Implement string_view from the library fundamentals TS (n4023). Also works in C++11 and 03, with reduced functionality (mostly in the area of constexpr)

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@210659 91177308-0d34-0410-b5e6-96231b3b80d8

include/experimental/string_view

@@ -0,0 +1,813 @@
+// -*- C++ -*-
+//===------------------------ string_view ---------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_LFTS_STRING_VIEW
+#define _LIBCPP_LFTS_STRING_VIEW
+
+/*
+string_view synopsis
+
+namespace std {
+ namespace experimental {
+  inline namespace library_fundamentals_v1 {
+
+    // 7.2, Class template basic_string_view
+    template<class charT, class traits = char_traits<charT>>
+        class basic_string_view;
+
+    // 7.9, basic_string_view non-member comparison functions
+    template<class charT, class traits>
+    constexpr bool operator==(basic_string_view<charT, traits> x,
+                              basic_string_view<charT, traits> y) noexcept;
+    template<class charT, class traits>
+    constexpr bool operator!=(basic_string_view<charT, traits> x,
+                              basic_string_view<charT, traits> y) noexcept;
+    template<class charT, class traits>
+    constexpr bool operator< (basic_string_view<charT, traits> x,
+                                 basic_string_view<charT, traits> y) noexcept;
+    template<class charT, class traits>
+    constexpr bool operator> (basic_string_view<charT, traits> x,
+                              basic_string_view<charT, traits> y) noexcept;
+    template<class charT, class traits>
+    constexpr bool operator<=(basic_string_view<charT, traits> x,
+                                 basic_string_view<charT, traits> y) noexcept;
+    template<class charT, class traits>
+    constexpr bool operator>=(basic_string_view<charT, traits> x,
+                              basic_string_view<charT, traits> y) noexcept;
+    // see below, sufficient additional overloads of comparison functions
+
+    // 7.10, Inserters and extractors
+    template<class charT, class traits>
+      basic_ostream<charT, traits>&
+        operator<<(basic_ostream<charT, traits>& os,
+                   basic_string_view<charT, traits> str);
+
+    // basic_string_view typedef names
+    typedef basic_string_view<char> string_view;
+    typedef basic_string_view<char16_t> u16string_view;
+    typedef basic_string_view<char32_t> u32string_view;
+    typedef basic_string_view<wchar_t> wstring_view;
+
+  }  // namespace fundamentals_v1
+ }  // namespace experimental
+
+  // 7.11, Hash support
+  template <class T> struct hash;
+  template <> struct hash<experimental::string_view>;
+  template <> struct hash<experimental::u16string_view>;
+  template <> struct hash<experimental::u32string_view>;
+  template <> struct hash<experimental::wstring_view>;
+
+}  // namespace std
+
+
+template<class charT, class traits = char_traits<charT>>
+class basic_string_view {
+  public:
+  // types
+  typedef traits traits_type;
+  typedef charT value_type;
+  typedef charT* pointer;
+  typedef const charT* const_pointer;
+  typedef charT& reference;
+  typedef const charT& const_reference;
+  typedef implementation-defined const_iterator; // See 7.4
+  typedef const_iterator iterator;22) Because basic_string_view refers to a constant sequence, iterator and const_iterator are the same type.
+  typedef reverse_iterator<const_iterator> const_reverse_iterator;
+  typedef const_reverse_iterator reverse_iterator;
+  typedef size_t size_type;
+  typedef ptrdiff_t difference_type;
+  static constexpr size_type npos = size_type(-1);
+
+  // 7.3, basic_string_view constructors and assignment operators
+  constexpr basic_string_view() noexcept;
+  constexpr basic_string_view(const basic_string_view&) noexcept = default;
+  basic_string_view& operator=(const basic_string_view&) noexcept = default;
+  template<class Allocator>
+  basic_string_view(const basic_string<charT, traits, Allocator>& str) noexcept;
+  constexpr basic_string_view(const charT* str);
+  constexpr basic_string_view(const charT* str, size_type len);
+
+  // 7.4, basic_string_view iterator support
+  constexpr const_iterator begin() const noexcept;
+  constexpr const_iterator end() const noexcept;
+  constexpr const_iterator cbegin() const noexcept;
+  constexpr const_iterator cend() const noexcept;
+  const_reverse_iterator rbegin() const noexcept;
+  const_reverse_iterator rend() const noexcept;
+  const_reverse_iterator crbegin() const noexcept;
+  const_reverse_iterator crend() const noexcept;
+
+  // 7.5, basic_string_view capacity
+  constexpr size_type size() const noexcept;
+  constexpr size_type length() const noexcept;
+  constexpr size_type max_size() const noexcept;
+  constexpr bool empty() const noexcept;
+
+  // 7.6, basic_string_view element access
+  constexpr const_reference operator[](size_type pos) const;
+  constexpr const_reference at(size_type pos) const;
+  constexpr const_reference front() const;
+  constexpr const_reference back() const;
+  constexpr const_pointer data() const noexcept;
+
+  // 7.7, basic_string_view modifiers
+  constexpr void clear() noexcept;
+  constexpr void remove_prefix(size_type n);
+  constexpr void remove_suffix(size_type n);
+  constexpr void swap(basic_string_view& s) noexcept;
+
+  // 7.8, basic_string_view string operations
+  template<class Allocator>
+  explicit operator basic_string<charT, traits, Allocator>() const;
+  template<class Allocator = allocator<charT>>
+  basic_string<charT, traits, Allocator> to_string(
+    const Allocator& a = Allocator()) const;
+
+  size_type copy(charT* s, size_type n, size_type pos = 0) const;
+
+  constexpr basic_string_view substr(size_type pos = 0, size_type n = npos) const;
+  constexpr int compare(basic_string_view s) const noexcept;
+  constexpr int compare(size_type pos1, size_type n1, basic_string_view s) const;
+  constexpr int compare(size_type pos1, size_type n1,
+                        basic_string_view s, size_type pos2, size_type n2) const;
+  constexpr int compare(const charT* s) const;
+  constexpr int compare(size_type pos1, size_type n1, const charT* s) const;
+  constexpr int compare(size_type pos1, size_type n1,
+                        const charT* s, size_type n2) const;
+  constexpr size_type find(basic_string_view s, size_type pos = 0) const noexcept;
+  constexpr size_type find(charT c, size_type pos = 0) const noexcept;
+  constexpr size_type find(const charT* s, size_type pos, size_type n) const;
+  constexpr size_type find(const charT* s, size_type pos = 0) const;
+  constexpr size_type rfind(basic_string_view s, size_type pos = npos) const noexcept;
+  constexpr size_type rfind(charT c, size_type pos = npos) const noexcept;
+  constexpr size_type rfind(const charT* s, size_type pos, size_type n) const;
+  constexpr size_type rfind(const charT* s, size_type pos = npos) const;
+  constexpr size_type find_first_of(basic_string_view s, size_type pos = 0) const noexcept;
+  constexpr size_type find_first_of(charT c, size_type pos = 0) const noexcept;
+  constexpr size_type find_first_of(const charT* s, size_type pos, size_type n) const;
+  constexpr size_type find_first_of(const charT* s, size_type pos = 0) const;
+  constexpr size_type find_last_of(basic_string_view s, size_type pos = npos) const noexcept;
+  constexpr size_type find_last_of(charT c, size_type pos = npos) const noexcept;
+  constexpr size_type find_last_of(const charT* s, size_type pos, size_type n) const;
+  constexpr size_type find_last_of(const charT* s, size_type pos = npos) const;
+  constexpr size_type find_first_not_of(basic_string_view s, size_type pos = 0) const noexcept;
+  constexpr size_type find_first_not_of(charT c, size_type pos = 0) const noexcept;
+  constexpr size_type find_first_not_of(const charT* s, size_type pos, size_type n) const;
+  constexpr size_type find_first_not_of(const charT* s, size_type pos = 0) const;
+  constexpr size_type find_last_not_of(basic_string_view s, size_type pos = npos) const noexcept;
+  constexpr size_type find_last_not_of(charT c, size_type pos = npos) const noexcept;
+  constexpr size_type find_last_not_of(const charT* s, size_type pos, size_type n) const;
+  constexpr size_type find_last_not_of(const charT* s, size_type pos = npos) const;
+
+ private:
+  const_pointer data_;  // exposition only
+  size_type     size_;  // exposition only
+};
+
+
+*/
+
+#include <__config>
+
+#include <string>
+#include <algorithm>
+#include <iterator>
+#include <ostream>
+#include <iomanip>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+namespace std {
+ namespace experimental {
+  inline namespace library_fundamentals_v1 {
+    
+    template<class _CharT, class _Traits = _VSTD::char_traits<_CharT> >
+    class _LIBCPP_TYPE_VIS_ONLY basic_string_view {
+    public:
+        // types
+        typedef _Traits                                    traits_type;
+        typedef _CharT                                     value_type;
+        typedef const _CharT*                              pointer;
+        typedef const _CharT*                              const_pointer;
+        typedef const _CharT&                              reference;
+        typedef const _CharT&                              const_reference;
+        typedef const_pointer                              const_iterator; // See [string.view.iterators]
+        typedef const_iterator                             iterator;
+        typedef _VSTD::reverse_iterator<const_iterator>    const_reverse_iterator;
+        typedef const_reverse_iterator                     reverse_iterator;
+        typedef size_t                                     size_type;
+        typedef ptrdiff_t                                  difference_type;
+        static _LIBCPP_CONSTEXPR const size_type npos = -1; // size_type(-1);
+
+        // [string.view.cons], construct/copy
+        _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+        basic_string_view() _NOEXCEPT : __data (nullptr), __size(0) {}
+
+        _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+        basic_string_view(const basic_string_view&) _NOEXCEPT = default;
+        
+        _LIBCPP_INLINE_VISIBILITY
+        basic_string_view& operator=(const basic_string_view&) _NOEXCEPT = default;
+
+        template<class _Allocator>
+        _LIBCPP_INLINE_VISIBILITY
+        basic_string_view(const basic_string<_CharT, _Traits, _Allocator>& __str) _NOEXCEPT
+            : __data (__str.data()), __size(__str.size()) {}
+
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        basic_string_view(const _CharT* __s, size_type __len)
+            : __data(__s), __size(__len)
+        {
+            _LIBCPP_ASSERT(__len == 0 || __s != nullptr, "string_view::string_view(_CharT *, size_t): recieved nullptr");
+        }
+            
+        _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+        basic_string_view(const _CharT* __s)
+            : __data(__s), __size(_Traits::length(__s)) {}
+
+        // [string.view.iterators], iterators
+        _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+        const_iterator begin()  const _NOEXCEPT { return cbegin(); }
+        
+        _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+        const_iterator end()    const _NOEXCEPT { return cend(); }
+        
+        _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+        const_iterator cbegin() const _NOEXCEPT { return __data; }
+        
+        _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+        const_iterator cend()   const _NOEXCEPT { return __data + __size; }
+
+        _LIBCPP_INLINE_VISIBILITY
+        const_reverse_iterator rbegin()   const _NOEXCEPT { return const_reverse_iterator(cend()); }
+        
+        _LIBCPP_INLINE_VISIBILITY
+        const_reverse_iterator rend()     const _NOEXCEPT { return const_reverse_iterator(cbegin()); }
+        
+        _LIBCPP_INLINE_VISIBILITY
+        const_reverse_iterator crbegin()  const _NOEXCEPT { return const_reverse_iterator(cend()); }
+        
+        _LIBCPP_INLINE_VISIBILITY
+        const_reverse_iterator crend()    const _NOEXCEPT { return const_reverse_iterator(cbegin()); }
+
+        // [string.view.capacity], capacity
+        _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+        size_type size()     const _NOEXCEPT { return __size; }
+        
+        _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+        size_type length()   const _NOEXCEPT { return __size; }
+        
+        _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+        size_type max_size() const _NOEXCEPT { return _VSTD::numeric_limits<size_type>::max(); }
+        
+        _LIBCPP_CONSTEXPR bool _LIBCPP_INLINE_VISIBILITY
+        empty()         const _NOEXCEPT { return __size == 0; }
+
+        // [string.view.access], element access
+        _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+        const_reference operator[](size_type __pos) const { return __data[__pos]; }
+        
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        const_reference at(size_type __pos) const
+        {
+            if (__pos >= size())
+                throw out_of_range("string_view::at");
+            return __data[__pos]; 
+        }
+
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        const_reference front() const
+        {
+            _LIBCPP_ASSERT(!empty(), "string_view::front(): string is empty");
+            return __data[0];
+        }
+        
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        const_reference back() const
+        {
+            _LIBCPP_ASSERT(!empty(), "string_view::back(): string is empty");
+            return __data[__size-1];
+        }
+
+        _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+        const_pointer data() const _NOEXCEPT { return __data; }
+
+        // [string.view.modifiers], modifiers:
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        void clear() _NOEXCEPT
+        {
+            __data = nullptr;
+            __size = 0;
+        }
+        
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        void remove_prefix(size_type __n) _NOEXCEPT
+        {
+            if (__n > __size)
+                __n = __size;
+            __data += __n;
+            __size -= __n;
+        }
+            
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        void remove_suffix(size_type __n) _NOEXCEPT
+        {
+            if (__n > __size)
+                __n = __size;
+            __size -= __n;
+        }
+
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        void swap(basic_string_view& __other) _NOEXCEPT
+        {
+        	const value_type *__p = __data;
+        	__data = __other.__data;
+        	__other.__data = __p;
+        	
+        	size_type __sz = __size;
+        	__size = __other.__size;
+        	__other.__size = __sz;
+//             _VSTD::swap( __data, __other.__data );
+//             _VSTD::swap( __size, __other.__size );
+        }
+                    
+        // [string.view.ops], string operations:
+        template<class _Allocator>
+        _LIBCPP_INLINE_VISIBILITY
+        _LIBCPP_EXPLICIT operator basic_string<_CharT, _Traits, _Allocator>() const
+        { return basic_string<_CharT, _Traits, _Allocator>( begin(), end()); }
+        
+        template<class _Allocator = allocator<_CharT> >
+        _LIBCPP_INLINE_VISIBILITY
+        basic_string<_CharT, _Traits, _Allocator> to_string( const _Allocator& __a = _Allocator())
+        { return basic_string<_CharT, _Traits, _Allocator> ( begin(), end(), __a ); }
+
+        size_type copy(_CharT* __s, size_type __n, size_type __pos = 0) const
+        {
+            if ( __pos > size())
+                throw out_of_range("string_view::copy");
+            size_type __rlen = _VSTD::min( __n, size() - __pos );
+            _VSTD::copy_n(begin() + __pos, __rlen, __s );
+            return __rlen;
+        }
+        
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 basic_string_view substr(size_type __pos = 0, size_type __n = npos) const
+        {
+            if (__pos > size())
+                throw out_of_range("string_view::substr");
+            size_type __rlen = _VSTD::min( __n, size() - __pos );
+            return basic_string_view(data() + __pos, __rlen);
+        }
+
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 int compare(basic_string_view __sv) const _NOEXCEPT
+        {
+            size_type __rlen = _VSTD::min( size(), __sv.size());
+            int __retval = _Traits::compare(data(), __sv.data(), __rlen);
+            if ( __retval == 0 ) // first __rlen chars matched
+                __retval = size() == __sv.size() ? 0 : ( size() < __sv.size() ? -1 : 1 );
+            return __retval;
+        }
+        
+        _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+        int compare(size_type __pos1, size_type __n1, basic_string_view __sv) const
+        {
+            return substr(__pos1, __n1).compare(__sv);
+        }
+
+        _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+        int compare(                       size_type __pos1, size_type __n1, 
+                    basic_string_view _sv, size_type __pos2, size_type __n2) const
+        {
+            return substr(__pos1, __n1).compare(_sv.substr(__pos2, __n2));
+        }
+        
+        _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+        int compare(const _CharT* __s) const
+        {
+            return compare(basic_string_view(__s));
+        }
+        
+        _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+        int compare(size_type __pos1, size_type __n1, const _CharT* __s) const
+        {
+            return substr(__pos1, __n1).compare(basic_string_view(__s));
+        }
+        
+        _LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+        int compare(size_type __pos1, size_type __n1, const _CharT* __s, size_type __n2) const
+        {
+            return substr(__pos1, __n1).compare(basic_string_view(__s, __n2));
+        }
+
+        // find
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type find(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT
+        {
+            _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find(): recieved nullptr");
+            return _VSTD::__str_find<value_type, size_type, traits_type, npos>
+                (data(), size(), __s.data(), __pos, __s.size());
+        }
+        
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type find(_CharT __c, size_type __pos = 0) const _NOEXCEPT
+        {
+            return _VSTD::__str_find<value_type, size_type, traits_type, npos>
+                (data(), size(), __c, __pos);
+        }
+        
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type find(const _CharT* __s, size_type __pos, size_type __n) const
+        {
+            _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find(): recieved nullptr");
+            return _VSTD::__str_find<value_type, size_type, traits_type, npos>
+                (data(), size(), __s, __pos, __n);
+        }
+        
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type find(const _CharT* __s, size_type __pos = 0) const
+        {
+            _LIBCPP_ASSERT(__s != nullptr, "string_view::find(): recieved nullptr");
+            return _VSTD::__str_find<value_type, size_type, traits_type, npos>
+                (data(), size(), __s, __pos, traits_type::length(__s));
+        }
+
+        // rfind
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type rfind(basic_string_view __s, size_type __pos = npos) const _NOEXCEPT
+        {
+            _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find(): recieved nullptr");
+            return _VSTD::__str_rfind<value_type, size_type, traits_type, npos>
+                (data(), size(), __s.data(), __pos, __s.size());
+        }
+        
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type rfind(_CharT __c, size_type __pos = npos) const _NOEXCEPT
+        {
+            return _VSTD::__str_rfind<value_type, size_type, traits_type, npos>
+                (data(), size(), __c, __pos);
+        }
+
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type rfind(const _CharT* __s, size_type __pos, size_type __n) const
+        {
+            _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::rfind(): recieved nullptr");
+            return _VSTD::__str_rfind<value_type, size_type, traits_type, npos>
+                (data(), size(), __s, __pos, __n);
+        }
+
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type rfind(const _CharT* __s, size_type __pos=npos) const
+        {
+            _LIBCPP_ASSERT(__s != nullptr, "string_view::rfind(): recieved nullptr");
+            return _VSTD::__str_rfind<value_type, size_type, traits_type, npos>
+                (data(), size(), __s, __pos, traits_type::length(__s));
+        }
+
+        // find_first_of
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type find_first_of(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT
+        {
+            _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_first_of(): recieved nullptr");
+            return _VSTD::__str_find_first_of<value_type, size_type, traits_type, npos>
+                (data(), size(), __s.data(), __pos, __s.size());
+        }
+    
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type find_first_of(_CharT __c, size_type __pos = 0) const _NOEXCEPT
+        { return find(__c, __pos); }
+        
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type find_first_of(const _CharT* __s, size_type __pos, size_type __n) const
+        {
+            _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_first_of(): recieved nullptr");
+            return _VSTD::__str_find_first_of<value_type, size_type, traits_type, npos>
+                (data(), size(), __s, __pos, __n);
+        }
+        
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type find_first_of(const _CharT* __s, size_type __pos=0) const
+        {
+            _LIBCPP_ASSERT(__s != nullptr, "string_view::find_first_of(): recieved nullptr");
+            return _VSTD::__str_find_first_of<value_type, size_type, traits_type, npos>
+                (data(), size(), __s, __pos, traits_type::length(__s));
+        }
+
+        // find_last_of
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type find_last_of(basic_string_view __s, size_type __pos=npos) const _NOEXCEPT
+        {
+            _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_last_of(): recieved nullptr");
+            return _VSTD::__str_find_last_of<value_type, size_type, traits_type, npos>
+                (data(), size(), __s.data(), __pos, __s.size());
+        }
+        
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type find_last_of(_CharT __c, size_type __pos = npos) const _NOEXCEPT
+        { return rfind(__c, __pos); }
+        
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type find_last_of(const _CharT* __s, size_type __pos, size_type __n) const
+        {
+            _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_last_of(): recieved nullptr");
+            return _VSTD::__str_find_last_of<value_type, size_type, traits_type, npos>
+                (data(), size(), __s, __pos, __n);
+        }
+
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type find_last_of(const _CharT* __s, size_type __pos=npos) const
+        {
+            _LIBCPP_ASSERT(__s != nullptr, "string_view::find_last_of(): recieved nullptr");
+            return _VSTD::__str_find_last_of<value_type, size_type, traits_type, npos>
+                (data(), size(), __s, __pos, traits_type::length(__s));
+        }
+
+        // find_first_not_of
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type find_first_not_of(basic_string_view __s, size_type __pos=0) const _NOEXCEPT
+        {
+            _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_first_not_of(): recieved nullptr");
+            return _VSTD::__str_find_first_not_of<value_type, size_type, traits_type, npos>
+                (data(), size(), __s.data(), __pos, __s.size());
+        }
+        
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type find_first_not_of(_CharT __c, size_type __pos=0) const _NOEXCEPT
+        {
+            return _VSTD::__str_find_first_not_of<value_type, size_type, traits_type, npos>
+                (data(), size(), __c, __pos);
+        }
+
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const
+        {
+            _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_first_not_of(): recieved nullptr");
+            return _VSTD::__str_find_first_not_of<value_type, size_type, traits_type, npos>
+                (data(), size(), __s, __pos, __n);
+        }
+
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type find_first_not_of(const _CharT* __s, size_type __pos=0) const
+        {
+            _LIBCPP_ASSERT(__s != nullptr, "string_view::find_first_not_of(): recieved nullptr");
+            return _VSTD::__str_find_first_not_of<value_type, size_type, traits_type, npos>
+                (data(), size(), __s, __pos, traits_type::length(__s));
+        }
+        
+        // find_last_not_of
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type find_last_not_of(basic_string_view __s, size_type __pos=npos) const _NOEXCEPT
+        {
+            _LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_last_not_of(): recieved nullptr");
+            return _VSTD::__str_find_last_not_of<value_type, size_type, traits_type, npos>
+                (data(), size(), __s.data(), __pos, __s.size());
+        }       
+        
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type find_last_not_of(_CharT __c, size_type __pos=npos) const _NOEXCEPT
+        {
+            return _VSTD::__str_find_last_not_of<value_type, size_type, traits_type, npos>
+                (data(), size(), __c, __pos);
+        }
+        
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const
+        {
+            _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_last_not_of(): recieved nullptr");
+            return _VSTD::__str_find_last_not_of<value_type, size_type, traits_type, npos>
+                (data(), size(), __s, __pos, __n);
+        }
+
+        _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+        size_type find_last_not_of(const _CharT* __s, size_type __pos=npos) const
+        {
+            _LIBCPP_ASSERT(__s != nullptr, "string_view::find_last_not_of(): recieved nullptr");
+            return _VSTD::__str_find_last_not_of<value_type, size_type, traits_type, npos>
+                (data(), size(), __s, __pos, traits_type::length(__s));
+        }
+
+    private:   
+        const   value_type* __data;
+        size_type           __size;
+    };
+
+
+    // [string.view.comparison]
+    // operator ==
+    template<class _CharT, class _Traits>
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+    bool operator==(basic_string_view<_CharT, _Traits> __lhs,
+                    basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+    {
+        if ( __lhs.size() != __rhs.size()) return false;
+        return __lhs.compare(__rhs) == 0;
+    }
+
+    template<class _CharT, class _Traits>
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+    bool operator==(basic_string_view<_CharT, _Traits> __lhs,
+                    typename _VSTD::common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
+    {
+        if ( __lhs.size() != __rhs.size()) return false;
+        return __lhs.compare(__rhs) == 0;
+    }
+
+    template<class _CharT, class _Traits>
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+    bool operator==(typename _VSTD::common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 
+                    basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+    {
+        if ( __lhs.size() != __rhs.size()) return false;
+        return __lhs.compare(__rhs) == 0;
+    }
+
+
+    // operator !=
+    template<class _CharT, class _Traits>
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+    bool operator!=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+    {
+        if ( __lhs.size() != __rhs.size())
+            return true;
+        return __lhs.compare(__rhs) != 0;
+    }
+  
+    template<class _CharT, class _Traits>
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+    bool operator!=(basic_string_view<_CharT, _Traits> __lhs,
+                    typename _VSTD::common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
+    {
+        if ( __lhs.size() != __rhs.size())
+            return true;
+        return __lhs.compare(__rhs) != 0;
+    }
+
+    template<class _CharT, class _Traits>
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+    bool operator!=(typename _VSTD::common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 
+                    basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+    {
+        if ( __lhs.size() != __rhs.size())
+            return true;
+        return __lhs.compare(__rhs) != 0;
+    }
+
+
+    // operator <
+    template<class _CharT, class _Traits>
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+    bool operator<(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+    {
+        return __lhs.compare(__rhs) < 0;
+    }
+
+    template<class _CharT, class _Traits>
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+    bool operator<(basic_string_view<_CharT, _Traits> __lhs,
+                    typename _VSTD::common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
+    {
+        return __lhs.compare(__rhs) < 0;
+    }
+
+    template<class _CharT, class _Traits>
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+    bool operator<(typename _VSTD::common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 
+                    basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+    {
+        return __lhs.compare(__rhs) < 0;
+    }
+
+
+    // operator >
+    template<class _CharT, class _Traits>
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+    bool operator> (basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+    {
+        return __lhs.compare(__rhs) > 0;
+    }
+
+    template<class _CharT, class _Traits>
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+    bool operator>(basic_string_view<_CharT, _Traits> __lhs,
+                    typename _VSTD::common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
+    {
+        return __lhs.compare(__rhs) > 0;
+    }
+
+    template<class _CharT, class _Traits>
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+    bool operator>(typename _VSTD::common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 
+                    basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+    {
+        return __lhs.compare(__rhs) > 0;
+    }
+
+
+    // operator <=
+    template<class _CharT, class _Traits>
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+    bool operator<=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+    {
+        return __lhs.compare(__rhs) <= 0;
+    }
+
+    template<class _CharT, class _Traits>
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+    bool operator<=(basic_string_view<_CharT, _Traits> __lhs,
+                    typename _VSTD::common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
+    {
+        return __lhs.compare(__rhs) <= 0;
+    }
+
+    template<class _CharT, class _Traits>
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+    bool operator<=(typename _VSTD::common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 
+                    basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+    {
+        return __lhs.compare(__rhs) <= 0;
+    }
+
+
+    // operator >=
+    template<class _CharT, class _Traits>
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+    bool operator>=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+    {
+        return __lhs.compare(__rhs) >= 0;
+    }
+
+
+    template<class _CharT, class _Traits>
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+    bool operator>=(basic_string_view<_CharT, _Traits> __lhs,
+                    typename _VSTD::common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
+    {
+        return __lhs.compare(__rhs) >= 0;
+    }
+
+    template<class _CharT, class _Traits>
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+    bool operator>=(typename _VSTD::common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 
+                    basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+    {
+        return __lhs.compare(__rhs) >= 0;
+    }
+
+
+    // [string.view.io]
+    template<class _CharT, class _Traits>
+    basic_ostream<_CharT, _Traits>&
+    operator<<(basic_ostream<_CharT, _Traits>& __os, basic_string_view<_CharT, _Traits> __sv)
+    {
+        return _VSTD::__put_character_sequence(__os, __sv.data(), __sv.size());
+    }
+
+  typedef basic_string_view<char>     string_view;
+  typedef basic_string_view<char16_t> u16string_view;
+  typedef basic_string_view<char32_t> u32string_view;
+  typedef basic_string_view<wchar_t>  wstring_view;
+
+}}}  // close std::experimental::library_fundamentals_v1
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+// [string.view.hash]
+// Shamelessly stolen from <string>
+template<class _CharT, class _Traits>
+struct _LIBCPP_TYPE_VIS_ONLY hash<std::experimental::basic_string_view<_CharT, _Traits> >
+    : public unary_function<std::experimental::basic_string_view<_CharT, _Traits>, size_t>
+{
+    size_t operator()(const std::experimental::basic_string_view<_CharT, _Traits>& __val) const _NOEXCEPT;
+};
+
+template<class _CharT, class _Traits>
+size_t
+hash<std::experimental::basic_string_view<_CharT, _Traits> >::operator()(
+        const std::experimental::basic_string_view<_CharT, _Traits>& __val) const _NOEXCEPT
+{
+    return __do_string_hash(__val.data(), __val.data() + __val.size());
+}
+
+#if _LIBCPP_STD_VER > 11
+template <class _CharT, class _Traits>
+__quoted_output_proxy<_CharT, const _CharT *, _Traits>
+quoted ( std::experimental::basic_string_view <_CharT, _Traits> __sv,
+             _CharT __delim = _CharT('"'), _CharT __escape=_CharT('\\'))
+{
+    return __quoted_output_proxy<_CharT, const _CharT *, _Traits> 
+         ( __sv.data(), __sv.data() + __sv.size(), __delim, __escape );
+}
+#endif
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_LFTS_STRING_VIEW

test/experimental/nothing_to_do.pass.cpp

@@ -0,0 +1,12 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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/string_view>
+
+int main () {}

test/experimental/string.view/nothing_to_do.pass.cpp

@@ -0,0 +1,12 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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/string_view>
+
+int main () {}

test/experimental/string.view/string.view.access/at.pass.cpp

@@ -0,0 +1,54 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// constexpr const _CharT& at(size_type _pos) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+template <typename CharT>
+void test ( const CharT *s, size_t len ) {
+    std::experimental::basic_string_view<CharT> sv ( s, len );
+    assert ( sv.length() == len );
+    for ( size_t i = 0; i < len; ++i ) {
+        assert (  sv.at(i) == s[i] );
+        assert ( &sv.at(i) == s + i );
+        }
+
+    try { sv.at(len); } catch ( const std::out_of_range & ) { return ; }
+    assert ( false );
+    }
+    
+int main () {
+    test ( "ABCDE", 5 );
+    test ( "a", 1 );
+
+    test ( L"ABCDE", 5 );
+    test ( L"a", 1 );
+
+#if __cplusplus >= 201103L
+    test ( u"ABCDE", 5 );
+    test ( u"a", 1 );
+
+    test ( U"ABCDE", 5 );
+    test ( U"a", 1 );
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr std::experimental::basic_string_view<char> sv ( "ABC", 2 );
+    static_assert ( sv.length() ==  2,  "" );
+    static_assert ( sv.at(0) == 'A', "" );
+    static_assert ( sv.at(1) == 'B', "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.access/back.pass.cpp

@@ -0,0 +1,48 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// constexpr const _CharT& front();
+
+#include <experimental/string_view>
+#include <cassert>
+
+template <typename CharT>
+bool test ( const CharT *s, size_t len ) {
+    std::experimental::basic_string_view<CharT> sv ( s, len );
+    assert ( sv.length() == len );
+    assert ( sv.back() == s[len-1] );
+    return &sv.back() == s + len - 1;
+    }
+    
+int main () {
+    assert ( test ( "ABCDE", 5 ));
+    assert ( test ( "a", 1 ));
+
+    assert ( test ( L"ABCDE", 5 ));
+    assert ( test ( L"a", 1 ));
+
+#if __cplusplus >= 201103L
+    assert ( test ( u"ABCDE", 5 ));
+    assert ( test ( u"a", 1 ));
+
+    assert ( test ( U"ABCDE", 5 ));
+    assert ( test ( U"a", 1 ));
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr std::experimental::basic_string_view<char> sv ( "ABC", 2 );
+    static_assert ( sv.length() ==  2,  "" );
+    static_assert ( sv.back()  == 'B', "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.access/data.pass.cpp

@@ -0,0 +1,48 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// constexpr const _CharT* data() const noexcept;
+
+#include <experimental/string_view>
+#include <cassert>
+
+template <typename CharT>
+void test ( const CharT *s, size_t len ) {
+    std::experimental::basic_string_view<CharT> sv ( s, len );
+    assert ( sv.length() == len );
+    assert ( sv.data() == s );
+    }
+    
+int main () {
+    test ( "ABCDE", 5 );
+    test ( "a", 1 );
+
+    test ( L"ABCDE", 5 );
+    test ( L"a", 1 );
+
+#if __cplusplus >= 201103L
+    test ( u"ABCDE", 5 );
+    test ( u"a", 1 );
+
+    test ( U"ABCDE", 5 );
+    test ( U"a", 1 );
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr const char *s = "ABC";
+    constexpr std::experimental::basic_string_view<char> sv( s, 2 );
+    static_assert( sv.length() ==  2,  "" );
+    static_assert( sv.data() == s, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.access/front.pass.cpp

@@ -0,0 +1,48 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// constexpr const _CharT& back();
+
+#include <experimental/string_view>
+#include <cassert>
+
+template <typename CharT>
+bool test ( const CharT *s, size_t len ) {
+    std::experimental::basic_string_view<CharT> sv ( s, len );
+    assert ( sv.length() == len );
+    assert ( sv.front() == s[0] );
+    return &sv.front() == s;
+    }
+    
+int main () {
+    assert ( test ( "ABCDE", 5 ));
+    assert ( test ( "a", 1 ));
+
+    assert ( test ( L"ABCDE", 5 ));
+    assert ( test ( L"a", 1 ));
+
+#if __cplusplus >= 201103L
+    assert ( test ( u"ABCDE", 5 ));
+    assert ( test ( u"a", 1 ));
+
+    assert ( test ( U"ABCDE", 5 ));
+    assert ( test ( U"a", 1 ));
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr std::experimental::basic_string_view<char> sv ( "ABC", 2 );
+    static_assert ( sv.length() ==  2,  "" );
+    static_assert ( sv.front()  == 'A', "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.access/index.pass.cpp

@@ -0,0 +1,51 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// constexpr const _CharT& operator[](size_type _pos) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+template <typename CharT>
+void test ( const CharT *s, size_t len ) {
+    std::experimental::basic_string_view<CharT> sv ( s, len );
+    assert ( sv.length() == len );
+    for ( size_t i = 0; i < len; ++i ) {
+        assert ( sv[i] == s[i] );
+        assert ( &sv[i] == s + i );
+        }
+    }
+    
+int main () {
+    test ( "ABCDE", 5 );
+    test ( "a", 1 );
+
+    test ( L"ABCDE", 5 );
+    test ( L"a", 1 );
+
+#if __cplusplus >= 201103L
+    test ( u"ABCDE", 5 );
+    test ( u"a", 1 );
+
+    test ( U"ABCDE", 5 );
+    test ( U"a", 1 );
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr std::experimental::basic_string_view<char> sv ( "ABC", 2 );
+    static_assert ( sv.length() ==  2,  "" );
+    static_assert ( sv[0]  == 'A', "" );
+    static_assert ( sv[1]  == 'B', "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.capacity/capacity.pass.cpp

@@ -0,0 +1,87 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// [string.view.capacity], capacity
+// constexpr size_type size()     const noexcept;
+// constexpr size_type length()   const noexcept;
+// constexpr size_type max_size() const noexcept;
+// constexpr bool empty()         const noexcept;
+
+#include <experimental/string_view>
+#include <cassert>
+
+template<typename SV>
+void test1 () {
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr SV sv1;
+    static_assert ( sv1.size() == 0, "" );
+    static_assert ( sv1.empty(), "");
+    static_assert ( sv1.size() == sv1.length(), "" );
+    static_assert ( sv1.max_size() > sv1.size(), "");
+    }
+#endif
+    
+    {
+    SV sv1;
+    assert ( sv1.size() == 0 );
+    assert ( sv1.empty());
+    assert ( sv1.size() == sv1.length());
+    assert ( sv1.max_size() > sv1.size());
+    }
+}
+
+template<typename CharT>
+void test2 ( const CharT *s, size_t len ) {
+    {
+    std::experimental::basic_string_view<CharT> sv1 ( s );
+    assert ( sv1.size() == len );
+    assert ( sv1.data() == s );
+    assert ( sv1.empty() == (len == 0));
+    assert ( sv1.size() == sv1.length());
+    assert ( sv1.max_size() > sv1.size());
+    }
+}
+
+int main () {
+    using string_view    = std::experimental::string_view;
+    using u16string_view = std::experimental::u16string_view;
+    using u32string_view = std::experimental::u32string_view;
+    using wstring_view   = std::experimental::wstring_view;
+
+    test1<string_view> ();
+    test1<u16string_view> ();
+    test1<u32string_view> ();
+    test1<wstring_view> ();
+
+    test2 ( "ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE", 105 );
+    test2 ( "ABCDE", 5 );
+    test2 ( "a", 1 );
+    test2 ( "", 0 );
+
+    test2 ( L"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE", 105 );
+    test2 ( L"ABCDE", 5 );
+    test2 ( L"a", 1 );
+    test2 ( L"", 0 );
+
+#if __cplusplus >= 201103L
+    test2 ( u"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE", 105 );
+    test2 ( u"ABCDE", 5 );
+    test2 ( u"a", 1 );
+    test2 ( u"", 0 );
+
+    test2 ( U"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE", 105 );
+    test2 ( U"ABCDE", 5 );
+    test2 ( U"a", 1 );
+    test2 ( U"", 0 );
+#endif
+}

test/experimental/string.view/string.view.comparison/opeq.string_view.pointer.pass.cpp

@@ -0,0 +1,68 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits>
+//   constexpr bool operator==(basic_string_view<charT,traits> lhs, const charT* rhs);
+// template<class charT, class traits>
+//   constexpr bool operator==(const charT* lhs, basic_string_view<charT,traits> rhs);
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(S lhs, const typename S::value_type* rhs, bool x)
+{
+    assert((lhs == rhs) == x);
+    assert((rhs == lhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test(S(""), "", true);
+    test(S(""), "abcde", false);
+    test(S(""), "abcdefghij", false);
+    test(S(""), "abcdefghijklmnopqrst", false);
+    test(S("abcde"), "", false);
+    test(S("abcde"), "abcde", true);
+    test(S("abcde"), "abcdefghij", false);
+    test(S("abcde"), "abcdefghijklmnopqrst", false);
+    test(S("abcdefghij"), "", false);
+    test(S("abcdefghij"), "abcde", false);
+    test(S("abcdefghij"), "abcdefghij", true);
+    test(S("abcdefghij"), "abcdefghijklmnopqrst", false);
+    test(S("abcdefghijklmnopqrst"), "", false);
+    test(S("abcdefghijklmnopqrst"), "abcde", false);
+    test(S("abcdefghijklmnopqrst"), "abcdefghij", false);
+    test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", true);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+    static_assert (  sv1     == "", "" );
+    static_assert (  ""      == sv1, "" );
+    static_assert (!(sv1     == "abcde"), "" );
+    static_assert (!("abcde" == sv1), "" );
+    
+    static_assert (  sv2      == "abcde", "" );
+    static_assert (  "abcde"  == sv2, "" );
+    static_assert (!(sv2      == "abcde0"), "" );
+    static_assert (!("abcde0" == sv2), "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.comparison/opeq.string_view.string.pass.cpp

@@ -0,0 +1,54 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   bool operator==(const charT* lhs, const basic_string<charT,traits> rhs);
+// template<class charT, class traits, class Allocator>
+//   bool operator==(const basic_string_view<charT,traits> lhs, const CharT* rhs);
+
+#include <experimental/string_view>
+#include <cassert>
+
+#if _LIBCPP_STD_VER > 11
+
+template <class S>
+void
+test(const std::string &lhs, S rhs, bool x)
+{
+    assert((lhs == rhs) == x);
+    assert((rhs == lhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test("", S(""), true);
+    test("", S("abcde"), false);
+    test("", S("abcdefghij"), false);
+    test("", S("abcdefghijklmnopqrst"), false);
+    test("abcde", S(""), false);
+    test("abcde", S("abcde"), true);
+    test("abcde", S("abcdefghij"), false);
+    test("abcde", S("abcdefghijklmnopqrst"), false);
+    test("abcdefghij", S(""), false);
+    test("abcdefghij", S("abcde"), false);
+    test("abcdefghij", S("abcdefghij"), true);
+    test("abcdefghij", S("abcdefghijklmnopqrst"), false);
+    test("abcdefghijklmnopqrst", S(""), false);
+    test("abcdefghijklmnopqrst", S("abcde"), false);
+    test("abcdefghijklmnopqrst", S("abcdefghij"), false);
+    test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), true);
+    }
+}
+#else
+int main () {}
+#endif

test/experimental/string.view/string.view.comparison/opeq.string_view.string_view.pass.cpp

@@ -0,0 +1,61 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// template<class charT, class traits, class Allocator>
+//   constexpr bool operator==(const basic_string_view<charT,traits> lhs,
+//                   const basic_string_view<charT,traits> rhs);
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(S lhs, S rhs, bool x)
+{
+    assert((lhs == rhs) == x);
+    assert((rhs == lhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test(S(""), S(""), true);
+    test(S(""), S("abcde"), false);
+    test(S(""), S("abcdefghij"), false);
+    test(S(""), S("abcdefghijklmnopqrst"), false);
+    test(S("abcde"), S(""), false);
+    test(S("abcde"), S("abcde"), true);
+    test(S("abcde"), S("abcdefghij"), false);
+    test(S("abcde"), S("abcdefghijklmnopqrst"), false);
+    test(S("abcdefghij"), S(""), false);
+    test(S("abcdefghij"), S("abcde"), false);
+    test(S("abcdefghij"), S("abcdefghij"), true);
+    test(S("abcdefghij"), S("abcdefghijklmnopqrst"), false);
+    test(S("abcdefghijklmnopqrst"), S(""), false);
+    test(S("abcdefghijklmnopqrst"), S("abcde"), false);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghij"), false);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), true);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2;
+    constexpr SV  sv3 { "abcde", 5 };
+    static_assert (  sv1 == sv2, "" );
+    static_assert (!(sv1 == sv3), "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.comparison/opge.string_view.pointer.pass.cpp

@@ -0,0 +1,71 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   constexpr bool operator>=(const charT* lhs, basic_string_wiew<charT,traits> rhs);
+// template<class charT, class traits, class Allocator>
+//   constexpr bool operator>=(basic_string_wiew<charT,traits> lhs, const charT* rhs);
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const typename S::value_type* lhs, const S& rhs, bool x, bool y)
+{
+    assert((lhs >= rhs) == x);
+    assert((rhs >= lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test("", S(""), true, true);
+    test("", S("abcde"), false, true);
+    test("", S("abcdefghij"), false, true);
+    test("", S("abcdefghijklmnopqrst"), false, true);
+    test("abcde", S(""), true, false);
+    test("abcde", S("abcde"), true, true);
+    test("abcde", S("abcdefghij"), false, true);
+    test("abcde", S("abcdefghijklmnopqrst"), false, true);
+    test("abcdefghij", S(""), true, false);
+    test("abcdefghij", S("abcde"), true, false);
+    test("abcdefghij", S("abcdefghij"), true, true);
+    test("abcdefghij", S("abcdefghijklmnopqrst"), false, true);
+    test("abcdefghijklmnopqrst", S(""), true, false);
+    test("abcdefghijklmnopqrst", S("abcde"), true, false);
+    test("abcdefghijklmnopqrst", S("abcdefghij"), true, false);
+    test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), true, true);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (  sv1     >= "", "" );
+    static_assert (  ""      >= sv1, "" );
+    static_assert (!(sv1     >= "abcde"), "" );
+    static_assert (  "abcde" >= sv1, "" );
+    
+    static_assert (  sv2      >= "", "" );
+    static_assert (!(""       >= sv2), "" );
+    static_assert (  sv2      >= "abcde", "" );
+    static_assert (  "abcde"  >= sv2, "" );
+    static_assert (!(sv2      >= "abcde0"), "" );
+    static_assert (  "abcde0" >= sv2, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.comparison/opge.string_view.string.pass.cpp

@@ -0,0 +1,50 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   bool operator>=(const basic_string<charT,traits,Allocator>& lhs,
+//                   basic_string_view<charT,traits> rhs);
+//   bool operator>=(basic_string_view<charT,traits> lhs,
+//            const basic_string<charT,traits,Allocator>&  rhs);
+
+#include <experimental/string_view>
+#include <cassert>
+
+template <class S>
+void
+test(const S& lhs, const typename S::value_type* rhs, bool x, bool y)
+{
+    assert((lhs >= rhs) == x);
+    assert((rhs >= lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test(S(""), "", true, true);
+    test(S(""), "abcde", false, true);
+    test(S(""), "abcdefghij", false, true);
+    test(S(""), "abcdefghijklmnopqrst", false, true);
+    test(S("abcde"), "", true, false);
+    test(S("abcde"), "abcde", true, true);
+    test(S("abcde"), "abcdefghij", false, true);
+    test(S("abcde"), "abcdefghijklmnopqrst", false, true);
+    test(S("abcdefghij"), "", true, false);
+    test(S("abcdefghij"), "abcde", true, false);
+    test(S("abcdefghij"), "abcdefghij", true, true);
+    test(S("abcdefghij"), "abcdefghijklmnopqrst", false, true);
+    test(S("abcdefghijklmnopqrst"), "", true, false);
+    test(S("abcdefghijklmnopqrst"), "abcde", true, false);
+    test(S("abcdefghijklmnopqrst"), "abcdefghij", true, false);
+    test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", true, true);
+    }
+}

test/experimental/string.view/string.view.comparison/opge.string_view.string_view.pass.cpp

@@ -0,0 +1,64 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits>
+//   constexpr bool operator>=(basic_string_view<charT,traits> lhs,
+//                  basic_string_view<charT,traits> rhs);
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& lhs, const S& rhs, bool x, bool y)
+{
+    assert((lhs >= rhs) == x);
+    assert((rhs >= lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test(S(""), S(""), true, true);
+    test(S(""), S("abcde"), false, true);
+    test(S(""), S("abcdefghij"), false, true);
+    test(S(""), S("abcdefghijklmnopqrst"), false, true);
+    test(S("abcde"), S(""), true, false);
+    test(S("abcde"), S("abcde"), true, true);
+    test(S("abcde"), S("abcdefghij"), false, true);
+    test(S("abcde"), S("abcdefghijklmnopqrst"), false, true);
+    test(S("abcdefghij"), S(""), true, false);
+    test(S("abcdefghij"), S("abcde"), true, false);
+    test(S("abcdefghij"), S("abcdefghij"), true, true);
+    test(S("abcdefghij"), S("abcdefghijklmnopqrst"), false, true);
+    test(S("abcdefghijklmnopqrst"), S(""), true, false);
+    test(S("abcdefghijklmnopqrst"), S("abcde"), true, false);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghij"), true, false);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), true, true);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (  sv1 >= sv1,  "" );
+    static_assert (  sv2 >= sv2,  "" );
+
+    static_assert (!(sv1 >= sv2), "" );
+    static_assert (  sv2 >= sv1,  "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.comparison/opgt.string_view.pointer.pass.cpp

@@ -0,0 +1,71 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// constexpr template<class charT, class traits, class Allocator>
+//   bool operator>(const charT* lhs, basic_string_wiew<charT,traits> rhs);
+// constexpr template<class charT, class traits, class Allocator>
+//   bool operator>(basic_string_wiew<charT,traits> lhs, const charT* rhs);
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const typename S::value_type* lhs, const S& rhs, bool x, bool y)
+{
+    assert((lhs > rhs) == x);
+    assert((rhs > lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test("", S(""), false, false);
+    test("", S("abcde"), false, true);
+    test("", S("abcdefghij"), false, true);
+    test("", S("abcdefghijklmnopqrst"), false, true);
+    test("abcde", S(""), true, false);
+    test("abcde", S("abcde"), false, false);
+    test("abcde", S("abcdefghij"), false, true);
+    test("abcde", S("abcdefghijklmnopqrst"), false, true);
+    test("abcdefghij", S(""), true, false);
+    test("abcdefghij", S("abcde"), true, false);
+    test("abcdefghij", S("abcdefghij"), false, false);
+    test("abcdefghij", S("abcdefghijklmnopqrst"), false, true);
+    test("abcdefghijklmnopqrst", S(""), true, false);
+    test("abcdefghijklmnopqrst", S("abcde"), true, false);
+    test("abcdefghijklmnopqrst", S("abcdefghij"), true, false);
+    test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), false, false);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (!(sv1     > ""), "" );
+    static_assert (!(""      > sv1), "" );
+    static_assert (!(sv1     > "abcde"), "" );
+    static_assert (  "abcde" > sv1, "" );
+    
+    static_assert (  sv2      > "", "" );
+    static_assert (!(""       > sv2), "" );
+    static_assert (!(sv2      > "abcde"), "" );
+    static_assert (!("abcde"  > sv2), "" );
+    static_assert (!(sv2      > "abcde0"), "" );
+    static_assert (  "abcde0" > sv2, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.comparison/opgt.string_view.string.pass.cpp

@@ -0,0 +1,50 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   bool operator>(const basic_string<charT,traits,Allocator>& lhs,
+//                   basic_string_view<charT,traits> rhs);
+//   bool operator>(basic_string_view<charT,traits> lhs,
+//            const basic_string<charT,traits,Allocator>&  rhs);
+
+#include <experimental/string_view>
+#include <cassert>
+
+template <class S>
+void
+test(const S& lhs, const typename S::value_type* rhs, bool x, bool y)
+{
+    assert((lhs > rhs) == x);
+    assert((rhs > lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test(S(""), "", false, false);
+    test(S(""), "abcde", false, true);
+    test(S(""), "abcdefghij", false, true);
+    test(S(""), "abcdefghijklmnopqrst", false, true);
+    test(S("abcde"), "", true, false);
+    test(S("abcde"), "abcde", false, false);
+    test(S("abcde"), "abcdefghij", false, true);
+    test(S("abcde"), "abcdefghijklmnopqrst", false, true);
+    test(S("abcdefghij"), "", true, false);
+    test(S("abcdefghij"), "abcde", true, false);
+    test(S("abcdefghij"), "abcdefghij", false, false);
+    test(S("abcdefghij"), "abcdefghijklmnopqrst", false, true);
+    test(S("abcdefghijklmnopqrst"), "", true, false);
+    test(S("abcdefghijklmnopqrst"), "abcde", true, false);
+    test(S("abcdefghijklmnopqrst"), "abcdefghij", true, false);
+    test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", false, false);
+    }
+}

test/experimental/string.view/string.view.comparison/opgt.string_view.string_view.pass.cpp

@@ -0,0 +1,64 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits>
+//  constexpr bool operator>(basic_string_view<charT,traits> lhs,
+//                  basic_string_view<charT,traits> rhs);
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& lhs, const S& rhs, bool x, bool y)
+{
+    assert((lhs > rhs) == x);
+    assert((rhs > lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test(S(""), S(""), false, false);
+    test(S(""), S("abcde"), false, true);
+    test(S(""), S("abcdefghij"), false, true);
+    test(S(""), S("abcdefghijklmnopqrst"), false, true);
+    test(S("abcde"), S(""), true, false);
+    test(S("abcde"), S("abcde"), false, false);
+    test(S("abcde"), S("abcdefghij"), false, true);
+    test(S("abcde"), S("abcdefghijklmnopqrst"), false, true);
+    test(S("abcdefghij"), S(""), true, false);
+    test(S("abcdefghij"), S("abcde"), true, false);
+    test(S("abcdefghij"), S("abcdefghij"), false, false);
+    test(S("abcdefghij"), S("abcdefghijklmnopqrst"), false, true);
+    test(S("abcdefghijklmnopqrst"), S(""), true, false);
+    test(S("abcdefghijklmnopqrst"), S("abcde"), true, false);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghij"), true, false);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), false, false);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (!(sv1 > sv1), "" );
+    static_assert (!(sv2 > sv2), "" );
+
+    static_assert (!(sv1 > sv2), "" );
+    static_assert (  sv2 > sv1, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.comparison/ople.string_view.pointer.pass.cpp

@@ -0,0 +1,71 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   constexpr bool operator<=(const charT* lhs, basic_string_wiew<charT,traits> rhs);
+// template<class charT, class traits, class Allocator>
+//   constexpr bool operator<=(basic_string_wiew<charT,traits> lhs, const charT* rhs);
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const typename S::value_type* lhs, const S& rhs, bool x, bool y)
+{
+    assert((lhs <= rhs) == x);
+    assert((rhs <= lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test("", S(""), true, true);
+    test("", S("abcde"), true, false);
+    test("", S("abcdefghij"), true, false);
+    test("", S("abcdefghijklmnopqrst"), true, false);
+    test("abcde", S(""), false, true);
+    test("abcde", S("abcde"), true, true);
+    test("abcde", S("abcdefghij"), true, false);
+    test("abcde", S("abcdefghijklmnopqrst"), true, false);
+    test("abcdefghij", S(""), false, true);
+    test("abcdefghij", S("abcde"), false, true);
+    test("abcdefghij", S("abcdefghij"), true, true);
+    test("abcdefghij", S("abcdefghijklmnopqrst"), true, false);
+    test("abcdefghijklmnopqrst", S(""), false, true);
+    test("abcdefghijklmnopqrst", S("abcde"), false, true);
+    test("abcdefghijklmnopqrst", S("abcdefghij"), false, true);
+    test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), true, true);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (  sv1     <= "", "" );
+    static_assert (  ""      <= sv1, "" );
+    static_assert (  sv1     <= "abcde", "" );
+    static_assert (!("abcde" <= sv1), "" );
+    
+    static_assert (!(sv2      <= ""), "" );
+    static_assert (  ""       <= sv2, "" );
+    static_assert (  sv2      <= "abcde", "" );
+    static_assert (  "abcde"  <= sv2, "" );
+    static_assert (  sv2      <= "abcde0", "" );
+    static_assert (!("abcde0" <= sv2), "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.comparison/ople.string_view.string.pass.cpp

@@ -0,0 +1,50 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   bool operator<=(const basic_string<charT,traits,Allocator>& lhs,
+//                   basic_string_view<charT,traits> rhs);
+//   bool operator<=(basic_string_view<charT,traits> lhs,
+//            const basic_string<charT,traits,Allocator>&  rhs);
+
+#include <experimental/string_view>
+#include <cassert>
+
+template <class S>
+void
+test(const S& lhs, const typename S::value_type* rhs, bool x, bool y)
+{
+    assert((lhs <= rhs) == x);
+    assert((rhs <= lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test(S(""), "", true, true);
+    test(S(""), "abcde", true, false);
+    test(S(""), "abcdefghij", true, false);
+    test(S(""), "abcdefghijklmnopqrst", true, false);
+    test(S("abcde"), "", false, true);
+    test(S("abcde"), "abcde", true, true);
+    test(S("abcde"), "abcdefghij", true, false);
+    test(S("abcde"), "abcdefghijklmnopqrst", true, false);
+    test(S("abcdefghij"), "", false, true);
+    test(S("abcdefghij"), "abcde", false, true);
+    test(S("abcdefghij"), "abcdefghij", true, true);
+    test(S("abcdefghij"), "abcdefghijklmnopqrst", true, false);
+    test(S("abcdefghijklmnopqrst"), "", false, true);
+    test(S("abcdefghijklmnopqrst"), "abcde", false, true);
+    test(S("abcdefghijklmnopqrst"), "abcdefghij", false, true);
+    test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", true, true);
+    }
+}

test/experimental/string.view/string.view.comparison/ople.string_view.string_view.pass.cpp

@@ -0,0 +1,64 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits>
+//   constexpr bool operator<=(basic_string_view<charT,traits> lhs,
+//                  basic_string_view<charT,traits> rhs);
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& lhs, const S& rhs, bool x, bool y)
+{
+    assert((lhs <= rhs) == x);
+    assert((rhs <= lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test(S(""), S(""), true, true);
+    test(S(""), S("abcde"), true, false);
+    test(S(""), S("abcdefghij"), true, false);
+    test(S(""), S("abcdefghijklmnopqrst"), true, false);
+    test(S("abcde"), S(""), false, true);
+    test(S("abcde"), S("abcde"), true, true);
+    test(S("abcde"), S("abcdefghij"), true, false);
+    test(S("abcde"), S("abcdefghijklmnopqrst"), true, false);
+    test(S("abcdefghij"), S(""), false, true);
+    test(S("abcdefghij"), S("abcde"), false, true);
+    test(S("abcdefghij"), S("abcdefghij"), true, true);
+    test(S("abcdefghij"), S("abcdefghijklmnopqrst"), true, false);
+    test(S("abcdefghijklmnopqrst"), S(""), false, true);
+    test(S("abcdefghijklmnopqrst"), S("abcde"), false, true);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghij"), false, true);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), true, true);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (  sv1 <= sv1,  "" );
+    static_assert (  sv2 <= sv2,  "" );
+
+    static_assert (  sv1 <= sv2,  "" );
+    static_assert (!(sv2 <= sv1), "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.comparison/oplt.string_view.pointer.pass.cpp

@@ -0,0 +1,71 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   constexpr bool operator<(const charT* lhs, basic_string_wiew<charT,traits> rhs);
+// template<class charT, class traits, class Allocator>
+//   constexpr bool operator<(basic_string_wiew<charT,traits> lhs, const charT* rhs);
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const typename S::value_type* lhs, const S& rhs, bool x, bool y)
+{
+    assert((lhs < rhs) == x);
+    assert((rhs < lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test("", S(""), false, false);
+    test("", S("abcde"), true, false);
+    test("", S("abcdefghij"), true, false);
+    test("", S("abcdefghijklmnopqrst"), true, false);
+    test("abcde", S(""), false, true);
+    test("abcde", S("abcde"), false, false);
+    test("abcde", S("abcdefghij"), true, false);
+    test("abcde", S("abcdefghijklmnopqrst"), true, false);
+    test("abcdefghij", S(""), false, true);
+    test("abcdefghij", S("abcde"), false, true);
+    test("abcdefghij", S("abcdefghij"), false, false);
+    test("abcdefghij", S("abcdefghijklmnopqrst"), true, false);
+    test("abcdefghijklmnopqrst", S(""), false, true);
+    test("abcdefghijklmnopqrst", S("abcde"), false, true);
+    test("abcdefghijklmnopqrst", S("abcdefghij"), false, true);
+    test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), false, false);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (!(sv1     < ""), "" );
+    static_assert (!(""      < sv1), "" );
+    static_assert (  sv1     < "abcde", "" );
+    static_assert (!("abcde" < sv1), "" );
+    
+    static_assert (!(sv2      < ""), "" );
+    static_assert (  ""       < sv2, "" );
+    static_assert (!(sv2      < "abcde"), "" );
+    static_assert (!("abcde"  < sv2), "" );
+    static_assert (  sv2      < "abcde0", "" );
+    static_assert (!("abcde0" < sv2), "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.comparison/oplt.string_view.string.pass.cpp

@@ -0,0 +1,50 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   bool operator<(const basic_string<charT,traits,Allocator>& lhs,
+//                   basic_string_view<charT,traits> rhs);
+//   bool operator<(basic_string_view<charT,traits> lhs,
+//            const basic_string<charT,traits,Allocator>&  rhs);
+
+#include <experimental/string_view>
+#include <cassert>
+
+template <class S>
+void
+test(const S& lhs, const typename S::value_type* rhs, bool x, bool y)
+{
+    assert((lhs < rhs) == x);
+    assert((rhs < lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test(S(""), "", false, false);
+    test(S(""), "abcde", true, false);
+    test(S(""), "abcdefghij", true, false);
+    test(S(""), "abcdefghijklmnopqrst", true, false);
+    test(S("abcde"), "", false, true);
+    test(S("abcde"), "abcde", false, false);
+    test(S("abcde"), "abcdefghij", true, false);
+    test(S("abcde"), "abcdefghijklmnopqrst", true, false);
+    test(S("abcdefghij"), "", false, true);
+    test(S("abcdefghij"), "abcde", false, true);
+    test(S("abcdefghij"), "abcdefghij", false, false);
+    test(S("abcdefghij"), "abcdefghijklmnopqrst", true, false);
+    test(S("abcdefghijklmnopqrst"), "", false, true);
+    test(S("abcdefghijklmnopqrst"), "abcde", false, true);
+    test(S("abcdefghijklmnopqrst"), "abcdefghij", false, true);
+    test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", false, false);
+    }
+}

test/experimental/string.view/string.view.comparison/oplt.string_view.string_view.pass.cpp

@@ -0,0 +1,64 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits>
+//   constexpr bool operator<(basic_string_view<charT,traits> lhs,
+//                  basic_string_view<charT,traits> rhs);
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& lhs, const S& rhs, bool x, bool y)
+{
+    assert((lhs < rhs) == x);
+    assert((rhs < lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test(S(""), S(""), false, false);
+    test(S(""), S("abcde"), true, false);
+    test(S(""), S("abcdefghij"), true, false);
+    test(S(""), S("abcdefghijklmnopqrst"), true, false);
+    test(S("abcde"), S(""), false, true);
+    test(S("abcde"), S("abcde"), false, false);
+    test(S("abcde"), S("abcdefghij"), true, false);
+    test(S("abcde"), S("abcdefghijklmnopqrst"), true, false);
+    test(S("abcdefghij"), S(""), false, true);
+    test(S("abcdefghij"), S("abcde"), false, true);
+    test(S("abcdefghij"), S("abcdefghij"), false, false);
+    test(S("abcdefghij"), S("abcdefghijklmnopqrst"), true, false);
+    test(S("abcdefghijklmnopqrst"), S(""), false, true);
+    test(S("abcdefghijklmnopqrst"), S("abcde"), false, true);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghij"), false, true);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), false, false);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (!(sv1 < sv1), "" );
+    static_assert (!(sv2 < sv2), "" );
+
+    static_assert (  sv1 < sv2,  "" );
+    static_assert (!(sv2 < sv1), "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.comparison/opne.string_view.pointer.pass.cpp

@@ -0,0 +1,69 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits>
+//   constexpr bool operator!=(basic_string_view<charT,traits> lhs, const charT* rhs);
+// template<class charT, class traits>
+//   constexpr bool operator!=(const charT* lhs, basic_string_view<charT,traits> rhs);
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(S lhs, const typename S::value_type* rhs, bool x)
+{
+    assert((lhs != rhs) == x);
+    assert((rhs != lhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test(S(""), "", false);
+    test(S(""), "abcde", true);
+    test(S(""), "abcdefghij", true);
+    test(S(""), "abcdefghijklmnopqrst", true);
+    test(S("abcde"), "", true);
+    test(S("abcde"), "abcde", false);
+    test(S("abcde"), "abcdefghij", true);
+    test(S("abcde"), "abcdefghijklmnopqrst", true);
+    test(S("abcdefghij"), "", true);
+    test(S("abcdefghij"), "abcde", true);
+    test(S("abcdefghij"), "abcdefghij", false);
+    test(S("abcdefghij"), "abcdefghijklmnopqrst", true);
+    test(S("abcdefghijklmnopqrst"), "", true);
+    test(S("abcdefghijklmnopqrst"), "abcde", true);
+    test(S("abcdefghijklmnopqrst"), "abcdefghij", true);
+    test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", false);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (!(sv1     != ""), "" );
+    static_assert (!(""      != sv1), "" );
+    static_assert (  sv1     != "abcde", "" );
+    static_assert (  "abcde" != sv1, "" );
+    
+    static_assert (!(sv2      != "abcde"), "" );
+    static_assert (!("abcde"  != sv2), "" );
+    static_assert (  sv2      != "abcde0",   "" );
+    static_assert (  "abcde0" != sv2, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.comparison/opne.string_view.string.pass.cpp

@@ -0,0 +1,49 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   bool operator!=(const basic_string<charT, traits, Allocator> &lhs, basic_string_view<charT,traits> rhs);
+// template<class charT, class traits, class Allocator>
+//   bool operator!=(basic_string_view<charT,traits> lhs, const basic_string<charT, traits, Allocator> &rhs);
+
+#include <experimental/string_view>
+#include <cassert>
+
+template <class S>
+void
+test(const std::string &lhs, S rhs, bool x)
+{
+    assert((lhs != rhs) == x);
+    assert((rhs != lhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test("", S(""), false);
+    test("", S("abcde"), true);
+    test("", S("abcdefghij"), true);
+    test("", S("abcdefghijklmnopqrst"), true);
+    test("abcde", S(""), true);
+    test("abcde", S("abcde"), false);
+    test("abcde", S("abcdefghij"), true);
+    test("abcde", S("abcdefghijklmnopqrst"), true);
+    test("abcdefghij", S(""), true);
+    test("abcdefghij", S("abcde"), true);
+    test("abcdefghij", S("abcdefghij"), false);
+    test("abcdefghij", S("abcdefghijklmnopqrst"), true);
+    test("abcdefghijklmnopqrst", S(""), true);
+    test("abcdefghijklmnopqrst", S("abcde"), true);
+    test("abcdefghijklmnopqrst", S("abcdefghij"), true);
+    test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), false);
+    }
+}

test/experimental/string.view/string.view.comparison/opne.string_view.string_view.pass.cpp

@@ -0,0 +1,61 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// template<class charT, class traits, class Allocator>
+//   constexpr bool operator!=(const basic_string_view<charT,traits> lhs,
+//                   const basic_string_view<charT,traits> rhs);
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(S lhs, S rhs, bool x)
+{
+    assert((lhs != rhs) == x);
+    assert((rhs != lhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test(S(""), S(""), false);
+    test(S(""), S("abcde"), true);
+    test(S(""), S("abcdefghij"), true);
+    test(S(""), S("abcdefghijklmnopqrst"), true);
+    test(S("abcde"), S(""), true);
+    test(S("abcde"), S("abcde"), false);
+    test(S("abcde"), S("abcdefghij"), true);
+    test(S("abcde"), S("abcdefghijklmnopqrst"), true);
+    test(S("abcdefghij"), S(""), true);
+    test(S("abcdefghij"), S("abcde"), true);
+    test(S("abcdefghij"), S("abcdefghij"), false);
+    test(S("abcdefghij"), S("abcdefghijklmnopqrst"), true);
+    test(S("abcdefghijklmnopqrst"), S(""), true);
+    test(S("abcdefghijklmnopqrst"), S("abcde"), true);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghij"), true);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), false);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2;
+    constexpr SV  sv3 { "abcde", 5 };
+    static_assert (!( sv1 != sv2), "" );
+    static_assert (   sv1 != sv3,  "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.cons/default.pass.cpp

@@ -0,0 +1,46 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// constexpr basic_string_view () noexcept;
+
+#include <experimental/string_view>
+#include <cassert>
+
+template<typename T>
+void test () {
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr T sv1;
+    static_assert ( sv1.size() == 0, "" );
+    static_assert ( sv1.empty(), "");
+    }
+#endif
+    
+    {
+    T sv1;
+    assert ( sv1.size() == 0 );
+    assert ( sv1.empty());
+    }
+}
+
+int main () {
+    using string_view    = std::experimental::string_view;
+    using u16string_view = std::experimental::u16string_view;
+    using u32string_view = std::experimental::u32string_view;
+    using wstring_view   = std::experimental::wstring_view;
+
+    test<string_view> ();
+    test<u16string_view> ();
+    test<u32string_view> ();
+    test<wstring_view> ();
+
+}

test/experimental/string.view/string.view.cons/from_literal.pass.cpp

@@ -0,0 +1,64 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// constexpr basic_string_view(const _CharT* _s)
+//    : __data (_s), __size(_Traits::length(_s)) {}
+
+
+#include <experimental/string_view>
+#include <string>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template<typename CharT>
+size_t StrLen ( const CharT *s ) {
+    size_t retVal = 0;
+    while ( *s != 0 ) { ++retVal; ++s; }
+    return retVal;
+    }
+
+template<typename CharT>
+void test ( const CharT *s ) {
+    std::experimental::basic_string_view<CharT> sv1 ( s );
+    assert ( sv1.size() == StrLen( s ));
+    assert ( sv1.data() == s );
+    }
+
+
+int main () {
+
+    test ( "QBCDE" );
+    test ( "A" );
+    test ( "" );
+    
+    test ( L"QBCDE" );
+    test ( L"A" );
+    test ( L"" );
+
+#if __cplusplus >= 201103L
+    test ( u"QBCDE" );
+    test ( u"A" );
+    test ( u"" );
+
+    test ( U"QBCDE" );
+    test ( U"A" );
+    test ( U"" );
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr std::experimental::basic_string_view<char, constexpr_char_traits<char>> sv1 ( "ABCDE" );
+    static_assert ( sv1.size() == 5, "");
+    }
+#endif
+}

test/experimental/string.view/string.view.cons/from_ptr_len.pass.cpp

@@ -0,0 +1,81 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+//  constexpr basic_string_view(const _CharT* _s, size_type _len)
+//      : __data (_s), __size(_len) {}
+
+
+#include <experimental/string_view>
+#include <string>
+#include <cassert>
+
+template<typename CharT>
+void test ( const CharT *s, size_t sz ) {
+    {
+    std::experimental::basic_string_view<CharT> sv1 ( s, sz );
+    assert ( sv1.size() == sz );
+    assert ( sv1.data() == s );
+    }
+}
+
+int main () {
+
+    test ( "QBCDE", 5 );
+    test ( "QBCDE", 2 );
+    test ( "", 0 );
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr const char *s = "QBCDE";
+    constexpr std::experimental::basic_string_view<char> sv1 ( s, 2 );
+    static_assert ( sv1.size() == 2, "" );
+    static_assert ( sv1.data() == s, "" );
+    }
+#endif
+
+    test ( L"QBCDE", 5 );
+    test ( L"QBCDE", 2 );
+    test ( L"", 0 );
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr const wchar_t *s = L"QBCDE";
+    constexpr std::experimental::basic_string_view<wchar_t> sv1 ( s, 2 );
+    static_assert ( sv1.size() == 2, "" );
+    static_assert ( sv1.data() == s, "" );
+    }
+#endif
+
+#if __cplusplus >= 201103L
+    test ( u"QBCDE", 5 );
+    test ( u"QBCDE", 2 );
+    test ( u"", 0 );
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr const char16_t *s = u"QBCDE";
+    constexpr std::experimental::basic_string_view<char16_t> sv1 ( s, 2 );
+    static_assert ( sv1.size() == 2, "" );
+    static_assert ( sv1.data() == s, "" );
+    }
+#endif
+
+    test ( U"QBCDE", 5 );
+    test ( U"QBCDE", 2 );
+    test ( U"", 0 );
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr const char32_t *s = U"QBCDE";
+    constexpr std::experimental::basic_string_view<char32_t> sv1 ( s, 2 );
+    static_assert ( sv1.size() == 2, "" );
+    static_assert ( sv1.data() == s, "" );
+    }
+#endif
+#endif
+}

test/experimental/string.view/string.view.cons/from_string.pass.cpp

@@ -0,0 +1,54 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// template<class Allocator>
+// basic_string_view(const basic_string<_CharT, _Traits, Allocator>& _str) noexcept
+
+
+#include <experimental/string_view>
+#include <string>
+#include <cassert>
+
+struct dummy_char_traits : public std::char_traits<char> {};
+
+template<typename CharT, typename Traits>
+void test ( const std::basic_string<CharT, Traits> &str ) {
+    std::experimental::basic_string_view<CharT, Traits> sv1 ( str );
+    assert ( sv1.size() == str.size());
+    assert ( sv1.data() == str.data());
+}
+
+int main () {
+
+    test ( std::string("QBCDE") );
+    test ( std::string("") );
+    test ( std::string() );
+    
+    test ( std::wstring(L"QBCDE") );
+    test ( std::wstring(L"") );
+    test ( std::wstring() );
+
+#if __cplusplus >= 201103L
+    test ( std::u16string{u"QBCDE"} );
+    test ( std::u16string{u""} );
+    test ( std::u16string{} );
+
+    test ( std::u32string{U"QBCDE"} );
+    test ( std::u32string{U""} );
+    test ( std::u32string{} );
+#endif
+    
+    test ( std::basic_string<char, dummy_char_traits>("QBCDE") );
+    test ( std::basic_string<char, dummy_char_traits>("") );
+    test ( std::basic_string<char, dummy_char_traits>() );
+
+}

test/experimental/string.view/string.view.cons/from_string1.fail.cpp

@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// template<class Allocator>
+// basic_string_view(const basic_string<_CharT, _Traits, Allocator>& _str) noexcept
+
+#include <experimental/string_view>
+#include <string>
+#include <cassert>
+
+struct dummy_char_traits : public std::char_traits<char> {};
+
+int main () {
+    using string_view = std::experimental::basic_string_view<char>;
+    using string      = std::              basic_string     <char, dummy_char_traits>;
+    
+    {
+    string s{"QBCDE"};
+    string_view sv1 ( s );
+    assert ( sv1.size() == s.size());
+    assert ( sv1.data() == s.data());
+    }
+}

test/experimental/string.view/string.view.cons/from_string2.fail.cpp

@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// template<class Allocator>
+// basic_string_view(const basic_string<_CharT, _Traits, Allocator>& _str) noexcept
+
+#include <experimental/string_view>
+#include <string>
+#include <cassert>
+
+struct dummy_char_traits : public std::char_traits<char> {};
+
+int main () {
+    using string_view = std::experimental::basic_string_view<char, dummy_char_traits>;
+    using string      = std::              basic_string     <char>;
+    
+    {
+    string s{"QBCDE"};
+    string_view sv1 ( s );
+    assert ( sv1.size() == s.size());
+    assert ( sv1.data() == s.data());
+    }
+}

test/experimental/string.view/string.view.find/find_char_size.pass.cpp

@@ -0,0 +1,84 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type find(charT c, size_type pos = 0) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.find(c, pos) == x);
+    if (x != S::npos)
+        assert(pos <= x && x + 1 <= s.size());
+}
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type x)
+{
+    assert(s.find(c) == x);
+    if (x != S::npos)
+        assert(0 <= x && x + 1 <= s.size());
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test(S(""), 'c', 0, S::npos);
+    test(S(""), 'c', 1, S::npos);
+    test(S("abcde"), 'c', 0, 2);
+    test(S("abcde"), 'c', 1, 2);
+    test(S("abcde"), 'c', 2, 2);
+    test(S("abcde"), 'c', 4, S::npos);
+    test(S("abcde"), 'c', 5, S::npos);
+    test(S("abcde"), 'c', 6, S::npos);
+    test(S("abcdeabcde"), 'c', 0, 2);
+    test(S("abcdeabcde"), 'c', 1, 2);
+    test(S("abcdeabcde"), 'c', 5, 7);
+    test(S("abcdeabcde"), 'c', 9, S::npos);
+    test(S("abcdeabcde"), 'c', 10, S::npos);
+    test(S("abcdeabcde"), 'c', 11, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), 'c', 0, 2);
+    test(S("abcdeabcdeabcdeabcde"), 'c', 1, 2);
+    test(S("abcdeabcdeabcdeabcde"), 'c', 10, 12);
+    test(S("abcdeabcdeabcdeabcde"), 'c', 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), 'c', 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), 'c', 21, S::npos);
+
+    test(S(""), 'c', S::npos);
+    test(S("abcde"), 'c', 2);
+    test(S("abcdeabcde"), 'c', 2);
+    test(S("abcdeabcdeabcdeabcde"), 'c', 2);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find( 'c', 0 ) == SV::npos, "" );
+    static_assert (sv1.find( 'c', 1 ) == SV::npos, "" );
+    static_assert (sv2.find( 'c', 0 ) == 2, "" );
+    static_assert (sv2.find( 'c', 1 ) == 2, "" );
+    static_assert (sv2.find( 'c', 2 ) == 2, "" );
+    static_assert (sv2.find( 'c', 3 ) == SV::npos, "" );
+    static_assert (sv2.find( 'c', 4 ) == SV::npos, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.find/find_first_not_of_char_size.pass.cpp

@@ -0,0 +1,84 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type find_first_not_of(charT c, size_type pos = 0) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.find_first_not_of(c, pos) == x);
+    if (x != S::npos)
+        assert(pos <= x && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type x)
+{
+    assert(s.find_first_not_of(c) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test(S(""), 'q', 0, S::npos);
+    test(S(""), 'q', 1, S::npos);
+    test(S("kitcj"), 'q', 0, 0);
+    test(S("qkamf"), 'q', 1, 1);
+    test(S("nhmko"), 'q', 2, 2);
+    test(S("tpsaf"), 'q', 4, 4);
+    test(S("lahfb"), 'q', 5, S::npos);
+    test(S("irkhs"), 'q', 6, S::npos);
+    test(S("gmfhdaipsr"), 'q', 0, 0);
+    test(S("kantesmpgj"), 'q', 1, 1);
+    test(S("odaftiegpm"), 'q', 5, 5);
+    test(S("oknlrstdpi"), 'q', 9, 9);
+    test(S("eolhfgpjqk"), 'q', 10, S::npos);
+    test(S("pcdrofikas"), 'q', 11, S::npos);
+    test(S("nbatdlmekrgcfqsophij"), 'q', 0, 0);
+    test(S("bnrpehidofmqtcksjgla"), 'q', 1, 1);
+    test(S("jdmciepkaqgotsrfnhlb"), 'q', 10, 10);
+    test(S("jtdaefblsokrmhpgcnqi"), 'q', 19, 19);
+    test(S("hkbgspofltajcnedqmri"), 'q', 20, S::npos);
+    test(S("oselktgbcapndfjihrmq"), 'q', 21, S::npos);
+
+    test(S(""), 'q', S::npos);
+    test(S("q"), 'q', S::npos);
+    test(S("qqq"), 'q', S::npos);
+    test(S("csope"), 'q', 0);
+    test(S("gfsmthlkon"), 'q', 0);
+    test(S("laenfsbridchgotmkqpj"), 'q', 0);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_first_not_of( 'q', 0 ) == SV::npos, "" );
+    static_assert (sv1.find_first_not_of( 'q', 1 ) == SV::npos, "" );
+    static_assert (sv2.find_first_not_of( 'q', 0 ) == 0, "" );
+    static_assert (sv2.find_first_not_of( 'q', 1 ) == 1, "" );
+    static_assert (sv2.find_first_not_of( 'q', 5 ) == SV::npos, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.find/find_first_not_of_pointer_size.pass.cpp

@@ -0,0 +1,165 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type find_first_not_of(const charT* s, size_type pos = 0) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.find_first_not_of(str, pos) == x);
+    if (x != S::npos)
+        assert(pos <= x && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type x)
+{
+    assert(s.find_first_not_of(str) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, S::npos);
+    test(S(""), "laenf", 0, S::npos);
+    test(S(""), "pqlnkmbdjo", 0, S::npos);
+    test(S(""), "qkamfogpnljdcshbreti", 0, S::npos);
+    test(S(""), "", 1, S::npos);
+    test(S(""), "bjaht", 1, S::npos);
+    test(S(""), "hjlcmgpket", 1, S::npos);
+    test(S(""), "htaobedqikfplcgjsmrn", 1, S::npos);
+    test(S("fodgq"), "", 0, 0);
+    test(S("qanej"), "dfkap", 0, 0);
+    test(S("clbao"), "ihqrfebgad", 0, 0);
+    test(S("mekdn"), "ngtjfcalbseiqrphmkdo", 0, S::npos);
+    test(S("srdfq"), "", 1, 1);
+    test(S("oemth"), "ikcrq", 1, 1);
+    test(S("cdaih"), "dmajblfhsg", 1, 3);
+    test(S("qohtk"), "oqftjhdmkgsblacenirp", 1, S::npos);
+    test(S("cshmd"), "", 2, 2);
+    test(S("lhcdo"), "oebqi", 2, 2);
+    test(S("qnsoh"), "kojhpmbsfe", 2, S::npos);
+    test(S("pkrof"), "acbsjqogpltdkhinfrem", 2, S::npos);
+    test(S("fmtsp"), "", 4, 4);
+    test(S("khbpm"), "aobjd", 4, 4);
+    test(S("pbsji"), "pcbahntsje", 4, 4);
+    test(S("mprdj"), "fhepcrntkoagbmldqijs", 4, S::npos);
+    test(S("eqmpa"), "", 5, S::npos);
+    test(S("omigs"), "kocgb", 5, S::npos);
+    test(S("onmje"), "fbslrjiqkm", 5, S::npos);
+    test(S("oqmrj"), "jeidpcmalhfnqbgtrsko", 5, S::npos);
+    test(S("schfa"), "", 6, S::npos);
+    test(S("igdsc"), "qngpd", 6, S::npos);
+    test(S("brqgo"), "rodhqklgmb", 6, S::npos);
+    test(S("tnrph"), "thdjgafrlbkoiqcspmne", 6, S::npos);
+    test(S("hcjitbfapl"), "", 0, 0);
+    test(S("daiprenocl"), "ashjd", 0, 2);
+    test(S("litpcfdghe"), "mgojkldsqh", 0, 1);
+    test(S("aidjksrolc"), "imqnaghkfrdtlopbjesc", 0, S::npos);
+    test(S("qpghtfbaji"), "", 1, 1);
+    test(S("gfshlcmdjr"), "nadkh", 1, 1);
+    test(S("nkodajteqp"), "ofdrqmkebl", 1, 4);
+    test(S("gbmetiprqd"), "bdfjqgatlksriohemnpc", 1, S::npos);
+    test(S("crnklpmegd"), "", 5, 5);
+    test(S("jsbtafedoc"), "prqgn", 5, 5);
+    test(S("qnmodrtkeb"), "pejafmnokr", 5, 6);
+    test(S("cpebqsfmnj"), "odnqkgijrhabfmcestlp", 5, S::npos);
+    test(S("lmofqdhpki"), "", 9, 9);
+    test(S("hnefkqimca"), "rtjpa", 9, S::npos);
+    test(S("drtasbgmfp"), "ktsrmnqagd", 9, 9);
+    test(S("lsaijeqhtr"), "rtdhgcisbnmoaqkfpjle", 9, S::npos);
+    test(S("elgofjmbrq"), "", 10, S::npos);
+    test(S("mjqdgalkpc"), "dplqa", 10, S::npos);
+    test(S("kthqnfcerm"), "dkacjoptns", 10, S::npos);
+    test(S("dfsjhanorc"), "hqfimtrgnbekpdcsjalo", 10, S::npos);
+    test(S("eqsgalomhb"), "", 11, S::npos);
+    test(S("akiteljmoh"), "lofbc", 11, S::npos);
+    test(S("hlbdfreqjo"), "astoegbfpn", 11, S::npos);
+    test(S("taqobhlerg"), "pdgreqomsncafklhtibj", 11, S::npos);
+    test(S("snafbdlghrjkpqtoceim"), "", 0, 0);
+    test(S("aemtbrgcklhndjisfpoq"), "lbtqd", 0, 0);
+    test(S("pnracgfkjdiholtbqsem"), "tboimldpjh", 0, 1);
+    test(S("dicfltehbsgrmojnpkaq"), "slcerthdaiqjfnobgkpm", 0, S::npos);
+    test(S("jlnkraeodhcspfgbqitm"), "", 1, 1);
+    test(S("lhosrngtmfjikbqpcade"), "aqibs", 1, 1);
+    test(S("rbtaqjhgkneisldpmfoc"), "gtfblmqinc", 1, 3);
+    test(S("gpifsqlrdkbonjtmheca"), "mkqpbtdalgniorhfescj", 1, S::npos);
+    test(S("hdpkobnsalmcfijregtq"), "", 10, 10);
+    test(S("jtlshdgqaiprkbcoenfm"), "pblas", 10, 11);
+    test(S("fkdrbqltsgmcoiphneaj"), "arosdhcfme", 10, 13);
+    test(S("crsplifgtqedjohnabmk"), "blkhjeogicatqfnpdmsr", 10, S::npos);
+    test(S("niptglfbosehkamrdqcj"), "", 19, 19);
+    test(S("copqdhstbingamjfkler"), "djkqc", 19, 19);
+    test(S("mrtaefilpdsgocnhqbjk"), "lgokshjtpb", 19, S::npos);
+    test(S("kojatdhlcmigpbfrqnes"), "bqjhtkfepimcnsgrlado", 19, S::npos);
+    test(S("eaintpchlqsbdgrkjofm"), "", 20, S::npos);
+    test(S("gjnhidfsepkrtaqbmclo"), "nocfa", 20, S::npos);
+    test(S("spocfaktqdbiejlhngmr"), "bgtajmiedc", 20, S::npos);
+    test(S("rphmlekgfscndtaobiqj"), "lsckfnqgdahejiopbtmr", 20, S::npos);
+    test(S("liatsqdoegkmfcnbhrpj"), "", 21, S::npos);
+    test(S("binjagtfldkrspcomqeh"), "gfsrt", 21, S::npos);
+    test(S("latkmisecnorjbfhqpdg"), "pfsocbhjtm", 21, S::npos);
+    test(S("lecfratdjkhnsmqpoigb"), "tpflmdnoicjgkberhqsa", 21, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), "", S::npos);
+    test(S(""), "laenf", S::npos);
+    test(S(""), "pqlnkmbdjo", S::npos);
+    test(S(""), "qkamfogpnljdcshbreti", S::npos);
+    test(S("nhmko"), "", 0);
+    test(S("lahfb"), "irkhs", 0);
+    test(S("gmfhd"), "kantesmpgj", 2);
+    test(S("odaft"), "oknlrstdpiqmjbaghcfe", S::npos);
+    test(S("eolhfgpjqk"), "", 0);
+    test(S("nbatdlmekr"), "bnrpe", 2);
+    test(S("jdmciepkaq"), "jtdaefblso", 2);
+    test(S("hkbgspoflt"), "oselktgbcapndfjihrmq", S::npos);
+    test(S("gprdcokbnjhlsfmtieqa"), "", 0);
+    test(S("qjghlnftcaismkropdeb"), "bjaht", 0);
+    test(S("pnalfrdtkqcmojiesbhg"), "hjlcmgpket", 1);
+    test(S("pniotcfrhqsmgdkjbael"), "htaobedqikfplcgjsmrn", S::npos);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_first_not_of( "",      0) == SV::npos, "" );
+    static_assert (sv1.find_first_not_of( "irkhs", 0) == SV::npos, "" );
+    static_assert (sv2.find_first_not_of( "",      0) == 0, "" );
+    static_assert (sv2.find_first_not_of( "gfsrt", 0) == 0, "" );
+    static_assert (sv2.find_first_not_of( "lecar", 0) == 1, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.find/find_first_not_of_pointer_size_size.pass.cpp

@@ -0,0 +1,392 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type find_first_not_of(const charT* s, size_type pos, size_type n) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type n, typename S::size_type x)
+{
+    assert(s.find_first_not_of(str, pos, n) == x);
+    if (x != S::npos)
+        assert(pos <= x && x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, 0, S::npos);
+    test(S(""), "irkhs", 0, 0, S::npos);
+    test(S(""), "kante", 0, 1, S::npos);
+    test(S(""), "oknlr", 0, 2, S::npos);
+    test(S(""), "pcdro", 0, 4, S::npos);
+    test(S(""), "bnrpe", 0, 5, S::npos);
+    test(S(""), "jtdaefblso", 0, 0, S::npos);
+    test(S(""), "oselktgbca", 0, 1, S::npos);
+    test(S(""), "eqgaplhckj", 0, 5, S::npos);
+    test(S(""), "bjahtcmnlp", 0, 9, S::npos);
+    test(S(""), "hjlcmgpket", 0, 10, S::npos);
+    test(S(""), "htaobedqikfplcgjsmrn", 0, 0, S::npos);
+    test(S(""), "hpqiarojkcdlsgnmfetb", 0, 1, S::npos);
+    test(S(""), "dfkaprhjloqetcsimnbg", 0, 10, S::npos);
+    test(S(""), "ihqrfebgadntlpmjksoc", 0, 19, S::npos);
+    test(S(""), "ngtjfcalbseiqrphmkdo", 0, 20, S::npos);
+    test(S(""), "", 1, 0, S::npos);
+    test(S(""), "lbtqd", 1, 0, S::npos);
+    test(S(""), "tboim", 1, 1, S::npos);
+    test(S(""), "slcer", 1, 2, S::npos);
+    test(S(""), "cbjfs", 1, 4, S::npos);
+    test(S(""), "aqibs", 1, 5, S::npos);
+    test(S(""), "gtfblmqinc", 1, 0, S::npos);
+    test(S(""), "mkqpbtdalg", 1, 1, S::npos);
+    test(S(""), "kphatlimcd", 1, 5, S::npos);
+    test(S(""), "pblasqogic", 1, 9, S::npos);
+    test(S(""), "arosdhcfme", 1, 10, S::npos);
+    test(S(""), "blkhjeogicatqfnpdmsr", 1, 0, S::npos);
+    test(S(""), "bmhineprjcoadgstflqk", 1, 1, S::npos);
+    test(S(""), "djkqcmetslnghpbarfoi", 1, 10, S::npos);
+    test(S(""), "lgokshjtpbemarcdqnfi", 1, 19, S::npos);
+    test(S(""), "bqjhtkfepimcnsgrlado", 1, 20, S::npos);
+    test(S("eaint"), "", 0, 0, 0);
+    test(S("binja"), "gfsrt", 0, 0, 0);
+    test(S("latkm"), "pfsoc", 0, 1, 0);
+    test(S("lecfr"), "tpflm", 0, 2, 0);
+    test(S("eqkst"), "sgkec", 0, 4, 1);
+    test(S("cdafr"), "romds", 0, 5, 0);
+    test(S("prbhe"), "qhjistlgmr", 0, 0, 0);
+    test(S("lbisk"), "pedfirsglo", 0, 1, 0);
+    test(S("hrlpd"), "aqcoslgrmk", 0, 5, 0);
+    test(S("ehmja"), "dabckmepqj", 0, 9, 1);
+    test(S("mhqgd"), "pqscrjthli", 0, 10, 0);
+    test(S("tgklq"), "kfphdcsjqmobliagtren", 0, 0, 0);
+    test(S("bocjs"), "rokpefncljibsdhqtagm", 0, 1, 0);
+    test(S("grbsd"), "afionmkphlebtcjqsgrd", 0, 10, 0);
+    test(S("ofjqr"), "aenmqplidhkofrjbctsg", 0, 19, S::npos);
+    test(S("btlfi"), "osjmbtcadhiklegrpqnf", 0, 20, S::npos);
+    test(S("clrgb"), "", 1, 0, 1);
+    test(S("tjmek"), "osmia", 1, 0, 1);
+    test(S("bgstp"), "ckonl", 1, 1, 1);
+    test(S("hstrk"), "ilcaj", 1, 2, 1);
+    test(S("kmspj"), "lasiq", 1, 4, 1);
+    test(S("tjboh"), "kfqmr", 1, 5, 1);
+    test(S("ilbcj"), "klnitfaobg", 1, 0, 1);
+    test(S("jkngf"), "gjhmdlqikp", 1, 1, 1);
+    test(S("gfcql"), "skbgtahqej", 1, 5, 1);
+    test(S("dqtlg"), "bjsdgtlpkf", 1, 9, 1);
+    test(S("bthpg"), "bjgfmnlkio", 1, 10, 1);
+    test(S("dgsnq"), "lbhepotfsjdqigcnamkr", 1, 0, 1);
+    test(S("rmfhp"), "tebangckmpsrqdlfojhi", 1, 1, 1);
+    test(S("jfdam"), "joflqbdkhtegimscpanr", 1, 10, 3);
+    test(S("edapb"), "adpmcohetfbsrjinlqkg", 1, 19, S::npos);
+    test(S("brfsm"), "iacldqjpfnogbsrhmetk", 1, 20, S::npos);
+    test(S("ndrhl"), "", 2, 0, 2);
+    test(S("mrecp"), "otkgb", 2, 0, 2);
+    test(S("qlasf"), "cqsjl", 2, 1, 2);
+    test(S("smaqd"), "dpifl", 2, 2, 2);
+    test(S("hjeni"), "oapht", 2, 4, 2);
+    test(S("ocmfj"), "cifts", 2, 5, 2);
+    test(S("hmftq"), "nmsckbgalo", 2, 0, 2);
+    test(S("fklad"), "tpksqhamle", 2, 1, 2);
+    test(S("dirnm"), "tpdrchmkji", 2, 5, 3);
+    test(S("hrgdc"), "ijagfkblst", 2, 9, 3);
+    test(S("ifakg"), "kpocsignjb", 2, 10, 2);
+    test(S("ebrgd"), "pecqtkjsnbdrialgmohf", 2, 0, 2);
+    test(S("rcjml"), "aiortphfcmkjebgsndql", 2, 1, 2);
+    test(S("peqmt"), "sdbkeamglhipojqftrcn", 2, 10, 2);
+    test(S("frehn"), "ljqncehgmfktroapidbs", 2, 19, S::npos);
+    test(S("tqolf"), "rtcfodilamkbenjghqps", 2, 20, S::npos);
+    test(S("cjgao"), "", 4, 0, 4);
+    test(S("kjplq"), "mabns", 4, 0, 4);
+    test(S("herni"), "bdnrp", 4, 1, 4);
+    test(S("tadrb"), "scidp", 4, 2, 4);
+    test(S("pkfeo"), "agbjl", 4, 4, 4);
+    test(S("hoser"), "jfmpr", 4, 5, S::npos);
+    test(S("kgrsp"), "rbpefghsmj", 4, 0, 4);
+    test(S("pgejb"), "apsfntdoqc", 4, 1, 4);
+    test(S("thlnq"), "ndkjeisgcl", 4, 5, 4);
+    test(S("nbmit"), "rnfpqatdeo", 4, 9, S::npos);
+    test(S("jgmib"), "bntjlqrfik", 4, 10, S::npos);
+    test(S("ncrfj"), "kcrtmpolnaqejghsfdbi", 4, 0, 4);
+    test(S("ncsik"), "lobheanpkmqidsrtcfgj", 4, 1, 4);
+    test(S("sgbfh"), "athdkljcnreqbgpmisof", 4, 10, S::npos);
+    test(S("dktbn"), "qkdmjialrscpbhefgont", 4, 19, S::npos);
+    test(S("fthqm"), "dmasojntqleribkgfchp", 4, 20, S::npos);
+    test(S("klopi"), "", 5, 0, S::npos);
+    test(S("dajhn"), "psthd", 5, 0, S::npos);
+    test(S("jbgno"), "rpmjd", 5, 1, S::npos);
+    test(S("hkjae"), "dfsmk", 5, 2, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S("gbhqo"), "skqne", 5, 4, S::npos);
+    test(S("ktdor"), "kipnf", 5, 5, S::npos);
+    test(S("ldprn"), "hmrnqdgifl", 5, 0, S::npos);
+    test(S("egmjk"), "fsmjcdairn", 5, 1, S::npos);
+    test(S("armql"), "pcdgltbrfj", 5, 5, S::npos);
+    test(S("cdhjo"), "aekfctpirg", 5, 9, S::npos);
+    test(S("jcons"), "ledihrsgpf", 5, 10, S::npos);
+    test(S("cbrkp"), "mqcklahsbtirgopefndj", 5, 0, S::npos);
+    test(S("fhgna"), "kmlthaoqgecrnpdbjfis", 5, 1, S::npos);
+    test(S("ejfcd"), "sfhbamcdptojlkrenqgi", 5, 10, S::npos);
+    test(S("kqjhe"), "pbniofmcedrkhlstgaqj", 5, 19, S::npos);
+    test(S("pbdjl"), "mongjratcskbhqiepfdl", 5, 20, S::npos);
+    test(S("gajqn"), "", 6, 0, S::npos);
+    test(S("stedk"), "hrnat", 6, 0, S::npos);
+    test(S("tjkaf"), "gsqdt", 6, 1, S::npos);
+    test(S("dthpe"), "bspkd", 6, 2, S::npos);
+    test(S("klhde"), "ohcmb", 6, 4, S::npos);
+    test(S("bhlki"), "heatr", 6, 5, S::npos);
+    test(S("lqmoh"), "pmblckedfn", 6, 0, S::npos);
+    test(S("mtqin"), "aceqmsrbik", 6, 1, S::npos);
+    test(S("dpqbr"), "lmbtdehjrn", 6, 5, S::npos);
+    test(S("kdhmo"), "teqmcrlgib", 6, 9, S::npos);
+    test(S("jblqp"), "njolbmspac", 6, 10, S::npos);
+    test(S("qmjgl"), "pofnhidklamecrbqjgst", 6, 0, S::npos);
+    test(S("rothp"), "jbhckmtgrqnosafedpli", 6, 1, S::npos);
+    test(S("ghknq"), "dobntpmqklicsahgjerf", 6, 10, S::npos);
+    test(S("eopfi"), "tpdshainjkbfoemlrgcq", 6, 19, S::npos);
+    test(S("dsnmg"), "oldpfgeakrnitscbjmqh", 6, 20, S::npos);
+    test(S("jnkrfhotgl"), "", 0, 0, 0);
+    test(S("dltjfngbko"), "rqegt", 0, 0, 0);
+    test(S("bmjlpkiqde"), "dashm", 0, 1, 0);
+    test(S("skrflobnqm"), "jqirk", 0, 2, 0);
+    test(S("jkpldtshrm"), "rckeg", 0, 4, 0);
+    test(S("ghasdbnjqo"), "jscie", 0, 5, 0);
+    test(S("igrkhpbqjt"), "efsphndliq", 0, 0, 0);
+    test(S("ikthdgcamf"), "gdicosleja", 0, 1, 0);
+    test(S("pcofgeniam"), "qcpjibosfl", 0, 5, 2);
+    test(S("rlfjgesqhc"), "lrhmefnjcq", 0, 9, 4);
+    test(S("itphbqsker"), "dtablcrseo", 0, 10, 0);
+    test(S("skjafcirqm"), "apckjsftedbhgomrnilq", 0, 0, 0);
+    test(S("tcqomarsfd"), "pcbrgflehjtiadnsokqm", 0, 1, 0);
+    test(S("rocfeldqpk"), "nsiadegjklhobrmtqcpf", 0, 10, 0);
+    test(S("cfpegndlkt"), "cpmajdqnolikhgsbretf", 0, 19, 1);
+    test(S("fqbtnkeasj"), "jcflkntmgiqrphdosaeb", 0, 20, S::npos);
+    test(S("shbcqnmoar"), "", 1, 0, 1);
+    test(S("bdoshlmfin"), "ontrs", 1, 0, 1);
+    test(S("khfrebnsgq"), "pfkna", 1, 1, 1);
+    test(S("getcrsaoji"), "ekosa", 1, 2, 2);
+    test(S("fjiknedcpq"), "anqhk", 1, 4, 1);
+    test(S("tkejgnafrm"), "jekca", 1, 5, 4);
+    test(S("jnakolqrde"), "ikemsjgacf", 1, 0, 1);
+    test(S("lcjptsmgbe"), "arolgsjkhm", 1, 1, 1);
+    test(S("itfsmcjorl"), "oftkbldhre", 1, 5, 3);
+    test(S("omchkfrjea"), "gbkqdoeftl", 1, 9, 1);
+    test(S("cigfqkated"), "sqcflrgtim", 1, 10, 5);
+    test(S("tscenjikml"), "fmhbkislrjdpanogqcet", 1, 0, 1);
+    test(S("qcpaemsinf"), "rnioadktqlgpbcjsmhef", 1, 1, 1);
+    test(S("gltkojeipd"), "oakgtnldpsefihqmjcbr", 1, 10, 5);
+    test(S("qistfrgnmp"), "gbnaelosidmcjqktfhpr", 1, 19, 5);
+    test(S("bdnpfcqaem"), "akbripjhlosndcmqgfet", 1, 20, S::npos);
+    test(S("ectnhskflp"), "", 5, 0, 5);
+    test(S("fgtianblpq"), "pijag", 5, 0, 5);
+    test(S("mfeqklirnh"), "jrckd", 5, 1, 5);
+    test(S("astedncjhk"), "qcloh", 5, 2, 5);
+    test(S("fhlqgcajbr"), "thlmp", 5, 4, 5);
+    test(S("epfhocmdng"), "qidmo", 5, 5, 5);
+    test(S("apcnsibger"), "lnegpsjqrd", 5, 0, 5);
+    test(S("aqkocrbign"), "rjqdablmfs", 5, 1, 6);
+    test(S("ijsmdtqgce"), "enkgpbsjaq", 5, 5, 5);
+    test(S("clobgsrken"), "kdsgoaijfh", 5, 9, 6);
+    test(S("jbhcfposld"), "trfqgmckbe", 5, 10, 5);
+    test(S("oqnpblhide"), "igetsracjfkdnpoblhqm", 5, 0, 5);
+    test(S("lroeasctif"), "nqctfaogirshlekbdjpm", 5, 1, 5);
+    test(S("bpjlgmiedh"), "csehfgomljdqinbartkp", 5, 10, 6);
+    test(S("pamkeoidrj"), "qahoegcmplkfsjbdnitr", 5, 19, 8);
+    test(S("espogqbthk"), "dpteiajrqmsognhlfbkc", 5, 20, S::npos);
+    test(S("shoiedtcjb"), "", 9, 0, 9);
+    test(S("ebcinjgads"), "tqbnh", 9, 0, 9);
+    test(S("dqmregkcfl"), "akmle", 9, 1, 9);
+    test(S("ngcrieqajf"), "iqfkm", 9, 2, 9);
+    test(S("qosmilgnjb"), "tqjsr", 9, 4, 9);
+    test(S("ikabsjtdfl"), "jplqg", 9, 5, S::npos);
+    test(S("ersmicafdh"), "oilnrbcgtj", 9, 0, 9);
+    test(S("fdnplotmgh"), "morkglpesn", 9, 1, 9);
+    test(S("fdbicojerm"), "dmicerngat", 9, 5, S::npos);
+    test(S("mbtafndjcq"), "radgeskbtc", 9, 9, 9);
+    test(S("mlenkpfdtc"), "ljikprsmqo", 9, 10, 9);
+    test(S("ahlcifdqgs"), "trqihkcgsjamfdbolnpe", 9, 0, 9);
+    test(S("bgjemaltks"), "lqmthbsrekajgnofcipd", 9, 1, 9);
+    test(S("pdhslbqrfc"), "jtalmedribkgqsopcnfh", 9, 10, 9);
+    test(S("dirhtsnjkc"), "spqfoiclmtagejbndkrh", 9, 19, S::npos);
+    test(S("dlroktbcja"), "nmotklspigjrdhcfaebq", 9, 20, S::npos);
+    test(S("ncjpmaekbs"), "", 10, 0, S::npos);
+    test(S("hlbosgmrak"), "hpmsd", 10, 0, S::npos);
+    test(S("pqfhsgilen"), "qnpor", 10, 1, S::npos);
+    test(S("gqtjsbdckh"), "otdma", 10, 2, S::npos);
+    test(S("cfkqpjlegi"), "efhjg", 10, 4, S::npos);
+    test(S("beanrfodgj"), "odpte", 10, 5, S::npos);
+    test(S("adtkqpbjfi"), "bctdgfmolr", 10, 0, S::npos);
+    test(S("iomkfthagj"), "oaklidrbqg", 10, 1, S::npos);
+}
+
+template <class S>
+void test2()
+{
+    test(S("sdpcilonqj"), "dnjfsagktr", 10, 5, S::npos);
+    test(S("gtfbdkqeml"), "nejaktmiqg", 10, 9, S::npos);
+    test(S("bmeqgcdorj"), "pjqonlebsf", 10, 10, S::npos);
+    test(S("etqlcanmob"), "dshmnbtolcjepgaikfqr", 10, 0, S::npos);
+    test(S("roqmkbdtia"), "iogfhpabtjkqlrnemcds", 10, 1, S::npos);
+    test(S("kadsithljf"), "ngridfabjsecpqltkmoh", 10, 10, S::npos);
+    test(S("sgtkpbfdmh"), "athmknplcgofrqejsdib", 10, 19, S::npos);
+    test(S("qgmetnabkl"), "ldobhmqcafnjtkeisgrp", 10, 20, S::npos);
+    test(S("cqjohampgd"), "", 11, 0, S::npos);
+    test(S("hobitmpsan"), "aocjb", 11, 0, S::npos);
+    test(S("tjehkpsalm"), "jbrnk", 11, 1, S::npos);
+    test(S("ngfbojitcl"), "tqedg", 11, 2, S::npos);
+    test(S("rcfkdbhgjo"), "nqskp", 11, 4, S::npos);
+    test(S("qghptonrea"), "eaqkl", 11, 5, S::npos);
+    test(S("hnprfgqjdl"), "reaoicljqm", 11, 0, S::npos);
+    test(S("hlmgabenti"), "lsftgajqpm", 11, 1, S::npos);
+    test(S("ofcjanmrbs"), "rlpfogmits", 11, 5, S::npos);
+    test(S("jqedtkornm"), "shkncmiaqj", 11, 9, S::npos);
+    test(S("rfedlasjmg"), "fpnatrhqgs", 11, 10, S::npos);
+    test(S("talpqjsgkm"), "sjclemqhnpdbgikarfot", 11, 0, S::npos);
+    test(S("lrkcbtqpie"), "otcmedjikgsfnqbrhpla", 11, 1, S::npos);
+    test(S("cipogdskjf"), "bonsaefdqiprkhlgtjcm", 11, 10, S::npos);
+    test(S("nqedcojahi"), "egpscmahijlfnkrodqtb", 11, 19, S::npos);
+    test(S("hefnrkmctj"), "kmqbfepjthgilscrndoa", 11, 20, S::npos);
+    test(S("atqirnmekfjolhpdsgcb"), "", 0, 0, 0);
+    test(S("echfkmlpribjnqsaogtd"), "prboq", 0, 0, 0);
+    test(S("qnhiftdgcleajbpkrosm"), "fjcqh", 0, 1, 0);
+    test(S("chamfknorbedjitgslpq"), "fmosa", 0, 2, 0);
+    test(S("njhqpibfmtlkaecdrgso"), "qdbok", 0, 4, 0);
+    test(S("ebnghfsqkprmdcljoiat"), "amslg", 0, 5, 0);
+    test(S("letjomsgihfrpqbkancd"), "smpltjneqb", 0, 0, 0);
+    test(S("nblgoipcrqeaktshjdmf"), "flitskrnge", 0, 1, 0);
+    test(S("cehkbngtjoiflqapsmrd"), "pgqihmlbef", 0, 5, 0);
+    test(S("mignapfoklbhcqjetdrs"), "cfpdqjtgsb", 0, 9, 0);
+    test(S("ceatbhlsqjgpnokfrmdi"), "htpsiaflom", 0, 10, 0);
+    test(S("ocihkjgrdelpfnmastqb"), "kpjfiaceghsrdtlbnomq", 0, 0, 0);
+    test(S("noelgschdtbrjfmiqkap"), "qhtbomidljgafneksprc", 0, 1, 0);
+    test(S("dkclqfombepritjnghas"), "nhtjobkcefldimpsaqgr", 0, 10, 0);
+    test(S("miklnresdgbhqcojftap"), "prabcjfqnoeskilmtgdh", 0, 19, 11);
+    test(S("htbcigojaqmdkfrnlsep"), "dtrgmchilkasqoebfpjn", 0, 20, S::npos);
+    test(S("febhmqtjanokscdirpgl"), "", 1, 0, 1);
+    test(S("loakbsqjpcrdhftniegm"), "sqome", 1, 0, 1);
+    test(S("reagphsqflbitdcjmkno"), "smfte", 1, 1, 1);
+    test(S("jitlfrqemsdhkopncabg"), "ciboh", 1, 2, 2);
+    test(S("mhtaepscdnrjqgbkifol"), "haois", 1, 4, 2);
+    test(S("tocesrfmnglpbjihqadk"), "abfki", 1, 5, 1);
+    test(S("lpfmctjrhdagneskbqoi"), "frdkocntmq", 1, 0, 1);
+    test(S("lsmqaepkdhncirbtjfgo"), "oasbpedlnr", 1, 1, 1);
+    test(S("epoiqmtldrabnkjhcfsg"), "kltqmhgand", 1, 5, 1);
+    test(S("emgasrilpknqojhtbdcf"), "gdtfjchpmr", 1, 9, 3);
+    test(S("hnfiagdpcklrjetqbsom"), "ponmcqblet", 1, 10, 2);
+    test(S("nsdfebgajhmtricpoklq"), "sgphqdnofeiklatbcmjr", 1, 0, 1);
+    test(S("atjgfsdlpobmeiqhncrk"), "ljqprsmigtfoneadckbh", 1, 1, 1);
+    test(S("sitodfgnrejlahcbmqkp"), "ligeojhafnkmrcsqtbdp", 1, 10, 2);
+    test(S("fraghmbiceknltjpqosd"), "lsimqfnjarbopedkhcgt", 1, 19, 13);
+    test(S("pmafenlhqtdbkirjsogc"), "abedmfjlghniorcqptks", 1, 20, S::npos);
+    test(S("pihgmoeqtnakrjslcbfd"), "", 10, 0, 10);
+    test(S("gjdkeprctqblnhiafsom"), "hqtoa", 10, 0, 10);
+    test(S("mkpnblfdsahrcqijteog"), "cahif", 10, 1, 10);
+    test(S("gckarqnelodfjhmbptis"), "kehis", 10, 2, 10);
+    test(S("gqpskidtbclomahnrjfe"), "kdlmh", 10, 4, 11);
+    test(S("pkldjsqrfgitbhmaecno"), "paeql", 10, 5, 10);
+    test(S("aftsijrbeklnmcdqhgop"), "aghoqiefnb", 10, 0, 10);
+    test(S("mtlgdrhafjkbiepqnsoc"), "jrbqaikpdo", 10, 1, 10);
+    test(S("pqgirnaefthokdmbsclj"), "smjonaeqcl", 10, 5, 10);
+    test(S("kpdbgjmtherlsfcqoina"), "eqbdrkcfah", 10, 9, 11);
+    test(S("jrlbothiknqmdgcfasep"), "kapmsienhf", 10, 10, 10);
+    test(S("mjogldqferckabinptsh"), "jpqotrlenfcsbhkaimdg", 10, 0, 10);
+    test(S("apoklnefbhmgqcdrisjt"), "jlbmhnfgtcqprikeados", 10, 1, 10);
+    test(S("ifeopcnrjbhkdgatmqls"), "stgbhfmdaljnpqoicker", 10, 10, 11);
+    test(S("ckqhaiesmjdnrgolbtpf"), "oihcetflbjagdsrkmqpn", 10, 19, 11);
+    test(S("bnlgapfimcoterskqdjh"), "adtclebmnpjsrqfkigoh", 10, 20, S::npos);
+    test(S("kgdlrobpmjcthqsafeni"), "", 19, 0, 19);
+    test(S("dfkechomjapgnslbtqir"), "beafg", 19, 0, 19);
+    test(S("rloadknfbqtgmhcsipje"), "iclat", 19, 1, 19);
+    test(S("mgjhkolrnadqbpetcifs"), "rkhnf", 19, 2, 19);
+    test(S("cmlfakiojdrgtbsphqen"), "clshq", 19, 4, 19);
+    test(S("kghbfipeomsntdalrqjc"), "dtcoj", 19, 5, S::npos);
+    test(S("eldiqckrnmtasbghjfpo"), "rqosnjmfth", 19, 0, 19);
+    test(S("abqjcfedgotihlnspkrm"), "siatdfqglh", 19, 1, 19);
+    test(S("qfbadrtjsimkolcenhpg"), "mrlshtpgjq", 19, 5, 19);
+    test(S("abseghclkjqifmtodrnp"), "adlcskgqjt", 19, 9, 19);
+    test(S("ibmsnlrjefhtdokacqpg"), "drshcjknaf", 19, 10, 19);
+    test(S("mrkfciqjebaponsthldg"), "etsaqroinghpkjdlfcbm", 19, 0, 19);
+    test(S("mjkticdeoqshpalrfbgn"), "sgepdnkqliambtrocfhj", 19, 1, 19);
+    test(S("rqnoclbdejgiphtfsakm"), "nlmcjaqgbsortfdihkpe", 19, 10, S::npos);
+    test(S("plkqbhmtfaeodjcrsing"), "racfnpmosldibqkghjet", 19, 19, S::npos);
+    test(S("oegalhmstjrfickpbndq"), "fjhdsctkqeiolagrnmbp", 19, 20, S::npos);
+    test(S("rdtgjcaohpblniekmsfq"), "", 20, 0, S::npos);
+    test(S("ofkqbnjetrmsaidphglc"), "ejanp", 20, 0, S::npos);
+    test(S("grkpahljcftesdmonqib"), "odife", 20, 1, S::npos);
+    test(S("jimlgbhfqkteospardcn"), "okaqd", 20, 2, S::npos);
+    test(S("gftenihpmslrjkqadcob"), "lcdbi", 20, 4, S::npos);
+    test(S("bmhldogtckrfsanijepq"), "fsqbj", 20, 5, S::npos);
+    test(S("nfqkrpjdesabgtlcmoih"), "bigdomnplq", 20, 0, S::npos);
+    test(S("focalnrpiqmdkstehbjg"), "apiblotgcd", 20, 1, S::npos);
+    test(S("rhqdspkmebiflcotnjga"), "acfhdenops", 20, 5, S::npos);
+    test(S("rahdtmsckfboqlpniegj"), "jopdeamcrk", 20, 9, S::npos);
+    test(S("fbkeiopclstmdqranjhg"), "trqncbkgmh", 20, 10, S::npos);
+    test(S("lifhpdgmbconstjeqark"), "tomglrkencbsfjqpihda", 20, 0, S::npos);
+}
+
+template <class S>
+void test3()
+{
+    test(S("pboqganrhedjmltsicfk"), "gbkhdnpoietfcmrslajq", 20, 1, S::npos);
+    test(S("klchabsimetjnqgorfpd"), "rtfnmbsglkjaichoqedp", 20, 10, S::npos);
+    test(S("sirfgmjqhctndbklaepo"), "ohkmdpfqbsacrtjnlgei", 20, 19, S::npos);
+    test(S("rlbdsiceaonqjtfpghkm"), "dlbrteoisgphmkncajfq", 20, 20, S::npos);
+    test(S("ecgdanriptblhjfqskom"), "", 21, 0, S::npos);
+    test(S("fdmiarlpgcskbhoteqjn"), "sjrlo", 21, 0, S::npos);
+    test(S("rlbstjqopignecmfadkh"), "qjpor", 21, 1, S::npos);
+    test(S("grjpqmbshektdolcafni"), "odhfn", 21, 2, S::npos);
+    test(S("sakfcohtqnibprjmlged"), "qtfin", 21, 4, S::npos);
+    test(S("mjtdglasihqpocebrfkn"), "hpqfo", 21, 5, S::npos);
+    test(S("okaplfrntghqbmeicsdj"), "fabmertkos", 21, 0, S::npos);
+    test(S("sahngemrtcjidqbklfpo"), "brqtgkmaej", 21, 1, S::npos);
+    test(S("dlmsipcnekhbgoaftqjr"), "nfrdeihsgl", 21, 5, S::npos);
+    test(S("ahegrmqnoiklpfsdbcjt"), "hlfrosekpi", 21, 9, S::npos);
+    test(S("hdsjbnmlegtkqripacof"), "atgbkrjdsm", 21, 10, S::npos);
+    test(S("pcnedrfjihqbalkgtoms"), "blnrptjgqmaifsdkhoec", 21, 0, S::npos);
+    test(S("qjidealmtpskrbfhocng"), "ctpmdahebfqjgknloris", 21, 1, S::npos);
+    test(S("qeindtagmokpfhsclrbj"), "apnkeqthrmlbfodiscgj", 21, 10, S::npos);
+    test(S("kpfegbjhsrnodltqciam"), "jdgictpframeoqlsbknh", 21, 19, S::npos);
+    test(S("hnbrcplsjfgiktoedmaq"), "qprlsfojamgndekthibc", 21, 20, S::npos);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test0<S>();
+    test1<S>();
+    test2<S>();
+    test3<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_first_not_of( "",      0, 0) == SV::npos, "" );
+    static_assert (sv1.find_first_not_of( "irkhs", 0, 5) == SV::npos, "" );
+    static_assert (sv2.find_first_not_of( "",      0, 0) == 0, "" );
+    static_assert (sv2.find_first_not_of( "gfsrt", 0, 5) == 0, "" );
+    static_assert (sv2.find_first_not_of( "lecar", 0, 5) == 1, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.find/find_first_not_of_string_view_size.pass.cpp

@@ -0,0 +1,148 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// size_type find_first_not_of(const basic_string& str, size_type pos = 0) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type pos, typename S::size_type x)
+{
+    assert(s.find_first_not_of(str, pos) == x);
+    if (x != S::npos)
+        assert(pos <= x && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type x)
+{
+    assert(s.find_first_not_of(str) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), S(""), 0, S::npos);
+    test(S(""), S("laenf"), 0, S::npos);
+    test(S(""), S("pqlnkmbdjo"), 0, S::npos);
+    test(S(""), S("qkamfogpnljdcshbreti"), 0, S::npos);
+    test(S(""), S(""), 1, S::npos);
+    test(S(""), S("bjaht"), 1, S::npos);
+    test(S(""), S("hjlcmgpket"), 1, S::npos);
+    test(S(""), S("htaobedqikfplcgjsmrn"), 1, S::npos);
+    test(S("fodgq"), S(""), 0, 0);
+    test(S("qanej"), S("dfkap"), 0, 0);
+    test(S("clbao"), S("ihqrfebgad"), 0, 0);
+    test(S("mekdn"), S("ngtjfcalbseiqrphmkdo"), 0, S::npos);
+    test(S("srdfq"), S(""), 1, 1);
+    test(S("oemth"), S("ikcrq"), 1, 1);
+    test(S("cdaih"), S("dmajblfhsg"), 1, 3);
+    test(S("qohtk"), S("oqftjhdmkgsblacenirp"), 1, S::npos);
+    test(S("cshmd"), S(""), 2, 2);
+    test(S("lhcdo"), S("oebqi"), 2, 2);
+    test(S("qnsoh"), S("kojhpmbsfe"), 2, S::npos);
+    test(S("pkrof"), S("acbsjqogpltdkhinfrem"), 2, S::npos);
+    test(S("fmtsp"), S(""), 4, 4);
+    test(S("khbpm"), S("aobjd"), 4, 4);
+    test(S("pbsji"), S("pcbahntsje"), 4, 4);
+    test(S("mprdj"), S("fhepcrntkoagbmldqijs"), 4, S::npos);
+    test(S("eqmpa"), S(""), 5, S::npos);
+    test(S("omigs"), S("kocgb"), 5, S::npos);
+    test(S("onmje"), S("fbslrjiqkm"), 5, S::npos);
+    test(S("oqmrj"), S("jeidpcmalhfnqbgtrsko"), 5, S::npos);
+    test(S("schfa"), S(""), 6, S::npos);
+    test(S("igdsc"), S("qngpd"), 6, S::npos);
+    test(S("brqgo"), S("rodhqklgmb"), 6, S::npos);
+    test(S("tnrph"), S("thdjgafrlbkoiqcspmne"), 6, S::npos);
+    test(S("hcjitbfapl"), S(""), 0, 0);
+    test(S("daiprenocl"), S("ashjd"), 0, 2);
+    test(S("litpcfdghe"), S("mgojkldsqh"), 0, 1);
+    test(S("aidjksrolc"), S("imqnaghkfrdtlopbjesc"), 0, S::npos);
+    test(S("qpghtfbaji"), S(""), 1, 1);
+    test(S("gfshlcmdjr"), S("nadkh"), 1, 1);
+    test(S("nkodajteqp"), S("ofdrqmkebl"), 1, 4);
+    test(S("gbmetiprqd"), S("bdfjqgatlksriohemnpc"), 1, S::npos);
+    test(S("crnklpmegd"), S(""), 5, 5);
+    test(S("jsbtafedoc"), S("prqgn"), 5, 5);
+    test(S("qnmodrtkeb"), S("pejafmnokr"), 5, 6);
+    test(S("cpebqsfmnj"), S("odnqkgijrhabfmcestlp"), 5, S::npos);
+    test(S("lmofqdhpki"), S(""), 9, 9);
+    test(S("hnefkqimca"), S("rtjpa"), 9, S::npos);
+    test(S("drtasbgmfp"), S("ktsrmnqagd"), 9, 9);
+    test(S("lsaijeqhtr"), S("rtdhgcisbnmoaqkfpjle"), 9, S::npos);
+    test(S("elgofjmbrq"), S(""), 10, S::npos);
+    test(S("mjqdgalkpc"), S("dplqa"), 10, S::npos);
+    test(S("kthqnfcerm"), S("dkacjoptns"), 10, S::npos);
+    test(S("dfsjhanorc"), S("hqfimtrgnbekpdcsjalo"), 10, S::npos);
+    test(S("eqsgalomhb"), S(""), 11, S::npos);
+    test(S("akiteljmoh"), S("lofbc"), 11, S::npos);
+    test(S("hlbdfreqjo"), S("astoegbfpn"), 11, S::npos);
+    test(S("taqobhlerg"), S("pdgreqomsncafklhtibj"), 11, S::npos);
+    test(S("snafbdlghrjkpqtoceim"), S(""), 0, 0);
+    test(S("aemtbrgcklhndjisfpoq"), S("lbtqd"), 0, 0);
+    test(S("pnracgfkjdiholtbqsem"), S("tboimldpjh"), 0, 1);
+    test(S("dicfltehbsgrmojnpkaq"), S("slcerthdaiqjfnobgkpm"), 0, S::npos);
+    test(S("jlnkraeodhcspfgbqitm"), S(""), 1, 1);
+    test(S("lhosrngtmfjikbqpcade"), S("aqibs"), 1, 1);
+    test(S("rbtaqjhgkneisldpmfoc"), S("gtfblmqinc"), 1, 3);
+    test(S("gpifsqlrdkbonjtmheca"), S("mkqpbtdalgniorhfescj"), 1, S::npos);
+    test(S("hdpkobnsalmcfijregtq"), S(""), 10, 10);
+    test(S("jtlshdgqaiprkbcoenfm"), S("pblas"), 10, 11);
+    test(S("fkdrbqltsgmcoiphneaj"), S("arosdhcfme"), 10, 13);
+    test(S("crsplifgtqedjohnabmk"), S("blkhjeogicatqfnpdmsr"), 10, S::npos);
+    test(S("niptglfbosehkamrdqcj"), S(""), 19, 19);
+    test(S("copqdhstbingamjfkler"), S("djkqc"), 19, 19);
+    test(S("mrtaefilpdsgocnhqbjk"), S("lgokshjtpb"), 19, S::npos);
+    test(S("kojatdhlcmigpbfrqnes"), S("bqjhtkfepimcnsgrlado"), 19, S::npos);
+    test(S("eaintpchlqsbdgrkjofm"), S(""), 20, S::npos);
+    test(S("gjnhidfsepkrtaqbmclo"), S("nocfa"), 20, S::npos);
+    test(S("spocfaktqdbiejlhngmr"), S("bgtajmiedc"), 20, S::npos);
+    test(S("rphmlekgfscndtaobiqj"), S("lsckfnqgdahejiopbtmr"), 20, S::npos);
+    test(S("liatsqdoegkmfcnbhrpj"), S(""), 21, S::npos);
+    test(S("binjagtfldkrspcomqeh"), S("gfsrt"), 21, S::npos);
+    test(S("latkmisecnorjbfhqpdg"), S("pfsocbhjtm"), 21, S::npos);
+    test(S("lecfratdjkhnsmqpoigb"), S("tpflmdnoicjgkberhqsa"), 21, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), S(""), S::npos);
+    test(S(""), S("laenf"), S::npos);
+    test(S(""), S("pqlnkmbdjo"), S::npos);
+    test(S(""), S("qkamfogpnljdcshbreti"), S::npos);
+    test(S("nhmko"), S(""), 0);
+    test(S("lahfb"), S("irkhs"), 0);
+    test(S("gmfhd"), S("kantesmpgj"), 2);
+    test(S("odaft"), S("oknlrstdpiqmjbaghcfe"), S::npos);
+    test(S("eolhfgpjqk"), S(""), 0);
+    test(S("nbatdlmekr"), S("bnrpe"), 2);
+    test(S("jdmciepkaq"), S("jtdaefblso"), 2);
+    test(S("hkbgspoflt"), S("oselktgbcapndfjihrmq"), S::npos);
+    test(S("gprdcokbnjhlsfmtieqa"), S(""), 0);
+    test(S("qjghlnftcaismkropdeb"), S("bjaht"), 0);
+    test(S("pnalfrdtkqcmojiesbhg"), S("hjlcmgpket"), 1);
+    test(S("pniotcfrhqsmgdkjbael"), S("htaobedqikfplcgjsmrn"), S::npos);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+}

test/experimental/string.view/string.view.find/find_first_of_char_size.pass.cpp

@@ -0,0 +1,82 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// constexpr size_type find_first_of(charT c, size_type pos = 0) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.find_first_of(c, pos) == x);
+    if (x != S::npos)
+        assert(pos <= x && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type x)
+{
+    assert(s.find_first_of(c) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test(S(""), 'e', 0, S::npos);
+    test(S(""), 'e', 1, S::npos);
+    test(S("kitcj"), 'e', 0, S::npos);
+    test(S("qkamf"), 'e', 1, S::npos);
+    test(S("nhmko"), 'e', 2, S::npos);
+    test(S("tpsaf"), 'e', 4, S::npos);
+    test(S("lahfb"), 'e', 5, S::npos);
+    test(S("irkhs"), 'e', 6, S::npos);
+    test(S("gmfhdaipsr"), 'e', 0, S::npos);
+    test(S("kantesmpgj"), 'e', 1, 4);
+    test(S("odaftiegpm"), 'e', 5, 6);
+    test(S("oknlrstdpi"), 'e', 9, S::npos);
+    test(S("eolhfgpjqk"), 'e', 10, S::npos);
+    test(S("pcdrofikas"), 'e', 11, S::npos);
+    test(S("nbatdlmekrgcfqsophij"), 'e', 0, 7);
+    test(S("bnrpehidofmqtcksjgla"), 'e', 1, 4);
+    test(S("jdmciepkaqgotsrfnhlb"), 'e', 10, S::npos);
+    test(S("jtdaefblsokrmhpgcnqi"), 'e', 19, S::npos);
+    test(S("hkbgspofltajcnedqmri"), 'e', 20, S::npos);
+    test(S("oselktgbcapndfjihrmq"), 'e', 21, S::npos);
+
+    test(S(""), 'e', S::npos);
+    test(S("csope"), 'e', 4);
+    test(S("gfsmthlkon"), 'e', S::npos);
+    test(S("laenfsbridchgotmkqpj"), 'e', 2);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_first_of( 'e', 0 ) == SV::npos, "" );
+    static_assert (sv1.find_first_of( 'e', 1 ) == SV::npos, "" );
+    static_assert (sv2.find_first_of( 'q', 0 ) == SV::npos, "" );
+    static_assert (sv2.find_first_of( 'e', 1 ) == 4, "" );
+    static_assert (sv2.find_first_of( 'e', 5 ) == SV::npos, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.find/find_first_of_pointer_size.pass.cpp

@@ -0,0 +1,165 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// constexpr size_type find_first_of(const charT* s, size_type pos = 0) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.find_first_of(str, pos) == x);
+    if (x != S::npos)
+        assert(pos <= x && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type x)
+{
+    assert(s.find_first_of(str) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, S::npos);
+    test(S(""), "laenf", 0, S::npos);
+    test(S(""), "pqlnkmbdjo", 0, S::npos);
+    test(S(""), "qkamfogpnljdcshbreti", 0, S::npos);
+    test(S(""), "", 1, S::npos);
+    test(S(""), "bjaht", 1, S::npos);
+    test(S(""), "hjlcmgpket", 1, S::npos);
+    test(S(""), "htaobedqikfplcgjsmrn", 1, S::npos);
+    test(S("fodgq"), "", 0, S::npos);
+    test(S("qanej"), "dfkap", 0, 1);
+    test(S("clbao"), "ihqrfebgad", 0, 2);
+    test(S("mekdn"), "ngtjfcalbseiqrphmkdo", 0, 0);
+    test(S("srdfq"), "", 1, S::npos);
+    test(S("oemth"), "ikcrq", 1, S::npos);
+    test(S("cdaih"), "dmajblfhsg", 1, 1);
+    test(S("qohtk"), "oqftjhdmkgsblacenirp", 1, 1);
+    test(S("cshmd"), "", 2, S::npos);
+    test(S("lhcdo"), "oebqi", 2, 4);
+    test(S("qnsoh"), "kojhpmbsfe", 2, 2);
+    test(S("pkrof"), "acbsjqogpltdkhinfrem", 2, 2);
+    test(S("fmtsp"), "", 4, S::npos);
+    test(S("khbpm"), "aobjd", 4, S::npos);
+    test(S("pbsji"), "pcbahntsje", 4, S::npos);
+    test(S("mprdj"), "fhepcrntkoagbmldqijs", 4, 4);
+    test(S("eqmpa"), "", 5, S::npos);
+    test(S("omigs"), "kocgb", 5, S::npos);
+    test(S("onmje"), "fbslrjiqkm", 5, S::npos);
+    test(S("oqmrj"), "jeidpcmalhfnqbgtrsko", 5, S::npos);
+    test(S("schfa"), "", 6, S::npos);
+    test(S("igdsc"), "qngpd", 6, S::npos);
+    test(S("brqgo"), "rodhqklgmb", 6, S::npos);
+    test(S("tnrph"), "thdjgafrlbkoiqcspmne", 6, S::npos);
+    test(S("hcjitbfapl"), "", 0, S::npos);
+    test(S("daiprenocl"), "ashjd", 0, 0);
+    test(S("litpcfdghe"), "mgojkldsqh", 0, 0);
+    test(S("aidjksrolc"), "imqnaghkfrdtlopbjesc", 0, 0);
+    test(S("qpghtfbaji"), "", 1, S::npos);
+    test(S("gfshlcmdjr"), "nadkh", 1, 3);
+    test(S("nkodajteqp"), "ofdrqmkebl", 1, 1);
+    test(S("gbmetiprqd"), "bdfjqgatlksriohemnpc", 1, 1);
+    test(S("crnklpmegd"), "", 5, S::npos);
+    test(S("jsbtafedoc"), "prqgn", 5, S::npos);
+    test(S("qnmodrtkeb"), "pejafmnokr", 5, 5);
+    test(S("cpebqsfmnj"), "odnqkgijrhabfmcestlp", 5, 5);
+    test(S("lmofqdhpki"), "", 9, S::npos);
+    test(S("hnefkqimca"), "rtjpa", 9, 9);
+    test(S("drtasbgmfp"), "ktsrmnqagd", 9, S::npos);
+    test(S("lsaijeqhtr"), "rtdhgcisbnmoaqkfpjle", 9, 9);
+    test(S("elgofjmbrq"), "", 10, S::npos);
+    test(S("mjqdgalkpc"), "dplqa", 10, S::npos);
+    test(S("kthqnfcerm"), "dkacjoptns", 10, S::npos);
+    test(S("dfsjhanorc"), "hqfimtrgnbekpdcsjalo", 10, S::npos);
+    test(S("eqsgalomhb"), "", 11, S::npos);
+    test(S("akiteljmoh"), "lofbc", 11, S::npos);
+    test(S("hlbdfreqjo"), "astoegbfpn", 11, S::npos);
+    test(S("taqobhlerg"), "pdgreqomsncafklhtibj", 11, S::npos);
+    test(S("snafbdlghrjkpqtoceim"), "", 0, S::npos);
+    test(S("aemtbrgcklhndjisfpoq"), "lbtqd", 0, 3);
+    test(S("pnracgfkjdiholtbqsem"), "tboimldpjh", 0, 0);
+    test(S("dicfltehbsgrmojnpkaq"), "slcerthdaiqjfnobgkpm", 0, 0);
+    test(S("jlnkraeodhcspfgbqitm"), "", 1, S::npos);
+    test(S("lhosrngtmfjikbqpcade"), "aqibs", 1, 3);
+    test(S("rbtaqjhgkneisldpmfoc"), "gtfblmqinc", 1, 1);
+    test(S("gpifsqlrdkbonjtmheca"), "mkqpbtdalgniorhfescj", 1, 1);
+    test(S("hdpkobnsalmcfijregtq"), "", 10, S::npos);
+    test(S("jtlshdgqaiprkbcoenfm"), "pblas", 10, 10);
+    test(S("fkdrbqltsgmcoiphneaj"), "arosdhcfme", 10, 10);
+    test(S("crsplifgtqedjohnabmk"), "blkhjeogicatqfnpdmsr", 10, 10);
+    test(S("niptglfbosehkamrdqcj"), "", 19, S::npos);
+    test(S("copqdhstbingamjfkler"), "djkqc", 19, S::npos);
+    test(S("mrtaefilpdsgocnhqbjk"), "lgokshjtpb", 19, 19);
+    test(S("kojatdhlcmigpbfrqnes"), "bqjhtkfepimcnsgrlado", 19, 19);
+    test(S("eaintpchlqsbdgrkjofm"), "", 20, S::npos);
+    test(S("gjnhidfsepkrtaqbmclo"), "nocfa", 20, S::npos);
+    test(S("spocfaktqdbiejlhngmr"), "bgtajmiedc", 20, S::npos);
+    test(S("rphmlekgfscndtaobiqj"), "lsckfnqgdahejiopbtmr", 20, S::npos);
+    test(S("liatsqdoegkmfcnbhrpj"), "", 21, S::npos);
+    test(S("binjagtfldkrspcomqeh"), "gfsrt", 21, S::npos);
+    test(S("latkmisecnorjbfhqpdg"), "pfsocbhjtm", 21, S::npos);
+    test(S("lecfratdjkhnsmqpoigb"), "tpflmdnoicjgkberhqsa", 21, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), "", S::npos);
+    test(S(""), "laenf", S::npos);
+    test(S(""), "pqlnkmbdjo", S::npos);
+    test(S(""), "qkamfogpnljdcshbreti", S::npos);
+    test(S("nhmko"), "", S::npos);
+    test(S("lahfb"), "irkhs", 2);
+    test(S("gmfhd"), "kantesmpgj", 0);
+    test(S("odaft"), "oknlrstdpiqmjbaghcfe", 0);
+    test(S("eolhfgpjqk"), "", S::npos);
+    test(S("nbatdlmekr"), "bnrpe", 0);
+    test(S("jdmciepkaq"), "jtdaefblso", 0);
+    test(S("hkbgspoflt"), "oselktgbcapndfjihrmq", 0);
+    test(S("gprdcokbnjhlsfmtieqa"), "", S::npos);
+    test(S("qjghlnftcaismkropdeb"), "bjaht", 1);
+    test(S("pnalfrdtkqcmojiesbhg"), "hjlcmgpket", 0);
+    test(S("pniotcfrhqsmgdkjbael"), "htaobedqikfplcgjsmrn", 0);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_first_of( "",      0) == SV::npos, "" );
+    static_assert (sv1.find_first_of( "irkhs", 0) == SV::npos, "" );
+    static_assert (sv2.find_first_of( "",      0) == SV::npos, "" );
+    static_assert (sv2.find_first_of( "gfsrt", 0) == SV::npos, "" );
+    static_assert (sv2.find_first_of( "lecar", 0) == 0, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.find/find_first_of_pointer_size_size.pass.cpp

@@ -0,0 +1,392 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// constexpr size_type find_first_of(const charT* s, size_type pos, size_type n) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type n, typename S::size_type x)
+{
+    assert(s.find_first_of(str, pos, n) == x);
+    if (x != S::npos)
+        assert(pos <= x && x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, 0, S::npos);
+    test(S(""), "irkhs", 0, 0, S::npos);
+    test(S(""), "kante", 0, 1, S::npos);
+    test(S(""), "oknlr", 0, 2, S::npos);
+    test(S(""), "pcdro", 0, 4, S::npos);
+    test(S(""), "bnrpe", 0, 5, S::npos);
+    test(S(""), "jtdaefblso", 0, 0, S::npos);
+    test(S(""), "oselktgbca", 0, 1, S::npos);
+    test(S(""), "eqgaplhckj", 0, 5, S::npos);
+    test(S(""), "bjahtcmnlp", 0, 9, S::npos);
+    test(S(""), "hjlcmgpket", 0, 10, S::npos);
+    test(S(""), "htaobedqikfplcgjsmrn", 0, 0, S::npos);
+    test(S(""), "hpqiarojkcdlsgnmfetb", 0, 1, S::npos);
+    test(S(""), "dfkaprhjloqetcsimnbg", 0, 10, S::npos);
+    test(S(""), "ihqrfebgadntlpmjksoc", 0, 19, S::npos);
+    test(S(""), "ngtjfcalbseiqrphmkdo", 0, 20, S::npos);
+    test(S(""), "", 1, 0, S::npos);
+    test(S(""), "lbtqd", 1, 0, S::npos);
+    test(S(""), "tboim", 1, 1, S::npos);
+    test(S(""), "slcer", 1, 2, S::npos);
+    test(S(""), "cbjfs", 1, 4, S::npos);
+    test(S(""), "aqibs", 1, 5, S::npos);
+    test(S(""), "gtfblmqinc", 1, 0, S::npos);
+    test(S(""), "mkqpbtdalg", 1, 1, S::npos);
+    test(S(""), "kphatlimcd", 1, 5, S::npos);
+    test(S(""), "pblasqogic", 1, 9, S::npos);
+    test(S(""), "arosdhcfme", 1, 10, S::npos);
+    test(S(""), "blkhjeogicatqfnpdmsr", 1, 0, S::npos);
+    test(S(""), "bmhineprjcoadgstflqk", 1, 1, S::npos);
+    test(S(""), "djkqcmetslnghpbarfoi", 1, 10, S::npos);
+    test(S(""), "lgokshjtpbemarcdqnfi", 1, 19, S::npos);
+    test(S(""), "bqjhtkfepimcnsgrlado", 1, 20, S::npos);
+    test(S("eaint"), "", 0, 0, S::npos);
+    test(S("binja"), "gfsrt", 0, 0, S::npos);
+    test(S("latkm"), "pfsoc", 0, 1, S::npos);
+    test(S("lecfr"), "tpflm", 0, 2, S::npos);
+    test(S("eqkst"), "sgkec", 0, 4, 0);
+    test(S("cdafr"), "romds", 0, 5, 1);
+    test(S("prbhe"), "qhjistlgmr", 0, 0, S::npos);
+    test(S("lbisk"), "pedfirsglo", 0, 1, S::npos);
+    test(S("hrlpd"), "aqcoslgrmk", 0, 5, S::npos);
+    test(S("ehmja"), "dabckmepqj", 0, 9, 0);
+    test(S("mhqgd"), "pqscrjthli", 0, 10, 1);
+    test(S("tgklq"), "kfphdcsjqmobliagtren", 0, 0, S::npos);
+    test(S("bocjs"), "rokpefncljibsdhqtagm", 0, 1, S::npos);
+    test(S("grbsd"), "afionmkphlebtcjqsgrd", 0, 10, S::npos);
+    test(S("ofjqr"), "aenmqplidhkofrjbctsg", 0, 19, 0);
+    test(S("btlfi"), "osjmbtcadhiklegrpqnf", 0, 20, 0);
+    test(S("clrgb"), "", 1, 0, S::npos);
+    test(S("tjmek"), "osmia", 1, 0, S::npos);
+    test(S("bgstp"), "ckonl", 1, 1, S::npos);
+    test(S("hstrk"), "ilcaj", 1, 2, S::npos);
+    test(S("kmspj"), "lasiq", 1, 4, 2);
+    test(S("tjboh"), "kfqmr", 1, 5, S::npos);
+    test(S("ilbcj"), "klnitfaobg", 1, 0, S::npos);
+    test(S("jkngf"), "gjhmdlqikp", 1, 1, 3);
+    test(S("gfcql"), "skbgtahqej", 1, 5, S::npos);
+    test(S("dqtlg"), "bjsdgtlpkf", 1, 9, 2);
+    test(S("bthpg"), "bjgfmnlkio", 1, 10, 4);
+    test(S("dgsnq"), "lbhepotfsjdqigcnamkr", 1, 0, S::npos);
+    test(S("rmfhp"), "tebangckmpsrqdlfojhi", 1, 1, S::npos);
+    test(S("jfdam"), "joflqbdkhtegimscpanr", 1, 10, 1);
+    test(S("edapb"), "adpmcohetfbsrjinlqkg", 1, 19, 1);
+    test(S("brfsm"), "iacldqjpfnogbsrhmetk", 1, 20, 1);
+    test(S("ndrhl"), "", 2, 0, S::npos);
+    test(S("mrecp"), "otkgb", 2, 0, S::npos);
+    test(S("qlasf"), "cqsjl", 2, 1, S::npos);
+    test(S("smaqd"), "dpifl", 2, 2, 4);
+    test(S("hjeni"), "oapht", 2, 4, S::npos);
+    test(S("ocmfj"), "cifts", 2, 5, 3);
+    test(S("hmftq"), "nmsckbgalo", 2, 0, S::npos);
+    test(S("fklad"), "tpksqhamle", 2, 1, S::npos);
+    test(S("dirnm"), "tpdrchmkji", 2, 5, 2);
+    test(S("hrgdc"), "ijagfkblst", 2, 9, 2);
+    test(S("ifakg"), "kpocsignjb", 2, 10, 3);
+    test(S("ebrgd"), "pecqtkjsnbdrialgmohf", 2, 0, S::npos);
+    test(S("rcjml"), "aiortphfcmkjebgsndql", 2, 1, S::npos);
+    test(S("peqmt"), "sdbkeamglhipojqftrcn", 2, 10, 3);
+    test(S("frehn"), "ljqncehgmfktroapidbs", 2, 19, 2);
+    test(S("tqolf"), "rtcfodilamkbenjghqps", 2, 20, 2);
+    test(S("cjgao"), "", 4, 0, S::npos);
+    test(S("kjplq"), "mabns", 4, 0, S::npos);
+    test(S("herni"), "bdnrp", 4, 1, S::npos);
+    test(S("tadrb"), "scidp", 4, 2, S::npos);
+    test(S("pkfeo"), "agbjl", 4, 4, S::npos);
+    test(S("hoser"), "jfmpr", 4, 5, 4);
+    test(S("kgrsp"), "rbpefghsmj", 4, 0, S::npos);
+    test(S("pgejb"), "apsfntdoqc", 4, 1, S::npos);
+    test(S("thlnq"), "ndkjeisgcl", 4, 5, S::npos);
+    test(S("nbmit"), "rnfpqatdeo", 4, 9, 4);
+    test(S("jgmib"), "bntjlqrfik", 4, 10, 4);
+    test(S("ncrfj"), "kcrtmpolnaqejghsfdbi", 4, 0, S::npos);
+    test(S("ncsik"), "lobheanpkmqidsrtcfgj", 4, 1, S::npos);
+    test(S("sgbfh"), "athdkljcnreqbgpmisof", 4, 10, 4);
+    test(S("dktbn"), "qkdmjialrscpbhefgont", 4, 19, 4);
+    test(S("fthqm"), "dmasojntqleribkgfchp", 4, 20, 4);
+    test(S("klopi"), "", 5, 0, S::npos);
+    test(S("dajhn"), "psthd", 5, 0, S::npos);
+    test(S("jbgno"), "rpmjd", 5, 1, S::npos);
+    test(S("hkjae"), "dfsmk", 5, 2, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S("gbhqo"), "skqne", 5, 4, S::npos);
+    test(S("ktdor"), "kipnf", 5, 5, S::npos);
+    test(S("ldprn"), "hmrnqdgifl", 5, 0, S::npos);
+    test(S("egmjk"), "fsmjcdairn", 5, 1, S::npos);
+    test(S("armql"), "pcdgltbrfj", 5, 5, S::npos);
+    test(S("cdhjo"), "aekfctpirg", 5, 9, S::npos);
+    test(S("jcons"), "ledihrsgpf", 5, 10, S::npos);
+    test(S("cbrkp"), "mqcklahsbtirgopefndj", 5, 0, S::npos);
+    test(S("fhgna"), "kmlthaoqgecrnpdbjfis", 5, 1, S::npos);
+    test(S("ejfcd"), "sfhbamcdptojlkrenqgi", 5, 10, S::npos);
+    test(S("kqjhe"), "pbniofmcedrkhlstgaqj", 5, 19, S::npos);
+    test(S("pbdjl"), "mongjratcskbhqiepfdl", 5, 20, S::npos);
+    test(S("gajqn"), "", 6, 0, S::npos);
+    test(S("stedk"), "hrnat", 6, 0, S::npos);
+    test(S("tjkaf"), "gsqdt", 6, 1, S::npos);
+    test(S("dthpe"), "bspkd", 6, 2, S::npos);
+    test(S("klhde"), "ohcmb", 6, 4, S::npos);
+    test(S("bhlki"), "heatr", 6, 5, S::npos);
+    test(S("lqmoh"), "pmblckedfn", 6, 0, S::npos);
+    test(S("mtqin"), "aceqmsrbik", 6, 1, S::npos);
+    test(S("dpqbr"), "lmbtdehjrn", 6, 5, S::npos);
+    test(S("kdhmo"), "teqmcrlgib", 6, 9, S::npos);
+    test(S("jblqp"), "njolbmspac", 6, 10, S::npos);
+    test(S("qmjgl"), "pofnhidklamecrbqjgst", 6, 0, S::npos);
+    test(S("rothp"), "jbhckmtgrqnosafedpli", 6, 1, S::npos);
+    test(S("ghknq"), "dobntpmqklicsahgjerf", 6, 10, S::npos);
+    test(S("eopfi"), "tpdshainjkbfoemlrgcq", 6, 19, S::npos);
+    test(S("dsnmg"), "oldpfgeakrnitscbjmqh", 6, 20, S::npos);
+    test(S("jnkrfhotgl"), "", 0, 0, S::npos);
+    test(S("dltjfngbko"), "rqegt", 0, 0, S::npos);
+    test(S("bmjlpkiqde"), "dashm", 0, 1, 8);
+    test(S("skrflobnqm"), "jqirk", 0, 2, 8);
+    test(S("jkpldtshrm"), "rckeg", 0, 4, 1);
+    test(S("ghasdbnjqo"), "jscie", 0, 5, 3);
+    test(S("igrkhpbqjt"), "efsphndliq", 0, 0, S::npos);
+    test(S("ikthdgcamf"), "gdicosleja", 0, 1, 5);
+    test(S("pcofgeniam"), "qcpjibosfl", 0, 5, 0);
+    test(S("rlfjgesqhc"), "lrhmefnjcq", 0, 9, 0);
+    test(S("itphbqsker"), "dtablcrseo", 0, 10, 1);
+    test(S("skjafcirqm"), "apckjsftedbhgomrnilq", 0, 0, S::npos);
+    test(S("tcqomarsfd"), "pcbrgflehjtiadnsokqm", 0, 1, S::npos);
+    test(S("rocfeldqpk"), "nsiadegjklhobrmtqcpf", 0, 10, 4);
+    test(S("cfpegndlkt"), "cpmajdqnolikhgsbretf", 0, 19, 0);
+    test(S("fqbtnkeasj"), "jcflkntmgiqrphdosaeb", 0, 20, 0);
+    test(S("shbcqnmoar"), "", 1, 0, S::npos);
+    test(S("bdoshlmfin"), "ontrs", 1, 0, S::npos);
+    test(S("khfrebnsgq"), "pfkna", 1, 1, S::npos);
+    test(S("getcrsaoji"), "ekosa", 1, 2, 1);
+    test(S("fjiknedcpq"), "anqhk", 1, 4, 4);
+    test(S("tkejgnafrm"), "jekca", 1, 5, 1);
+    test(S("jnakolqrde"), "ikemsjgacf", 1, 0, S::npos);
+    test(S("lcjptsmgbe"), "arolgsjkhm", 1, 1, S::npos);
+    test(S("itfsmcjorl"), "oftkbldhre", 1, 5, 1);
+    test(S("omchkfrjea"), "gbkqdoeftl", 1, 9, 4);
+    test(S("cigfqkated"), "sqcflrgtim", 1, 10, 1);
+    test(S("tscenjikml"), "fmhbkislrjdpanogqcet", 1, 0, S::npos);
+    test(S("qcpaemsinf"), "rnioadktqlgpbcjsmhef", 1, 1, S::npos);
+    test(S("gltkojeipd"), "oakgtnldpsefihqmjcbr", 1, 10, 1);
+    test(S("qistfrgnmp"), "gbnaelosidmcjqktfhpr", 1, 19, 1);
+    test(S("bdnpfcqaem"), "akbripjhlosndcmqgfet", 1, 20, 1);
+    test(S("ectnhskflp"), "", 5, 0, S::npos);
+    test(S("fgtianblpq"), "pijag", 5, 0, S::npos);
+    test(S("mfeqklirnh"), "jrckd", 5, 1, S::npos);
+    test(S("astedncjhk"), "qcloh", 5, 2, 6);
+    test(S("fhlqgcajbr"), "thlmp", 5, 4, S::npos);
+    test(S("epfhocmdng"), "qidmo", 5, 5, 6);
+    test(S("apcnsibger"), "lnegpsjqrd", 5, 0, S::npos);
+    test(S("aqkocrbign"), "rjqdablmfs", 5, 1, 5);
+    test(S("ijsmdtqgce"), "enkgpbsjaq", 5, 5, 7);
+    test(S("clobgsrken"), "kdsgoaijfh", 5, 9, 5);
+    test(S("jbhcfposld"), "trfqgmckbe", 5, 10, S::npos);
+    test(S("oqnpblhide"), "igetsracjfkdnpoblhqm", 5, 0, S::npos);
+    test(S("lroeasctif"), "nqctfaogirshlekbdjpm", 5, 1, S::npos);
+    test(S("bpjlgmiedh"), "csehfgomljdqinbartkp", 5, 10, 5);
+    test(S("pamkeoidrj"), "qahoegcmplkfsjbdnitr", 5, 19, 5);
+    test(S("espogqbthk"), "dpteiajrqmsognhlfbkc", 5, 20, 5);
+    test(S("shoiedtcjb"), "", 9, 0, S::npos);
+    test(S("ebcinjgads"), "tqbnh", 9, 0, S::npos);
+    test(S("dqmregkcfl"), "akmle", 9, 1, S::npos);
+    test(S("ngcrieqajf"), "iqfkm", 9, 2, S::npos);
+    test(S("qosmilgnjb"), "tqjsr", 9, 4, S::npos);
+    test(S("ikabsjtdfl"), "jplqg", 9, 5, 9);
+    test(S("ersmicafdh"), "oilnrbcgtj", 9, 0, S::npos);
+    test(S("fdnplotmgh"), "morkglpesn", 9, 1, S::npos);
+    test(S("fdbicojerm"), "dmicerngat", 9, 5, 9);
+    test(S("mbtafndjcq"), "radgeskbtc", 9, 9, S::npos);
+    test(S("mlenkpfdtc"), "ljikprsmqo", 9, 10, S::npos);
+    test(S("ahlcifdqgs"), "trqihkcgsjamfdbolnpe", 9, 0, S::npos);
+    test(S("bgjemaltks"), "lqmthbsrekajgnofcipd", 9, 1, S::npos);
+    test(S("pdhslbqrfc"), "jtalmedribkgqsopcnfh", 9, 10, S::npos);
+    test(S("dirhtsnjkc"), "spqfoiclmtagejbndkrh", 9, 19, 9);
+    test(S("dlroktbcja"), "nmotklspigjrdhcfaebq", 9, 20, 9);
+    test(S("ncjpmaekbs"), "", 10, 0, S::npos);
+    test(S("hlbosgmrak"), "hpmsd", 10, 0, S::npos);
+    test(S("pqfhsgilen"), "qnpor", 10, 1, S::npos);
+    test(S("gqtjsbdckh"), "otdma", 10, 2, S::npos);
+    test(S("cfkqpjlegi"), "efhjg", 10, 4, S::npos);
+    test(S("beanrfodgj"), "odpte", 10, 5, S::npos);
+    test(S("adtkqpbjfi"), "bctdgfmolr", 10, 0, S::npos);
+    test(S("iomkfthagj"), "oaklidrbqg", 10, 1, S::npos);
+}
+
+template <class S>
+void test2()
+{
+    test(S("sdpcilonqj"), "dnjfsagktr", 10, 5, S::npos);
+    test(S("gtfbdkqeml"), "nejaktmiqg", 10, 9, S::npos);
+    test(S("bmeqgcdorj"), "pjqonlebsf", 10, 10, S::npos);
+    test(S("etqlcanmob"), "dshmnbtolcjepgaikfqr", 10, 0, S::npos);
+    test(S("roqmkbdtia"), "iogfhpabtjkqlrnemcds", 10, 1, S::npos);
+    test(S("kadsithljf"), "ngridfabjsecpqltkmoh", 10, 10, S::npos);
+    test(S("sgtkpbfdmh"), "athmknplcgofrqejsdib", 10, 19, S::npos);
+    test(S("qgmetnabkl"), "ldobhmqcafnjtkeisgrp", 10, 20, S::npos);
+    test(S("cqjohampgd"), "", 11, 0, S::npos);
+    test(S("hobitmpsan"), "aocjb", 11, 0, S::npos);
+    test(S("tjehkpsalm"), "jbrnk", 11, 1, S::npos);
+    test(S("ngfbojitcl"), "tqedg", 11, 2, S::npos);
+    test(S("rcfkdbhgjo"), "nqskp", 11, 4, S::npos);
+    test(S("qghptonrea"), "eaqkl", 11, 5, S::npos);
+    test(S("hnprfgqjdl"), "reaoicljqm", 11, 0, S::npos);
+    test(S("hlmgabenti"), "lsftgajqpm", 11, 1, S::npos);
+    test(S("ofcjanmrbs"), "rlpfogmits", 11, 5, S::npos);
+    test(S("jqedtkornm"), "shkncmiaqj", 11, 9, S::npos);
+    test(S("rfedlasjmg"), "fpnatrhqgs", 11, 10, S::npos);
+    test(S("talpqjsgkm"), "sjclemqhnpdbgikarfot", 11, 0, S::npos);
+    test(S("lrkcbtqpie"), "otcmedjikgsfnqbrhpla", 11, 1, S::npos);
+    test(S("cipogdskjf"), "bonsaefdqiprkhlgtjcm", 11, 10, S::npos);
+    test(S("nqedcojahi"), "egpscmahijlfnkrodqtb", 11, 19, S::npos);
+    test(S("hefnrkmctj"), "kmqbfepjthgilscrndoa", 11, 20, S::npos);
+    test(S("atqirnmekfjolhpdsgcb"), "", 0, 0, S::npos);
+    test(S("echfkmlpribjnqsaogtd"), "prboq", 0, 0, S::npos);
+    test(S("qnhiftdgcleajbpkrosm"), "fjcqh", 0, 1, 4);
+    test(S("chamfknorbedjitgslpq"), "fmosa", 0, 2, 3);
+    test(S("njhqpibfmtlkaecdrgso"), "qdbok", 0, 4, 3);
+    test(S("ebnghfsqkprmdcljoiat"), "amslg", 0, 5, 3);
+    test(S("letjomsgihfrpqbkancd"), "smpltjneqb", 0, 0, S::npos);
+    test(S("nblgoipcrqeaktshjdmf"), "flitskrnge", 0, 1, 19);
+    test(S("cehkbngtjoiflqapsmrd"), "pgqihmlbef", 0, 5, 2);
+    test(S("mignapfoklbhcqjetdrs"), "cfpdqjtgsb", 0, 9, 2);
+    test(S("ceatbhlsqjgpnokfrmdi"), "htpsiaflom", 0, 10, 2);
+    test(S("ocihkjgrdelpfnmastqb"), "kpjfiaceghsrdtlbnomq", 0, 0, S::npos);
+    test(S("noelgschdtbrjfmiqkap"), "qhtbomidljgafneksprc", 0, 1, 16);
+    test(S("dkclqfombepritjnghas"), "nhtjobkcefldimpsaqgr", 0, 10, 1);
+    test(S("miklnresdgbhqcojftap"), "prabcjfqnoeskilmtgdh", 0, 19, 0);
+    test(S("htbcigojaqmdkfrnlsep"), "dtrgmchilkasqoebfpjn", 0, 20, 0);
+    test(S("febhmqtjanokscdirpgl"), "", 1, 0, S::npos);
+    test(S("loakbsqjpcrdhftniegm"), "sqome", 1, 0, S::npos);
+    test(S("reagphsqflbitdcjmkno"), "smfte", 1, 1, 6);
+    test(S("jitlfrqemsdhkopncabg"), "ciboh", 1, 2, 1);
+    test(S("mhtaepscdnrjqgbkifol"), "haois", 1, 4, 1);
+    test(S("tocesrfmnglpbjihqadk"), "abfki", 1, 5, 6);
+    test(S("lpfmctjrhdagneskbqoi"), "frdkocntmq", 1, 0, S::npos);
+    test(S("lsmqaepkdhncirbtjfgo"), "oasbpedlnr", 1, 1, 19);
+    test(S("epoiqmtldrabnkjhcfsg"), "kltqmhgand", 1, 5, 4);
+    test(S("emgasrilpknqojhtbdcf"), "gdtfjchpmr", 1, 9, 1);
+    test(S("hnfiagdpcklrjetqbsom"), "ponmcqblet", 1, 10, 1);
+    test(S("nsdfebgajhmtricpoklq"), "sgphqdnofeiklatbcmjr", 1, 0, S::npos);
+    test(S("atjgfsdlpobmeiqhncrk"), "ljqprsmigtfoneadckbh", 1, 1, 7);
+    test(S("sitodfgnrejlahcbmqkp"), "ligeojhafnkmrcsqtbdp", 1, 10, 1);
+    test(S("fraghmbiceknltjpqosd"), "lsimqfnjarbopedkhcgt", 1, 19, 1);
+    test(S("pmafenlhqtdbkirjsogc"), "abedmfjlghniorcqptks", 1, 20, 1);
+    test(S("pihgmoeqtnakrjslcbfd"), "", 10, 0, S::npos);
+    test(S("gjdkeprctqblnhiafsom"), "hqtoa", 10, 0, S::npos);
+    test(S("mkpnblfdsahrcqijteog"), "cahif", 10, 1, 12);
+    test(S("gckarqnelodfjhmbptis"), "kehis", 10, 2, S::npos);
+    test(S("gqpskidtbclomahnrjfe"), "kdlmh", 10, 4, 10);
+    test(S("pkldjsqrfgitbhmaecno"), "paeql", 10, 5, 15);
+    test(S("aftsijrbeklnmcdqhgop"), "aghoqiefnb", 10, 0, S::npos);
+    test(S("mtlgdrhafjkbiepqnsoc"), "jrbqaikpdo", 10, 1, S::npos);
+    test(S("pqgirnaefthokdmbsclj"), "smjonaeqcl", 10, 5, 11);
+    test(S("kpdbgjmtherlsfcqoina"), "eqbdrkcfah", 10, 9, 10);
+    test(S("jrlbothiknqmdgcfasep"), "kapmsienhf", 10, 10, 11);
+    test(S("mjogldqferckabinptsh"), "jpqotrlenfcsbhkaimdg", 10, 0, S::npos);
+    test(S("apoklnefbhmgqcdrisjt"), "jlbmhnfgtcqprikeados", 10, 1, 18);
+    test(S("ifeopcnrjbhkdgatmqls"), "stgbhfmdaljnpqoicker", 10, 10, 10);
+    test(S("ckqhaiesmjdnrgolbtpf"), "oihcetflbjagdsrkmqpn", 10, 19, 10);
+    test(S("bnlgapfimcoterskqdjh"), "adtclebmnpjsrqfkigoh", 10, 20, 10);
+    test(S("kgdlrobpmjcthqsafeni"), "", 19, 0, S::npos);
+    test(S("dfkechomjapgnslbtqir"), "beafg", 19, 0, S::npos);
+    test(S("rloadknfbqtgmhcsipje"), "iclat", 19, 1, S::npos);
+    test(S("mgjhkolrnadqbpetcifs"), "rkhnf", 19, 2, S::npos);
+    test(S("cmlfakiojdrgtbsphqen"), "clshq", 19, 4, S::npos);
+    test(S("kghbfipeomsntdalrqjc"), "dtcoj", 19, 5, 19);
+    test(S("eldiqckrnmtasbghjfpo"), "rqosnjmfth", 19, 0, S::npos);
+    test(S("abqjcfedgotihlnspkrm"), "siatdfqglh", 19, 1, S::npos);
+    test(S("qfbadrtjsimkolcenhpg"), "mrlshtpgjq", 19, 5, S::npos);
+    test(S("abseghclkjqifmtodrnp"), "adlcskgqjt", 19, 9, S::npos);
+    test(S("ibmsnlrjefhtdokacqpg"), "drshcjknaf", 19, 10, S::npos);
+    test(S("mrkfciqjebaponsthldg"), "etsaqroinghpkjdlfcbm", 19, 0, S::npos);
+    test(S("mjkticdeoqshpalrfbgn"), "sgepdnkqliambtrocfhj", 19, 1, S::npos);
+    test(S("rqnoclbdejgiphtfsakm"), "nlmcjaqgbsortfdihkpe", 19, 10, 19);
+    test(S("plkqbhmtfaeodjcrsing"), "racfnpmosldibqkghjet", 19, 19, 19);
+    test(S("oegalhmstjrfickpbndq"), "fjhdsctkqeiolagrnmbp", 19, 20, 19);
+    test(S("rdtgjcaohpblniekmsfq"), "", 20, 0, S::npos);
+    test(S("ofkqbnjetrmsaidphglc"), "ejanp", 20, 0, S::npos);
+    test(S("grkpahljcftesdmonqib"), "odife", 20, 1, S::npos);
+    test(S("jimlgbhfqkteospardcn"), "okaqd", 20, 2, S::npos);
+    test(S("gftenihpmslrjkqadcob"), "lcdbi", 20, 4, S::npos);
+    test(S("bmhldogtckrfsanijepq"), "fsqbj", 20, 5, S::npos);
+    test(S("nfqkrpjdesabgtlcmoih"), "bigdomnplq", 20, 0, S::npos);
+    test(S("focalnrpiqmdkstehbjg"), "apiblotgcd", 20, 1, S::npos);
+    test(S("rhqdspkmebiflcotnjga"), "acfhdenops", 20, 5, S::npos);
+    test(S("rahdtmsckfboqlpniegj"), "jopdeamcrk", 20, 9, S::npos);
+    test(S("fbkeiopclstmdqranjhg"), "trqncbkgmh", 20, 10, S::npos);
+    test(S("lifhpdgmbconstjeqark"), "tomglrkencbsfjqpihda", 20, 0, S::npos);
+}
+
+template <class S>
+void test3()
+{
+    test(S("pboqganrhedjmltsicfk"), "gbkhdnpoietfcmrslajq", 20, 1, S::npos);
+    test(S("klchabsimetjnqgorfpd"), "rtfnmbsglkjaichoqedp", 20, 10, S::npos);
+    test(S("sirfgmjqhctndbklaepo"), "ohkmdpfqbsacrtjnlgei", 20, 19, S::npos);
+    test(S("rlbdsiceaonqjtfpghkm"), "dlbrteoisgphmkncajfq", 20, 20, S::npos);
+    test(S("ecgdanriptblhjfqskom"), "", 21, 0, S::npos);
+    test(S("fdmiarlpgcskbhoteqjn"), "sjrlo", 21, 0, S::npos);
+    test(S("rlbstjqopignecmfadkh"), "qjpor", 21, 1, S::npos);
+    test(S("grjpqmbshektdolcafni"), "odhfn", 21, 2, S::npos);
+    test(S("sakfcohtqnibprjmlged"), "qtfin", 21, 4, S::npos);
+    test(S("mjtdglasihqpocebrfkn"), "hpqfo", 21, 5, S::npos);
+    test(S("okaplfrntghqbmeicsdj"), "fabmertkos", 21, 0, S::npos);
+    test(S("sahngemrtcjidqbklfpo"), "brqtgkmaej", 21, 1, S::npos);
+    test(S("dlmsipcnekhbgoaftqjr"), "nfrdeihsgl", 21, 5, S::npos);
+    test(S("ahegrmqnoiklpfsdbcjt"), "hlfrosekpi", 21, 9, S::npos);
+    test(S("hdsjbnmlegtkqripacof"), "atgbkrjdsm", 21, 10, S::npos);
+    test(S("pcnedrfjihqbalkgtoms"), "blnrptjgqmaifsdkhoec", 21, 0, S::npos);
+    test(S("qjidealmtpskrbfhocng"), "ctpmdahebfqjgknloris", 21, 1, S::npos);
+    test(S("qeindtagmokpfhsclrbj"), "apnkeqthrmlbfodiscgj", 21, 10, S::npos);
+    test(S("kpfegbjhsrnodltqciam"), "jdgictpframeoqlsbknh", 21, 19, S::npos);
+    test(S("hnbrcplsjfgiktoedmaq"), "qprlsfojamgndekthibc", 21, 20, S::npos);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test0<S>();
+    test1<S>();
+    test2<S>();
+    test3<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_first_of( "",      0, 0) == SV::npos, "" );
+    static_assert (sv1.find_first_of( "irkhs", 0, 5) == SV::npos, "" );
+    static_assert (sv2.find_first_of( "",      0, 0) == SV::npos, "" );
+    static_assert (sv2.find_first_of( "gfsrt", 0, 5) == SV::npos, "" );
+    static_assert (sv2.find_first_of( "lecar", 0, 5) == 0, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.find/find_first_of_string_view_size.pass.cpp

@@ -0,0 +1,148 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// size_type find_first_of(const basic_string_view& str, size_type pos = 0) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type pos, typename S::size_type x)
+{
+    assert(s.find_first_of(str, pos) == x);
+    if (x != S::npos)
+        assert(pos <= x && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type x)
+{
+    assert(s.find_first_of(str) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), S(""), 0, S::npos);
+    test(S(""), S("laenf"), 0, S::npos);
+    test(S(""), S("pqlnkmbdjo"), 0, S::npos);
+    test(S(""), S("qkamfogpnljdcshbreti"), 0, S::npos);
+    test(S(""), S(""), 1, S::npos);
+    test(S(""), S("bjaht"), 1, S::npos);
+    test(S(""), S("hjlcmgpket"), 1, S::npos);
+    test(S(""), S("htaobedqikfplcgjsmrn"), 1, S::npos);
+    test(S("fodgq"), S(""), 0, S::npos);
+    test(S("qanej"), S("dfkap"), 0, 1);
+    test(S("clbao"), S("ihqrfebgad"), 0, 2);
+    test(S("mekdn"), S("ngtjfcalbseiqrphmkdo"), 0, 0);
+    test(S("srdfq"), S(""), 1, S::npos);
+    test(S("oemth"), S("ikcrq"), 1, S::npos);
+    test(S("cdaih"), S("dmajblfhsg"), 1, 1);
+    test(S("qohtk"), S("oqftjhdmkgsblacenirp"), 1, 1);
+    test(S("cshmd"), S(""), 2, S::npos);
+    test(S("lhcdo"), S("oebqi"), 2, 4);
+    test(S("qnsoh"), S("kojhpmbsfe"), 2, 2);
+    test(S("pkrof"), S("acbsjqogpltdkhinfrem"), 2, 2);
+    test(S("fmtsp"), S(""), 4, S::npos);
+    test(S("khbpm"), S("aobjd"), 4, S::npos);
+    test(S("pbsji"), S("pcbahntsje"), 4, S::npos);
+    test(S("mprdj"), S("fhepcrntkoagbmldqijs"), 4, 4);
+    test(S("eqmpa"), S(""), 5, S::npos);
+    test(S("omigs"), S("kocgb"), 5, S::npos);
+    test(S("onmje"), S("fbslrjiqkm"), 5, S::npos);
+    test(S("oqmrj"), S("jeidpcmalhfnqbgtrsko"), 5, S::npos);
+    test(S("schfa"), S(""), 6, S::npos);
+    test(S("igdsc"), S("qngpd"), 6, S::npos);
+    test(S("brqgo"), S("rodhqklgmb"), 6, S::npos);
+    test(S("tnrph"), S("thdjgafrlbkoiqcspmne"), 6, S::npos);
+    test(S("hcjitbfapl"), S(""), 0, S::npos);
+    test(S("daiprenocl"), S("ashjd"), 0, 0);
+    test(S("litpcfdghe"), S("mgojkldsqh"), 0, 0);
+    test(S("aidjksrolc"), S("imqnaghkfrdtlopbjesc"), 0, 0);
+    test(S("qpghtfbaji"), S(""), 1, S::npos);
+    test(S("gfshlcmdjr"), S("nadkh"), 1, 3);
+    test(S("nkodajteqp"), S("ofdrqmkebl"), 1, 1);
+    test(S("gbmetiprqd"), S("bdfjqgatlksriohemnpc"), 1, 1);
+    test(S("crnklpmegd"), S(""), 5, S::npos);
+    test(S("jsbtafedoc"), S("prqgn"), 5, S::npos);
+    test(S("qnmodrtkeb"), S("pejafmnokr"), 5, 5);
+    test(S("cpebqsfmnj"), S("odnqkgijrhabfmcestlp"), 5, 5);
+    test(S("lmofqdhpki"), S(""), 9, S::npos);
+    test(S("hnefkqimca"), S("rtjpa"), 9, 9);
+    test(S("drtasbgmfp"), S("ktsrmnqagd"), 9, S::npos);
+    test(S("lsaijeqhtr"), S("rtdhgcisbnmoaqkfpjle"), 9, 9);
+    test(S("elgofjmbrq"), S(""), 10, S::npos);
+    test(S("mjqdgalkpc"), S("dplqa"), 10, S::npos);
+    test(S("kthqnfcerm"), S("dkacjoptns"), 10, S::npos);
+    test(S("dfsjhanorc"), S("hqfimtrgnbekpdcsjalo"), 10, S::npos);
+    test(S("eqsgalomhb"), S(""), 11, S::npos);
+    test(S("akiteljmoh"), S("lofbc"), 11, S::npos);
+    test(S("hlbdfreqjo"), S("astoegbfpn"), 11, S::npos);
+    test(S("taqobhlerg"), S("pdgreqomsncafklhtibj"), 11, S::npos);
+    test(S("snafbdlghrjkpqtoceim"), S(""), 0, S::npos);
+    test(S("aemtbrgcklhndjisfpoq"), S("lbtqd"), 0, 3);
+    test(S("pnracgfkjdiholtbqsem"), S("tboimldpjh"), 0, 0);
+    test(S("dicfltehbsgrmojnpkaq"), S("slcerthdaiqjfnobgkpm"), 0, 0);
+    test(S("jlnkraeodhcspfgbqitm"), S(""), 1, S::npos);
+    test(S("lhosrngtmfjikbqpcade"), S("aqibs"), 1, 3);
+    test(S("rbtaqjhgkneisldpmfoc"), S("gtfblmqinc"), 1, 1);
+    test(S("gpifsqlrdkbonjtmheca"), S("mkqpbtdalgniorhfescj"), 1, 1);
+    test(S("hdpkobnsalmcfijregtq"), S(""), 10, S::npos);
+    test(S("jtlshdgqaiprkbcoenfm"), S("pblas"), 10, 10);
+    test(S("fkdrbqltsgmcoiphneaj"), S("arosdhcfme"), 10, 10);
+    test(S("crsplifgtqedjohnabmk"), S("blkhjeogicatqfnpdmsr"), 10, 10);
+    test(S("niptglfbosehkamrdqcj"), S(""), 19, S::npos);
+    test(S("copqdhstbingamjfkler"), S("djkqc"), 19, S::npos);
+    test(S("mrtaefilpdsgocnhqbjk"), S("lgokshjtpb"), 19, 19);
+    test(S("kojatdhlcmigpbfrqnes"), S("bqjhtkfepimcnsgrlado"), 19, 19);
+    test(S("eaintpchlqsbdgrkjofm"), S(""), 20, S::npos);
+    test(S("gjnhidfsepkrtaqbmclo"), S("nocfa"), 20, S::npos);
+    test(S("spocfaktqdbiejlhngmr"), S("bgtajmiedc"), 20, S::npos);
+    test(S("rphmlekgfscndtaobiqj"), S("lsckfnqgdahejiopbtmr"), 20, S::npos);
+    test(S("liatsqdoegkmfcnbhrpj"), S(""), 21, S::npos);
+    test(S("binjagtfldkrspcomqeh"), S("gfsrt"), 21, S::npos);
+    test(S("latkmisecnorjbfhqpdg"), S("pfsocbhjtm"), 21, S::npos);
+    test(S("lecfratdjkhnsmqpoigb"), S("tpflmdnoicjgkberhqsa"), 21, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), S(""), S::npos);
+    test(S(""), S("laenf"), S::npos);
+    test(S(""), S("pqlnkmbdjo"), S::npos);
+    test(S(""), S("qkamfogpnljdcshbreti"), S::npos);
+    test(S("nhmko"), S(""), S::npos);
+    test(S("lahfb"), S("irkhs"), 2);
+    test(S("gmfhd"), S("kantesmpgj"), 0);
+    test(S("odaft"), S("oknlrstdpiqmjbaghcfe"), 0);
+    test(S("eolhfgpjqk"), S(""), S::npos);
+    test(S("nbatdlmekr"), S("bnrpe"), 0);
+    test(S("jdmciepkaq"), S("jtdaefblso"), 0);
+    test(S("hkbgspoflt"), S("oselktgbcapndfjihrmq"), 0);
+    test(S("gprdcokbnjhlsfmtieqa"), S(""), S::npos);
+    test(S("qjghlnftcaismkropdeb"), S("bjaht"), 1);
+    test(S("pnalfrdtkqcmojiesbhg"), S("hjlcmgpket"), 0);
+    test(S("pniotcfrhqsmgdkjbael"), S("htaobedqikfplcgjsmrn"), 0);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+}

test/experimental/string.view/string.view.find/find_last_not_of_char_size.pass.cpp

@@ -0,0 +1,82 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// const size_type find_last_not_of(charT c, size_type pos = npos) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.find_last_not_of(c, pos) == x);
+    if (x != S::npos)
+        assert(x <= pos && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type x)
+{
+    assert(s.find_last_not_of(c) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test(S(""), 'i', 0, S::npos);
+    test(S(""), 'i', 1, S::npos);
+    test(S("kitcj"), 'i', 0, 0);
+    test(S("qkamf"), 'i', 1, 1);
+    test(S("nhmko"), 'i', 2, 2);
+    test(S("tpsaf"), 'i', 4, 4);
+    test(S("lahfb"), 'i', 5, 4);
+    test(S("irkhs"), 'i', 6, 4);
+    test(S("gmfhdaipsr"), 'i', 0, 0);
+    test(S("kantesmpgj"), 'i', 1, 1);
+    test(S("odaftiegpm"), 'i', 5, 4);
+    test(S("oknlrstdpi"), 'i', 9, 8);
+    test(S("eolhfgpjqk"), 'i', 10, 9);
+    test(S("pcdrofikas"), 'i', 11, 9);
+    test(S("nbatdlmekrgcfqsophij"), 'i', 0, 0);
+    test(S("bnrpehidofmqtcksjgla"), 'i', 1, 1);
+    test(S("jdmciepkaqgotsrfnhlb"), 'i', 10, 10);
+    test(S("jtdaefblsokrmhpgcnqi"), 'i', 19, 18);
+    test(S("hkbgspofltajcnedqmri"), 'i', 20, 18);
+    test(S("oselktgbcapndfjihrmq"), 'i', 21, 19);
+
+    test(S(""), 'i', S::npos);
+    test(S("csope"), 'i', 4);
+    test(S("gfsmthlkon"), 'i', 9);
+    test(S("laenfsbridchgotmkqpj"), 'i', 19);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_last_not_of( 'i', 0 ) == SV::npos, "" );
+    static_assert (sv1.find_last_not_of( 'i', 1 ) == SV::npos, "" );
+    static_assert (sv2.find_last_not_of( 'a', 0 ) == SV::npos, "" );
+    static_assert (sv2.find_last_not_of( 'a', 1 ) == 1, "" );
+    static_assert (sv2.find_last_not_of( 'e', 5 ) == 3, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.find/find_last_not_of_pointer_size.pass.cpp

@@ -0,0 +1,165 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type find_last_not_of(const charT* s, size_type pos = npos) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.find_last_not_of(str, pos) == x);
+    if (x != S::npos)
+        assert(x <= pos && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type x)
+{
+    assert(s.find_last_not_of(str) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, S::npos);
+    test(S(""), "laenf", 0, S::npos);
+    test(S(""), "pqlnkmbdjo", 0, S::npos);
+    test(S(""), "qkamfogpnljdcshbreti", 0, S::npos);
+    test(S(""), "", 1, S::npos);
+    test(S(""), "bjaht", 1, S::npos);
+    test(S(""), "hjlcmgpket", 1, S::npos);
+    test(S(""), "htaobedqikfplcgjsmrn", 1, S::npos);
+    test(S("fodgq"), "", 0, 0);
+    test(S("qanej"), "dfkap", 0, 0);
+    test(S("clbao"), "ihqrfebgad", 0, 0);
+    test(S("mekdn"), "ngtjfcalbseiqrphmkdo", 0, S::npos);
+    test(S("srdfq"), "", 1, 1);
+    test(S("oemth"), "ikcrq", 1, 1);
+    test(S("cdaih"), "dmajblfhsg", 1, 0);
+    test(S("qohtk"), "oqftjhdmkgsblacenirp", 1, S::npos);
+    test(S("cshmd"), "", 2, 2);
+    test(S("lhcdo"), "oebqi", 2, 2);
+    test(S("qnsoh"), "kojhpmbsfe", 2, 1);
+    test(S("pkrof"), "acbsjqogpltdkhinfrem", 2, S::npos);
+    test(S("fmtsp"), "", 4, 4);
+    test(S("khbpm"), "aobjd", 4, 4);
+    test(S("pbsji"), "pcbahntsje", 4, 4);
+    test(S("mprdj"), "fhepcrntkoagbmldqijs", 4, S::npos);
+    test(S("eqmpa"), "", 5, 4);
+    test(S("omigs"), "kocgb", 5, 4);
+    test(S("onmje"), "fbslrjiqkm", 5, 4);
+    test(S("oqmrj"), "jeidpcmalhfnqbgtrsko", 5, S::npos);
+    test(S("schfa"), "", 6, 4);
+    test(S("igdsc"), "qngpd", 6, 4);
+    test(S("brqgo"), "rodhqklgmb", 6, S::npos);
+    test(S("tnrph"), "thdjgafrlbkoiqcspmne", 6, S::npos);
+    test(S("hcjitbfapl"), "", 0, 0);
+    test(S("daiprenocl"), "ashjd", 0, S::npos);
+    test(S("litpcfdghe"), "mgojkldsqh", 0, S::npos);
+    test(S("aidjksrolc"), "imqnaghkfrdtlopbjesc", 0, S::npos);
+    test(S("qpghtfbaji"), "", 1, 1);
+    test(S("gfshlcmdjr"), "nadkh", 1, 1);
+    test(S("nkodajteqp"), "ofdrqmkebl", 1, 0);
+    test(S("gbmetiprqd"), "bdfjqgatlksriohemnpc", 1, S::npos);
+    test(S("crnklpmegd"), "", 5, 5);
+    test(S("jsbtafedoc"), "prqgn", 5, 5);
+    test(S("qnmodrtkeb"), "pejafmnokr", 5, 4);
+    test(S("cpebqsfmnj"), "odnqkgijrhabfmcestlp", 5, S::npos);
+    test(S("lmofqdhpki"), "", 9, 9);
+    test(S("hnefkqimca"), "rtjpa", 9, 8);
+    test(S("drtasbgmfp"), "ktsrmnqagd", 9, 9);
+    test(S("lsaijeqhtr"), "rtdhgcisbnmoaqkfpjle", 9, S::npos);
+    test(S("elgofjmbrq"), "", 10, 9);
+    test(S("mjqdgalkpc"), "dplqa", 10, 9);
+    test(S("kthqnfcerm"), "dkacjoptns", 10, 9);
+    test(S("dfsjhanorc"), "hqfimtrgnbekpdcsjalo", 10, S::npos);
+    test(S("eqsgalomhb"), "", 11, 9);
+    test(S("akiteljmoh"), "lofbc", 11, 9);
+    test(S("hlbdfreqjo"), "astoegbfpn", 11, 8);
+    test(S("taqobhlerg"), "pdgreqomsncafklhtibj", 11, S::npos);
+    test(S("snafbdlghrjkpqtoceim"), "", 0, 0);
+    test(S("aemtbrgcklhndjisfpoq"), "lbtqd", 0, 0);
+    test(S("pnracgfkjdiholtbqsem"), "tboimldpjh", 0, S::npos);
+    test(S("dicfltehbsgrmojnpkaq"), "slcerthdaiqjfnobgkpm", 0, S::npos);
+    test(S("jlnkraeodhcspfgbqitm"), "", 1, 1);
+    test(S("lhosrngtmfjikbqpcade"), "aqibs", 1, 1);
+    test(S("rbtaqjhgkneisldpmfoc"), "gtfblmqinc", 1, 0);
+    test(S("gpifsqlrdkbonjtmheca"), "mkqpbtdalgniorhfescj", 1, S::npos);
+    test(S("hdpkobnsalmcfijregtq"), "", 10, 10);
+    test(S("jtlshdgqaiprkbcoenfm"), "pblas", 10, 9);
+    test(S("fkdrbqltsgmcoiphneaj"), "arosdhcfme", 10, 9);
+    test(S("crsplifgtqedjohnabmk"), "blkhjeogicatqfnpdmsr", 10, S::npos);
+    test(S("niptglfbosehkamrdqcj"), "", 19, 19);
+    test(S("copqdhstbingamjfkler"), "djkqc", 19, 19);
+    test(S("mrtaefilpdsgocnhqbjk"), "lgokshjtpb", 19, 16);
+    test(S("kojatdhlcmigpbfrqnes"), "bqjhtkfepimcnsgrlado", 19, S::npos);
+    test(S("eaintpchlqsbdgrkjofm"), "", 20, 19);
+    test(S("gjnhidfsepkrtaqbmclo"), "nocfa", 20, 18);
+    test(S("spocfaktqdbiejlhngmr"), "bgtajmiedc", 20, 19);
+    test(S("rphmlekgfscndtaobiqj"), "lsckfnqgdahejiopbtmr", 20, S::npos);
+    test(S("liatsqdoegkmfcnbhrpj"), "", 21, 19);
+    test(S("binjagtfldkrspcomqeh"), "gfsrt", 21, 19);
+    test(S("latkmisecnorjbfhqpdg"), "pfsocbhjtm", 21, 19);
+    test(S("lecfratdjkhnsmqpoigb"), "tpflmdnoicjgkberhqsa", 21, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), "", S::npos);
+    test(S(""), "laenf", S::npos);
+    test(S(""), "pqlnkmbdjo", S::npos);
+    test(S(""), "qkamfogpnljdcshbreti", S::npos);
+    test(S("nhmko"), "", 4);
+    test(S("lahfb"), "irkhs", 4);
+    test(S("gmfhd"), "kantesmpgj", 4);
+    test(S("odaft"), "oknlrstdpiqmjbaghcfe", S::npos);
+    test(S("eolhfgpjqk"), "", 9);
+    test(S("nbatdlmekr"), "bnrpe", 8);
+    test(S("jdmciepkaq"), "jtdaefblso", 9);
+    test(S("hkbgspoflt"), "oselktgbcapndfjihrmq", S::npos);
+    test(S("gprdcokbnjhlsfmtieqa"), "", 19);
+    test(S("qjghlnftcaismkropdeb"), "bjaht", 18);
+    test(S("pnalfrdtkqcmojiesbhg"), "hjlcmgpket", 17);
+    test(S("pniotcfrhqsmgdkjbael"), "htaobedqikfplcgjsmrn", S::npos);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_last_not_of( "",      0) == SV::npos, "" );
+    static_assert (sv1.find_last_not_of( "irkhs", 5) == SV::npos, "" );
+    static_assert (sv2.find_last_not_of( "",      0) == 0, "" );
+    static_assert (sv2.find_last_not_of( "gfsrt", 5) == 4, "" );
+    static_assert (sv2.find_last_not_of( "lecar", 5) == 3, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.find/find_last_not_of_pointer_size_size.pass.cpp

@@ -0,0 +1,392 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// constexpr size_type find_last_not_of(const charT* s, size_type pos, size_type n) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type n, typename S::size_type x)
+{
+    assert(s.find_last_not_of(str, pos, n) == x);
+    if (x != S::npos)
+        assert(x <= pos && x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, 0, S::npos);
+    test(S(""), "irkhs", 0, 0, S::npos);
+    test(S(""), "kante", 0, 1, S::npos);
+    test(S(""), "oknlr", 0, 2, S::npos);
+    test(S(""), "pcdro", 0, 4, S::npos);
+    test(S(""), "bnrpe", 0, 5, S::npos);
+    test(S(""), "jtdaefblso", 0, 0, S::npos);
+    test(S(""), "oselktgbca", 0, 1, S::npos);
+    test(S(""), "eqgaplhckj", 0, 5, S::npos);
+    test(S(""), "bjahtcmnlp", 0, 9, S::npos);
+    test(S(""), "hjlcmgpket", 0, 10, S::npos);
+    test(S(""), "htaobedqikfplcgjsmrn", 0, 0, S::npos);
+    test(S(""), "hpqiarojkcdlsgnmfetb", 0, 1, S::npos);
+    test(S(""), "dfkaprhjloqetcsimnbg", 0, 10, S::npos);
+    test(S(""), "ihqrfebgadntlpmjksoc", 0, 19, S::npos);
+    test(S(""), "ngtjfcalbseiqrphmkdo", 0, 20, S::npos);
+    test(S(""), "", 1, 0, S::npos);
+    test(S(""), "lbtqd", 1, 0, S::npos);
+    test(S(""), "tboim", 1, 1, S::npos);
+    test(S(""), "slcer", 1, 2, S::npos);
+    test(S(""), "cbjfs", 1, 4, S::npos);
+    test(S(""), "aqibs", 1, 5, S::npos);
+    test(S(""), "gtfblmqinc", 1, 0, S::npos);
+    test(S(""), "mkqpbtdalg", 1, 1, S::npos);
+    test(S(""), "kphatlimcd", 1, 5, S::npos);
+    test(S(""), "pblasqogic", 1, 9, S::npos);
+    test(S(""), "arosdhcfme", 1, 10, S::npos);
+    test(S(""), "blkhjeogicatqfnpdmsr", 1, 0, S::npos);
+    test(S(""), "bmhineprjcoadgstflqk", 1, 1, S::npos);
+    test(S(""), "djkqcmetslnghpbarfoi", 1, 10, S::npos);
+    test(S(""), "lgokshjtpbemarcdqnfi", 1, 19, S::npos);
+    test(S(""), "bqjhtkfepimcnsgrlado", 1, 20, S::npos);
+    test(S("eaint"), "", 0, 0, 0);
+    test(S("binja"), "gfsrt", 0, 0, 0);
+    test(S("latkm"), "pfsoc", 0, 1, 0);
+    test(S("lecfr"), "tpflm", 0, 2, 0);
+    test(S("eqkst"), "sgkec", 0, 4, S::npos);
+    test(S("cdafr"), "romds", 0, 5, 0);
+    test(S("prbhe"), "qhjistlgmr", 0, 0, 0);
+    test(S("lbisk"), "pedfirsglo", 0, 1, 0);
+    test(S("hrlpd"), "aqcoslgrmk", 0, 5, 0);
+    test(S("ehmja"), "dabckmepqj", 0, 9, S::npos);
+    test(S("mhqgd"), "pqscrjthli", 0, 10, 0);
+    test(S("tgklq"), "kfphdcsjqmobliagtren", 0, 0, 0);
+    test(S("bocjs"), "rokpefncljibsdhqtagm", 0, 1, 0);
+    test(S("grbsd"), "afionmkphlebtcjqsgrd", 0, 10, 0);
+    test(S("ofjqr"), "aenmqplidhkofrjbctsg", 0, 19, S::npos);
+    test(S("btlfi"), "osjmbtcadhiklegrpqnf", 0, 20, S::npos);
+    test(S("clrgb"), "", 1, 0, 1);
+    test(S("tjmek"), "osmia", 1, 0, 1);
+    test(S("bgstp"), "ckonl", 1, 1, 1);
+    test(S("hstrk"), "ilcaj", 1, 2, 1);
+    test(S("kmspj"), "lasiq", 1, 4, 1);
+    test(S("tjboh"), "kfqmr", 1, 5, 1);
+    test(S("ilbcj"), "klnitfaobg", 1, 0, 1);
+    test(S("jkngf"), "gjhmdlqikp", 1, 1, 1);
+    test(S("gfcql"), "skbgtahqej", 1, 5, 1);
+    test(S("dqtlg"), "bjsdgtlpkf", 1, 9, 1);
+    test(S("bthpg"), "bjgfmnlkio", 1, 10, 1);
+    test(S("dgsnq"), "lbhepotfsjdqigcnamkr", 1, 0, 1);
+    test(S("rmfhp"), "tebangckmpsrqdlfojhi", 1, 1, 1);
+    test(S("jfdam"), "joflqbdkhtegimscpanr", 1, 10, S::npos);
+    test(S("edapb"), "adpmcohetfbsrjinlqkg", 1, 19, S::npos);
+    test(S("brfsm"), "iacldqjpfnogbsrhmetk", 1, 20, S::npos);
+    test(S("ndrhl"), "", 2, 0, 2);
+    test(S("mrecp"), "otkgb", 2, 0, 2);
+    test(S("qlasf"), "cqsjl", 2, 1, 2);
+    test(S("smaqd"), "dpifl", 2, 2, 2);
+    test(S("hjeni"), "oapht", 2, 4, 2);
+    test(S("ocmfj"), "cifts", 2, 5, 2);
+    test(S("hmftq"), "nmsckbgalo", 2, 0, 2);
+    test(S("fklad"), "tpksqhamle", 2, 1, 2);
+    test(S("dirnm"), "tpdrchmkji", 2, 5, 1);
+    test(S("hrgdc"), "ijagfkblst", 2, 9, 1);
+    test(S("ifakg"), "kpocsignjb", 2, 10, 2);
+    test(S("ebrgd"), "pecqtkjsnbdrialgmohf", 2, 0, 2);
+    test(S("rcjml"), "aiortphfcmkjebgsndql", 2, 1, 2);
+    test(S("peqmt"), "sdbkeamglhipojqftrcn", 2, 10, 2);
+    test(S("frehn"), "ljqncehgmfktroapidbs", 2, 19, S::npos);
+    test(S("tqolf"), "rtcfodilamkbenjghqps", 2, 20, S::npos);
+    test(S("cjgao"), "", 4, 0, 4);
+    test(S("kjplq"), "mabns", 4, 0, 4);
+    test(S("herni"), "bdnrp", 4, 1, 4);
+    test(S("tadrb"), "scidp", 4, 2, 4);
+    test(S("pkfeo"), "agbjl", 4, 4, 4);
+    test(S("hoser"), "jfmpr", 4, 5, 3);
+    test(S("kgrsp"), "rbpefghsmj", 4, 0, 4);
+    test(S("pgejb"), "apsfntdoqc", 4, 1, 4);
+    test(S("thlnq"), "ndkjeisgcl", 4, 5, 4);
+    test(S("nbmit"), "rnfpqatdeo", 4, 9, 3);
+    test(S("jgmib"), "bntjlqrfik", 4, 10, 2);
+    test(S("ncrfj"), "kcrtmpolnaqejghsfdbi", 4, 0, 4);
+    test(S("ncsik"), "lobheanpkmqidsrtcfgj", 4, 1, 4);
+    test(S("sgbfh"), "athdkljcnreqbgpmisof", 4, 10, 3);
+    test(S("dktbn"), "qkdmjialrscpbhefgont", 4, 19, 2);
+    test(S("fthqm"), "dmasojntqleribkgfchp", 4, 20, S::npos);
+    test(S("klopi"), "", 5, 0, 4);
+    test(S("dajhn"), "psthd", 5, 0, 4);
+    test(S("jbgno"), "rpmjd", 5, 1, 4);
+    test(S("hkjae"), "dfsmk", 5, 2, 4);
+}
+
+template <class S>
+void test1()
+{
+    test(S("gbhqo"), "skqne", 5, 4, 4);
+    test(S("ktdor"), "kipnf", 5, 5, 4);
+    test(S("ldprn"), "hmrnqdgifl", 5, 0, 4);
+    test(S("egmjk"), "fsmjcdairn", 5, 1, 4);
+    test(S("armql"), "pcdgltbrfj", 5, 5, 3);
+    test(S("cdhjo"), "aekfctpirg", 5, 9, 4);
+    test(S("jcons"), "ledihrsgpf", 5, 10, 3);
+    test(S("cbrkp"), "mqcklahsbtirgopefndj", 5, 0, 4);
+    test(S("fhgna"), "kmlthaoqgecrnpdbjfis", 5, 1, 4);
+    test(S("ejfcd"), "sfhbamcdptojlkrenqgi", 5, 10, 1);
+    test(S("kqjhe"), "pbniofmcedrkhlstgaqj", 5, 19, 2);
+    test(S("pbdjl"), "mongjratcskbhqiepfdl", 5, 20, S::npos);
+    test(S("gajqn"), "", 6, 0, 4);
+    test(S("stedk"), "hrnat", 6, 0, 4);
+    test(S("tjkaf"), "gsqdt", 6, 1, 4);
+    test(S("dthpe"), "bspkd", 6, 2, 4);
+    test(S("klhde"), "ohcmb", 6, 4, 4);
+    test(S("bhlki"), "heatr", 6, 5, 4);
+    test(S("lqmoh"), "pmblckedfn", 6, 0, 4);
+    test(S("mtqin"), "aceqmsrbik", 6, 1, 4);
+    test(S("dpqbr"), "lmbtdehjrn", 6, 5, 4);
+    test(S("kdhmo"), "teqmcrlgib", 6, 9, 4);
+    test(S("jblqp"), "njolbmspac", 6, 10, 3);
+    test(S("qmjgl"), "pofnhidklamecrbqjgst", 6, 0, 4);
+    test(S("rothp"), "jbhckmtgrqnosafedpli", 6, 1, 4);
+    test(S("ghknq"), "dobntpmqklicsahgjerf", 6, 10, 1);
+    test(S("eopfi"), "tpdshainjkbfoemlrgcq", 6, 19, S::npos);
+    test(S("dsnmg"), "oldpfgeakrnitscbjmqh", 6, 20, S::npos);
+    test(S("jnkrfhotgl"), "", 0, 0, 0);
+    test(S("dltjfngbko"), "rqegt", 0, 0, 0);
+    test(S("bmjlpkiqde"), "dashm", 0, 1, 0);
+    test(S("skrflobnqm"), "jqirk", 0, 2, 0);
+    test(S("jkpldtshrm"), "rckeg", 0, 4, 0);
+    test(S("ghasdbnjqo"), "jscie", 0, 5, 0);
+    test(S("igrkhpbqjt"), "efsphndliq", 0, 0, 0);
+    test(S("ikthdgcamf"), "gdicosleja", 0, 1, 0);
+    test(S("pcofgeniam"), "qcpjibosfl", 0, 5, S::npos);
+    test(S("rlfjgesqhc"), "lrhmefnjcq", 0, 9, S::npos);
+    test(S("itphbqsker"), "dtablcrseo", 0, 10, 0);
+    test(S("skjafcirqm"), "apckjsftedbhgomrnilq", 0, 0, 0);
+    test(S("tcqomarsfd"), "pcbrgflehjtiadnsokqm", 0, 1, 0);
+    test(S("rocfeldqpk"), "nsiadegjklhobrmtqcpf", 0, 10, 0);
+    test(S("cfpegndlkt"), "cpmajdqnolikhgsbretf", 0, 19, S::npos);
+    test(S("fqbtnkeasj"), "jcflkntmgiqrphdosaeb", 0, 20, S::npos);
+    test(S("shbcqnmoar"), "", 1, 0, 1);
+    test(S("bdoshlmfin"), "ontrs", 1, 0, 1);
+    test(S("khfrebnsgq"), "pfkna", 1, 1, 1);
+    test(S("getcrsaoji"), "ekosa", 1, 2, 0);
+    test(S("fjiknedcpq"), "anqhk", 1, 4, 1);
+    test(S("tkejgnafrm"), "jekca", 1, 5, 0);
+    test(S("jnakolqrde"), "ikemsjgacf", 1, 0, 1);
+    test(S("lcjptsmgbe"), "arolgsjkhm", 1, 1, 1);
+    test(S("itfsmcjorl"), "oftkbldhre", 1, 5, 0);
+    test(S("omchkfrjea"), "gbkqdoeftl", 1, 9, 1);
+    test(S("cigfqkated"), "sqcflrgtim", 1, 10, S::npos);
+    test(S("tscenjikml"), "fmhbkislrjdpanogqcet", 1, 0, 1);
+    test(S("qcpaemsinf"), "rnioadktqlgpbcjsmhef", 1, 1, 1);
+    test(S("gltkojeipd"), "oakgtnldpsefihqmjcbr", 1, 10, S::npos);
+    test(S("qistfrgnmp"), "gbnaelosidmcjqktfhpr", 1, 19, S::npos);
+    test(S("bdnpfcqaem"), "akbripjhlosndcmqgfet", 1, 20, S::npos);
+    test(S("ectnhskflp"), "", 5, 0, 5);
+    test(S("fgtianblpq"), "pijag", 5, 0, 5);
+    test(S("mfeqklirnh"), "jrckd", 5, 1, 5);
+    test(S("astedncjhk"), "qcloh", 5, 2, 5);
+    test(S("fhlqgcajbr"), "thlmp", 5, 4, 5);
+    test(S("epfhocmdng"), "qidmo", 5, 5, 5);
+    test(S("apcnsibger"), "lnegpsjqrd", 5, 0, 5);
+    test(S("aqkocrbign"), "rjqdablmfs", 5, 1, 4);
+    test(S("ijsmdtqgce"), "enkgpbsjaq", 5, 5, 5);
+    test(S("clobgsrken"), "kdsgoaijfh", 5, 9, 3);
+    test(S("jbhcfposld"), "trfqgmckbe", 5, 10, 5);
+    test(S("oqnpblhide"), "igetsracjfkdnpoblhqm", 5, 0, 5);
+    test(S("lroeasctif"), "nqctfaogirshlekbdjpm", 5, 1, 5);
+    test(S("bpjlgmiedh"), "csehfgomljdqinbartkp", 5, 10, 1);
+    test(S("pamkeoidrj"), "qahoegcmplkfsjbdnitr", 5, 19, S::npos);
+    test(S("espogqbthk"), "dpteiajrqmsognhlfbkc", 5, 20, S::npos);
+    test(S("shoiedtcjb"), "", 9, 0, 9);
+    test(S("ebcinjgads"), "tqbnh", 9, 0, 9);
+    test(S("dqmregkcfl"), "akmle", 9, 1, 9);
+    test(S("ngcrieqajf"), "iqfkm", 9, 2, 9);
+    test(S("qosmilgnjb"), "tqjsr", 9, 4, 9);
+    test(S("ikabsjtdfl"), "jplqg", 9, 5, 8);
+    test(S("ersmicafdh"), "oilnrbcgtj", 9, 0, 9);
+    test(S("fdnplotmgh"), "morkglpesn", 9, 1, 9);
+    test(S("fdbicojerm"), "dmicerngat", 9, 5, 8);
+    test(S("mbtafndjcq"), "radgeskbtc", 9, 9, 9);
+    test(S("mlenkpfdtc"), "ljikprsmqo", 9, 10, 9);
+    test(S("ahlcifdqgs"), "trqihkcgsjamfdbolnpe", 9, 0, 9);
+    test(S("bgjemaltks"), "lqmthbsrekajgnofcipd", 9, 1, 9);
+    test(S("pdhslbqrfc"), "jtalmedribkgqsopcnfh", 9, 10, 9);
+    test(S("dirhtsnjkc"), "spqfoiclmtagejbndkrh", 9, 19, 3);
+    test(S("dlroktbcja"), "nmotklspigjrdhcfaebq", 9, 20, S::npos);
+    test(S("ncjpmaekbs"), "", 10, 0, 9);
+    test(S("hlbosgmrak"), "hpmsd", 10, 0, 9);
+    test(S("pqfhsgilen"), "qnpor", 10, 1, 9);
+    test(S("gqtjsbdckh"), "otdma", 10, 2, 9);
+    test(S("cfkqpjlegi"), "efhjg", 10, 4, 9);
+    test(S("beanrfodgj"), "odpte", 10, 5, 9);
+    test(S("adtkqpbjfi"), "bctdgfmolr", 10, 0, 9);
+    test(S("iomkfthagj"), "oaklidrbqg", 10, 1, 9);
+}
+
+template <class S>
+void test2()
+{
+    test(S("sdpcilonqj"), "dnjfsagktr", 10, 5, 8);
+    test(S("gtfbdkqeml"), "nejaktmiqg", 10, 9, 9);
+    test(S("bmeqgcdorj"), "pjqonlebsf", 10, 10, 8);
+    test(S("etqlcanmob"), "dshmnbtolcjepgaikfqr", 10, 0, 9);
+    test(S("roqmkbdtia"), "iogfhpabtjkqlrnemcds", 10, 1, 9);
+    test(S("kadsithljf"), "ngridfabjsecpqltkmoh", 10, 10, 7);
+    test(S("sgtkpbfdmh"), "athmknplcgofrqejsdib", 10, 19, 5);
+    test(S("qgmetnabkl"), "ldobhmqcafnjtkeisgrp", 10, 20, S::npos);
+    test(S("cqjohampgd"), "", 11, 0, 9);
+    test(S("hobitmpsan"), "aocjb", 11, 0, 9);
+    test(S("tjehkpsalm"), "jbrnk", 11, 1, 9);
+    test(S("ngfbojitcl"), "tqedg", 11, 2, 9);
+    test(S("rcfkdbhgjo"), "nqskp", 11, 4, 9);
+    test(S("qghptonrea"), "eaqkl", 11, 5, 7);
+    test(S("hnprfgqjdl"), "reaoicljqm", 11, 0, 9);
+    test(S("hlmgabenti"), "lsftgajqpm", 11, 1, 9);
+    test(S("ofcjanmrbs"), "rlpfogmits", 11, 5, 9);
+    test(S("jqedtkornm"), "shkncmiaqj", 11, 9, 7);
+    test(S("rfedlasjmg"), "fpnatrhqgs", 11, 10, 8);
+    test(S("talpqjsgkm"), "sjclemqhnpdbgikarfot", 11, 0, 9);
+    test(S("lrkcbtqpie"), "otcmedjikgsfnqbrhpla", 11, 1, 9);
+    test(S("cipogdskjf"), "bonsaefdqiprkhlgtjcm", 11, 10, 8);
+    test(S("nqedcojahi"), "egpscmahijlfnkrodqtb", 11, 19, S::npos);
+    test(S("hefnrkmctj"), "kmqbfepjthgilscrndoa", 11, 20, S::npos);
+    test(S("atqirnmekfjolhpdsgcb"), "", 0, 0, 0);
+    test(S("echfkmlpribjnqsaogtd"), "prboq", 0, 0, 0);
+    test(S("qnhiftdgcleajbpkrosm"), "fjcqh", 0, 1, 0);
+    test(S("chamfknorbedjitgslpq"), "fmosa", 0, 2, 0);
+    test(S("njhqpibfmtlkaecdrgso"), "qdbok", 0, 4, 0);
+    test(S("ebnghfsqkprmdcljoiat"), "amslg", 0, 5, 0);
+    test(S("letjomsgihfrpqbkancd"), "smpltjneqb", 0, 0, 0);
+    test(S("nblgoipcrqeaktshjdmf"), "flitskrnge", 0, 1, 0);
+    test(S("cehkbngtjoiflqapsmrd"), "pgqihmlbef", 0, 5, 0);
+    test(S("mignapfoklbhcqjetdrs"), "cfpdqjtgsb", 0, 9, 0);
+    test(S("ceatbhlsqjgpnokfrmdi"), "htpsiaflom", 0, 10, 0);
+    test(S("ocihkjgrdelpfnmastqb"), "kpjfiaceghsrdtlbnomq", 0, 0, 0);
+    test(S("noelgschdtbrjfmiqkap"), "qhtbomidljgafneksprc", 0, 1, 0);
+    test(S("dkclqfombepritjnghas"), "nhtjobkcefldimpsaqgr", 0, 10, 0);
+    test(S("miklnresdgbhqcojftap"), "prabcjfqnoeskilmtgdh", 0, 19, S::npos);
+    test(S("htbcigojaqmdkfrnlsep"), "dtrgmchilkasqoebfpjn", 0, 20, S::npos);
+    test(S("febhmqtjanokscdirpgl"), "", 1, 0, 1);
+    test(S("loakbsqjpcrdhftniegm"), "sqome", 1, 0, 1);
+    test(S("reagphsqflbitdcjmkno"), "smfte", 1, 1, 1);
+    test(S("jitlfrqemsdhkopncabg"), "ciboh", 1, 2, 0);
+    test(S("mhtaepscdnrjqgbkifol"), "haois", 1, 4, 0);
+    test(S("tocesrfmnglpbjihqadk"), "abfki", 1, 5, 1);
+    test(S("lpfmctjrhdagneskbqoi"), "frdkocntmq", 1, 0, 1);
+    test(S("lsmqaepkdhncirbtjfgo"), "oasbpedlnr", 1, 1, 1);
+    test(S("epoiqmtldrabnkjhcfsg"), "kltqmhgand", 1, 5, 1);
+    test(S("emgasrilpknqojhtbdcf"), "gdtfjchpmr", 1, 9, 0);
+    test(S("hnfiagdpcklrjetqbsom"), "ponmcqblet", 1, 10, 0);
+    test(S("nsdfebgajhmtricpoklq"), "sgphqdnofeiklatbcmjr", 1, 0, 1);
+    test(S("atjgfsdlpobmeiqhncrk"), "ljqprsmigtfoneadckbh", 1, 1, 1);
+    test(S("sitodfgnrejlahcbmqkp"), "ligeojhafnkmrcsqtbdp", 1, 10, 0);
+    test(S("fraghmbiceknltjpqosd"), "lsimqfnjarbopedkhcgt", 1, 19, S::npos);
+    test(S("pmafenlhqtdbkirjsogc"), "abedmfjlghniorcqptks", 1, 20, S::npos);
+    test(S("pihgmoeqtnakrjslcbfd"), "", 10, 0, 10);
+    test(S("gjdkeprctqblnhiafsom"), "hqtoa", 10, 0, 10);
+    test(S("mkpnblfdsahrcqijteog"), "cahif", 10, 1, 10);
+    test(S("gckarqnelodfjhmbptis"), "kehis", 10, 2, 10);
+    test(S("gqpskidtbclomahnrjfe"), "kdlmh", 10, 4, 9);
+    test(S("pkldjsqrfgitbhmaecno"), "paeql", 10, 5, 10);
+    test(S("aftsijrbeklnmcdqhgop"), "aghoqiefnb", 10, 0, 10);
+    test(S("mtlgdrhafjkbiepqnsoc"), "jrbqaikpdo", 10, 1, 10);
+    test(S("pqgirnaefthokdmbsclj"), "smjonaeqcl", 10, 5, 10);
+    test(S("kpdbgjmtherlsfcqoina"), "eqbdrkcfah", 10, 9, 8);
+    test(S("jrlbothiknqmdgcfasep"), "kapmsienhf", 10, 10, 10);
+    test(S("mjogldqferckabinptsh"), "jpqotrlenfcsbhkaimdg", 10, 0, 10);
+    test(S("apoklnefbhmgqcdrisjt"), "jlbmhnfgtcqprikeados", 10, 1, 10);
+    test(S("ifeopcnrjbhkdgatmqls"), "stgbhfmdaljnpqoicker", 10, 10, 8);
+    test(S("ckqhaiesmjdnrgolbtpf"), "oihcetflbjagdsrkmqpn", 10, 19, S::npos);
+    test(S("bnlgapfimcoterskqdjh"), "adtclebmnpjsrqfkigoh", 10, 20, S::npos);
+    test(S("kgdlrobpmjcthqsafeni"), "", 19, 0, 19);
+    test(S("dfkechomjapgnslbtqir"), "beafg", 19, 0, 19);
+    test(S("rloadknfbqtgmhcsipje"), "iclat", 19, 1, 19);
+    test(S("mgjhkolrnadqbpetcifs"), "rkhnf", 19, 2, 19);
+    test(S("cmlfakiojdrgtbsphqen"), "clshq", 19, 4, 19);
+    test(S("kghbfipeomsntdalrqjc"), "dtcoj", 19, 5, 17);
+    test(S("eldiqckrnmtasbghjfpo"), "rqosnjmfth", 19, 0, 19);
+    test(S("abqjcfedgotihlnspkrm"), "siatdfqglh", 19, 1, 19);
+    test(S("qfbadrtjsimkolcenhpg"), "mrlshtpgjq", 19, 5, 19);
+    test(S("abseghclkjqifmtodrnp"), "adlcskgqjt", 19, 9, 19);
+    test(S("ibmsnlrjefhtdokacqpg"), "drshcjknaf", 19, 10, 19);
+    test(S("mrkfciqjebaponsthldg"), "etsaqroinghpkjdlfcbm", 19, 0, 19);
+    test(S("mjkticdeoqshpalrfbgn"), "sgepdnkqliambtrocfhj", 19, 1, 19);
+    test(S("rqnoclbdejgiphtfsakm"), "nlmcjaqgbsortfdihkpe", 19, 10, 18);
+    test(S("plkqbhmtfaeodjcrsing"), "racfnpmosldibqkghjet", 19, 19, 7);
+    test(S("oegalhmstjrfickpbndq"), "fjhdsctkqeiolagrnmbp", 19, 20, S::npos);
+    test(S("rdtgjcaohpblniekmsfq"), "", 20, 0, 19);
+    test(S("ofkqbnjetrmsaidphglc"), "ejanp", 20, 0, 19);
+    test(S("grkpahljcftesdmonqib"), "odife", 20, 1, 19);
+    test(S("jimlgbhfqkteospardcn"), "okaqd", 20, 2, 19);
+    test(S("gftenihpmslrjkqadcob"), "lcdbi", 20, 4, 18);
+    test(S("bmhldogtckrfsanijepq"), "fsqbj", 20, 5, 18);
+    test(S("nfqkrpjdesabgtlcmoih"), "bigdomnplq", 20, 0, 19);
+    test(S("focalnrpiqmdkstehbjg"), "apiblotgcd", 20, 1, 19);
+    test(S("rhqdspkmebiflcotnjga"), "acfhdenops", 20, 5, 18);
+    test(S("rahdtmsckfboqlpniegj"), "jopdeamcrk", 20, 9, 18);
+    test(S("fbkeiopclstmdqranjhg"), "trqncbkgmh", 20, 10, 17);
+    test(S("lifhpdgmbconstjeqark"), "tomglrkencbsfjqpihda", 20, 0, 19);
+}
+
+template <class S>
+void test3()
+{
+    test(S("pboqganrhedjmltsicfk"), "gbkhdnpoietfcmrslajq", 20, 1, 19);
+    test(S("klchabsimetjnqgorfpd"), "rtfnmbsglkjaichoqedp", 20, 10, 19);
+    test(S("sirfgmjqhctndbklaepo"), "ohkmdpfqbsacrtjnlgei", 20, 19, 1);
+    test(S("rlbdsiceaonqjtfpghkm"), "dlbrteoisgphmkncajfq", 20, 20, S::npos);
+    test(S("ecgdanriptblhjfqskom"), "", 21, 0, 19);
+    test(S("fdmiarlpgcskbhoteqjn"), "sjrlo", 21, 0, 19);
+    test(S("rlbstjqopignecmfadkh"), "qjpor", 21, 1, 19);
+    test(S("grjpqmbshektdolcafni"), "odhfn", 21, 2, 19);
+    test(S("sakfcohtqnibprjmlged"), "qtfin", 21, 4, 19);
+    test(S("mjtdglasihqpocebrfkn"), "hpqfo", 21, 5, 19);
+    test(S("okaplfrntghqbmeicsdj"), "fabmertkos", 21, 0, 19);
+    test(S("sahngemrtcjidqbklfpo"), "brqtgkmaej", 21, 1, 19);
+    test(S("dlmsipcnekhbgoaftqjr"), "nfrdeihsgl", 21, 5, 18);
+    test(S("ahegrmqnoiklpfsdbcjt"), "hlfrosekpi", 21, 9, 19);
+    test(S("hdsjbnmlegtkqripacof"), "atgbkrjdsm", 21, 10, 19);
+    test(S("pcnedrfjihqbalkgtoms"), "blnrptjgqmaifsdkhoec", 21, 0, 19);
+    test(S("qjidealmtpskrbfhocng"), "ctpmdahebfqjgknloris", 21, 1, 19);
+    test(S("qeindtagmokpfhsclrbj"), "apnkeqthrmlbfodiscgj", 21, 10, 19);
+    test(S("kpfegbjhsrnodltqciam"), "jdgictpframeoqlsbknh", 21, 19, 7);
+    test(S("hnbrcplsjfgiktoedmaq"), "qprlsfojamgndekthibc", 21, 20, S::npos);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test0<S>();
+    test1<S>();
+    test2<S>();
+    test3<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_last_not_of( "",      0, 0) == SV::npos, "" );
+    static_assert (sv1.find_last_not_of( "irkhs", 0, 5) == SV::npos, "" );
+    static_assert (sv2.find_last_not_of( "",      0, 0) == 0, "" );
+    static_assert (sv2.find_last_not_of( "gfsrt", 5, 0) == 4, "" );
+    static_assert (sv2.find_last_not_of( "lecar", 5, 0) == 4, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.find/find_last_not_of_string_view_size.pass.cpp

@@ -0,0 +1,148 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// size_type find_last_not_of(const basic_string& str, size_type pos = npos) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type pos, typename S::size_type x)
+{
+    assert(s.find_last_not_of(str, pos) == x);
+    if (x != S::npos)
+        assert(x <= pos && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type x)
+{
+    assert(s.find_last_not_of(str) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), S(""), 0, S::npos);
+    test(S(""), S("laenf"), 0, S::npos);
+    test(S(""), S("pqlnkmbdjo"), 0, S::npos);
+    test(S(""), S("qkamfogpnljdcshbreti"), 0, S::npos);
+    test(S(""), S(""), 1, S::npos);
+    test(S(""), S("bjaht"), 1, S::npos);
+    test(S(""), S("hjlcmgpket"), 1, S::npos);
+    test(S(""), S("htaobedqikfplcgjsmrn"), 1, S::npos);
+    test(S("fodgq"), S(""), 0, 0);
+    test(S("qanej"), S("dfkap"), 0, 0);
+    test(S("clbao"), S("ihqrfebgad"), 0, 0);
+    test(S("mekdn"), S("ngtjfcalbseiqrphmkdo"), 0, S::npos);
+    test(S("srdfq"), S(""), 1, 1);
+    test(S("oemth"), S("ikcrq"), 1, 1);
+    test(S("cdaih"), S("dmajblfhsg"), 1, 0);
+    test(S("qohtk"), S("oqftjhdmkgsblacenirp"), 1, S::npos);
+    test(S("cshmd"), S(""), 2, 2);
+    test(S("lhcdo"), S("oebqi"), 2, 2);
+    test(S("qnsoh"), S("kojhpmbsfe"), 2, 1);
+    test(S("pkrof"), S("acbsjqogpltdkhinfrem"), 2, S::npos);
+    test(S("fmtsp"), S(""), 4, 4);
+    test(S("khbpm"), S("aobjd"), 4, 4);
+    test(S("pbsji"), S("pcbahntsje"), 4, 4);
+    test(S("mprdj"), S("fhepcrntkoagbmldqijs"), 4, S::npos);
+    test(S("eqmpa"), S(""), 5, 4);
+    test(S("omigs"), S("kocgb"), 5, 4);
+    test(S("onmje"), S("fbslrjiqkm"), 5, 4);
+    test(S("oqmrj"), S("jeidpcmalhfnqbgtrsko"), 5, S::npos);
+    test(S("schfa"), S(""), 6, 4);
+    test(S("igdsc"), S("qngpd"), 6, 4);
+    test(S("brqgo"), S("rodhqklgmb"), 6, S::npos);
+    test(S("tnrph"), S("thdjgafrlbkoiqcspmne"), 6, S::npos);
+    test(S("hcjitbfapl"), S(""), 0, 0);
+    test(S("daiprenocl"), S("ashjd"), 0, S::npos);
+    test(S("litpcfdghe"), S("mgojkldsqh"), 0, S::npos);
+    test(S("aidjksrolc"), S("imqnaghkfrdtlopbjesc"), 0, S::npos);
+    test(S("qpghtfbaji"), S(""), 1, 1);
+    test(S("gfshlcmdjr"), S("nadkh"), 1, 1);
+    test(S("nkodajteqp"), S("ofdrqmkebl"), 1, 0);
+    test(S("gbmetiprqd"), S("bdfjqgatlksriohemnpc"), 1, S::npos);
+    test(S("crnklpmegd"), S(""), 5, 5);
+    test(S("jsbtafedoc"), S("prqgn"), 5, 5);
+    test(S("qnmodrtkeb"), S("pejafmnokr"), 5, 4);
+    test(S("cpebqsfmnj"), S("odnqkgijrhabfmcestlp"), 5, S::npos);
+    test(S("lmofqdhpki"), S(""), 9, 9);
+    test(S("hnefkqimca"), S("rtjpa"), 9, 8);
+    test(S("drtasbgmfp"), S("ktsrmnqagd"), 9, 9);
+    test(S("lsaijeqhtr"), S("rtdhgcisbnmoaqkfpjle"), 9, S::npos);
+    test(S("elgofjmbrq"), S(""), 10, 9);
+    test(S("mjqdgalkpc"), S("dplqa"), 10, 9);
+    test(S("kthqnfcerm"), S("dkacjoptns"), 10, 9);
+    test(S("dfsjhanorc"), S("hqfimtrgnbekpdcsjalo"), 10, S::npos);
+    test(S("eqsgalomhb"), S(""), 11, 9);
+    test(S("akiteljmoh"), S("lofbc"), 11, 9);
+    test(S("hlbdfreqjo"), S("astoegbfpn"), 11, 8);
+    test(S("taqobhlerg"), S("pdgreqomsncafklhtibj"), 11, S::npos);
+    test(S("snafbdlghrjkpqtoceim"), S(""), 0, 0);
+    test(S("aemtbrgcklhndjisfpoq"), S("lbtqd"), 0, 0);
+    test(S("pnracgfkjdiholtbqsem"), S("tboimldpjh"), 0, S::npos);
+    test(S("dicfltehbsgrmojnpkaq"), S("slcerthdaiqjfnobgkpm"), 0, S::npos);
+    test(S("jlnkraeodhcspfgbqitm"), S(""), 1, 1);
+    test(S("lhosrngtmfjikbqpcade"), S("aqibs"), 1, 1);
+    test(S("rbtaqjhgkneisldpmfoc"), S("gtfblmqinc"), 1, 0);
+    test(S("gpifsqlrdkbonjtmheca"), S("mkqpbtdalgniorhfescj"), 1, S::npos);
+    test(S("hdpkobnsalmcfijregtq"), S(""), 10, 10);
+    test(S("jtlshdgqaiprkbcoenfm"), S("pblas"), 10, 9);
+    test(S("fkdrbqltsgmcoiphneaj"), S("arosdhcfme"), 10, 9);
+    test(S("crsplifgtqedjohnabmk"), S("blkhjeogicatqfnpdmsr"), 10, S::npos);
+    test(S("niptglfbosehkamrdqcj"), S(""), 19, 19);
+    test(S("copqdhstbingamjfkler"), S("djkqc"), 19, 19);
+    test(S("mrtaefilpdsgocnhqbjk"), S("lgokshjtpb"), 19, 16);
+    test(S("kojatdhlcmigpbfrqnes"), S("bqjhtkfepimcnsgrlado"), 19, S::npos);
+    test(S("eaintpchlqsbdgrkjofm"), S(""), 20, 19);
+    test(S("gjnhidfsepkrtaqbmclo"), S("nocfa"), 20, 18);
+    test(S("spocfaktqdbiejlhngmr"), S("bgtajmiedc"), 20, 19);
+    test(S("rphmlekgfscndtaobiqj"), S("lsckfnqgdahejiopbtmr"), 20, S::npos);
+    test(S("liatsqdoegkmfcnbhrpj"), S(""), 21, 19);
+    test(S("binjagtfldkrspcomqeh"), S("gfsrt"), 21, 19);
+    test(S("latkmisecnorjbfhqpdg"), S("pfsocbhjtm"), 21, 19);
+    test(S("lecfratdjkhnsmqpoigb"), S("tpflmdnoicjgkberhqsa"), 21, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), S(""), S::npos);
+    test(S(""), S("laenf"), S::npos);
+    test(S(""), S("pqlnkmbdjo"), S::npos);
+    test(S(""), S("qkamfogpnljdcshbreti"), S::npos);
+    test(S("nhmko"), S(""), 4);
+    test(S("lahfb"), S("irkhs"), 4);
+    test(S("gmfhd"), S("kantesmpgj"), 4);
+    test(S("odaft"), S("oknlrstdpiqmjbaghcfe"), S::npos);
+    test(S("eolhfgpjqk"), S(""), 9);
+    test(S("nbatdlmekr"), S("bnrpe"), 8);
+    test(S("jdmciepkaq"), S("jtdaefblso"), 9);
+    test(S("hkbgspoflt"), S("oselktgbcapndfjihrmq"), S::npos);
+    test(S("gprdcokbnjhlsfmtieqa"), S(""), 19);
+    test(S("qjghlnftcaismkropdeb"), S("bjaht"), 18);
+    test(S("pnalfrdtkqcmojiesbhg"), S("hjlcmgpket"), 17);
+    test(S("pniotcfrhqsmgdkjbael"), S("htaobedqikfplcgjsmrn"), S::npos);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+}

test/experimental/string.view/string.view.find/find_last_of_char_size.pass.cpp

@@ -0,0 +1,82 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type find_last_of(charT c, size_type pos = npos) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.find_last_of(c, pos) == x);
+    if (x != S::npos)
+        assert(x <= pos && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type x)
+{
+    assert(s.find_last_of(c) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test(S(""), 'm', 0, S::npos);
+    test(S(""), 'm', 1, S::npos);
+    test(S("kitcj"), 'm', 0, S::npos);
+    test(S("qkamf"), 'm', 1, S::npos);
+    test(S("nhmko"), 'm', 2, 2);
+    test(S("tpsaf"), 'm', 4, S::npos);
+    test(S("lahfb"), 'm', 5, S::npos);
+    test(S("irkhs"), 'm', 6, S::npos);
+    test(S("gmfhdaipsr"), 'm', 0, S::npos);
+    test(S("kantesmpgj"), 'm', 1, S::npos);
+    test(S("odaftiegpm"), 'm', 5, S::npos);
+    test(S("oknlrstdpi"), 'm', 9, S::npos);
+    test(S("eolhfgpjqk"), 'm', 10, S::npos);
+    test(S("pcdrofikas"), 'm', 11, S::npos);
+    test(S("nbatdlmekrgcfqsophij"), 'm', 0, S::npos);
+    test(S("bnrpehidofmqtcksjgla"), 'm', 1, S::npos);
+    test(S("jdmciepkaqgotsrfnhlb"), 'm', 10, 2);
+    test(S("jtdaefblsokrmhpgcnqi"), 'm', 19, 12);
+    test(S("hkbgspofltajcnedqmri"), 'm', 20, 17);
+    test(S("oselktgbcapndfjihrmq"), 'm', 21, 18);
+
+    test(S(""), 'm', S::npos);
+    test(S("csope"), 'm', S::npos);
+    test(S("gfsmthlkon"), 'm', 3);
+    test(S("laenfsbridchgotmkqpj"), 'm', 15);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_last_of( 'i', 0 ) == SV::npos, "" );
+    static_assert (sv1.find_last_of( 'i', 1 ) == SV::npos, "" );
+    static_assert (sv2.find_last_of( 'a', 0 ) == 0, "" );
+    static_assert (sv2.find_last_of( 'a', 1 ) == 0, "" );
+    static_assert (sv2.find_last_of( 'e', 5 ) == 4, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.find/find_last_of_pointer_size.pass.cpp

@@ -0,0 +1,165 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type find_last_of(const charT* s, size_type pos = npos) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.find_last_of(str, pos) == x);
+    if (x != S::npos)
+        assert(x <= pos && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type x)
+{
+    assert(s.find_last_of(str) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, S::npos);
+    test(S(""), "laenf", 0, S::npos);
+    test(S(""), "pqlnkmbdjo", 0, S::npos);
+    test(S(""), "qkamfogpnljdcshbreti", 0, S::npos);
+    test(S(""), "", 1, S::npos);
+    test(S(""), "bjaht", 1, S::npos);
+    test(S(""), "hjlcmgpket", 1, S::npos);
+    test(S(""), "htaobedqikfplcgjsmrn", 1, S::npos);
+    test(S("fodgq"), "", 0, S::npos);
+    test(S("qanej"), "dfkap", 0, S::npos);
+    test(S("clbao"), "ihqrfebgad", 0, S::npos);
+    test(S("mekdn"), "ngtjfcalbseiqrphmkdo", 0, 0);
+    test(S("srdfq"), "", 1, S::npos);
+    test(S("oemth"), "ikcrq", 1, S::npos);
+    test(S("cdaih"), "dmajblfhsg", 1, 1);
+    test(S("qohtk"), "oqftjhdmkgsblacenirp", 1, 1);
+    test(S("cshmd"), "", 2, S::npos);
+    test(S("lhcdo"), "oebqi", 2, S::npos);
+    test(S("qnsoh"), "kojhpmbsfe", 2, 2);
+    test(S("pkrof"), "acbsjqogpltdkhinfrem", 2, 2);
+    test(S("fmtsp"), "", 4, S::npos);
+    test(S("khbpm"), "aobjd", 4, 2);
+    test(S("pbsji"), "pcbahntsje", 4, 3);
+    test(S("mprdj"), "fhepcrntkoagbmldqijs", 4, 4);
+    test(S("eqmpa"), "", 5, S::npos);
+    test(S("omigs"), "kocgb", 5, 3);
+    test(S("onmje"), "fbslrjiqkm", 5, 3);
+    test(S("oqmrj"), "jeidpcmalhfnqbgtrsko", 5, 4);
+    test(S("schfa"), "", 6, S::npos);
+    test(S("igdsc"), "qngpd", 6, 2);
+    test(S("brqgo"), "rodhqklgmb", 6, 4);
+    test(S("tnrph"), "thdjgafrlbkoiqcspmne", 6, 4);
+    test(S("hcjitbfapl"), "", 0, S::npos);
+    test(S("daiprenocl"), "ashjd", 0, 0);
+    test(S("litpcfdghe"), "mgojkldsqh", 0, 0);
+    test(S("aidjksrolc"), "imqnaghkfrdtlopbjesc", 0, 0);
+    test(S("qpghtfbaji"), "", 1, S::npos);
+    test(S("gfshlcmdjr"), "nadkh", 1, S::npos);
+    test(S("nkodajteqp"), "ofdrqmkebl", 1, 1);
+    test(S("gbmetiprqd"), "bdfjqgatlksriohemnpc", 1, 1);
+    test(S("crnklpmegd"), "", 5, S::npos);
+    test(S("jsbtafedoc"), "prqgn", 5, S::npos);
+    test(S("qnmodrtkeb"), "pejafmnokr", 5, 5);
+    test(S("cpebqsfmnj"), "odnqkgijrhabfmcestlp", 5, 5);
+    test(S("lmofqdhpki"), "", 9, S::npos);
+    test(S("hnefkqimca"), "rtjpa", 9, 9);
+    test(S("drtasbgmfp"), "ktsrmnqagd", 9, 7);
+    test(S("lsaijeqhtr"), "rtdhgcisbnmoaqkfpjle", 9, 9);
+    test(S("elgofjmbrq"), "", 10, S::npos);
+    test(S("mjqdgalkpc"), "dplqa", 10, 8);
+    test(S("kthqnfcerm"), "dkacjoptns", 10, 6);
+    test(S("dfsjhanorc"), "hqfimtrgnbekpdcsjalo", 10, 9);
+    test(S("eqsgalomhb"), "", 11, S::npos);
+    test(S("akiteljmoh"), "lofbc", 11, 8);
+    test(S("hlbdfreqjo"), "astoegbfpn", 11, 9);
+    test(S("taqobhlerg"), "pdgreqomsncafklhtibj", 11, 9);
+    test(S("snafbdlghrjkpqtoceim"), "", 0, S::npos);
+    test(S("aemtbrgcklhndjisfpoq"), "lbtqd", 0, S::npos);
+    test(S("pnracgfkjdiholtbqsem"), "tboimldpjh", 0, 0);
+    test(S("dicfltehbsgrmojnpkaq"), "slcerthdaiqjfnobgkpm", 0, 0);
+    test(S("jlnkraeodhcspfgbqitm"), "", 1, S::npos);
+    test(S("lhosrngtmfjikbqpcade"), "aqibs", 1, S::npos);
+    test(S("rbtaqjhgkneisldpmfoc"), "gtfblmqinc", 1, 1);
+    test(S("gpifsqlrdkbonjtmheca"), "mkqpbtdalgniorhfescj", 1, 1);
+    test(S("hdpkobnsalmcfijregtq"), "", 10, S::npos);
+    test(S("jtlshdgqaiprkbcoenfm"), "pblas", 10, 10);
+    test(S("fkdrbqltsgmcoiphneaj"), "arosdhcfme", 10, 10);
+    test(S("crsplifgtqedjohnabmk"), "blkhjeogicatqfnpdmsr", 10, 10);
+    test(S("niptglfbosehkamrdqcj"), "", 19, S::npos);
+    test(S("copqdhstbingamjfkler"), "djkqc", 19, 16);
+    test(S("mrtaefilpdsgocnhqbjk"), "lgokshjtpb", 19, 19);
+    test(S("kojatdhlcmigpbfrqnes"), "bqjhtkfepimcnsgrlado", 19, 19);
+    test(S("eaintpchlqsbdgrkjofm"), "", 20, S::npos);
+    test(S("gjnhidfsepkrtaqbmclo"), "nocfa", 20, 19);
+    test(S("spocfaktqdbiejlhngmr"), "bgtajmiedc", 20, 18);
+    test(S("rphmlekgfscndtaobiqj"), "lsckfnqgdahejiopbtmr", 20, 19);
+    test(S("liatsqdoegkmfcnbhrpj"), "", 21, S::npos);
+    test(S("binjagtfldkrspcomqeh"), "gfsrt", 21, 12);
+    test(S("latkmisecnorjbfhqpdg"), "pfsocbhjtm", 21, 17);
+    test(S("lecfratdjkhnsmqpoigb"), "tpflmdnoicjgkberhqsa", 21, 19);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), "", S::npos);
+    test(S(""), "laenf", S::npos);
+    test(S(""), "pqlnkmbdjo", S::npos);
+    test(S(""), "qkamfogpnljdcshbreti", S::npos);
+    test(S("nhmko"), "", S::npos);
+    test(S("lahfb"), "irkhs", 2);
+    test(S("gmfhd"), "kantesmpgj", 1);
+    test(S("odaft"), "oknlrstdpiqmjbaghcfe", 4);
+    test(S("eolhfgpjqk"), "", S::npos);
+    test(S("nbatdlmekr"), "bnrpe", 9);
+    test(S("jdmciepkaq"), "jtdaefblso", 8);
+    test(S("hkbgspoflt"), "oselktgbcapndfjihrmq", 9);
+    test(S("gprdcokbnjhlsfmtieqa"), "", S::npos);
+    test(S("qjghlnftcaismkropdeb"), "bjaht", 19);
+    test(S("pnalfrdtkqcmojiesbhg"), "hjlcmgpket", 19);
+    test(S("pniotcfrhqsmgdkjbael"), "htaobedqikfplcgjsmrn", 19);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_last_of( "",      0) == SV::npos, "" );
+    static_assert (sv1.find_last_of( "irkhs", 5) == SV::npos, "" );
+    static_assert (sv2.find_last_of( "",      0) == SV::npos, "" );
+    static_assert (sv2.find_last_of( "gfsrt", 5) == SV::npos, "" );
+    static_assert (sv2.find_last_of( "lecar", 5) == 4, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.find/find_last_of_pointer_size_size.pass.cpp

@@ -0,0 +1,392 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type find_last_of(const charT* s, size_type pos, size_type n) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type n, typename S::size_type x)
+{
+    assert(s.find_last_of(str, pos, n) == x);
+    if (x != S::npos)
+        assert(x <= pos && x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, 0, S::npos);
+    test(S(""), "irkhs", 0, 0, S::npos);
+    test(S(""), "kante", 0, 1, S::npos);
+    test(S(""), "oknlr", 0, 2, S::npos);
+    test(S(""), "pcdro", 0, 4, S::npos);
+    test(S(""), "bnrpe", 0, 5, S::npos);
+    test(S(""), "jtdaefblso", 0, 0, S::npos);
+    test(S(""), "oselktgbca", 0, 1, S::npos);
+    test(S(""), "eqgaplhckj", 0, 5, S::npos);
+    test(S(""), "bjahtcmnlp", 0, 9, S::npos);
+    test(S(""), "hjlcmgpket", 0, 10, S::npos);
+    test(S(""), "htaobedqikfplcgjsmrn", 0, 0, S::npos);
+    test(S(""), "hpqiarojkcdlsgnmfetb", 0, 1, S::npos);
+    test(S(""), "dfkaprhjloqetcsimnbg", 0, 10, S::npos);
+    test(S(""), "ihqrfebgadntlpmjksoc", 0, 19, S::npos);
+    test(S(""), "ngtjfcalbseiqrphmkdo", 0, 20, S::npos);
+    test(S(""), "", 1, 0, S::npos);
+    test(S(""), "lbtqd", 1, 0, S::npos);
+    test(S(""), "tboim", 1, 1, S::npos);
+    test(S(""), "slcer", 1, 2, S::npos);
+    test(S(""), "cbjfs", 1, 4, S::npos);
+    test(S(""), "aqibs", 1, 5, S::npos);
+    test(S(""), "gtfblmqinc", 1, 0, S::npos);
+    test(S(""), "mkqpbtdalg", 1, 1, S::npos);
+    test(S(""), "kphatlimcd", 1, 5, S::npos);
+    test(S(""), "pblasqogic", 1, 9, S::npos);
+    test(S(""), "arosdhcfme", 1, 10, S::npos);
+    test(S(""), "blkhjeogicatqfnpdmsr", 1, 0, S::npos);
+    test(S(""), "bmhineprjcoadgstflqk", 1, 1, S::npos);
+    test(S(""), "djkqcmetslnghpbarfoi", 1, 10, S::npos);
+    test(S(""), "lgokshjtpbemarcdqnfi", 1, 19, S::npos);
+    test(S(""), "bqjhtkfepimcnsgrlado", 1, 20, S::npos);
+    test(S("eaint"), "", 0, 0, S::npos);
+    test(S("binja"), "gfsrt", 0, 0, S::npos);
+    test(S("latkm"), "pfsoc", 0, 1, S::npos);
+    test(S("lecfr"), "tpflm", 0, 2, S::npos);
+    test(S("eqkst"), "sgkec", 0, 4, 0);
+    test(S("cdafr"), "romds", 0, 5, S::npos);
+    test(S("prbhe"), "qhjistlgmr", 0, 0, S::npos);
+    test(S("lbisk"), "pedfirsglo", 0, 1, S::npos);
+    test(S("hrlpd"), "aqcoslgrmk", 0, 5, S::npos);
+    test(S("ehmja"), "dabckmepqj", 0, 9, 0);
+    test(S("mhqgd"), "pqscrjthli", 0, 10, S::npos);
+    test(S("tgklq"), "kfphdcsjqmobliagtren", 0, 0, S::npos);
+    test(S("bocjs"), "rokpefncljibsdhqtagm", 0, 1, S::npos);
+    test(S("grbsd"), "afionmkphlebtcjqsgrd", 0, 10, S::npos);
+    test(S("ofjqr"), "aenmqplidhkofrjbctsg", 0, 19, 0);
+    test(S("btlfi"), "osjmbtcadhiklegrpqnf", 0, 20, 0);
+    test(S("clrgb"), "", 1, 0, S::npos);
+    test(S("tjmek"), "osmia", 1, 0, S::npos);
+    test(S("bgstp"), "ckonl", 1, 1, S::npos);
+    test(S("hstrk"), "ilcaj", 1, 2, S::npos);
+    test(S("kmspj"), "lasiq", 1, 4, S::npos);
+    test(S("tjboh"), "kfqmr", 1, 5, S::npos);
+    test(S("ilbcj"), "klnitfaobg", 1, 0, S::npos);
+    test(S("jkngf"), "gjhmdlqikp", 1, 1, S::npos);
+    test(S("gfcql"), "skbgtahqej", 1, 5, 0);
+    test(S("dqtlg"), "bjsdgtlpkf", 1, 9, 0);
+    test(S("bthpg"), "bjgfmnlkio", 1, 10, 0);
+    test(S("dgsnq"), "lbhepotfsjdqigcnamkr", 1, 0, S::npos);
+    test(S("rmfhp"), "tebangckmpsrqdlfojhi", 1, 1, S::npos);
+    test(S("jfdam"), "joflqbdkhtegimscpanr", 1, 10, 1);
+    test(S("edapb"), "adpmcohetfbsrjinlqkg", 1, 19, 1);
+    test(S("brfsm"), "iacldqjpfnogbsrhmetk", 1, 20, 1);
+    test(S("ndrhl"), "", 2, 0, S::npos);
+    test(S("mrecp"), "otkgb", 2, 0, S::npos);
+    test(S("qlasf"), "cqsjl", 2, 1, S::npos);
+    test(S("smaqd"), "dpifl", 2, 2, S::npos);
+    test(S("hjeni"), "oapht", 2, 4, 0);
+    test(S("ocmfj"), "cifts", 2, 5, 1);
+    test(S("hmftq"), "nmsckbgalo", 2, 0, S::npos);
+    test(S("fklad"), "tpksqhamle", 2, 1, S::npos);
+    test(S("dirnm"), "tpdrchmkji", 2, 5, 2);
+    test(S("hrgdc"), "ijagfkblst", 2, 9, 2);
+    test(S("ifakg"), "kpocsignjb", 2, 10, 0);
+    test(S("ebrgd"), "pecqtkjsnbdrialgmohf", 2, 0, S::npos);
+    test(S("rcjml"), "aiortphfcmkjebgsndql", 2, 1, S::npos);
+    test(S("peqmt"), "sdbkeamglhipojqftrcn", 2, 10, 1);
+    test(S("frehn"), "ljqncehgmfktroapidbs", 2, 19, 2);
+    test(S("tqolf"), "rtcfodilamkbenjghqps", 2, 20, 2);
+    test(S("cjgao"), "", 4, 0, S::npos);
+    test(S("kjplq"), "mabns", 4, 0, S::npos);
+    test(S("herni"), "bdnrp", 4, 1, S::npos);
+    test(S("tadrb"), "scidp", 4, 2, S::npos);
+    test(S("pkfeo"), "agbjl", 4, 4, S::npos);
+    test(S("hoser"), "jfmpr", 4, 5, 4);
+    test(S("kgrsp"), "rbpefghsmj", 4, 0, S::npos);
+    test(S("pgejb"), "apsfntdoqc", 4, 1, S::npos);
+    test(S("thlnq"), "ndkjeisgcl", 4, 5, 3);
+    test(S("nbmit"), "rnfpqatdeo", 4, 9, 4);
+    test(S("jgmib"), "bntjlqrfik", 4, 10, 4);
+    test(S("ncrfj"), "kcrtmpolnaqejghsfdbi", 4, 0, S::npos);
+    test(S("ncsik"), "lobheanpkmqidsrtcfgj", 4, 1, S::npos);
+    test(S("sgbfh"), "athdkljcnreqbgpmisof", 4, 10, 4);
+    test(S("dktbn"), "qkdmjialrscpbhefgont", 4, 19, 4);
+    test(S("fthqm"), "dmasojntqleribkgfchp", 4, 20, 4);
+    test(S("klopi"), "", 5, 0, S::npos);
+    test(S("dajhn"), "psthd", 5, 0, S::npos);
+    test(S("jbgno"), "rpmjd", 5, 1, S::npos);
+    test(S("hkjae"), "dfsmk", 5, 2, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S("gbhqo"), "skqne", 5, 4, 3);
+    test(S("ktdor"), "kipnf", 5, 5, 0);
+    test(S("ldprn"), "hmrnqdgifl", 5, 0, S::npos);
+    test(S("egmjk"), "fsmjcdairn", 5, 1, S::npos);
+    test(S("armql"), "pcdgltbrfj", 5, 5, 4);
+    test(S("cdhjo"), "aekfctpirg", 5, 9, 0);
+    test(S("jcons"), "ledihrsgpf", 5, 10, 4);
+    test(S("cbrkp"), "mqcklahsbtirgopefndj", 5, 0, S::npos);
+    test(S("fhgna"), "kmlthaoqgecrnpdbjfis", 5, 1, S::npos);
+    test(S("ejfcd"), "sfhbamcdptojlkrenqgi", 5, 10, 4);
+    test(S("kqjhe"), "pbniofmcedrkhlstgaqj", 5, 19, 4);
+    test(S("pbdjl"), "mongjratcskbhqiepfdl", 5, 20, 4);
+    test(S("gajqn"), "", 6, 0, S::npos);
+    test(S("stedk"), "hrnat", 6, 0, S::npos);
+    test(S("tjkaf"), "gsqdt", 6, 1, S::npos);
+    test(S("dthpe"), "bspkd", 6, 2, S::npos);
+    test(S("klhde"), "ohcmb", 6, 4, 2);
+    test(S("bhlki"), "heatr", 6, 5, 1);
+    test(S("lqmoh"), "pmblckedfn", 6, 0, S::npos);
+    test(S("mtqin"), "aceqmsrbik", 6, 1, S::npos);
+    test(S("dpqbr"), "lmbtdehjrn", 6, 5, 3);
+    test(S("kdhmo"), "teqmcrlgib", 6, 9, 3);
+    test(S("jblqp"), "njolbmspac", 6, 10, 4);
+    test(S("qmjgl"), "pofnhidklamecrbqjgst", 6, 0, S::npos);
+    test(S("rothp"), "jbhckmtgrqnosafedpli", 6, 1, S::npos);
+    test(S("ghknq"), "dobntpmqklicsahgjerf", 6, 10, 4);
+    test(S("eopfi"), "tpdshainjkbfoemlrgcq", 6, 19, 4);
+    test(S("dsnmg"), "oldpfgeakrnitscbjmqh", 6, 20, 4);
+    test(S("jnkrfhotgl"), "", 0, 0, S::npos);
+    test(S("dltjfngbko"), "rqegt", 0, 0, S::npos);
+    test(S("bmjlpkiqde"), "dashm", 0, 1, S::npos);
+    test(S("skrflobnqm"), "jqirk", 0, 2, S::npos);
+    test(S("jkpldtshrm"), "rckeg", 0, 4, S::npos);
+    test(S("ghasdbnjqo"), "jscie", 0, 5, S::npos);
+    test(S("igrkhpbqjt"), "efsphndliq", 0, 0, S::npos);
+    test(S("ikthdgcamf"), "gdicosleja", 0, 1, S::npos);
+    test(S("pcofgeniam"), "qcpjibosfl", 0, 5, 0);
+    test(S("rlfjgesqhc"), "lrhmefnjcq", 0, 9, 0);
+    test(S("itphbqsker"), "dtablcrseo", 0, 10, S::npos);
+    test(S("skjafcirqm"), "apckjsftedbhgomrnilq", 0, 0, S::npos);
+    test(S("tcqomarsfd"), "pcbrgflehjtiadnsokqm", 0, 1, S::npos);
+    test(S("rocfeldqpk"), "nsiadegjklhobrmtqcpf", 0, 10, S::npos);
+    test(S("cfpegndlkt"), "cpmajdqnolikhgsbretf", 0, 19, 0);
+    test(S("fqbtnkeasj"), "jcflkntmgiqrphdosaeb", 0, 20, 0);
+    test(S("shbcqnmoar"), "", 1, 0, S::npos);
+    test(S("bdoshlmfin"), "ontrs", 1, 0, S::npos);
+    test(S("khfrebnsgq"), "pfkna", 1, 1, S::npos);
+    test(S("getcrsaoji"), "ekosa", 1, 2, 1);
+    test(S("fjiknedcpq"), "anqhk", 1, 4, S::npos);
+    test(S("tkejgnafrm"), "jekca", 1, 5, 1);
+    test(S("jnakolqrde"), "ikemsjgacf", 1, 0, S::npos);
+    test(S("lcjptsmgbe"), "arolgsjkhm", 1, 1, S::npos);
+    test(S("itfsmcjorl"), "oftkbldhre", 1, 5, 1);
+    test(S("omchkfrjea"), "gbkqdoeftl", 1, 9, 0);
+    test(S("cigfqkated"), "sqcflrgtim", 1, 10, 1);
+    test(S("tscenjikml"), "fmhbkislrjdpanogqcet", 1, 0, S::npos);
+    test(S("qcpaemsinf"), "rnioadktqlgpbcjsmhef", 1, 1, S::npos);
+    test(S("gltkojeipd"), "oakgtnldpsefihqmjcbr", 1, 10, 1);
+    test(S("qistfrgnmp"), "gbnaelosidmcjqktfhpr", 1, 19, 1);
+    test(S("bdnpfcqaem"), "akbripjhlosndcmqgfet", 1, 20, 1);
+    test(S("ectnhskflp"), "", 5, 0, S::npos);
+    test(S("fgtianblpq"), "pijag", 5, 0, S::npos);
+    test(S("mfeqklirnh"), "jrckd", 5, 1, S::npos);
+    test(S("astedncjhk"), "qcloh", 5, 2, S::npos);
+    test(S("fhlqgcajbr"), "thlmp", 5, 4, 2);
+    test(S("epfhocmdng"), "qidmo", 5, 5, 4);
+    test(S("apcnsibger"), "lnegpsjqrd", 5, 0, S::npos);
+    test(S("aqkocrbign"), "rjqdablmfs", 5, 1, 5);
+    test(S("ijsmdtqgce"), "enkgpbsjaq", 5, 5, S::npos);
+    test(S("clobgsrken"), "kdsgoaijfh", 5, 9, 5);
+    test(S("jbhcfposld"), "trfqgmckbe", 5, 10, 4);
+    test(S("oqnpblhide"), "igetsracjfkdnpoblhqm", 5, 0, S::npos);
+    test(S("lroeasctif"), "nqctfaogirshlekbdjpm", 5, 1, S::npos);
+    test(S("bpjlgmiedh"), "csehfgomljdqinbartkp", 5, 10, 5);
+    test(S("pamkeoidrj"), "qahoegcmplkfsjbdnitr", 5, 19, 5);
+    test(S("espogqbthk"), "dpteiajrqmsognhlfbkc", 5, 20, 5);
+    test(S("shoiedtcjb"), "", 9, 0, S::npos);
+    test(S("ebcinjgads"), "tqbnh", 9, 0, S::npos);
+    test(S("dqmregkcfl"), "akmle", 9, 1, S::npos);
+    test(S("ngcrieqajf"), "iqfkm", 9, 2, 6);
+    test(S("qosmilgnjb"), "tqjsr", 9, 4, 8);
+    test(S("ikabsjtdfl"), "jplqg", 9, 5, 9);
+    test(S("ersmicafdh"), "oilnrbcgtj", 9, 0, S::npos);
+    test(S("fdnplotmgh"), "morkglpesn", 9, 1, 7);
+    test(S("fdbicojerm"), "dmicerngat", 9, 5, 9);
+    test(S("mbtafndjcq"), "radgeskbtc", 9, 9, 6);
+    test(S("mlenkpfdtc"), "ljikprsmqo", 9, 10, 5);
+    test(S("ahlcifdqgs"), "trqihkcgsjamfdbolnpe", 9, 0, S::npos);
+    test(S("bgjemaltks"), "lqmthbsrekajgnofcipd", 9, 1, 6);
+    test(S("pdhslbqrfc"), "jtalmedribkgqsopcnfh", 9, 10, 7);
+    test(S("dirhtsnjkc"), "spqfoiclmtagejbndkrh", 9, 19, 9);
+    test(S("dlroktbcja"), "nmotklspigjrdhcfaebq", 9, 20, 9);
+    test(S("ncjpmaekbs"), "", 10, 0, S::npos);
+    test(S("hlbosgmrak"), "hpmsd", 10, 0, S::npos);
+    test(S("pqfhsgilen"), "qnpor", 10, 1, 1);
+    test(S("gqtjsbdckh"), "otdma", 10, 2, 2);
+    test(S("cfkqpjlegi"), "efhjg", 10, 4, 7);
+    test(S("beanrfodgj"), "odpte", 10, 5, 7);
+    test(S("adtkqpbjfi"), "bctdgfmolr", 10, 0, S::npos);
+    test(S("iomkfthagj"), "oaklidrbqg", 10, 1, 1);
+}
+
+template <class S>
+void test2()
+{
+    test(S("sdpcilonqj"), "dnjfsagktr", 10, 5, 9);
+    test(S("gtfbdkqeml"), "nejaktmiqg", 10, 9, 8);
+    test(S("bmeqgcdorj"), "pjqonlebsf", 10, 10, 9);
+    test(S("etqlcanmob"), "dshmnbtolcjepgaikfqr", 10, 0, S::npos);
+    test(S("roqmkbdtia"), "iogfhpabtjkqlrnemcds", 10, 1, 8);
+    test(S("kadsithljf"), "ngridfabjsecpqltkmoh", 10, 10, 9);
+    test(S("sgtkpbfdmh"), "athmknplcgofrqejsdib", 10, 19, 9);
+    test(S("qgmetnabkl"), "ldobhmqcafnjtkeisgrp", 10, 20, 9);
+    test(S("cqjohampgd"), "", 11, 0, S::npos);
+    test(S("hobitmpsan"), "aocjb", 11, 0, S::npos);
+    test(S("tjehkpsalm"), "jbrnk", 11, 1, 1);
+    test(S("ngfbojitcl"), "tqedg", 11, 2, 7);
+    test(S("rcfkdbhgjo"), "nqskp", 11, 4, 3);
+    test(S("qghptonrea"), "eaqkl", 11, 5, 9);
+    test(S("hnprfgqjdl"), "reaoicljqm", 11, 0, S::npos);
+    test(S("hlmgabenti"), "lsftgajqpm", 11, 1, 1);
+    test(S("ofcjanmrbs"), "rlpfogmits", 11, 5, 7);
+    test(S("jqedtkornm"), "shkncmiaqj", 11, 9, 9);
+    test(S("rfedlasjmg"), "fpnatrhqgs", 11, 10, 9);
+    test(S("talpqjsgkm"), "sjclemqhnpdbgikarfot", 11, 0, S::npos);
+    test(S("lrkcbtqpie"), "otcmedjikgsfnqbrhpla", 11, 1, S::npos);
+    test(S("cipogdskjf"), "bonsaefdqiprkhlgtjcm", 11, 10, 9);
+    test(S("nqedcojahi"), "egpscmahijlfnkrodqtb", 11, 19, 9);
+    test(S("hefnrkmctj"), "kmqbfepjthgilscrndoa", 11, 20, 9);
+    test(S("atqirnmekfjolhpdsgcb"), "", 0, 0, S::npos);
+    test(S("echfkmlpribjnqsaogtd"), "prboq", 0, 0, S::npos);
+    test(S("qnhiftdgcleajbpkrosm"), "fjcqh", 0, 1, S::npos);
+    test(S("chamfknorbedjitgslpq"), "fmosa", 0, 2, S::npos);
+    test(S("njhqpibfmtlkaecdrgso"), "qdbok", 0, 4, S::npos);
+    test(S("ebnghfsqkprmdcljoiat"), "amslg", 0, 5, S::npos);
+    test(S("letjomsgihfrpqbkancd"), "smpltjneqb", 0, 0, S::npos);
+    test(S("nblgoipcrqeaktshjdmf"), "flitskrnge", 0, 1, S::npos);
+    test(S("cehkbngtjoiflqapsmrd"), "pgqihmlbef", 0, 5, S::npos);
+    test(S("mignapfoklbhcqjetdrs"), "cfpdqjtgsb", 0, 9, S::npos);
+    test(S("ceatbhlsqjgpnokfrmdi"), "htpsiaflom", 0, 10, S::npos);
+    test(S("ocihkjgrdelpfnmastqb"), "kpjfiaceghsrdtlbnomq", 0, 0, S::npos);
+    test(S("noelgschdtbrjfmiqkap"), "qhtbomidljgafneksprc", 0, 1, S::npos);
+    test(S("dkclqfombepritjnghas"), "nhtjobkcefldimpsaqgr", 0, 10, S::npos);
+    test(S("miklnresdgbhqcojftap"), "prabcjfqnoeskilmtgdh", 0, 19, 0);
+    test(S("htbcigojaqmdkfrnlsep"), "dtrgmchilkasqoebfpjn", 0, 20, 0);
+    test(S("febhmqtjanokscdirpgl"), "", 1, 0, S::npos);
+    test(S("loakbsqjpcrdhftniegm"), "sqome", 1, 0, S::npos);
+    test(S("reagphsqflbitdcjmkno"), "smfte", 1, 1, S::npos);
+    test(S("jitlfrqemsdhkopncabg"), "ciboh", 1, 2, 1);
+    test(S("mhtaepscdnrjqgbkifol"), "haois", 1, 4, 1);
+    test(S("tocesrfmnglpbjihqadk"), "abfki", 1, 5, S::npos);
+    test(S("lpfmctjrhdagneskbqoi"), "frdkocntmq", 1, 0, S::npos);
+    test(S("lsmqaepkdhncirbtjfgo"), "oasbpedlnr", 1, 1, S::npos);
+    test(S("epoiqmtldrabnkjhcfsg"), "kltqmhgand", 1, 5, S::npos);
+    test(S("emgasrilpknqojhtbdcf"), "gdtfjchpmr", 1, 9, 1);
+    test(S("hnfiagdpcklrjetqbsom"), "ponmcqblet", 1, 10, 1);
+    test(S("nsdfebgajhmtricpoklq"), "sgphqdnofeiklatbcmjr", 1, 0, S::npos);
+    test(S("atjgfsdlpobmeiqhncrk"), "ljqprsmigtfoneadckbh", 1, 1, S::npos);
+    test(S("sitodfgnrejlahcbmqkp"), "ligeojhafnkmrcsqtbdp", 1, 10, 1);
+    test(S("fraghmbiceknltjpqosd"), "lsimqfnjarbopedkhcgt", 1, 19, 1);
+    test(S("pmafenlhqtdbkirjsogc"), "abedmfjlghniorcqptks", 1, 20, 1);
+    test(S("pihgmoeqtnakrjslcbfd"), "", 10, 0, S::npos);
+    test(S("gjdkeprctqblnhiafsom"), "hqtoa", 10, 0, S::npos);
+    test(S("mkpnblfdsahrcqijteog"), "cahif", 10, 1, S::npos);
+    test(S("gckarqnelodfjhmbptis"), "kehis", 10, 2, 7);
+    test(S("gqpskidtbclomahnrjfe"), "kdlmh", 10, 4, 10);
+    test(S("pkldjsqrfgitbhmaecno"), "paeql", 10, 5, 6);
+    test(S("aftsijrbeklnmcdqhgop"), "aghoqiefnb", 10, 0, S::npos);
+    test(S("mtlgdrhafjkbiepqnsoc"), "jrbqaikpdo", 10, 1, 9);
+    test(S("pqgirnaefthokdmbsclj"), "smjonaeqcl", 10, 5, 5);
+    test(S("kpdbgjmtherlsfcqoina"), "eqbdrkcfah", 10, 9, 10);
+    test(S("jrlbothiknqmdgcfasep"), "kapmsienhf", 10, 10, 9);
+    test(S("mjogldqferckabinptsh"), "jpqotrlenfcsbhkaimdg", 10, 0, S::npos);
+    test(S("apoklnefbhmgqcdrisjt"), "jlbmhnfgtcqprikeados", 10, 1, S::npos);
+    test(S("ifeopcnrjbhkdgatmqls"), "stgbhfmdaljnpqoicker", 10, 10, 10);
+    test(S("ckqhaiesmjdnrgolbtpf"), "oihcetflbjagdsrkmqpn", 10, 19, 10);
+    test(S("bnlgapfimcoterskqdjh"), "adtclebmnpjsrqfkigoh", 10, 20, 10);
+    test(S("kgdlrobpmjcthqsafeni"), "", 19, 0, S::npos);
+    test(S("dfkechomjapgnslbtqir"), "beafg", 19, 0, S::npos);
+    test(S("rloadknfbqtgmhcsipje"), "iclat", 19, 1, 16);
+    test(S("mgjhkolrnadqbpetcifs"), "rkhnf", 19, 2, 7);
+    test(S("cmlfakiojdrgtbsphqen"), "clshq", 19, 4, 16);
+    test(S("kghbfipeomsntdalrqjc"), "dtcoj", 19, 5, 19);
+    test(S("eldiqckrnmtasbghjfpo"), "rqosnjmfth", 19, 0, S::npos);
+    test(S("abqjcfedgotihlnspkrm"), "siatdfqglh", 19, 1, 15);
+    test(S("qfbadrtjsimkolcenhpg"), "mrlshtpgjq", 19, 5, 17);
+    test(S("abseghclkjqifmtodrnp"), "adlcskgqjt", 19, 9, 16);
+    test(S("ibmsnlrjefhtdokacqpg"), "drshcjknaf", 19, 10, 16);
+    test(S("mrkfciqjebaponsthldg"), "etsaqroinghpkjdlfcbm", 19, 0, S::npos);
+    test(S("mjkticdeoqshpalrfbgn"), "sgepdnkqliambtrocfhj", 19, 1, 10);
+    test(S("rqnoclbdejgiphtfsakm"), "nlmcjaqgbsortfdihkpe", 19, 10, 19);
+    test(S("plkqbhmtfaeodjcrsing"), "racfnpmosldibqkghjet", 19, 19, 19);
+    test(S("oegalhmstjrfickpbndq"), "fjhdsctkqeiolagrnmbp", 19, 20, 19);
+    test(S("rdtgjcaohpblniekmsfq"), "", 20, 0, S::npos);
+    test(S("ofkqbnjetrmsaidphglc"), "ejanp", 20, 0, S::npos);
+    test(S("grkpahljcftesdmonqib"), "odife", 20, 1, 15);
+    test(S("jimlgbhfqkteospardcn"), "okaqd", 20, 2, 12);
+    test(S("gftenihpmslrjkqadcob"), "lcdbi", 20, 4, 19);
+    test(S("bmhldogtckrfsanijepq"), "fsqbj", 20, 5, 19);
+    test(S("nfqkrpjdesabgtlcmoih"), "bigdomnplq", 20, 0, S::npos);
+    test(S("focalnrpiqmdkstehbjg"), "apiblotgcd", 20, 1, 3);
+    test(S("rhqdspkmebiflcotnjga"), "acfhdenops", 20, 5, 19);
+    test(S("rahdtmsckfboqlpniegj"), "jopdeamcrk", 20, 9, 19);
+    test(S("fbkeiopclstmdqranjhg"), "trqncbkgmh", 20, 10, 19);
+    test(S("lifhpdgmbconstjeqark"), "tomglrkencbsfjqpihda", 20, 0, S::npos);
+}
+
+template <class S>
+void test3()
+{
+    test(S("pboqganrhedjmltsicfk"), "gbkhdnpoietfcmrslajq", 20, 1, 4);
+    test(S("klchabsimetjnqgorfpd"), "rtfnmbsglkjaichoqedp", 20, 10, 17);
+    test(S("sirfgmjqhctndbklaepo"), "ohkmdpfqbsacrtjnlgei", 20, 19, 19);
+    test(S("rlbdsiceaonqjtfpghkm"), "dlbrteoisgphmkncajfq", 20, 20, 19);
+    test(S("ecgdanriptblhjfqskom"), "", 21, 0, S::npos);
+    test(S("fdmiarlpgcskbhoteqjn"), "sjrlo", 21, 0, S::npos);
+    test(S("rlbstjqopignecmfadkh"), "qjpor", 21, 1, 6);
+    test(S("grjpqmbshektdolcafni"), "odhfn", 21, 2, 13);
+    test(S("sakfcohtqnibprjmlged"), "qtfin", 21, 4, 10);
+    test(S("mjtdglasihqpocebrfkn"), "hpqfo", 21, 5, 17);
+    test(S("okaplfrntghqbmeicsdj"), "fabmertkos", 21, 0, S::npos);
+    test(S("sahngemrtcjidqbklfpo"), "brqtgkmaej", 21, 1, 14);
+    test(S("dlmsipcnekhbgoaftqjr"), "nfrdeihsgl", 21, 5, 19);
+    test(S("ahegrmqnoiklpfsdbcjt"), "hlfrosekpi", 21, 9, 14);
+    test(S("hdsjbnmlegtkqripacof"), "atgbkrjdsm", 21, 10, 16);
+    test(S("pcnedrfjihqbalkgtoms"), "blnrptjgqmaifsdkhoec", 21, 0, S::npos);
+    test(S("qjidealmtpskrbfhocng"), "ctpmdahebfqjgknloris", 21, 1, 17);
+    test(S("qeindtagmokpfhsclrbj"), "apnkeqthrmlbfodiscgj", 21, 10, 17);
+    test(S("kpfegbjhsrnodltqciam"), "jdgictpframeoqlsbknh", 21, 19, 19);
+    test(S("hnbrcplsjfgiktoedmaq"), "qprlsfojamgndekthibc", 21, 20, 19);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test0<S>();
+    test1<S>();
+    test2<S>();
+    test3<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_last_of( "",      0, 0) == SV::npos, "" );
+    static_assert (sv1.find_last_of( "irkhs", 0, 5) == SV::npos, "" );
+    static_assert (sv2.find_last_of( "",      0, 0) == SV::npos, "" );
+    static_assert (sv2.find_last_of( "gfsrt", 5, 5) == SV::npos, "" );
+    static_assert (sv2.find_last_of( "lecar", 5, 5) == 4, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.find/find_last_of_string_view_size.pass.cpp

@@ -0,0 +1,148 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// size_type find_last_of(const basic_string& str, size_type pos = npos) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type pos, typename S::size_type x)
+{
+    assert(s.find_last_of(str, pos) == x);
+    if (x != S::npos)
+        assert(x <= pos && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type x)
+{
+    assert(s.find_last_of(str) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), S(""), 0, S::npos);
+    test(S(""), S("laenf"), 0, S::npos);
+    test(S(""), S("pqlnkmbdjo"), 0, S::npos);
+    test(S(""), S("qkamfogpnljdcshbreti"), 0, S::npos);
+    test(S(""), S(""), 1, S::npos);
+    test(S(""), S("bjaht"), 1, S::npos);
+    test(S(""), S("hjlcmgpket"), 1, S::npos);
+    test(S(""), S("htaobedqikfplcgjsmrn"), 1, S::npos);
+    test(S("fodgq"), S(""), 0, S::npos);
+    test(S("qanej"), S("dfkap"), 0, S::npos);
+    test(S("clbao"), S("ihqrfebgad"), 0, S::npos);
+    test(S("mekdn"), S("ngtjfcalbseiqrphmkdo"), 0, 0);
+    test(S("srdfq"), S(""), 1, S::npos);
+    test(S("oemth"), S("ikcrq"), 1, S::npos);
+    test(S("cdaih"), S("dmajblfhsg"), 1, 1);
+    test(S("qohtk"), S("oqftjhdmkgsblacenirp"), 1, 1);
+    test(S("cshmd"), S(""), 2, S::npos);
+    test(S("lhcdo"), S("oebqi"), 2, S::npos);
+    test(S("qnsoh"), S("kojhpmbsfe"), 2, 2);
+    test(S("pkrof"), S("acbsjqogpltdkhinfrem"), 2, 2);
+    test(S("fmtsp"), S(""), 4, S::npos);
+    test(S("khbpm"), S("aobjd"), 4, 2);
+    test(S("pbsji"), S("pcbahntsje"), 4, 3);
+    test(S("mprdj"), S("fhepcrntkoagbmldqijs"), 4, 4);
+    test(S("eqmpa"), S(""), 5, S::npos);
+    test(S("omigs"), S("kocgb"), 5, 3);
+    test(S("onmje"), S("fbslrjiqkm"), 5, 3);
+    test(S("oqmrj"), S("jeidpcmalhfnqbgtrsko"), 5, 4);
+    test(S("schfa"), S(""), 6, S::npos);
+    test(S("igdsc"), S("qngpd"), 6, 2);
+    test(S("brqgo"), S("rodhqklgmb"), 6, 4);
+    test(S("tnrph"), S("thdjgafrlbkoiqcspmne"), 6, 4);
+    test(S("hcjitbfapl"), S(""), 0, S::npos);
+    test(S("daiprenocl"), S("ashjd"), 0, 0);
+    test(S("litpcfdghe"), S("mgojkldsqh"), 0, 0);
+    test(S("aidjksrolc"), S("imqnaghkfrdtlopbjesc"), 0, 0);
+    test(S("qpghtfbaji"), S(""), 1, S::npos);
+    test(S("gfshlcmdjr"), S("nadkh"), 1, S::npos);
+    test(S("nkodajteqp"), S("ofdrqmkebl"), 1, 1);
+    test(S("gbmetiprqd"), S("bdfjqgatlksriohemnpc"), 1, 1);
+    test(S("crnklpmegd"), S(""), 5, S::npos);
+    test(S("jsbtafedoc"), S("prqgn"), 5, S::npos);
+    test(S("qnmodrtkeb"), S("pejafmnokr"), 5, 5);
+    test(S("cpebqsfmnj"), S("odnqkgijrhabfmcestlp"), 5, 5);
+    test(S("lmofqdhpki"), S(""), 9, S::npos);
+    test(S("hnefkqimca"), S("rtjpa"), 9, 9);
+    test(S("drtasbgmfp"), S("ktsrmnqagd"), 9, 7);
+    test(S("lsaijeqhtr"), S("rtdhgcisbnmoaqkfpjle"), 9, 9);
+    test(S("elgofjmbrq"), S(""), 10, S::npos);
+    test(S("mjqdgalkpc"), S("dplqa"), 10, 8);
+    test(S("kthqnfcerm"), S("dkacjoptns"), 10, 6);
+    test(S("dfsjhanorc"), S("hqfimtrgnbekpdcsjalo"), 10, 9);
+    test(S("eqsgalomhb"), S(""), 11, S::npos);
+    test(S("akiteljmoh"), S("lofbc"), 11, 8);
+    test(S("hlbdfreqjo"), S("astoegbfpn"), 11, 9);
+    test(S("taqobhlerg"), S("pdgreqomsncafklhtibj"), 11, 9);
+    test(S("snafbdlghrjkpqtoceim"), S(""), 0, S::npos);
+    test(S("aemtbrgcklhndjisfpoq"), S("lbtqd"), 0, S::npos);
+    test(S("pnracgfkjdiholtbqsem"), S("tboimldpjh"), 0, 0);
+    test(S("dicfltehbsgrmojnpkaq"), S("slcerthdaiqjfnobgkpm"), 0, 0);
+    test(S("jlnkraeodhcspfgbqitm"), S(""), 1, S::npos);
+    test(S("lhosrngtmfjikbqpcade"), S("aqibs"), 1, S::npos);
+    test(S("rbtaqjhgkneisldpmfoc"), S("gtfblmqinc"), 1, 1);
+    test(S("gpifsqlrdkbonjtmheca"), S("mkqpbtdalgniorhfescj"), 1, 1);
+    test(S("hdpkobnsalmcfijregtq"), S(""), 10, S::npos);
+    test(S("jtlshdgqaiprkbcoenfm"), S("pblas"), 10, 10);
+    test(S("fkdrbqltsgmcoiphneaj"), S("arosdhcfme"), 10, 10);
+    test(S("crsplifgtqedjohnabmk"), S("blkhjeogicatqfnpdmsr"), 10, 10);
+    test(S("niptglfbosehkamrdqcj"), S(""), 19, S::npos);
+    test(S("copqdhstbingamjfkler"), S("djkqc"), 19, 16);
+    test(S("mrtaefilpdsgocnhqbjk"), S("lgokshjtpb"), 19, 19);
+    test(S("kojatdhlcmigpbfrqnes"), S("bqjhtkfepimcnsgrlado"), 19, 19);
+    test(S("eaintpchlqsbdgrkjofm"), S(""), 20, S::npos);
+    test(S("gjnhidfsepkrtaqbmclo"), S("nocfa"), 20, 19);
+    test(S("spocfaktqdbiejlhngmr"), S("bgtajmiedc"), 20, 18);
+    test(S("rphmlekgfscndtaobiqj"), S("lsckfnqgdahejiopbtmr"), 20, 19);
+    test(S("liatsqdoegkmfcnbhrpj"), S(""), 21, S::npos);
+    test(S("binjagtfldkrspcomqeh"), S("gfsrt"), 21, 12);
+    test(S("latkmisecnorjbfhqpdg"), S("pfsocbhjtm"), 21, 17);
+    test(S("lecfratdjkhnsmqpoigb"), S("tpflmdnoicjgkberhqsa"), 21, 19);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), S(""), S::npos);
+    test(S(""), S("laenf"), S::npos);
+    test(S(""), S("pqlnkmbdjo"), S::npos);
+    test(S(""), S("qkamfogpnljdcshbreti"), S::npos);
+    test(S("nhmko"), S(""), S::npos);
+    test(S("lahfb"), S("irkhs"), 2);
+    test(S("gmfhd"), S("kantesmpgj"), 1);
+    test(S("odaft"), S("oknlrstdpiqmjbaghcfe"), 4);
+    test(S("eolhfgpjqk"), S(""), S::npos);
+    test(S("nbatdlmekr"), S("bnrpe"), 9);
+    test(S("jdmciepkaq"), S("jtdaefblso"), 8);
+    test(S("hkbgspoflt"), S("oselktgbcapndfjihrmq"), 9);
+    test(S("gprdcokbnjhlsfmtieqa"), S(""), S::npos);
+    test(S("qjghlnftcaismkropdeb"), S("bjaht"), 19);
+    test(S("pnalfrdtkqcmojiesbhg"), S("hjlcmgpket"), 19);
+    test(S("pniotcfrhqsmgdkjbael"), S("htaobedqikfplcgjsmrn"), 19);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+}

test/experimental/string.view/string.view.find/find_pointer_size.pass.cpp

@@ -0,0 +1,171 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// constexpr size_type find(const charT* s, size_type pos = 0) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.find(str, pos) == x);
+    if (x != S::npos)
+    {
+        typename S::size_type n = S::traits_type::length(str);
+        assert(pos <= x && x + n <= s.size());
+    }
+}
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type x)
+{
+    assert(s.find(str) == x);
+    if (x != S::npos)
+    {
+        typename S::size_type n = S::traits_type::length(str);
+        assert(0 <= x && x + n <= s.size());
+    }
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, 0);
+    test(S(""), "abcde", 0, S::npos);
+    test(S(""), "abcdeabcde", 0, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, S::npos);
+    test(S(""), "", 1, S::npos);
+    test(S(""), "abcde", 1, S::npos);
+    test(S(""), "abcdeabcde", 1, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, S::npos);
+    test(S("abcde"), "", 0, 0);
+    test(S("abcde"), "abcde", 0, 0);
+    test(S("abcde"), "abcdeabcde", 0, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, S::npos);
+    test(S("abcde"), "", 1, 1);
+    test(S("abcde"), "abcde", 1, S::npos);
+    test(S("abcde"), "abcdeabcde", 1, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, S::npos);
+    test(S("abcde"), "", 2, 2);
+    test(S("abcde"), "abcde", 2, S::npos);
+    test(S("abcde"), "abcdeabcde", 2, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, S::npos);
+    test(S("abcde"), "", 4, 4);
+    test(S("abcde"), "abcde", 4, S::npos);
+    test(S("abcde"), "abcdeabcde", 4, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, S::npos);
+    test(S("abcde"), "", 5, 5);
+    test(S("abcde"), "abcde", 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 5, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, S::npos);
+    test(S("abcde"), "", 6, S::npos);
+    test(S("abcde"), "abcde", 6, S::npos);
+    test(S("abcde"), "abcdeabcde", 6, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, S::npos);
+    test(S("abcdeabcde"), "", 0, 0);
+    test(S("abcdeabcde"), "abcde", 0, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, S::npos);
+    test(S("abcdeabcde"), "", 1, 1);
+    test(S("abcdeabcde"), "abcde", 1, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 1, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, S::npos);
+    test(S("abcdeabcde"), "", 5, 5);
+    test(S("abcdeabcde"), "abcde", 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 5, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, S::npos);
+    test(S("abcdeabcde"), "", 9, 9);
+    test(S("abcdeabcde"), "abcde", 9, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 9, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, S::npos);
+    test(S("abcdeabcde"), "", 10, 10);
+    test(S("abcdeabcde"), "abcde", 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, S::npos);
+    test(S("abcdeabcde"), "", 11, S::npos);
+    test(S("abcdeabcde"), "abcde", 11, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 11, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 1, 1);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 19, 19);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 20, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 21, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), "", 0);
+    test(S(""), "abcde", S::npos);
+    test(S(""), "abcdeabcde", S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", S::npos);
+    test(S("abcde"), "", 0);
+    test(S("abcde"), "abcde", 0);
+    test(S("abcde"), "abcdeabcde", S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", S::npos);
+    test(S("abcdeabcde"), "", 0);
+    test(S("abcdeabcde"), "abcde", 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find( "") == 0, "" );
+    static_assert (sv1.find( "abcde") == SV::npos, "" );
+    static_assert (sv2.find( "") == 0, "" );
+    static_assert (sv2.find( "abcde") == 0, "" );
+    static_assert (sv2.find( "abcde", 1) == SV::npos, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.find/find_pointer_size_size.pass.cpp

@@ -0,0 +1,393 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type find(const charT* s, size_type pos, size_type n) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type n, typename S::size_type x)
+{
+    assert(s.find(str, pos, n) == x);
+    if (x != S::npos)
+        assert(pos <= x && x + n <= s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, 0, 0);
+    test(S(""), "abcde", 0, 0, 0);
+    test(S(""), "abcde", 0, 1, S::npos);
+    test(S(""), "abcde", 0, 2, S::npos);
+    test(S(""), "abcde", 0, 4, S::npos);
+    test(S(""), "abcde", 0, 5, S::npos);
+    test(S(""), "abcdeabcde", 0, 0, 0);
+    test(S(""), "abcdeabcde", 0, 1, S::npos);
+    test(S(""), "abcdeabcde", 0, 5, S::npos);
+    test(S(""), "abcdeabcde", 0, 9, S::npos);
+    test(S(""), "abcdeabcde", 0, 10, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, 0, 0);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, 1, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, 10, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, 19, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, 20, S::npos);
+    test(S(""), "", 1, 0, S::npos);
+    test(S(""), "abcde", 1, 0, S::npos);
+    test(S(""), "abcde", 1, 1, S::npos);
+    test(S(""), "abcde", 1, 2, S::npos);
+    test(S(""), "abcde", 1, 4, S::npos);
+    test(S(""), "abcde", 1, 5, S::npos);
+    test(S(""), "abcdeabcde", 1, 0, S::npos);
+    test(S(""), "abcdeabcde", 1, 1, S::npos);
+    test(S(""), "abcdeabcde", 1, 5, S::npos);
+    test(S(""), "abcdeabcde", 1, 9, S::npos);
+    test(S(""), "abcdeabcde", 1, 10, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, 0, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, 1, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, 10, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, 19, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, 20, S::npos);
+    test(S("abcde"), "", 0, 0, 0);
+    test(S("abcde"), "abcde", 0, 0, 0);
+    test(S("abcde"), "abcde", 0, 1, 0);
+    test(S("abcde"), "abcde", 0, 2, 0);
+    test(S("abcde"), "abcde", 0, 4, 0);
+    test(S("abcde"), "abcde", 0, 5, 0);
+    test(S("abcde"), "abcdeabcde", 0, 0, 0);
+    test(S("abcde"), "abcdeabcde", 0, 1, 0);
+    test(S("abcde"), "abcdeabcde", 0, 5, 0);
+    test(S("abcde"), "abcdeabcde", 0, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 0, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 0, 0);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 1, 0);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 20, S::npos);
+    test(S("abcde"), "", 1, 0, 1);
+    test(S("abcde"), "abcde", 1, 0, 1);
+    test(S("abcde"), "abcde", 1, 1, S::npos);
+    test(S("abcde"), "abcde", 1, 2, S::npos);
+    test(S("abcde"), "abcde", 1, 4, S::npos);
+    test(S("abcde"), "abcde", 1, 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 1, 0, 1);
+    test(S("abcde"), "abcdeabcde", 1, 1, S::npos);
+    test(S("abcde"), "abcdeabcde", 1, 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 1, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 1, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 0, 1);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 1, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 20, S::npos);
+    test(S("abcde"), "", 2, 0, 2);
+    test(S("abcde"), "abcde", 2, 0, 2);
+    test(S("abcde"), "abcde", 2, 1, S::npos);
+    test(S("abcde"), "abcde", 2, 2, S::npos);
+    test(S("abcde"), "abcde", 2, 4, S::npos);
+    test(S("abcde"), "abcde", 2, 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 2, 0, 2);
+    test(S("abcde"), "abcdeabcde", 2, 1, S::npos);
+    test(S("abcde"), "abcdeabcde", 2, 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 2, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 2, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 0, 2);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 1, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 20, S::npos);
+    test(S("abcde"), "", 4, 0, 4);
+    test(S("abcde"), "abcde", 4, 0, 4);
+    test(S("abcde"), "abcde", 4, 1, S::npos);
+    test(S("abcde"), "abcde", 4, 2, S::npos);
+    test(S("abcde"), "abcde", 4, 4, S::npos);
+    test(S("abcde"), "abcde", 4, 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 4, 0, 4);
+    test(S("abcde"), "abcdeabcde", 4, 1, S::npos);
+    test(S("abcde"), "abcdeabcde", 4, 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 4, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 4, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 0, 4);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 1, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 20, S::npos);
+    test(S("abcde"), "", 5, 0, 5);
+    test(S("abcde"), "abcde", 5, 0, 5);
+    test(S("abcde"), "abcde", 5, 1, S::npos);
+    test(S("abcde"), "abcde", 5, 2, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S("abcde"), "abcde", 5, 4, S::npos);
+    test(S("abcde"), "abcde", 5, 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 5, 0, 5);
+    test(S("abcde"), "abcdeabcde", 5, 1, S::npos);
+    test(S("abcde"), "abcdeabcde", 5, 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 5, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 5, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 0, 5);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 1, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 20, S::npos);
+    test(S("abcde"), "", 6, 0, S::npos);
+    test(S("abcde"), "abcde", 6, 0, S::npos);
+    test(S("abcde"), "abcde", 6, 1, S::npos);
+    test(S("abcde"), "abcde", 6, 2, S::npos);
+    test(S("abcde"), "abcde", 6, 4, S::npos);
+    test(S("abcde"), "abcde", 6, 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 6, 0, S::npos);
+    test(S("abcde"), "abcdeabcde", 6, 1, S::npos);
+    test(S("abcde"), "abcdeabcde", 6, 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 6, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 6, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 0, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 1, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 20, S::npos);
+    test(S("abcdeabcde"), "", 0, 0, 0);
+    test(S("abcdeabcde"), "abcde", 0, 0, 0);
+    test(S("abcdeabcde"), "abcde", 0, 1, 0);
+    test(S("abcdeabcde"), "abcde", 0, 2, 0);
+    test(S("abcdeabcde"), "abcde", 0, 4, 0);
+    test(S("abcdeabcde"), "abcde", 0, 5, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 0, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 1, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 5, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 9, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 0, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 1, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 20, S::npos);
+    test(S("abcdeabcde"), "", 1, 0, 1);
+    test(S("abcdeabcde"), "abcde", 1, 0, 1);
+    test(S("abcdeabcde"), "abcde", 1, 1, 5);
+    test(S("abcdeabcde"), "abcde", 1, 2, 5);
+    test(S("abcdeabcde"), "abcde", 1, 4, 5);
+    test(S("abcdeabcde"), "abcde", 1, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 0, 1);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 9, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 0, 1);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 20, S::npos);
+    test(S("abcdeabcde"), "", 5, 0, 5);
+    test(S("abcdeabcde"), "abcde", 5, 0, 5);
+    test(S("abcdeabcde"), "abcde", 5, 1, 5);
+    test(S("abcdeabcde"), "abcde", 5, 2, 5);
+    test(S("abcdeabcde"), "abcde", 5, 4, 5);
+    test(S("abcdeabcde"), "abcde", 5, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 0, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 9, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 0, 5);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 20, S::npos);
+    test(S("abcdeabcde"), "", 9, 0, 9);
+    test(S("abcdeabcde"), "abcde", 9, 0, 9);
+    test(S("abcdeabcde"), "abcde", 9, 1, S::npos);
+    test(S("abcdeabcde"), "abcde", 9, 2, S::npos);
+    test(S("abcdeabcde"), "abcde", 9, 4, S::npos);
+    test(S("abcdeabcde"), "abcde", 9, 5, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 0, 9);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 1, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 5, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 9, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 0, 9);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 1, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 20, S::npos);
+    test(S("abcdeabcde"), "", 10, 0, 10);
+    test(S("abcdeabcde"), "abcde", 10, 0, 10);
+    test(S("abcdeabcde"), "abcde", 10, 1, S::npos);
+    test(S("abcdeabcde"), "abcde", 10, 2, S::npos);
+    test(S("abcdeabcde"), "abcde", 10, 4, S::npos);
+    test(S("abcdeabcde"), "abcde", 10, 5, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 10, 0, 10);
+    test(S("abcdeabcde"), "abcdeabcde", 10, 1, S::npos);
+}
+
+template <class S>
+void test2()
+{
+    test(S("abcdeabcde"), "abcdeabcde", 10, 5, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 10, 9, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 10, 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 0, 10);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 1, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 20, S::npos);
+    test(S("abcdeabcde"), "", 11, 0, S::npos);
+    test(S("abcdeabcde"), "abcde", 11, 0, S::npos);
+    test(S("abcdeabcde"), "abcde", 11, 1, S::npos);
+    test(S("abcdeabcde"), "abcde", 11, 2, S::npos);
+    test(S("abcdeabcde"), "abcde", 11, 4, S::npos);
+    test(S("abcdeabcde"), "abcde", 11, 5, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 0, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 1, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 5, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 9, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 0, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 1, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 0, 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 2, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 4, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 5, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 5, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 9, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 10, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 10, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 19, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 20, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 1, 0, 1);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 0, 1);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 1, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 2, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 4, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 5, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 0, 1);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 1, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 5, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 9, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 10, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 0, 1);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 1, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 10, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 10, 0, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 0, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 1, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 2, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 4, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 5, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 0, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 1, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 5, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 9, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 0, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 1, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 19, 0, 19);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 0, 19);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 2, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 4, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 5, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 0, 19);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 5, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 9, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 10, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 0, 19);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 10, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 20, 0, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 0, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 2, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 4, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 5, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 0, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 5, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 9, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 10, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 0, 20);
+}
+
+template <class S>
+void test3()
+{
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 10, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 21, 0, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 0, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 2, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 4, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 5, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 0, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 5, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 9, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 10, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 0, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 10, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 20, S::npos);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test0<S>();
+    test1<S>();
+    test2<S>();
+    test3<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find( "",      0, 0 ) == 0, "" );
+    static_assert (sv1.find( "abcde", 0, 0 ) == 0, "" );
+    static_assert (sv1.find( "abcde", 0, 1 ) == SV::npos, "" );
+    static_assert (sv2.find( "",      0, 0 ) == 0, "" );
+    static_assert (sv2.find( "abcde", 0, 0 ) == 0, "" );
+    static_assert (sv2.find( "abcde", 0, 1 ) == 0, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.find/find_string_view_size.pass.cpp

@@ -0,0 +1,164 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type find(const basic_string_view& str, size_type pos = 0) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type pos, typename S::size_type x)
+{
+    assert(s.find(str, pos) == x);
+    if (x != S::npos)
+        assert(pos <= x && x + str.size() <= s.size());
+}
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type x)
+{
+    assert(s.find(str) == x);
+    if (x != S::npos)
+        assert(0 <= x && x + str.size() <= s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), S(""), 0, 0);
+    test(S(""), S("abcde"), 0, S::npos);
+    test(S(""), S("abcdeabcde"), 0, S::npos);
+    test(S(""), S("abcdeabcdeabcdeabcde"), 0, S::npos);
+    test(S(""), S(""), 1, S::npos);
+    test(S(""), S("abcde"), 1, S::npos);
+    test(S(""), S("abcdeabcde"), 1, S::npos);
+    test(S(""), S("abcdeabcdeabcdeabcde"), 1, S::npos);
+    test(S("abcde"), S(""), 0, 0);
+    test(S("abcde"), S("abcde"), 0, 0);
+    test(S("abcde"), S("abcdeabcde"), 0, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 0, S::npos);
+    test(S("abcde"), S(""), 1, 1);
+    test(S("abcde"), S("abcde"), 1, S::npos);
+    test(S("abcde"), S("abcdeabcde"), 1, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 1, S::npos);
+    test(S("abcde"), S(""), 2, 2);
+    test(S("abcde"), S("abcde"), 2, S::npos);
+    test(S("abcde"), S("abcdeabcde"), 2, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 2, S::npos);
+    test(S("abcde"), S(""), 4, 4);
+    test(S("abcde"), S("abcde"), 4, S::npos);
+    test(S("abcde"), S("abcdeabcde"), 4, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 4, S::npos);
+    test(S("abcde"), S(""), 5, 5);
+    test(S("abcde"), S("abcde"), 5, S::npos);
+    test(S("abcde"), S("abcdeabcde"), 5, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 5, S::npos);
+    test(S("abcde"), S(""), 6, S::npos);
+    test(S("abcde"), S("abcde"), 6, S::npos);
+    test(S("abcde"), S("abcdeabcde"), 6, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 6, S::npos);
+    test(S("abcdeabcde"), S(""), 0, 0);
+    test(S("abcdeabcde"), S("abcde"), 0, 0);
+    test(S("abcdeabcde"), S("abcdeabcde"), 0, 0);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 0, S::npos);
+    test(S("abcdeabcde"), S(""), 1, 1);
+    test(S("abcdeabcde"), S("abcde"), 1, 5);
+    test(S("abcdeabcde"), S("abcdeabcde"), 1, S::npos);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 1, S::npos);
+    test(S("abcdeabcde"), S(""), 5, 5);
+    test(S("abcdeabcde"), S("abcde"), 5, 5);
+    test(S("abcdeabcde"), S("abcdeabcde"), 5, S::npos);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 5, S::npos);
+    test(S("abcdeabcde"), S(""), 9, 9);
+    test(S("abcdeabcde"), S("abcde"), 9, S::npos);
+    test(S("abcdeabcde"), S("abcdeabcde"), 9, S::npos);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 9, S::npos);
+    test(S("abcdeabcde"), S(""), 10, 10);
+    test(S("abcdeabcde"), S("abcde"), 10, S::npos);
+    test(S("abcdeabcde"), S("abcdeabcde"), 10, S::npos);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 10, S::npos);
+    test(S("abcdeabcde"), S(""), 11, S::npos);
+    test(S("abcdeabcde"), S("abcde"), 11, S::npos);
+    test(S("abcdeabcde"), S("abcdeabcde"), 11, S::npos);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 11, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 1, 1);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 1, 5);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 1, 5);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 10, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 19, 19);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 20, 20);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 21, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 21, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 21, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 21, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), S(""), 0);
+    test(S(""), S("abcde"), S::npos);
+    test(S(""), S("abcdeabcde"), S::npos);
+    test(S(""), S("abcdeabcdeabcdeabcde"), S::npos);
+    test(S("abcde"), S(""), 0);
+    test(S("abcde"), S("abcde"), 0);
+    test(S("abcde"), S("abcdeabcde"), S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), S::npos);
+    test(S("abcdeabcde"), S(""), 0);
+    test(S("abcdeabcde"), S("abcde"), 0);
+    test(S("abcdeabcde"), S("abcdeabcde"), 0);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 0);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find(sv1) == 0, "" );
+    static_assert (sv1.find(sv2) == SV::npos, "" );
+    static_assert (sv2.find(sv1) == 0, "" );
+    static_assert (sv2.find(sv2) == 0, "" );
+    static_assert (sv2.find(sv2, 1 ) == SV::npos, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.find/rfind_char_size.pass.cpp

@@ -0,0 +1,83 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+// constexpr size_type rfind(charT c, size_type pos = npos) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.rfind(c, pos) == x);
+    if (x != S::npos)
+        assert(x <= pos && x + 1 <= s.size());
+}
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type x)
+{
+    assert(s.rfind(c) == x);
+    if (x != S::npos)
+        assert(x + 1 <= s.size());
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test(S(""), 'b', 0, S::npos);
+    test(S(""), 'b', 1, S::npos);
+    test(S("abcde"), 'b', 0, S::npos);
+    test(S("abcde"), 'b', 1, 1);
+    test(S("abcde"), 'b', 2, 1);
+    test(S("abcde"), 'b', 4, 1);
+    test(S("abcde"), 'b', 5, 1);
+    test(S("abcde"), 'b', 6, 1);
+    test(S("abcdeabcde"), 'b', 0, S::npos);
+    test(S("abcdeabcde"), 'b', 1, 1);
+    test(S("abcdeabcde"), 'b', 5, 1);
+    test(S("abcdeabcde"), 'b', 9, 6);
+    test(S("abcdeabcde"), 'b', 10, 6);
+    test(S("abcdeabcde"), 'b', 11, 6);
+    test(S("abcdeabcdeabcdeabcde"), 'b', 0, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), 'b', 1, 1);
+    test(S("abcdeabcdeabcdeabcde"), 'b', 10, 6);
+    test(S("abcdeabcdeabcdeabcde"), 'b', 19, 16);
+    test(S("abcdeabcdeabcdeabcde"), 'b', 20, 16);
+    test(S("abcdeabcdeabcdeabcde"), 'b', 21, 16);
+
+    test(S(""), 'b', S::npos);
+    test(S("abcde"), 'b', 1);
+    test(S("abcdeabcde"), 'b', 6);
+    test(S("abcdeabcdeabcdeabcde"), 'b', 16);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.rfind( 'b', 0 ) == SV::npos, "" );
+    static_assert (sv1.rfind( 'b', 1 ) == SV::npos, "" );
+    static_assert (sv2.rfind( 'b', 0 ) == SV::npos, "" );
+    static_assert (sv2.rfind( 'b', 1 ) == 1, "" );
+    static_assert (sv2.rfind( 'b', 2 ) == 1, "" );
+    static_assert (sv2.rfind( 'b', 3 ) == 1, "" );
+    static_assert (sv2.rfind( 'b', 4 ) == 1, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.find/rfind_pointer_size.pass.cpp

@@ -0,0 +1,171 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+// constexpr size_type rfind(const charT* s, size_type pos = npos) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.rfind(str, pos) == x);
+    if (x != S::npos)
+    {
+        typename S::size_type n = S::traits_type::length(str);
+        assert(x <= pos && x + n <= s.size());
+    }
+}
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type x)
+{
+    assert(s.rfind(str) == x);
+    if (x != S::npos)
+    {
+        typename S::size_type pos = s.size();
+        typename S::size_type n = S::traits_type::length(str);
+        assert(x <= pos && x + n <= s.size());
+    }
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, 0);
+    test(S(""), "abcde", 0, S::npos);
+    test(S(""), "abcdeabcde", 0, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, S::npos);
+    test(S(""), "", 1, 0);
+    test(S(""), "abcde", 1, S::npos);
+    test(S(""), "abcdeabcde", 1, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, S::npos);
+    test(S("abcde"), "", 0, 0);
+    test(S("abcde"), "abcde", 0, 0);
+    test(S("abcde"), "abcdeabcde", 0, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, S::npos);
+    test(S("abcde"), "", 1, 1);
+    test(S("abcde"), "abcde", 1, 0);
+    test(S("abcde"), "abcdeabcde", 1, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, S::npos);
+    test(S("abcde"), "", 2, 2);
+    test(S("abcde"), "abcde", 2, 0);
+    test(S("abcde"), "abcdeabcde", 2, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, S::npos);
+    test(S("abcde"), "", 4, 4);
+    test(S("abcde"), "abcde", 4, 0);
+    test(S("abcde"), "abcdeabcde", 4, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, S::npos);
+    test(S("abcde"), "", 5, 5);
+    test(S("abcde"), "abcde", 5, 0);
+    test(S("abcde"), "abcdeabcde", 5, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, S::npos);
+    test(S("abcde"), "", 6, 5);
+    test(S("abcde"), "abcde", 6, 0);
+    test(S("abcde"), "abcdeabcde", 6, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, S::npos);
+    test(S("abcdeabcde"), "", 0, 0);
+    test(S("abcdeabcde"), "abcde", 0, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, S::npos);
+    test(S("abcdeabcde"), "", 1, 1);
+    test(S("abcdeabcde"), "abcde", 1, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, S::npos);
+    test(S("abcdeabcde"), "", 5, 5);
+    test(S("abcdeabcde"), "abcde", 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, S::npos);
+    test(S("abcdeabcde"), "", 9, 9);
+    test(S("abcdeabcde"), "abcde", 9, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, S::npos);
+    test(S("abcdeabcde"), "", 10, 10);
+    test(S("abcdeabcde"), "abcde", 10, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, S::npos);
+    test(S("abcdeabcde"), "", 11, 10);
+    test(S("abcdeabcde"), "abcde", 11, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 1, 1);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 19, 19);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 20, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 21, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 0);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), "", 0);
+    test(S(""), "abcde", S::npos);
+    test(S(""), "abcdeabcde", S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", S::npos);
+    test(S("abcde"), "", 5);
+    test(S("abcde"), "abcde", 0);
+    test(S("abcde"), "abcdeabcde", S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", S::npos);
+    test(S("abcdeabcde"), "", 10);
+    test(S("abcdeabcde"), "abcde", 5);
+    test(S("abcdeabcde"), "abcdeabcde", 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.rfind( "") == 0, "" );
+    static_assert (sv1.rfind( "abcde") == SV::npos, "" );
+    static_assert (sv2.rfind( "") == 5, "" );
+    static_assert (sv2.rfind( "abcde") == 0, "" );
+    static_assert (sv2.rfind( "abcde", 1) == 0, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.find/rfind_pointer_size_size.pass.cpp

@@ -0,0 +1,392 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+// constexpr size_type rfind(const charT* s, size_type pos, size_type n) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+      typename S::size_type n, typename S::size_type x)
+{
+    assert(s.rfind(str, pos, n) == x);
+    if (x != S::npos)
+        assert(x <= pos && x + n <= s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, 0, 0);
+    test(S(""), "abcde", 0, 0, 0);
+    test(S(""), "abcde", 0, 1, S::npos);
+    test(S(""), "abcde", 0, 2, S::npos);
+    test(S(""), "abcde", 0, 4, S::npos);
+    test(S(""), "abcde", 0, 5, S::npos);
+    test(S(""), "abcdeabcde", 0, 0, 0);
+    test(S(""), "abcdeabcde", 0, 1, S::npos);
+    test(S(""), "abcdeabcde", 0, 5, S::npos);
+    test(S(""), "abcdeabcde", 0, 9, S::npos);
+    test(S(""), "abcdeabcde", 0, 10, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, 0, 0);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, 1, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, 10, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, 19, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, 20, S::npos);
+    test(S(""), "", 1, 0, 0);
+    test(S(""), "abcde", 1, 0, 0);
+    test(S(""), "abcde", 1, 1, S::npos);
+    test(S(""), "abcde", 1, 2, S::npos);
+    test(S(""), "abcde", 1, 4, S::npos);
+    test(S(""), "abcde", 1, 5, S::npos);
+    test(S(""), "abcdeabcde", 1, 0, 0);
+    test(S(""), "abcdeabcde", 1, 1, S::npos);
+    test(S(""), "abcdeabcde", 1, 5, S::npos);
+    test(S(""), "abcdeabcde", 1, 9, S::npos);
+    test(S(""), "abcdeabcde", 1, 10, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, 0, 0);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, 1, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, 10, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, 19, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, 20, S::npos);
+    test(S("abcde"), "", 0, 0, 0);
+    test(S("abcde"), "abcde", 0, 0, 0);
+    test(S("abcde"), "abcde", 0, 1, 0);
+    test(S("abcde"), "abcde", 0, 2, 0);
+    test(S("abcde"), "abcde", 0, 4, 0);
+    test(S("abcde"), "abcde", 0, 5, 0);
+    test(S("abcde"), "abcdeabcde", 0, 0, 0);
+    test(S("abcde"), "abcdeabcde", 0, 1, 0);
+    test(S("abcde"), "abcdeabcde", 0, 5, 0);
+    test(S("abcde"), "abcdeabcde", 0, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 0, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 0, 0);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 1, 0);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 20, S::npos);
+    test(S("abcde"), "", 1, 0, 1);
+    test(S("abcde"), "abcde", 1, 0, 1);
+    test(S("abcde"), "abcde", 1, 1, 0);
+    test(S("abcde"), "abcde", 1, 2, 0);
+    test(S("abcde"), "abcde", 1, 4, 0);
+    test(S("abcde"), "abcde", 1, 5, 0);
+    test(S("abcde"), "abcdeabcde", 1, 0, 1);
+    test(S("abcde"), "abcdeabcde", 1, 1, 0);
+    test(S("abcde"), "abcdeabcde", 1, 5, 0);
+    test(S("abcde"), "abcdeabcde", 1, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 1, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 0, 1);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 1, 0);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 20, S::npos);
+    test(S("abcde"), "", 2, 0, 2);
+    test(S("abcde"), "abcde", 2, 0, 2);
+    test(S("abcde"), "abcde", 2, 1, 0);
+    test(S("abcde"), "abcde", 2, 2, 0);
+    test(S("abcde"), "abcde", 2, 4, 0);
+    test(S("abcde"), "abcde", 2, 5, 0);
+    test(S("abcde"), "abcdeabcde", 2, 0, 2);
+    test(S("abcde"), "abcdeabcde", 2, 1, 0);
+    test(S("abcde"), "abcdeabcde", 2, 5, 0);
+    test(S("abcde"), "abcdeabcde", 2, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 2, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 0, 2);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 1, 0);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 20, S::npos);
+    test(S("abcde"), "", 4, 0, 4);
+    test(S("abcde"), "abcde", 4, 0, 4);
+    test(S("abcde"), "abcde", 4, 1, 0);
+    test(S("abcde"), "abcde", 4, 2, 0);
+    test(S("abcde"), "abcde", 4, 4, 0);
+    test(S("abcde"), "abcde", 4, 5, 0);
+    test(S("abcde"), "abcdeabcde", 4, 0, 4);
+    test(S("abcde"), "abcdeabcde", 4, 1, 0);
+    test(S("abcde"), "abcdeabcde", 4, 5, 0);
+    test(S("abcde"), "abcdeabcde", 4, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 4, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 0, 4);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 1, 0);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 20, S::npos);
+    test(S("abcde"), "", 5, 0, 5);
+    test(S("abcde"), "abcde", 5, 0, 5);
+    test(S("abcde"), "abcde", 5, 1, 0);
+    test(S("abcde"), "abcde", 5, 2, 0);
+}
+
+template <class S>
+void test1()
+{
+    test(S("abcde"), "abcde", 5, 4, 0);
+    test(S("abcde"), "abcde", 5, 5, 0);
+    test(S("abcde"), "abcdeabcde", 5, 0, 5);
+    test(S("abcde"), "abcdeabcde", 5, 1, 0);
+    test(S("abcde"), "abcdeabcde", 5, 5, 0);
+    test(S("abcde"), "abcdeabcde", 5, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 5, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 0, 5);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 1, 0);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 20, S::npos);
+    test(S("abcde"), "", 6, 0, 5);
+    test(S("abcde"), "abcde", 6, 0, 5);
+    test(S("abcde"), "abcde", 6, 1, 0);
+    test(S("abcde"), "abcde", 6, 2, 0);
+    test(S("abcde"), "abcde", 6, 4, 0);
+    test(S("abcde"), "abcde", 6, 5, 0);
+    test(S("abcde"), "abcdeabcde", 6, 0, 5);
+    test(S("abcde"), "abcdeabcde", 6, 1, 0);
+    test(S("abcde"), "abcdeabcde", 6, 5, 0);
+    test(S("abcde"), "abcdeabcde", 6, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 6, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 0, 5);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 1, 0);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 20, S::npos);
+    test(S("abcdeabcde"), "", 0, 0, 0);
+    test(S("abcdeabcde"), "abcde", 0, 0, 0);
+    test(S("abcdeabcde"), "abcde", 0, 1, 0);
+    test(S("abcdeabcde"), "abcde", 0, 2, 0);
+    test(S("abcdeabcde"), "abcde", 0, 4, 0);
+    test(S("abcdeabcde"), "abcde", 0, 5, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 0, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 1, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 5, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 9, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 0, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 1, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 20, S::npos);
+    test(S("abcdeabcde"), "", 1, 0, 1);
+    test(S("abcdeabcde"), "abcde", 1, 0, 1);
+    test(S("abcdeabcde"), "abcde", 1, 1, 0);
+    test(S("abcdeabcde"), "abcde", 1, 2, 0);
+    test(S("abcdeabcde"), "abcde", 1, 4, 0);
+    test(S("abcdeabcde"), "abcde", 1, 5, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 0, 1);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 1, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 5, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 9, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 0, 1);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 1, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 20, S::npos);
+    test(S("abcdeabcde"), "", 5, 0, 5);
+    test(S("abcdeabcde"), "abcde", 5, 0, 5);
+    test(S("abcdeabcde"), "abcde", 5, 1, 5);
+    test(S("abcdeabcde"), "abcde", 5, 2, 5);
+    test(S("abcdeabcde"), "abcde", 5, 4, 5);
+    test(S("abcdeabcde"), "abcde", 5, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 0, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 9, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 0, 5);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 20, S::npos);
+    test(S("abcdeabcde"), "", 9, 0, 9);
+    test(S("abcdeabcde"), "abcde", 9, 0, 9);
+    test(S("abcdeabcde"), "abcde", 9, 1, 5);
+    test(S("abcdeabcde"), "abcde", 9, 2, 5);
+    test(S("abcdeabcde"), "abcde", 9, 4, 5);
+    test(S("abcdeabcde"), "abcde", 9, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 0, 9);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 9, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 0, 9);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 20, S::npos);
+    test(S("abcdeabcde"), "", 10, 0, 10);
+    test(S("abcdeabcde"), "abcde", 10, 0, 10);
+    test(S("abcdeabcde"), "abcde", 10, 1, 5);
+    test(S("abcdeabcde"), "abcde", 10, 2, 5);
+    test(S("abcdeabcde"), "abcde", 10, 4, 5);
+    test(S("abcdeabcde"), "abcde", 10, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 10, 0, 10);
+    test(S("abcdeabcde"), "abcdeabcde", 10, 1, 5);
+}
+
+template <class S>
+void test2()
+{
+    test(S("abcdeabcde"), "abcdeabcde", 10, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 10, 9, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 10, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 0, 10);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 20, S::npos);
+    test(S("abcdeabcde"), "", 11, 0, 10);
+    test(S("abcdeabcde"), "abcde", 11, 0, 10);
+    test(S("abcdeabcde"), "abcde", 11, 1, 5);
+    test(S("abcdeabcde"), "abcde", 11, 2, 5);
+    test(S("abcdeabcde"), "abcde", 11, 4, 5);
+    test(S("abcdeabcde"), "abcde", 11, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 0, 10);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 9, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 0, 10);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 0, 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 2, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 4, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 5, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 5, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 9, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 10, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 10, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 19, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 20, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 1, 0, 1);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 0, 1);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 2, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 4, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 5, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 0, 1);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 5, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 9, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 10, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 0, 1);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 10, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 19, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 20, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 10, 0, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 0, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 1, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 2, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 4, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 5, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 0, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 1, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 5, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 9, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 0, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 1, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 19, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 20, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 19, 0, 19);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 0, 19);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 1, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 2, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 4, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 5, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 0, 19);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 1, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 5, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 9, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 0, 19);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 1, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 19, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 20, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 20, 0, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 0, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 1, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 2, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 4, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 5, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 0, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 1, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 5, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 9, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 0, 20);
+}
+
+template <class S>
+void test3()
+{
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 1, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 19, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 20, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 21, 0, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 0, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 1, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 2, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 4, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 5, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 0, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 1, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 5, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 9, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 0, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 1, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 19, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 20, 0);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test0<S>();
+    test1<S>();
+    test2<S>();
+    test3<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.rfind( "",      0, 0 ) == 0, "" );
+    static_assert (sv1.rfind( "abcde", 0, 0 ) == 0, "" );
+    static_assert (sv1.rfind( "abcde", 0, 1 ) == SV::npos, "" );
+    static_assert (sv2.rfind( "",      0, 0 ) == 0, "" );
+    static_assert (sv2.rfind( "abcde", 0, 0 ) == 0, "" );
+    static_assert (sv2.rfind( "abcde", 0, 1 ) == 0, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.find/rfind_string_view_size.pass.cpp

@@ -0,0 +1,164 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type rfind(const basic_string& str, size_type pos = npos) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type pos, typename S::size_type x)
+{
+    assert(s.rfind(str, pos) == x);
+    if (x != S::npos)
+        assert(x <= pos && x + str.size() <= s.size());
+}
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type x)
+{
+    assert(s.rfind(str) == x);
+    if (x != S::npos)
+        assert(0 <= x && x + str.size() <= s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), S(""), 0, 0);
+    test(S(""), S("abcde"), 0, S::npos);
+    test(S(""), S("abcdeabcde"), 0, S::npos);
+    test(S(""), S("abcdeabcdeabcdeabcde"), 0, S::npos);
+    test(S(""), S(""), 1, 0);
+    test(S(""), S("abcde"), 1, S::npos);
+    test(S(""), S("abcdeabcde"), 1, S::npos);
+    test(S(""), S("abcdeabcdeabcdeabcde"), 1, S::npos);
+    test(S("abcde"), S(""), 0, 0);
+    test(S("abcde"), S("abcde"), 0, 0);
+    test(S("abcde"), S("abcdeabcde"), 0, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 0, S::npos);
+    test(S("abcde"), S(""), 1, 1);
+    test(S("abcde"), S("abcde"), 1, 0);
+    test(S("abcde"), S("abcdeabcde"), 1, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 1, S::npos);
+    test(S("abcde"), S(""), 2, 2);
+    test(S("abcde"), S("abcde"), 2, 0);
+    test(S("abcde"), S("abcdeabcde"), 2, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 2, S::npos);
+    test(S("abcde"), S(""), 4, 4);
+    test(S("abcde"), S("abcde"), 4, 0);
+    test(S("abcde"), S("abcdeabcde"), 4, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 4, S::npos);
+    test(S("abcde"), S(""), 5, 5);
+    test(S("abcde"), S("abcde"), 5, 0);
+    test(S("abcde"), S("abcdeabcde"), 5, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 5, S::npos);
+    test(S("abcde"), S(""), 6, 5);
+    test(S("abcde"), S("abcde"), 6, 0);
+    test(S("abcde"), S("abcdeabcde"), 6, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 6, S::npos);
+    test(S("abcdeabcde"), S(""), 0, 0);
+    test(S("abcdeabcde"), S("abcde"), 0, 0);
+    test(S("abcdeabcde"), S("abcdeabcde"), 0, 0);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 0, S::npos);
+    test(S("abcdeabcde"), S(""), 1, 1);
+    test(S("abcdeabcde"), S("abcde"), 1, 0);
+    test(S("abcdeabcde"), S("abcdeabcde"), 1, 0);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 1, S::npos);
+    test(S("abcdeabcde"), S(""), 5, 5);
+    test(S("abcdeabcde"), S("abcde"), 5, 5);
+    test(S("abcdeabcde"), S("abcdeabcde"), 5, 0);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 5, S::npos);
+    test(S("abcdeabcde"), S(""), 9, 9);
+    test(S("abcdeabcde"), S("abcde"), 9, 5);
+    test(S("abcdeabcde"), S("abcdeabcde"), 9, 0);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 9, S::npos);
+    test(S("abcdeabcde"), S(""), 10, 10);
+    test(S("abcdeabcde"), S("abcde"), 10, 5);
+    test(S("abcdeabcde"), S("abcdeabcde"), 10, 0);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 10, S::npos);
+    test(S("abcdeabcde"), S(""), 11, 10);
+    test(S("abcdeabcde"), S("abcde"), 11, 5);
+    test(S("abcdeabcde"), S("abcdeabcde"), 11, 0);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 11, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 1, 1);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 10, 0);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 19, 19);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 19, 15);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 19, 10);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 19, 0);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 20, 20);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 20, 15);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 20, 10);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 20, 0);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 21, 20);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 21, 15);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 21, 10);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 21, 0);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), S(""), 0);
+    test(S(""), S("abcde"), S::npos);
+    test(S(""), S("abcdeabcde"), S::npos);
+    test(S(""), S("abcdeabcdeabcdeabcde"), S::npos);
+    test(S("abcde"), S(""), 5);
+    test(S("abcde"), S("abcde"), 0);
+    test(S("abcde"), S("abcdeabcde"), S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), S::npos);
+    test(S("abcdeabcde"), S(""), 10);
+    test(S("abcdeabcde"), S("abcde"), 5);
+    test(S("abcdeabcde"), S("abcdeabcde"), 0);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 20);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 15);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 10);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 0);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.rfind(sv1) == 0, "" );
+    static_assert (sv1.rfind(sv2) == SV::npos, "" );
+    static_assert (sv2.rfind(sv1) == 5, "" );
+    static_assert (sv2.rfind(sv2) == 0, "" );
+    static_assert (sv2.rfind(sv2, 1) == 0, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.hash/string_view.pass.cpp

@@ -0,0 +1,55 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <functional>
+
+// template <class T>
+// struct hash
+//     : public unary_function<T, size_t>
+// {
+//     size_t operator()(T val) const;
+// };
+
+// Not very portable
+
+#include <experimental/string_view>
+#include <cassert>
+#include <type_traits>
+
+using std::experimental::string_view;
+
+template <class T>
+void
+test()
+{
+    typedef std::hash<T> H;
+    static_assert((std::is_base_of<std::unary_function<T, std::size_t>,
+                                   H>::value), "");
+    H h;
+//     std::string g1 = "1234567890";
+//     std::string g2 = "1234567891";
+    typedef typename T::value_type char_type;
+    char_type g1 [ 10 ];
+    char_type g2 [ 10 ];
+    for ( int i = 0; i < 10; ++i )
+        g1[i] = g2[9-i] = '0' + i;
+    T s1(g1, 10);
+    T s2(g2, 10);
+    assert(h(s1) != h(s2));
+}
+
+int main()
+{
+    test<std::experimental::string_view>();
+#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
+    test<std::experimental::u16string_view>();
+    test<std::experimental::u32string_view>();
+#endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+    test<std::experimental::wstring_view>();
+}

test/experimental/string.view/string.view.io/stream_insert.pass.cpp

@@ -0,0 +1,58 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   basic_ostream<charT, traits>&
+//   operator<<(basic_ostream<charT, traits>& os,
+//              const basic_string_view<charT,traits> str);
+
+#include <experimental/string_view>
+#include <sstream>
+#include <cassert>
+
+using std::experimental::string_view;
+using std::experimental::wstring_view;
+
+int main()
+{
+    {
+        std::ostringstream out;
+        string_view sv("some text");
+        out << sv;
+        assert(out.good());
+        assert(sv == out.str());
+    }
+    {
+        std::ostringstream out;
+        std::string s("some text");
+        string_view sv(s);
+        out.width(12);
+        out << sv;
+        assert(out.good());
+        assert("   " + s == out.str());
+    }
+    {
+        std::wostringstream out;
+        wstring_view sv(L"some text");
+        out << sv;
+        assert(out.good());
+        assert(sv == out.str());
+    }
+    {
+        std::wostringstream out;
+        std::wstring s(L"some text");
+        wstring_view sv(s);
+        out.width(12);
+        out << sv;
+        assert(out.good());
+        assert(L"   " + s == out.str());
+    }
+}

test/experimental/string.view/string.view.iterators/begin.pass.cpp

@@ -0,0 +1,77 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr const_iterator begin() const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+template <class S>
+void
+test(S s)
+{
+    const S& cs = s;
+    typename S::iterator b = s.begin();
+    typename S::const_iterator cb1 = cs.begin();
+    typename S::const_iterator cb2 = s.cbegin();
+    if (!s.empty())
+    {
+        assert(   *b ==  s[0]);
+        assert(  &*b == &s[0]);
+        assert( *cb1 ==  s[0]);
+        assert(&*cb1 == &s[0]);
+        assert( *cb2 ==  s[0]);
+        assert(&*cb2 == &s[0]);
+        
+    }
+    assert(  b == cb1);
+    assert(  b == cb2);
+    assert(cb1 == cb2);
+}
+
+
+int main()
+{
+    using string_view    = std::experimental::string_view;
+    using u16string_view = std::experimental::u16string_view;
+    using u32string_view = std::experimental::u32string_view;
+    using wstring_view   = std::experimental::wstring_view;
+
+    test(string_view   ());
+    test(u16string_view());
+    test(u32string_view());
+    test(wstring_view  ());
+    test(string_view   ( "123"));
+    test(wstring_view  (L"123"));
+#if __cplusplus >= 201103L
+    test(u16string_view{u"123"});
+    test(u32string_view{U"123"});
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr string_view       sv { "123", 3 };
+    constexpr u16string_view u16sv {u"123", 3 };
+    constexpr u32string_view u32sv {U"123", 3 };
+    constexpr wstring_view     wsv {L"123", 3 };
+    
+    static_assert (    *sv.begin() ==    sv[0], "" );
+    static_assert ( *u16sv.begin() == u16sv[0], "" );
+    static_assert ( *u32sv.begin() == u32sv[0], "" );
+    static_assert (   *wsv.begin() ==   wsv[0], "" );
+
+    static_assert (    *sv.cbegin() ==    sv[0], "" );
+    static_assert ( *u16sv.cbegin() == u16sv[0], "" );
+    static_assert ( *u32sv.cbegin() == u32sv[0], "" );
+    static_assert (   *wsv.cbegin() ==   wsv[0], "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.iterators/end.pass.cpp

@@ -0,0 +1,85 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr const_iterator end() const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+template <class S>
+void
+test(S s)
+{
+    const S& cs = s;
+    typename S::iterator e = s.end();
+    typename S::const_iterator ce1 = cs.end();
+    typename S::const_iterator ce2 = s.cend();
+
+    if (s.empty())
+    {
+        assert(  e ==  s.begin());
+        assert(ce1 == cs.begin());
+        assert(ce2 ==  s.begin());
+    }
+    else
+    {
+        assert(  e !=  s.begin());
+        assert(ce1 != cs.begin());
+        assert(ce2 !=  s.begin());
+    }
+    
+    assert(  e -  s.begin() == s.size());
+    assert(ce1 - cs.begin() == cs.size());
+    assert(ce2 - s.cbegin() == s.size());
+
+    assert(  e == ce1);
+    assert(  e == ce2);
+    assert(ce1 == ce2);
+}
+
+
+int main()
+{
+    using string_view    = std::experimental::string_view;
+    using u16string_view = std::experimental::u16string_view;
+    using u32string_view = std::experimental::u32string_view;
+    using wstring_view   = std::experimental::wstring_view;
+
+    test(string_view   ());
+    test(u16string_view());
+    test(u32string_view());
+    test(wstring_view  ());
+    test(string_view   ( "123"));
+    test(wstring_view  (L"123"));
+#if __cplusplus >= 201103L
+    test(u16string_view{u"123"});
+    test(u32string_view{U"123"});
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr string_view       sv { "123", 3 };
+    constexpr u16string_view u16sv {u"123", 3 };
+    constexpr u32string_view u32sv {U"123", 3 };
+    constexpr wstring_view     wsv {L"123", 3 };
+    
+    static_assert (    sv.begin() !=    sv.end(), "" );
+    static_assert ( u16sv.begin() != u16sv.end(), "" );
+    static_assert ( u32sv.begin() != u32sv.end(), "" );
+    static_assert (   wsv.begin() !=   wsv.end(), "" );
+
+    static_assert (    sv.begin() !=    sv.cend(), "" );
+    static_assert ( u16sv.begin() != u16sv.cend(), "" );
+    static_assert ( u32sv.begin() != u32sv.cend(), "" );
+    static_assert (   wsv.begin() !=   wsv.cend(), "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.iterators/rbegin.pass.cpp

@@ -0,0 +1,59 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// const_iterator rbegin() const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+template <class S>
+void
+test(S s)
+{
+    const S& cs = s;
+    typename S::reverse_iterator b = s.rbegin();
+    typename S::const_reverse_iterator cb1 = cs.rbegin();
+    typename S::const_reverse_iterator cb2 = s.crbegin();
+    if (!s.empty())
+    {
+        const size_t last = s.size() - 1;
+        assert(   *b ==  s[last]);
+        assert(  &*b == &s[last]);
+        assert( *cb1 ==  s[last]);
+        assert(&*cb1 == &s[last]);
+        assert( *cb2 ==  s[last]);
+        assert(&*cb2 == &s[last]);
+        
+    }
+    assert(  b == cb1);
+    assert(  b == cb2);
+    assert(cb1 == cb2);
+}
+
+
+int main()
+{
+    using string_view    = std::experimental::string_view;
+    using u16string_view = std::experimental::u16string_view;
+    using u32string_view = std::experimental::u32string_view;
+    using wstring_view   = std::experimental::wstring_view;
+
+    test(string_view   ());
+    test(u16string_view());
+    test(u32string_view());
+    test(wstring_view  ());
+    test(string_view   ( "123"));
+    test(wstring_view  (L"123"));
+#if __cplusplus >= 201103L
+    test(u16string_view{u"123"});
+    test(u32string_view{U"123"});
+#endif
+}

test/experimental/string.view/string.view.iterators/rend.pass.cpp

@@ -0,0 +1,66 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr const_iterator rend() const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+template <class S>
+void
+test(S s)
+{
+    const S& cs = s;
+    typename S::reverse_iterator e = s.rend();
+    typename S::const_reverse_iterator ce1 = cs.rend();
+    typename S::const_reverse_iterator ce2 = s.crend();
+
+    if (s.empty())
+    {
+        assert(  e ==  s.rbegin());
+        assert(ce1 == cs.rbegin());
+        assert(ce2 ==  s.rbegin());
+    }
+    else
+    {
+        assert(  e !=  s.rbegin());
+        assert(ce1 != cs.rbegin());
+        assert(ce2 !=  s.rbegin());
+    }
+    
+    assert(  e -  s.rbegin() == s.size());
+    assert(ce1 - cs.rbegin() == cs.size());
+    assert(ce2 - s.crbegin() == s.size());
+
+    assert(  e == ce1);
+    assert(  e == ce2);
+    assert(ce1 == ce2);
+}
+
+
+int main()
+{
+    using string_view    = std::experimental::string_view;
+    using u16string_view = std::experimental::u16string_view;
+    using u32string_view = std::experimental::u32string_view;
+    using wstring_view   = std::experimental::wstring_view;
+
+    test(string_view   ());
+    test(u16string_view());
+    test(u32string_view());
+    test(wstring_view  ());
+    test(string_view   ( "123"));
+    test(wstring_view  (L"123"));
+#if __cplusplus >= 201103L
+    test(u16string_view{u"123"});
+    test(u32string_view{U"123"});
+#endif
+}

test/experimental/string.view/string.view.modifiers/clear.pass.cpp

@@ -0,0 +1,65 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// void clear() noexcept
+
+#include <experimental/string_view>
+#include <cassert>
+
+template<typename CharT>
+void test ( const CharT *s, size_t len ) {
+    typedef std::experimental::basic_string_view<CharT> SV;
+    {
+    SV sv1 ( s );
+    assert ( sv1.size() == len );
+    assert ( sv1.data() == s );
+
+    sv1.clear ();
+    assert ( sv1.data() == nullptr );
+    assert ( sv1.size() == 0 );
+    assert ( sv1 == SV());
+    }
+}
+
+#if _LIBCPP_STD_VER > 11
+constexpr size_t test_ce ( size_t n ) {
+    typedef std::experimental::basic_string_view<char> SV;
+    SV sv1{ "ABCDEFGHIJKL", n };
+    sv1.clear();
+    return sv1.size();
+}
+#endif
+
+int main () {
+    test ( "ABCDE", 5 );
+    test ( "a", 1 );
+    test ( "", 0 );
+
+    test ( L"ABCDE", 5 );
+    test ( L"a", 1 );
+    test ( L"", 0 );
+
+#if __cplusplus >= 201103L
+    test ( u"ABCDE", 5 );
+    test ( u"a", 1 );
+    test ( u"", 0 );
+
+    test ( U"ABCDE", 5 );
+    test ( U"a", 1 );
+    test ( U"", 0 );
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    static_assert ( test_ce (5) == 0, "" );
+#endif
+
+}

test/experimental/string.view/string.view.modifiers/remove_prefix.pass.cpp

@@ -0,0 +1,79 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// void remove_prefix(size_type _n)
+
+#include <experimental/string_view>
+#include <cassert>
+#include <iostream>
+
+template<typename CharT>
+void test ( const CharT *s, size_t len ) {
+    typedef std::experimental::basic_string_view<CharT> SV;
+    {
+    SV sv1 ( s );
+    assert ( sv1.size() == len );
+    assert ( sv1.data() == s );
+
+    if ( len > 0 ) {
+        sv1.remove_prefix ( 1 );
+        assert ( sv1.size() == (len - 1));
+        assert ( sv1.data() == (s + 1));
+    }
+    
+    sv1.remove_prefix ( len - 1 );
+    assert ( sv1.size() == 0 );
+
+    SV sv2 ( s );
+    sv2.remove_prefix ( len << 1 );
+    assert ( sv1.size() == 0 ); 
+    }
+}
+
+#if _LIBCPP_STD_VER > 11
+constexpr size_t test_ce ( size_t n, size_t k ) {
+    typedef std::experimental::basic_string_view<char> SV;
+    SV sv1{ "ABCDEFGHIJKL", n };
+    sv1.remove_prefix ( k );
+    return sv1.size();
+}
+#endif
+
+int main () {
+    test ( "ABCDE", 5 );
+    test ( "a", 1 );
+    test ( "", 0 );
+
+    test ( L"ABCDE", 5 );
+    test ( L"a", 1 );
+    test ( L"", 0 );
+
+#if __cplusplus >= 201103L
+    test ( u"ABCDE", 5 );
+    test ( u"a", 1 );
+    test ( u"", 0 );
+
+    test ( U"ABCDE", 5 );
+    test ( U"a", 1 );
+    test ( U"", 0 );
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    static_assert ( test_ce ( 5, 0 ) == 5, "" );
+    static_assert ( test_ce ( 5, 1 ) == 4, "" );
+    static_assert ( test_ce ( 5, 5 ) == 0, "" );
+    static_assert ( test_ce ( 5, 9 ) == 0, "" );
+    static_assert ( test_ce ( 9, 3 ) == 6, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.modifiers/remove_suffix.pass.cpp

@@ -0,0 +1,79 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// void remove_suffix(size_type _n)
+
+#include <experimental/string_view>
+#include <cassert>
+
+template<typename CharT>
+void test ( const CharT *s, size_t len ) {
+    typedef std::experimental::basic_string_view<CharT> SV;
+    {
+    SV sv1 ( s );
+    assert ( sv1.size() == len );
+    assert ( sv1.data() == s );
+
+    if ( len > 0 ) {
+        sv1.remove_suffix ( 1 );
+        assert ( sv1.size() == (len - 1));
+        assert ( sv1.data() == s);
+        }
+        
+    sv1.remove_suffix ( len - 1 );
+    assert ( sv1.size() == 0 );
+
+    SV sv2 ( s );
+    sv2.remove_suffix ( len << 1 );
+    assert ( sv1.size() == 0 ); 
+    }
+
+}
+
+#if _LIBCPP_STD_VER > 11
+constexpr size_t test_ce ( size_t n, size_t k ) {
+    typedef std::experimental::basic_string_view<char> SV;
+    SV sv1{ "ABCDEFGHIJKL", n };
+    sv1.remove_suffix ( k );
+    return sv1.size();
+}
+#endif
+
+int main () {
+    test ( "ABCDE", 5 );
+    test ( "a", 1 );
+    test ( "", 0 );
+
+    test ( L"ABCDE", 5 );
+    test ( L"a", 1 );
+    test ( L"", 0 );
+
+#if __cplusplus >= 201103L
+    test ( u"ABCDE", 5 );
+    test ( u"a", 1 );
+    test ( u"", 0 );
+
+    test ( U"ABCDE", 5 );
+    test ( U"a", 1 );
+    test ( U"", 0 );
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    static_assert ( test_ce ( 5, 0 ) == 5, "" );
+    static_assert ( test_ce ( 5, 1 ) == 4, "" );
+    static_assert ( test_ce ( 5, 5 ) == 0, "" );
+    static_assert ( test_ce ( 5, 9 ) == 0, "" );
+    static_assert ( test_ce ( 9, 3 ) == 6, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.modifiers/swap.pass.cpp

@@ -0,0 +1,74 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// void swap(basic_string_view& _other) noexcept
+
+#include <experimental/string_view>
+#include <cassert>
+
+template<typename CharT>
+void test ( const CharT *s, size_t len ) {
+    typedef std::experimental::basic_string_view<CharT> SV;
+    {
+    SV sv1(s);
+    SV sv2;
+    
+    assert ( sv1.size() == len );
+    assert ( sv1.data() == s );
+    assert ( sv2.size() == 0 );
+
+    sv1.swap ( sv2 );
+    assert ( sv1.size() == 0 );
+    assert ( sv2.size() == len );
+    assert ( sv2.data() == s );
+    }
+
+}
+
+#if _LIBCPP_STD_VER > 11
+constexpr size_t test_ce ( size_t n, size_t k ) {
+    typedef std::experimental::basic_string_view<char> SV;
+    SV sv1{ "ABCDEFGHIJKL", n };
+    SV sv2 { sv1.data(), k };
+    sv1.swap ( sv2 );
+    return sv1.size();
+}
+#endif
+
+
+int main () {
+    test ( "ABCDE", 5 );
+    test ( "a", 1 );
+    test ( "", 0 );
+
+    test ( L"ABCDE", 5 );
+    test ( L"a", 1 );
+    test ( L"", 0 );
+
+#if __cplusplus >= 201103L
+    test ( u"ABCDE", 5 );
+    test ( u"a", 1 );
+    test ( u"", 0 );
+
+    test ( U"ABCDE", 5 );
+    test ( U"a", 1 );
+    test ( U"", 0 );
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    static_assert ( test_ce (2, 3) == 3, "" );
+    static_assert ( test_ce (5, 3) == 3, "" );
+    static_assert ( test_ce (0, 1) == 1, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.nonmem/quoted.pass.cpp

@@ -0,0 +1,212 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <iomanip>
+
+// quoted
+
+#include <iomanip>
+#include <sstream>
+#include <experimental/string_view>
+#include <cassert>
+
+#if _LIBCPP_STD_VER > 11
+// quoted is C++14 only
+
+bool is_skipws ( const std::istream *is ) {
+    return ( is->flags() & std::ios_base::skipws ) != 0;
+    }
+
+
+bool is_skipws ( const std::wistream *is ) {
+    return ( is->flags() & std::ios_base::skipws ) != 0;
+    }
+
+void round_trip ( const char *p ) {
+    std::stringstream ss;
+    bool skippingws = is_skipws ( &ss );
+    std::experimental::string_view sv {p};
+
+    ss << std::quoted(sv);
+    std::string s;
+    ss >> std::quoted(s);
+    assert ( s == sv );
+    assert ( skippingws == is_skipws ( &ss ));
+    }
+
+void round_trip_ws ( const char *p ) {
+    std::stringstream ss;
+    std::noskipws ( ss );
+    bool skippingws = is_skipws ( &ss );
+    std::experimental::string_view sv {p};
+
+    ss << std::quoted(sv);
+    std::string s;
+    ss >> std::quoted(s);
+    assert ( s == sv );
+    assert ( skippingws == is_skipws ( &ss ));
+    }
+
+void round_trip_d ( const char *p, char delim ) {
+    std::stringstream ss;
+    std::experimental::string_view sv {p};
+
+    ss << std::quoted(sv, delim);
+    std::string s;
+    ss >> std::quoted(s, delim);
+    assert ( s == sv );
+    }
+
+void round_trip_e ( const char *p, char escape ) {
+    std::stringstream ss;
+    std::experimental::string_view sv {p};
+
+    ss << std::quoted(sv, '"', escape );
+    std::string s;
+    ss >> std::quoted(s, '"', escape );
+    assert ( s == sv );
+    }
+
+
+
+std::string quote ( const char *p, char delim='"', char escape='\\' ) {
+    std::stringstream ss;
+    ss << std::quoted(p, delim, escape);
+    std::string s;
+    ss >> s;    // no quote
+    return s;
+}
+
+std::string unquote ( const char *p, char delim='"', char escape='\\' ) {
+    std::stringstream ss;
+    ss << p;
+    std::string s;
+    ss >> std::quoted(s, delim, escape);
+    return s;
+}
+
+
+void round_trip ( const wchar_t *p ) {
+    std::wstringstream ss;
+    bool skippingws = is_skipws ( &ss );
+    std::experimental::wstring_view sv {p};
+
+    ss << std::quoted(sv);
+    std::wstring s;
+    ss >> std::quoted(s);
+    assert ( s == sv );
+    assert ( skippingws == is_skipws ( &ss ));
+    }
+    
+
+void round_trip_ws ( const wchar_t *p ) {
+    std::wstringstream ss;
+    std::noskipws ( ss );
+    bool skippingws = is_skipws ( &ss );
+    std::experimental::wstring_view sv {p};
+
+    ss << std::quoted(sv);
+    std::wstring s;
+    ss >> std::quoted(s);
+    assert ( s == sv );
+    assert ( skippingws == is_skipws ( &ss ));
+    }
+
+void round_trip_d ( const wchar_t *p, wchar_t delim ) {
+    std::wstringstream ss;
+    std::experimental::wstring_view sv {p};
+
+    ss << std::quoted(sv, delim);
+    std::wstring s;
+    ss >> std::quoted(s, delim);
+    assert ( s == sv );
+    }
+
+void round_trip_e ( const wchar_t *p, wchar_t escape ) {
+    std::wstringstream ss;
+    std::experimental::wstring_view sv {p};
+
+    ss << std::quoted(sv, wchar_t('"'), escape );
+    std::wstring s;
+    ss >> std::quoted(s, wchar_t('"'), escape );
+    assert ( s == sv );
+    }
+
+
+std::wstring quote ( const wchar_t *p, wchar_t delim='"', wchar_t escape='\\' ) {
+    std::wstringstream ss;
+    std::experimental::wstring_view sv {p};
+
+    ss << std::quoted(sv, delim, escape);
+    std::wstring s;
+    ss >> s;    // no quote
+    return s;
+}
+
+std::wstring unquote ( const wchar_t *p, wchar_t delim='"', wchar_t escape='\\' ) {
+    std::wstringstream ss;
+    std::experimental::wstring_view sv {p};
+
+    ss << sv;
+    std::wstring s;
+    ss >> std::quoted(s, delim, escape);
+    return s;
+}
+
+int main()
+{
+    round_trip    (  "" );
+    round_trip_ws (  "" );
+    round_trip_d  (  "", 'q' );
+    round_trip_e  (  "", 'q' );
+    
+    round_trip    ( L"" );
+    round_trip_ws ( L"" );
+    round_trip_d  ( L"", 'q' );
+    round_trip_e  ( L"", 'q' );
+    
+    round_trip    (  "Hi" );
+    round_trip_ws (  "Hi" );
+    round_trip_d  (  "Hi", '!' );
+    round_trip_e  (  "Hi", '!' );
+    assert ( quote ( "Hi", '!' ) == "!Hi!" );
+    assert ( quote ( "Hi!", '!' ) == R"(!Hi\!!)" );
+    
+    round_trip    ( L"Hi" );
+    round_trip_ws ( L"Hi" );
+    round_trip_d  ( L"Hi", '!' );
+    round_trip_e  ( L"Hi", '!' );
+    assert ( quote ( L"Hi", '!' )  == L"!Hi!" );
+    assert ( quote ( L"Hi!", '!' ) == LR"(!Hi\!!)" );
+    
+    round_trip    (  "Hi Mom" );
+    round_trip_ws (  "Hi Mom" );
+    round_trip    ( L"Hi Mom" );
+    round_trip_ws ( L"Hi Mom" );
+    
+    assert ( quote (  "" )  ==  "\"\"" );
+    assert ( quote ( L"" )  == L"\"\"" );
+    assert ( quote (  "a" ) ==  "\"a\"" );
+    assert ( quote ( L"a" ) == L"\"a\"" );
+
+//  missing end quote - must not hang
+    assert ( unquote (  "\"abc" ) ==  "abc" );
+    assert ( unquote ( L"\"abc" ) == L"abc" );
+    
+    assert ( unquote (  "abc" ) == "abc" ); // no delimiter
+    assert ( unquote ( L"abc" ) == L"abc" ); // no delimiter
+    assert ( unquote (  "abc def" ) ==  "abc" ); // no delimiter
+    assert ( unquote ( L"abc def" ) == L"abc" ); // no delimiter
+
+    assert ( unquote (  "" ) ==  "" ); // nothing there
+    assert ( unquote ( L"" ) == L"" ); // nothing there
+    }
+#else
+int main() {}
+#endif

test/experimental/string.view/string.view.ops/basic_string.pass.cpp

@@ -0,0 +1,63 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// template<class _Allocator>
+// explicit operator basic_string<_CharT, _Traits, _Allocator>() const
+
+#include <experimental/string_view>
+#include <cassert>
+
+template<typename CharT>
+void test ( const CharT *s ) {
+    typedef std::experimental::basic_string_view<CharT> string_view_t;
+    typedef std::basic_string<CharT> string_t;
+    
+    {
+    string_view_t sv1 ( s );
+    string_t      str = (string_t) sv1;
+
+    assert ( sv1.size() == str.size ());
+    assert ( std::char_traits<CharT>::compare ( sv1.data(), str.data(), sv1.size()) == 0 );
+    }
+
+    {
+    string_view_t sv1;
+    string_t      str = (string_t) sv1;
+
+    assert ( sv1.size() == str.size ());
+    assert ( std::char_traits<CharT>::compare ( sv1.data(), str.data(), sv1.size()) == 0 );
+    }
+}
+
+int main () {
+    test ( "ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( "ABCDE");
+    test ( "a" );
+    test ( "" );
+
+    test ( L"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( L"ABCDE" );
+    test ( L"a" );
+    test ( L"" );
+
+#if __cplusplus >= 201103L
+    test ( u"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( u"ABCDE" );
+    test ( u"a" );
+    test ( u"" );
+
+    test ( U"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( U"ABCDE" );
+    test ( U"a" );
+    test ( U"" );
+#endif
+}

test/experimental/string.view/string.view.ops/compare.pointer.pass.cpp

@@ -0,0 +1,126 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr int compare(const charT* s) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+int sign ( int x ) { return x > 0 ? 1 : ( x < 0 ? -1 : 0 ); }
+
+template<typename CharT>
+void test1 ( std::experimental::basic_string_view<CharT> sv1, const CharT *s, int expected ) {
+    assert ( sign( sv1.compare(s)) == sign(expected));
+}
+
+template<typename CharT>
+void
+test( const CharT *s1, const CharT *s2, int expected)
+{
+    typedef std::experimental::basic_string_view<CharT> string_view_t;
+    string_view_t sv1 ( s1 );
+    test1 ( sv1, s2, expected );
+}
+
+int main()
+{
+    {
+    test("", "", 0);
+    test("", "abcde", -5);
+    test("", "abcdefghij", -10);
+    test("", "abcdefghijklmnopqrst", -20);
+    test("abcde", "", 5);
+    test("abcde", "abcde", 0);
+    test("abcde", "abcdefghij", -5);
+    test("abcde", "abcdefghijklmnopqrst", -15);
+    test("abcdefghij", "", 10);
+    test("abcdefghij", "abcde", 5);
+    test("abcdefghij", "abcdefghij", 0);
+    test("abcdefghij", "abcdefghijklmnopqrst", -10);
+    test("abcdefghijklmnopqrst", "", 20);
+    test("abcdefghijklmnopqrst", "abcde", 15);
+    test("abcdefghijklmnopqrst", "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", "abcdefghijklmnopqrst", 0);
+    }
+
+    {
+    test(L"", L"", 0);
+    test(L"", L"abcde", -5);
+    test(L"", L"abcdefghij", -10);
+    test(L"", L"abcdefghijklmnopqrst", -20);
+    test(L"abcde", L"", 5);
+    test(L"abcde", L"abcde", 0);
+    test(L"abcde", L"abcdefghij", -5);
+    test(L"abcde", L"abcdefghijklmnopqrst", -15);
+    test(L"abcdefghij", L"", 10);
+    test(L"abcdefghij", L"abcde", 5);
+    test(L"abcdefghij", L"abcdefghij", 0);
+    test(L"abcdefghij", L"abcdefghijklmnopqrst", -10);
+    test(L"abcdefghijklmnopqrst", L"", 20);
+    test(L"abcdefghijklmnopqrst", L"abcde", 15);
+    test(L"abcdefghijklmnopqrst", L"abcdefghij", 10);
+    test(L"abcdefghijklmnopqrst", L"abcdefghijklmnopqrst", 0);
+    }
+
+#if __cplusplus >= 201103L
+    {
+    test(U"", U"", 0);
+    test(U"", U"abcde", -5);
+    test(U"", U"abcdefghij", -10);
+    test(U"", U"abcdefghijklmnopqrst", -20);
+    test(U"abcde", U"", 5);
+    test(U"abcde", U"abcde", 0);
+    test(U"abcde", U"abcdefghij", -5);
+    test(U"abcde", U"abcdefghijklmnopqrst", -15);
+    test(U"abcdefghij", U"", 10);
+    test(U"abcdefghij", U"abcde", 5);
+    test(U"abcdefghij", U"abcdefghij", 0);
+    test(U"abcdefghij", U"abcdefghijklmnopqrst", -10);
+    test(U"abcdefghijklmnopqrst", U"", 20);
+    test(U"abcdefghijklmnopqrst", U"abcde", 15);
+    test(U"abcdefghijklmnopqrst", U"abcdefghij", 10);
+    test(U"abcdefghijklmnopqrst", U"abcdefghijklmnopqrst", 0);
+    }
+
+    {
+    test(u"", u"", 0);
+    test(u"", u"abcde", -5);
+    test(u"", u"abcdefghij", -10);
+    test(u"", u"abcdefghijklmnopqrst", -20);
+    test(u"abcde", u"", 5);
+    test(u"abcde", u"abcde", 0);
+    test(u"abcde", u"abcdefghij", -5);
+    test(u"abcde", u"abcdefghijklmnopqrst", -15);
+    test(u"abcdefghij", u"", 10);
+    test(u"abcdefghij", u"abcde", 5);
+    test(u"abcdefghij", u"abcdefghij", 0);
+    test(u"abcdefghij", u"abcdefghijklmnopqrst", -10);
+    test(u"abcdefghijklmnopqrst", u"", 20);
+    test(u"abcdefghijklmnopqrst", u"abcde", 15);
+    test(u"abcdefghijklmnopqrst", u"abcdefghij", 10);
+    test(u"abcdefghijklmnopqrst", u"abcdefghijklmnopqrst", 0);
+    }
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+    static_assert ( sv1.compare("") == 0, "" );
+    static_assert ( sv1.compare("abcde") == -1, "" );
+    static_assert ( sv2.compare("") == 1, "" );
+    static_assert ( sv2.compare("abcde") == 0, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.ops/compare.pointer_size.pass.cpp

@@ -0,0 +1,444 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr int compare(size_type pos1, size_type n1, const charT* s) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+int sign ( int x ) { return x > 0 ? 1 : ( x < 0 ? -1 : 0 ); }
+
+template<typename CharT>
+void test1 ( std::experimental::basic_string_view<CharT> sv1, 
+             size_t pos1, size_t n1, const CharT *s, int expected ) {
+    try {
+        assert(sign(sv1.compare(pos1, n1, s)) == sign(expected));
+        assert(pos1 <= sv1.size());
+    }
+    catch (const std::out_of_range&) { assert(pos1 > sv1.size()); }
+}
+
+template<typename CharT>
+void
+test( const CharT *s1, size_t pos1, size_t n1, const CharT *s2, int expected)
+{
+    typedef std::experimental::basic_string_view<CharT> string_view_t;
+    string_view_t sv1 ( s1 );
+    test1 ( sv1, pos1, n1, s2, expected );
+}
+
+void test0()
+{
+    test("", 0, 0, "", 0);
+    test("", 0, 0, "abcde", -5);
+    test("", 0, 0, "abcdefghij", -10);
+    test("", 0, 0, "abcdefghijklmnopqrst", -20);
+    test("", 0, 1, "", 0);
+    test("", 0, 1, "abcde", -5);
+    test("", 0, 1, "abcdefghij", -10);
+    test("", 0, 1, "abcdefghijklmnopqrst", -20);
+    test("", 1, 0, "", 0);
+    test("", 1, 0, "abcde", 0);
+    test("", 1, 0, "abcdefghij", 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 0);
+    test("abcde", 0, 0, "", 0);
+    test("abcde", 0, 0, "abcde", -5);
+    test("abcde", 0, 0, "abcdefghij", -10);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 0, 1, "", 1);
+    test("abcde", 0, 1, "abcde", -4);
+    test("abcde", 0, 1, "abcdefghij", -9);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", -19);
+    test("abcde", 0, 2, "", 2);
+    test("abcde", 0, 2, "abcde", -3);
+    test("abcde", 0, 2, "abcdefghij", -8);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", -18);
+    test("abcde", 0, 4, "", 4);
+    test("abcde", 0, 4, "abcde", -1);
+    test("abcde", 0, 4, "abcdefghij", -6);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", -16);
+    test("abcde", 0, 5, "", 5);
+    test("abcde", 0, 5, "abcde", 0);
+    test("abcde", 0, 5, "abcdefghij", -5);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", -15);
+    test("abcde", 0, 6, "", 5);
+    test("abcde", 0, 6, "abcde", 0);
+    test("abcde", 0, 6, "abcdefghij", -5);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", -15);
+    test("abcde", 1, 0, "", 0);
+    test("abcde", 1, 0, "abcde", -5);
+    test("abcde", 1, 0, "abcdefghij", -10);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 1, 1, "", 1);
+    test("abcde", 1, 1, "abcde", 1);
+    test("abcde", 1, 1, "abcdefghij", 1);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 1);
+    test("abcde", 1, 2, "", 2);
+    test("abcde", 1, 2, "abcde", 1);
+    test("abcde", 1, 2, "abcdefghij", 1);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 1);
+    test("abcde", 1, 3, "", 3);
+    test("abcde", 1, 3, "abcde", 1);
+    test("abcde", 1, 3, "abcdefghij", 1);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 1);
+    test("abcde", 1, 4, "", 4);
+    test("abcde", 1, 4, "abcde", 1);
+    test("abcde", 1, 4, "abcdefghij", 1);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 1);
+    test("abcde", 1, 5, "", 4);
+    test("abcde", 1, 5, "abcde", 1);
+    test("abcde", 1, 5, "abcdefghij", 1);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 1);
+    test("abcde", 2, 0, "", 0);
+    test("abcde", 2, 0, "abcde", -5);
+    test("abcde", 2, 0, "abcdefghij", -10);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 2, 1, "", 1);
+    test("abcde", 2, 1, "abcde", 2);
+    test("abcde", 2, 1, "abcdefghij", 2);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 2);
+    test("abcde", 2, 2, "", 2);
+    test("abcde", 2, 2, "abcde", 2);
+    test("abcde", 2, 2, "abcdefghij", 2);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 2);
+    test("abcde", 2, 3, "", 3);
+    test("abcde", 2, 3, "abcde", 2);
+    test("abcde", 2, 3, "abcdefghij", 2);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 2);
+    test("abcde", 2, 4, "", 3);
+    test("abcde", 2, 4, "abcde", 2);
+    test("abcde", 2, 4, "abcdefghij", 2);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 2);
+    test("abcde", 4, 0, "", 0);
+    test("abcde", 4, 0, "abcde", -5);
+    test("abcde", 4, 0, "abcdefghij", -10);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 4, 1, "", 1);
+    test("abcde", 4, 1, "abcde", 4);
+    test("abcde", 4, 1, "abcdefghij", 4);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 4);
+    test("abcde", 4, 2, "", 1);
+    test("abcde", 4, 2, "abcde", 4);
+    test("abcde", 4, 2, "abcdefghij", 4);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 4);
+    test("abcde", 5, 0, "", 0);
+    test("abcde", 5, 0, "abcde", -5);
+    test("abcde", 5, 0, "abcdefghij", -10);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 5, 1, "", 0);
+    test("abcde", 5, 1, "abcde", -5);
+    test("abcde", 5, 1, "abcdefghij", -10);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", -20);
+}
+
+void test1()
+{
+    test("abcde", 6, 0, "", 0);
+    test("abcde", 6, 0, "abcde", 0);
+    test("abcde", 6, 0, "abcdefghij", 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 0);
+    test("abcdefghij", 0, 0, "", 0);
+    test("abcdefghij", 0, 0, "abcde", -5);
+    test("abcdefghij", 0, 0, "abcdefghij", -10);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 0, 1, "", 1);
+    test("abcdefghij", 0, 1, "abcde", -4);
+    test("abcdefghij", 0, 1, "abcdefghij", -9);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", -19);
+    test("abcdefghij", 0, 5, "", 5);
+    test("abcdefghij", 0, 5, "abcde", 0);
+    test("abcdefghij", 0, 5, "abcdefghij", -5);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", -15);
+    test("abcdefghij", 0, 9, "", 9);
+    test("abcdefghij", 0, 9, "abcde", 4);
+    test("abcdefghij", 0, 9, "abcdefghij", -1);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", -11);
+    test("abcdefghij", 0, 10, "", 10);
+    test("abcdefghij", 0, 10, "abcde", 5);
+    test("abcdefghij", 0, 10, "abcdefghij", 0);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", -10);
+    test("abcdefghij", 0, 11, "", 10);
+    test("abcdefghij", 0, 11, "abcde", 5);
+    test("abcdefghij", 0, 11, "abcdefghij", 0);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", -10);
+    test("abcdefghij", 1, 0, "", 0);
+    test("abcdefghij", 1, 0, "abcde", -5);
+    test("abcdefghij", 1, 0, "abcdefghij", -10);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 1, 1, "", 1);
+    test("abcdefghij", 1, 1, "abcde", 1);
+    test("abcdefghij", 1, 1, "abcdefghij", 1);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 1);
+    test("abcdefghij", 1, 4, "", 4);
+    test("abcdefghij", 1, 4, "abcde", 1);
+    test("abcdefghij", 1, 4, "abcdefghij", 1);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 1);
+    test("abcdefghij", 1, 8, "", 8);
+    test("abcdefghij", 1, 8, "abcde", 1);
+    test("abcdefghij", 1, 8, "abcdefghij", 1);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 1);
+    test("abcdefghij", 1, 9, "", 9);
+    test("abcdefghij", 1, 9, "abcde", 1);
+    test("abcdefghij", 1, 9, "abcdefghij", 1);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 1);
+    test("abcdefghij", 1, 10, "", 9);
+    test("abcdefghij", 1, 10, "abcde", 1);
+    test("abcdefghij", 1, 10, "abcdefghij", 1);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 1);
+    test("abcdefghij", 5, 0, "", 0);
+    test("abcdefghij", 5, 0, "abcde", -5);
+    test("abcdefghij", 5, 0, "abcdefghij", -10);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 5, 1, "", 1);
+    test("abcdefghij", 5, 1, "abcde", 5);
+    test("abcdefghij", 5, 1, "abcdefghij", 5);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 5);
+    test("abcdefghij", 5, 2, "", 2);
+    test("abcdefghij", 5, 2, "abcde", 5);
+    test("abcdefghij", 5, 2, "abcdefghij", 5);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 5);
+    test("abcdefghij", 5, 4, "", 4);
+    test("abcdefghij", 5, 4, "abcde", 5);
+    test("abcdefghij", 5, 4, "abcdefghij", 5);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 5);
+    test("abcdefghij", 5, 5, "", 5);
+    test("abcdefghij", 5, 5, "abcde", 5);
+    test("abcdefghij", 5, 5, "abcdefghij", 5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 5);
+    test("abcdefghij", 5, 6, "", 5);
+    test("abcdefghij", 5, 6, "abcde", 5);
+    test("abcdefghij", 5, 6, "abcdefghij", 5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 5);
+    test("abcdefghij", 9, 0, "", 0);
+    test("abcdefghij", 9, 0, "abcde", -5);
+    test("abcdefghij", 9, 0, "abcdefghij", -10);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 9, 1, "", 1);
+    test("abcdefghij", 9, 1, "abcde", 9);
+    test("abcdefghij", 9, 1, "abcdefghij", 9);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 9);
+    test("abcdefghij", 9, 2, "", 1);
+    test("abcdefghij", 9, 2, "abcde", 9);
+    test("abcdefghij", 9, 2, "abcdefghij", 9);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 9);
+    test("abcdefghij", 10, 0, "", 0);
+    test("abcdefghij", 10, 0, "abcde", -5);
+    test("abcdefghij", 10, 0, "abcdefghij", -10);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 10, 1, "", 0);
+    test("abcdefghij", 10, 1, "abcde", -5);
+    test("abcdefghij", 10, 1, "abcdefghij", -10);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 11, 0, "", 0);
+    test("abcdefghij", 11, 0, "abcde", 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 0);
+}
+
+void test2()
+{
+    test("abcdefghijklmnopqrst", 0, 0, "", 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", -5);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 0, 1, "", 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", -4);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", -9);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", -19);
+    test("abcdefghijklmnopqrst", 0, 10, "", 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 5);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 0);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", -10);
+    test("abcdefghijklmnopqrst", 0, 19, "", 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 14);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 9);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", -1);
+    test("abcdefghijklmnopqrst", 0, 20, "", 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 15);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 0);
+    test("abcdefghijklmnopqrst", 0, 21, "", 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 15);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 0);
+    test("abcdefghijklmnopqrst", 1, 0, "", 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", -5);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 1, 1, "", 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 1);
+    test("abcdefghijklmnopqrst", 1, 9, "", 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 1);
+    test("abcdefghijklmnopqrst", 1, 18, "", 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 1);
+    test("abcdefghijklmnopqrst", 1, 19, "", 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 1);
+    test("abcdefghijklmnopqrst", 1, 20, "", 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 1);
+    test("abcdefghijklmnopqrst", 10, 0, "", 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", -5);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 10, 1, "", 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 10);
+    test("abcdefghijklmnopqrst", 10, 5, "", 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 10);
+    test("abcdefghijklmnopqrst", 10, 9, "", 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 10);
+    test("abcdefghijklmnopqrst", 10, 10, "", 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 10);
+    test("abcdefghijklmnopqrst", 10, 11, "", 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 10);
+    test("abcdefghijklmnopqrst", 19, 0, "", 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", -5);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 19, 1, "", 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 19);
+    test("abcdefghijklmnopqrst", 19, 2, "", 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 19);
+    test("abcdefghijklmnopqrst", 20, 0, "", 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", -5);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 20, 1, "", 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", -5);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 21, 0, "", 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 0);
+}
+
+
+int main()
+{
+    test0();
+    test1();
+    test2();
+
+    {
+    test("", 0, 0, "", 0);
+    test("", 0, 0, "abcde", -5);
+    test("", 0, 0, "abcdefghij", -10);
+    test("", 0, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 0, 2, "", 5);
+    test("abcde", 0, 6,"abcde", 0);
+    test("abcde", 0, 6, "abcdefghij", -5);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", -15);
+    test("abcdefghij", 3, 3, "", 10);
+    test("abcdefghij", 3, 3,"abcde", 5);
+    test("abcdefghij", 3, 3, "def", 0);
+    test("abcdefghij", 0, 4, "abcdefghijklmnopqrst", -10);
+    test("abcdefghijklmnopqrst", 5, 5, "", 20);
+    test("abcdefghijklmnopqrst", 0, 8, "abcde", 15);
+    test("abcdefghijklmnopqrst", 0, 12, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 0, -1, "abcdefghijklmnopqrst", 0);
+    }
+
+    {
+    test(L"", 0, 0, L"", 0);
+    test(L"", 0, 0, L"abcde", -5);
+    test(L"", 0, 0, L"abcdefghij", -10);
+    test(L"", 0, 0, L"abcdefghijklmnopqrst", -20);
+    test(L"abcde", 0, 2, L"", 5);
+    test(L"abcde", 0, 6, L"abcde", 0);
+    test(L"abcde", 0, 6, L"abcdefghij", -5);
+    test(L"abcde", 0, 6, L"abcdefghijklmnopqrst", -15);
+    test(L"abcdefghij", 3, 3, L"", 10);
+    test(L"abcdefghij", 3, 3, L"abcde", 5);
+    test(L"abcdefghij", 3, 3, L"def", 0);
+    test(L"abcdefghij", 0, 4, L"abcdefghijklmnopqrst", -10);
+    test(L"abcdefghijklmnopqrst", 5, 5, L"", 20);
+    test(L"abcdefghijklmnopqrst", 0, 8, L"abcde", 15);
+    test(L"abcdefghijklmnopqrst", 0, 12, L"abcdefghij", 10);
+    test(L"abcdefghijklmnopqrst", 0, -1, L"abcdefghijklmnopqrst", 0);
+    }
+
+#if __cplusplus >= 201103L
+    {
+    test(U"", 0, 0, U"", 0);
+    test(U"", 0, 0, U"abcde", -5);
+    test(U"", 0, 0, U"abcdefghij", -10);
+    test(U"", 0, 0, U"abcdefghijklmnopqrst", -20);
+    test(U"abcde", 0, 2, U"", 5);
+    test(U"abcde", 0, 6, U"abcde", 0);
+    test(U"abcde", 0, 6, U"abcdefghij", -5);
+    test(U"abcde", 0, 6, U"abcdefghijklmnopqrst", -15);
+    test(U"abcdefghij", 3, 3, U"", 10);
+    test(U"abcdefghij", 3, 3, U"abcde", 5);
+    test(U"abcdefghij", 3, 3, U"def", 0);
+    test(U"abcdefghij", 0, 4, U"abcdefghijklmnopqrst", -10);
+    test(U"abcdefghijklmnopqrst", 5, 5, U"", 20);
+    test(U"abcdefghijklmnopqrst", 0, 8, U"abcde", 15);
+    test(U"abcdefghijklmnopqrst", 0, 12, U"abcdefghij", 10);
+    test(U"abcdefghijklmnopqrst", 0, -1, U"abcdefghijklmnopqrst", 0);
+    }
+ 
+    {
+    test(u"", 0, 0, u"", 0);
+    test(u"", 0, 0, u"abcde", -5);
+    test(u"", 0, 0, u"abcdefghij", -10);
+    test(u"", 0, 0, u"abcdefghijklmnopqrst", -20);
+    test(u"abcde", 0, 2, u"", 5);
+    test(u"abcde", 0, 6, u"abcde", 0);
+    test(u"abcde", 0, 6, u"abcdefghij", -5);
+    test(u"abcde", 0, 6, u"abcdefghijklmnopqrst", -15);
+    test(u"abcdefghij", 3, 3, u"", 10);
+    test(u"abcdefghij", 3, 3, u"abcde", 5);
+    test(u"abcdefghij", 3, 3, u"def", 0);
+    test(u"abcdefghij", 0, 4, u"abcdefghijklmnopqrst", -10);
+    test(u"abcdefghijklmnopqrst", 5, 5, u"", 20);
+    test(u"abcdefghijklmnopqrst", 0, 8, u"abcde", 15);
+    test(u"abcdefghijklmnopqrst", 0, 12, u"abcdefghij", 10);
+    test(u"abcdefghijklmnopqrst", 0, -1, u"abcdefghijklmnopqrst", 0);
+    }
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+    static_assert ( sv1.compare(0, 0, "") == 0, "" );
+    static_assert ( sv1.compare(0, 0, "abcde") == -1, "" );
+    static_assert ( sv2.compare(0, 2, "") == 1, "" );
+    static_assert ( sv2.compare(0, 6, "abcde") == 0, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.ops/compare.size_size_sv.pass.cpp

@@ -0,0 +1,397 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// constexpr int compare(size_type pos1, size_type n1, basic_string_view str) const;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+int sign ( int x ) { return x > 0 ? 1 : ( x < 0 ? -1 : 0 ); }
+
+template<typename CharT>
+void test1 ( std::experimental::basic_string_view<CharT> sv1, size_t pos1, size_t n1,
+            std::experimental::basic_string_view<CharT> sv2, int expected ) {
+
+    try
+    {
+        assert ( sign( sv1.compare(pos1, n1, sv2)) == sign(expected));
+        assert(pos1 <= sv1.size());
+    }
+    catch (const std::out_of_range&) { assert(pos1 > sv1.size()); }
+}
+
+
+template<typename CharT>
+void test ( const CharT *s1, size_t pos1, size_t n1, const CharT  *s2, int expected ) {
+    typedef std::experimental::basic_string_view<CharT> string_view_t;
+    
+    string_view_t sv1 ( s1 );
+    string_view_t sv2 ( s2 );
+    test1(sv1, pos1, n1, sv2, expected);
+}
+
+void test0()
+{
+    test("", 0, 0, "", 0);
+    test("", 0, 0, "abcde", -5);
+    test("", 0, 0, "abcdefghij", -10);
+    test("", 0, 0, "abcdefghijklmnopqrst", -20);
+    test("", 0, 1, "", 0);
+    test("", 0, 1, "abcde", -5);
+    test("", 0, 1, "abcdefghij", -10);
+    test("", 0, 1, "abcdefghijklmnopqrst", -20);
+    test("", 1, 0, "", 0);
+    test("", 1, 0, "abcde", 0);
+    test("", 1, 0, "abcdefghij", 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 0);
+    test("abcde", 0, 0, "", 0);
+    test("abcde", 0, 0, "abcde", -5);
+    test("abcde", 0, 0, "abcdefghij", -10);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 0, 1, "", 1);
+    test("abcde", 0, 1, "abcde", -4);
+    test("abcde", 0, 1, "abcdefghij", -9);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", -19);
+    test("abcde", 0, 2, "", 2);
+    test("abcde", 0, 2, "abcde", -3);
+    test("abcde", 0, 2, "abcdefghij", -8);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", -18);
+    test("abcde", 0, 4, "", 4);
+    test("abcde", 0, 4, "abcde", -1);
+    test("abcde", 0, 4, "abcdefghij", -6);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", -16);
+    test("abcde", 0, 5, "", 5);
+    test("abcde", 0, 5, "abcde", 0);
+    test("abcde", 0, 5, "abcdefghij", -5);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", -15);
+    test("abcde", 0, 6, "", 5);
+    test("abcde", 0, 6, "abcde", 0);
+    test("abcde", 0, 6, "abcdefghij", -5);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", -15);
+    test("abcde", 1, 0, "", 0);
+    test("abcde", 1, 0, "abcde", -5);
+    test("abcde", 1, 0, "abcdefghij", -10);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 1, 1, "", 1);
+    test("abcde", 1, 1, "abcde", 1);
+    test("abcde", 1, 1, "abcdefghij", 1);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 1);
+    test("abcde", 1, 2, "", 2);
+    test("abcde", 1, 2, "abcde", 1);
+    test("abcde", 1, 2, "abcdefghij", 1);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 1);
+    test("abcde", 1, 3, "", 3);
+    test("abcde", 1, 3, "abcde", 1);
+    test("abcde", 1, 3, "abcdefghij", 1);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 1);
+    test("abcde", 1, 4, "", 4);
+    test("abcde", 1, 4, "abcde", 1);
+    test("abcde", 1, 4, "abcdefghij", 1);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 1);
+    test("abcde", 1, 5, "", 4);
+    test("abcde", 1, 5, "abcde", 1);
+    test("abcde", 1, 5, "abcdefghij", 1);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 1);
+    test("abcde", 2, 0, "", 0);
+    test("abcde", 2, 0, "abcde", -5);
+    test("abcde", 2, 0, "abcdefghij", -10);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 2, 1, "", 1);
+    test("abcde", 2, 1, "abcde", 2);
+    test("abcde", 2, 1, "abcdefghij", 2);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 2);
+    test("abcde", 2, 2, "", 2);
+    test("abcde", 2, 2, "abcde", 2);
+    test("abcde", 2, 2, "abcdefghij", 2);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 2);
+    test("abcde", 2, 3, "", 3);
+    test("abcde", 2, 3, "abcde", 2);
+    test("abcde", 2, 3, "abcdefghij", 2);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 2);
+    test("abcde", 2, 4, "", 3);
+    test("abcde", 2, 4, "abcde", 2);
+    test("abcde", 2, 4, "abcdefghij", 2);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 2);
+    test("abcde", 4, 0, "", 0);
+    test("abcde", 4, 0, "abcde", -5);
+    test("abcde", 4, 0, "abcdefghij", -10);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 4, 1, "", 1);
+    test("abcde", 4, 1, "abcde", 4);
+    test("abcde", 4, 1, "abcdefghij", 4);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 4);
+    test("abcde", 4, 2, "", 1);
+    test("abcde", 4, 2, "abcde", 4);
+    test("abcde", 4, 2, "abcdefghij", 4);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 4);
+    test("abcde", 5, 0, "", 0);
+    test("abcde", 5, 0, "abcde", -5);
+    test("abcde", 5, 0, "abcdefghij", -10);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 5, 1, "", 0);
+    test("abcde", 5, 1, "abcde", -5);
+    test("abcde", 5, 1, "abcdefghij", -10);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", -20);
+}
+
+void test1()
+{
+    test("abcde", 6, 0, "", 0);
+    test("abcde", 6, 0, "abcde", 0);
+    test("abcde", 6, 0, "abcdefghij", 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 0);
+    test("abcdefghij", 0, 0, "", 0);
+    test("abcdefghij", 0, 0, "abcde", -5);
+    test("abcdefghij", 0, 0, "abcdefghij", -10);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 0, 1, "", 1);
+    test("abcdefghij", 0, 1, "abcde", -4);
+    test("abcdefghij", 0, 1, "abcdefghij", -9);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", -19);
+    test("abcdefghij", 0, 5, "", 5);
+    test("abcdefghij", 0, 5, "abcde", 0);
+    test("abcdefghij", 0, 5, "abcdefghij", -5);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", -15);
+    test("abcdefghij", 0, 9, "", 9);
+    test("abcdefghij", 0, 9, "abcde", 4);
+    test("abcdefghij", 0, 9, "abcdefghij", -1);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", -11);
+    test("abcdefghij", 0, 10, "", 10);
+    test("abcdefghij", 0, 10, "abcde", 5);
+    test("abcdefghij", 0, 10, "abcdefghij", 0);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", -10);
+    test("abcdefghij", 0, 11, "", 10);
+    test("abcdefghij", 0, 11, "abcde", 5);
+    test("abcdefghij", 0, 11, "abcdefghij", 0);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", -10);
+    test("abcdefghij", 1, 0, "", 0);
+    test("abcdefghij", 1, 0, "abcde", -5);
+    test("abcdefghij", 1, 0, "abcdefghij", -10);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 1, 1, "", 1);
+    test("abcdefghij", 1, 1, "abcde", 1);
+    test("abcdefghij", 1, 1, "abcdefghij", 1);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 1);
+    test("abcdefghij", 1, 4, "", 4);
+    test("abcdefghij", 1, 4, "abcde", 1);
+    test("abcdefghij", 1, 4, "abcdefghij", 1);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 1);
+    test("abcdefghij", 1, 8, "", 8);
+    test("abcdefghij", 1, 8, "abcde", 1);
+    test("abcdefghij", 1, 8, "abcdefghij", 1);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 1);
+    test("abcdefghij", 1, 9, "", 9);
+    test("abcdefghij", 1, 9, "abcde", 1);
+    test("abcdefghij", 1, 9, "abcdefghij", 1);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 1);
+    test("abcdefghij", 1, 10, "", 9);
+    test("abcdefghij", 1, 10, "abcde", 1);
+    test("abcdefghij", 1, 10, "abcdefghij", 1);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 1);
+    test("abcdefghij", 5, 0, "", 0);
+    test("abcdefghij", 5, 0, "abcde", -5);
+    test("abcdefghij", 5, 0, "abcdefghij", -10);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 5, 1, "", 1);
+    test("abcdefghij", 5, 1, "abcde", 5);
+    test("abcdefghij", 5, 1, "abcdefghij", 5);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 5);
+    test("abcdefghij", 5, 2, "", 2);
+    test("abcdefghij", 5, 2, "abcde", 5);
+    test("abcdefghij", 5, 2, "abcdefghij", 5);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 5);
+    test("abcdefghij", 5, 4, "", 4);
+    test("abcdefghij", 5, 4, "abcde", 5);
+    test("abcdefghij", 5, 4, "abcdefghij", 5);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 5);
+    test("abcdefghij", 5, 5, "", 5);
+    test("abcdefghij", 5, 5, "abcde", 5);
+    test("abcdefghij", 5, 5, "abcdefghij", 5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 5);
+    test("abcdefghij", 5, 6, "", 5);
+    test("abcdefghij", 5, 6, "abcde", 5);
+    test("abcdefghij", 5, 6, "abcdefghij", 5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 5);
+    test("abcdefghij", 9, 0, "", 0);
+    test("abcdefghij", 9, 0, "abcde", -5);
+    test("abcdefghij", 9, 0, "abcdefghij", -10);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 9, 1, "", 1);
+    test("abcdefghij", 9, 1, "abcde", 9);
+    test("abcdefghij", 9, 1, "abcdefghij", 9);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 9);
+    test("abcdefghij", 9, 2, "", 1);
+    test("abcdefghij", 9, 2, "abcde", 9);
+    test("abcdefghij", 9, 2, "abcdefghij", 9);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 9);
+    test("abcdefghij", 10, 0, "", 0);
+    test("abcdefghij", 10, 0, "abcde", -5);
+    test("abcdefghij", 10, 0, "abcdefghij", -10);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 10, 1, "", 0);
+    test("abcdefghij", 10, 1, "abcde", -5);
+    test("abcdefghij", 10, 1, "abcdefghij", -10);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 11, 0, "", 0);
+    test("abcdefghij", 11, 0, "abcde", 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 0);
+}
+
+void test2()
+{
+    test("abcdefghijklmnopqrst", 0, 0, "", 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", -5);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 0, 1, "", 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", -4);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", -9);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", -19);
+    test("abcdefghijklmnopqrst", 0, 10, "", 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 5);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 0);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", -10);
+    test("abcdefghijklmnopqrst", 0, 19, "", 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 14);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 9);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", -1);
+    test("abcdefghijklmnopqrst", 0, 20, "", 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 15);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 0);
+    test("abcdefghijklmnopqrst", 0, 21, "", 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 15);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 0);
+    test("abcdefghijklmnopqrst", 1, 0, "", 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", -5);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 1, 1, "", 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 1);
+    test("abcdefghijklmnopqrst", 1, 9, "", 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 1);
+    test("abcdefghijklmnopqrst", 1, 18, "", 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 1);
+    test("abcdefghijklmnopqrst", 1, 19, "", 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 1);
+    test("abcdefghijklmnopqrst", 1, 20, "", 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 1);
+    test("abcdefghijklmnopqrst", 10, 0, "", 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", -5);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 10, 1, "", 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 10);
+    test("abcdefghijklmnopqrst", 10, 5, "", 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 10);
+    test("abcdefghijklmnopqrst", 10, 9, "", 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 10);
+    test("abcdefghijklmnopqrst", 10, 10, "", 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 10);
+    test("abcdefghijklmnopqrst", 10, 11, "", 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 10);
+    test("abcdefghijklmnopqrst", 19, 0, "", 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", -5);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 19, 1, "", 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 19);
+    test("abcdefghijklmnopqrst", 19, 2, "", 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 19);
+    test("abcdefghijklmnopqrst", 20, 0, "", 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", -5);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 20, 1, "", 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", -5);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 21, 0, "", 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 0);
+}
+
+
+int main () {
+    test0();
+    test1();
+    test2();
+    
+    {
+    test("abcde", 5, 1, "", 0);
+    test("abcde", 2, 4, "", 3);
+    test("abcde", 2, 4, "abcde", 2);
+    test("ABCde", 2, 4, "abcde", -1);
+    }
+
+    {
+    test(L"abcde", 5, 1, L"", 0);
+    test(L"abcde", 2, 4, L"", 3);
+    test(L"abcde", 2, 4, L"abcde", 2);
+    test(L"ABCde", 2, 4, L"abcde", -1);
+    }
+
+#if __cplusplus >= 201103L
+    {
+    test(u"abcde", 5, 1, u"", 0);
+    test(u"abcde", 2, 4, u"", 3);
+    test(u"abcde", 2, 4, u"abcde", 2);
+    test(u"ABCde", 2, 4, u"abcde", -1);
+    }
+
+    {
+    test(U"abcde", 5, 1, U"", 0);
+    test(U"abcde", 2, 4, U"", 3);
+    test(U"abcde", 2, 4, U"abcde", 2);
+    test(U"ABCde", 2, 4, U"abcde", -1);
+    }
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1 { "abcde", 5 };
+    constexpr SV  sv2 { "abcde", 0 };
+    static_assert ( sv1.compare(5, 1, sv2) == 0, "" );
+    static_assert ( sv1.compare(2, 4, sv2) == 1, "" );
+    }
+#endif
+}

test/experimental/string.view/string.view.ops/compare.sv.pass.cpp

@@ -0,0 +1,121 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+// constexpr int compare(basic_string_view str) const noexcept;
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+int sign ( int x ) { return x > 0 ? 1 : ( x < 0 ? -1 : 0 ); }
+
+template<typename CharT>
+void test1 ( std::experimental::basic_string_view<CharT> sv1, 
+            std::experimental::basic_string_view<CharT> sv2, int expected ) {
+    assert ( sign( sv1.compare(sv2)) == sign(expected));
+}
+
+
+template<typename CharT>
+void test ( const CharT *s1, const CharT  *s2, int expected ) {
+    typedef std::experimental::basic_string_view<CharT> string_view_t;
+    
+    string_view_t sv1 ( s1 );
+    string_view_t sv2 ( s2 );
+    test1(sv1, sv2, expected);
+}
+
+int main () {
+
+    test("",                     "", 0);
+    test("",                     "abcde", -5);
+    test("",                     "abcdefghij", -10);
+    test("",                     "abcdefghijklmnopqrst", -20);
+    test("abcde",                "", 5);
+    test("abcde",                "abcde", 0);
+    test("abcde",                "abcdefghij", -5);
+    test("abcde",                "abcdefghijklmnopqrst", -15);
+    test("abcdefghij",           "", 10);
+    test("abcdefghij",           "abcde", 5);
+    test("abcdefghij",           "abcdefghij", 0);
+    test("abcdefghij",           "abcdefghijklmnopqrst", -10);
+    test("abcdefghijklmnopqrst", "", 20);
+    test("abcdefghijklmnopqrst", "abcde", 15);
+    test("abcdefghijklmnopqrst", "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", "abcdefghijklmnopqrst", 0);
+
+    test(L"",                     L"", 0);
+    test(L"",                     L"abcde", -5);
+    test(L"",                     L"abcdefghij", -10);
+    test(L"",                     L"abcdefghijklmnopqrst", -20);
+    test(L"abcde",                L"", 5);
+    test(L"abcde",                L"abcde", 0);
+    test(L"abcde",                L"abcdefghij", -5);
+    test(L"abcde",                L"abcdefghijklmnopqrst", -15);
+    test(L"abcdefghij",           L"", 10);
+    test(L"abcdefghij",           L"abcde", 5);
+    test(L"abcdefghij",           L"abcdefghij", 0);
+    test(L"abcdefghij",           L"abcdefghijklmnopqrst", -10);
+    test(L"abcdefghijklmnopqrst", L"", 20);
+    test(L"abcdefghijklmnopqrst", L"abcde", 15);
+    test(L"abcdefghijklmnopqrst", L"abcdefghij", 10);
+    test(L"abcdefghijklmnopqrst", L"abcdefghijklmnopqrst", 0);
+
+#if __cplusplus >= 201103L
+    test(u"",                     u"", 0);
+    test(u"",                     u"abcde", -5);
+    test(u"",                     u"abcdefghij", -10);
+    test(u"",                     u"abcdefghijklmnopqrst", -20);
+    test(u"abcde",                u"", 5);
+    test(u"abcde",                u"abcde", 0);
+    test(u"abcde",                u"abcdefghij", -5);
+    test(u"abcde",                u"abcdefghijklmnopqrst", -15);
+    test(u"abcdefghij",           u"", 10);
+    test(u"abcdefghij",           u"abcde", 5);
+    test(u"abcdefghij",           u"abcdefghij", 0);
+    test(u"abcdefghij",           u"abcdefghijklmnopqrst", -10);
+    test(u"abcdefghijklmnopqrst", u"", 20);
+    test(u"abcdefghijklmnopqrst", u"abcde", 15);
+    test(u"abcdefghijklmnopqrst", u"abcdefghij", 10);
+    test(u"abcdefghijklmnopqrst", u"abcdefghijklmnopqrst", 0);
+
+    test(U"",                     U"", 0);
+    test(U"",                     U"abcde", -5);
+    test(U"",                     U"abcdefghij", -10);
+    test(U"",                     U"abcdefghijklmnopqrst", -20);
+    test(U"abcde",                U"", 5);
+    test(U"abcde",                U"abcde", 0);
+    test(U"abcde",                U"abcdefghij", -5);
+    test(U"abcde",                U"abcdefghijklmnopqrst", -15);
+    test(U"abcdefghij",           U"", 10);
+    test(U"abcdefghij",           U"abcde", 5);
+    test(U"abcdefghij",           U"abcdefghij", 0);
+    test(U"abcdefghij",           U"abcdefghijklmnopqrst", -10);
+    test(U"abcdefghijklmnopqrst", U"", 20);
+    test(U"abcdefghijklmnopqrst", U"abcde", 15);
+    test(U"abcdefghijklmnopqrst", U"abcdefghij", 10);
+    test(U"abcdefghijklmnopqrst", U"abcdefghijklmnopqrst", 0);
+#endif
+    
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1 { "abcde", 5 };
+    constexpr SV  sv2 { "abcde", 5 };
+    constexpr SV  sv3 { "edcba0", 6 };
+    static_assert ( sv1.compare(sv2) == 0, "" );
+    static_assert ( sv2.compare(sv1) == 0, "" );
+    static_assert ( sv3.compare(sv2)  > 0, "" );
+    static_assert ( sv2.compare(sv3)  < 0, "" );
+    }
+#endif    
+}

test/experimental/string.view/string.view.ops/copy.pass.cpp

@@ -0,0 +1,92 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// size_type copy(charT* s, size_type n, size_type pos = 0) const;
+
+// Throws: out_of_range if pos > size().
+// Remarks: Let rlen be the smaller of n and size() - pos.
+// Requires: [s, s+rlen) is a valid range.
+// Effects: Equivalent to std::copy_n(begin() + pos, rlen, s).
+// Returns: rlen.
+
+
+#include <experimental/string_view>
+#include <cassert>
+
+template<typename CharT>
+void test1 ( std::experimental::basic_string_view<CharT> sv, size_t n, size_t pos ) {
+    const size_t rlen = std::min ( n, sv.size() - pos );
+
+    CharT *dest1 = new CharT [rlen + 1];    dest1[rlen] = 0;
+    CharT *dest2 = new CharT [rlen + 1];    dest2[rlen] = 0;
+    
+    try {
+        sv.copy(dest1, n, pos);
+        std::copy_n(sv.begin() + pos, rlen, dest2);
+
+        for ( size_t i = 0; i <= rlen; ++i )
+            assert ( dest1[i] == dest2[i] );
+        }
+    catch ( const std::out_of_range & ) { assert ( pos > sv.size()); }
+    delete [] dest1;
+    delete [] dest2;    
+}
+
+
+template<typename CharT>
+void test ( const CharT *s ) {
+    typedef std::experimental::basic_string_view<CharT> string_view_t;
+    
+    string_view_t sv1 ( s );
+
+    test1(sv1,  0, 0);
+    test1(sv1,  1, 0);
+    test1(sv1, 20, 0);
+    test1(sv1, sv1.size(), 0);
+    test1(sv1, 20, string_view_t::npos);
+    
+    test1(sv1,   0, 3);
+    test1(sv1,   2, 3);
+    test1(sv1, 100, 3);
+    test1(sv1, 100, string_view_t::npos);
+
+    test1(sv1, sv1.size(), string_view_t::npos);
+
+    test1(sv1, sv1.size() + 1, 0);
+    test1(sv1, sv1.size() + 1, 1);
+    test1(sv1, sv1.size() + 1, string_view_t::npos);
+
+}
+
+int main () {
+    test ( "ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( "ABCDE");
+    test ( "a" );
+    test ( "" );
+
+    test ( L"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( L"ABCDE" );
+    test ( L"a" );
+    test ( L"" );
+
+#if __cplusplus >= 201103L
+    test ( u"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( u"ABCDE" );
+    test ( u"a" );
+    test ( u"" );
+
+    test ( U"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( U"ABCDE" );
+    test ( U"a" );
+    test ( U"" );
+#endif
+}

test/experimental/string.view/string.view.ops/substr.pass.cpp

@@ -0,0 +1,107 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// constexpr basic_string_view substr(size_type pos = 0, size_type n = npos) const;
+
+// Throws: out_of_range if pos > size().
+// Effects: Determines the effective length rlen of the string to reference as the smaller of n and size() - pos.
+// Returns: basic_string_view(data()+pos, rlen).
+
+#include <experimental/string_view>
+#include <cassert>
+
+template<typename CharT>
+void test1 ( std::experimental::basic_string_view<CharT> sv, size_t n, size_t pos ) {
+    try {
+        std::experimental::basic_string_view<CharT> sv1 = sv.substr(pos, n);
+        const size_t rlen = std::min ( n, sv.size() - pos );
+        assert ( sv1.size() == rlen );
+        for ( size_t i = 0; i <= rlen; ++i )
+            assert ( sv[pos+i] == sv1[i] );
+        }
+    catch ( const std::out_of_range & ) { assert ( pos > sv.size()); }
+}
+
+
+template<typename CharT>
+void test ( const CharT *s ) {
+    typedef std::experimental::basic_string_view<CharT> string_view_t;
+    
+    string_view_t sv1 ( s );
+
+    test1(sv1,  0, 0);
+    test1(sv1,  1, 0);
+    test1(sv1, 20, 0);
+    test1(sv1, sv1.size(), 0);
+    
+    test1(sv1,   0, 3);
+    test1(sv1,   2, 3);
+    test1(sv1, 100, 3);
+
+    test1(sv1, 0, string_view_t::npos);
+    test1(sv1, 2, string_view_t::npos);
+    test1(sv1, sv1.size(), string_view_t::npos);
+
+    test1(sv1, sv1.size() + 1, 0);
+    test1(sv1, sv1.size() + 1, 1);
+    test1(sv1, sv1.size() + 1, string_view_t::npos);
+}
+
+int main () {
+    test ( "ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( "ABCDE");
+    test ( "a" );
+    test ( "" );
+
+    test ( L"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( L"ABCDE" );
+    test ( L"a" );
+    test ( L"" );
+
+#if __cplusplus >= 201103L
+    test ( u"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( u"ABCDE" );
+    test ( u"a" );
+    test ( u"" );
+
+    test ( U"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( U"ABCDE" );
+    test ( U"a" );
+    test ( U"" );
+#endif
+    
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr std::experimental::string_view sv1 { "ABCDE", 5 };
+
+    {
+    constexpr std::experimental::string_view sv2 = sv1.substr ( 0, 3 );
+    static_assert ( sv2.size() == 3, "" );
+    static_assert ( sv2[0] == 'A', "" );
+    static_assert ( sv2[1] == 'B', "" );
+    static_assert ( sv2[2] == 'C', "" );
+    }
+    
+    {
+    constexpr std::experimental::string_view sv2 = sv1.substr ( 3, 0 );
+    static_assert ( sv2.size() == 0, "" );
+    }
+
+    {
+    constexpr std::experimental::string_view sv2 = sv1.substr ( 3, 3 );
+    static_assert ( sv2.size() == 2, "" );
+    static_assert ( sv2[0] == 'D', "" );
+    static_assert ( sv2[1] == 'E', "" );
+    }
+    }
+#endif
+}

test/experimental/string.view/string.view.ops/to_string.pass.cpp

@@ -0,0 +1,77 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+//  template<class Allocator>
+//  explicit operator basic_string<_CharT, _Traits, Allocator> () const;
+//  template<class _CharT, class _Traits = char_traits<_CharT>, class Allocator = allocator<_CharT> >
+//  basic_string<_CharT, _Traits, Allocator> to_string (
+//          basic_string_view<_CharT, _Traits> _sv, const Allocator& _a = Allocator()) const;
+
+#include <experimental/string_view>
+#include <cassert>
+#include "min_allocator.h"
+
+template<typename CharT>
+void test ( const CharT *s ) {
+    typedef std::basic_string<CharT> String ;
+    {
+    std::experimental::basic_string_view<CharT> sv1 ( s );
+    String                                      str1 = (String) sv1;
+    
+    assert ( sv1.size() == str1.size ());
+    assert ( std::char_traits<CharT>::compare ( sv1.data(), str1.data(),  sv1.size()) == 0 );
+
+#if __cplusplus >= 201103L
+    auto str2 = sv1.to_string(min_allocator<CharT>());
+    assert ( sv1.size() == str2.size ());
+    assert ( std::char_traits<CharT>::compare ( sv1.data(), str2.data(), sv1.size()) == 0 );
+#endif
+    }
+
+    {
+    std::experimental::basic_string_view<CharT> sv1;
+    String                                      str1 = (String) sv1;
+
+    assert ( sv1.size() == str1.size ());
+    assert ( std::char_traits<CharT>::compare ( sv1.data(), str1.data(), sv1.size()) == 0 );
+
+#if __cplusplus >= 201103L
+    auto str2 = sv1.to_string(min_allocator<CharT>());
+    assert ( sv1.size() == str2.size ());
+    assert ( std::char_traits<CharT>::compare ( sv1.data(), str2.data(), sv1.size()) == 0 );
+#endif
+    }
+}
+
+int main () {
+    test ( "ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( "ABCDE");
+    test ( "a" );
+    test ( "" );
+
+    test ( L"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( L"ABCDE" );
+    test ( L"a" );
+    test ( L"" );
+
+#if __cplusplus >= 201103L
+    test ( u"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( u"ABCDE" );
+    test ( u"a" );
+    test ( u"" );
+
+    test ( U"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( U"ABCDE" );
+    test ( U"a" );
+    test ( U"" );
+#endif
+}

test/experimental/string.view/string.view.synop/nothing_to_do.pass.cpp

@@ -0,0 +1,12 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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/string_view>
+
+int main () {}

test/experimental/string.view/string.view.template/nothing_to_do.pass.cpp

@@ -0,0 +1,12 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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/string_view>
+
+int main () {}