Show More
+++ b/Show More