Make std::get constexpr

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@186525 91177308-0d34-0410-b5e6-96231b3b80d8

include/__tuple

@@ -79,47 +79,47 @@ template <class _T1, class _T2> struct __tuple_like<pair<_T1, _T2> > : true_type
 template <class _Tp, size_t _Size> struct __tuple_like<array<_Tp, _Size> > : true_type {};
 
 template <size_t _Ip, class ..._Tp>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 typename tuple_element<_Ip, tuple<_Tp...> >::type&
 get(tuple<_Tp...>&) _NOEXCEPT;
 
 template <size_t _Ip, class ..._Tp>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 const typename tuple_element<_Ip, tuple<_Tp...> >::type&
 get(const tuple<_Tp...>&) _NOEXCEPT;
 
 template <size_t _Ip, class ..._Tp>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 typename tuple_element<_Ip, tuple<_Tp...> >::type&&
 get(tuple<_Tp...>&&) _NOEXCEPT;
 
 template <size_t _Ip, class _T1, class _T2>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 typename tuple_element<_Ip, pair<_T1, _T2> >::type&
 get(pair<_T1, _T2>&) _NOEXCEPT;
 
 template <size_t _Ip, class _T1, class _T2>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
 get(const pair<_T1, _T2>&) _NOEXCEPT;
 
 template <size_t _Ip, class _T1, class _T2>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
 get(pair<_T1, _T2>&&) _NOEXCEPT;
 
 template <size_t _Ip, class _Tp, size_t _Size>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 _Tp&
 get(array<_Tp, _Size>&) _NOEXCEPT;
 
 template <size_t _Ip, class _Tp, size_t _Size>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 const _Tp&
 get(const array<_Tp, _Size>&) _NOEXCEPT;
 
 template <size_t _Ip, class _Tp, size_t _Size>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 _Tp&&
 get(array<_Tp, _Size>&&) _NOEXCEPT;
 

include/array

@@ -59,14 +59,14 @@ struct array
 
     // element access:
     reference operator[](size_type n);
-    const_reference operator[](size_type n) const;
+    const_reference operator[](size_type n) const; // constexpr in C++14
-    const_reference at(size_type n) const;
+    const_reference at(size_type n) const; // constexpr in C++14
     reference at(size_type n);
 
     reference front();
-    const_reference front() const;
+    const_reference front() const; // constexpr in C++14
     reference back();
-    const_reference back() const;
+    const_reference back() const; // constexpr in C++14
 
     T* data() noexcept;
     const T* data() const noexcept;
@@ -92,9 +92,9 @@ template <class T> class tuple_size;
 template <int I, class T> class tuple_element;
 template <class T, size_t N> struct tuple_size<array<T, N>>;
 template <int I, class T, size_t N> struct tuple_element<I, array<T, N>>;
-template <int I, class T, size_t N> T& get(array<T, N>&) noexcept;
+template <int I, class T, size_t N> T& get(array<T, N>&) noexcept; // constexpr in C++14
-template <int I, class T, size_t N> const T& get(const array<T, N>&) noexcept;
+template <int I, class T, size_t N> const T& get(const array<T, N>&) noexcept; // constexpr in C++14
-template <int I, class T, size_t N> T&& get(array<T, N>&&) noexcept;
+template <int I, class T, size_t N> T&& get(array<T, N>&&) noexcept; // constexpr in C++14
 
 }  // std
 
@@ -181,14 +181,14 @@ struct _LIBCPP_TYPE_VIS array
 
     // element access:
     _LIBCPP_INLINE_VISIBILITY reference operator[](size_type __n)             {return __elems_[__n];}
-    _LIBCPP_INLINE_VISIBILITY const_reference operator[](size_type __n) const {return __elems_[__n];}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const_reference operator[](size_type __n) const {return __elems_[__n];}
     reference at(size_type __n);
-    const_reference at(size_type __n) const;
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 const_reference at(size_type __n) const;
 
     _LIBCPP_INLINE_VISIBILITY reference front()             {return __elems_[0];}
-    _LIBCPP_INLINE_VISIBILITY const_reference front() const {return __elems_[0];}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const_reference front() const {return __elems_[0];}
     _LIBCPP_INLINE_VISIBILITY reference back()              {return __elems_[_Size > 0 ? _Size-1 : 0];}
-    _LIBCPP_INLINE_VISIBILITY const_reference back() const  {return __elems_[_Size > 0 ? _Size-1 : 0];}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const_reference back() const  {return __elems_[_Size > 0 ? _Size-1 : 0];}
 
     _LIBCPP_INLINE_VISIBILITY
     value_type* data() _NOEXCEPT {return __elems_;}
@@ -210,6 +210,7 @@ array<_Tp, _Size>::at(size_type __n)
 }
 
 template <class _Tp, size_t _Size>
+_LIBCPP_CONSTEXPR_AFTER_CXX11
 typename array<_Tp, _Size>::const_reference
 array<_Tp, _Size>::at(size_type __n) const
 {
@@ -306,32 +307,32 @@ public:
 };
 
 template <size_t _Ip, class _Tp, size_t _Size>
-_LIBCPP_INLINE_VISIBILITY inline
+_LIBCPP_INLINE_VISIBILITY inline _LIBCPP_CONSTEXPR_AFTER_CXX11
 _Tp&
 get(array<_Tp, _Size>& __a) _NOEXCEPT
 {
     static_assert(_Ip < _Size, "Index out of bounds in std::get<> (std::array)");
-    return __a[_Ip];
+    return __a.__elems_[_Ip];
 }
 
 template <size_t _Ip, class _Tp, size_t _Size>
-_LIBCPP_INLINE_VISIBILITY inline
+_LIBCPP_INLINE_VISIBILITY inline _LIBCPP_CONSTEXPR_AFTER_CXX11
 const _Tp&
 get(const array<_Tp, _Size>& __a) _NOEXCEPT
 {
     static_assert(_Ip < _Size, "Index out of bounds in std::get<> (const std::array)");
-    return __a[_Ip];
+    return __a.__elems_[_Ip];
 }
 
 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 
 template <size_t _Ip, class _Tp, size_t _Size>
-_LIBCPP_INLINE_VISIBILITY inline
+_LIBCPP_INLINE_VISIBILITY inline _LIBCPP_CONSTEXPR_AFTER_CXX11
 _Tp&&
 get(array<_Tp, _Size>&& __a) _NOEXCEPT
 {
     static_assert(_Ip < _Size, "Index out of bounds in std::get<> (std::array &&)");
-    return _VSTD::move(__a[_Ip]);
+    return _VSTD::move(__a.__elems_[_Ip]);
 }
 
 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES

include/tuple

@@ -86,13 +86,13 @@ template <intsize_t I, class... T> class tuple_element<I, tuple<T...>>;
 // 20.4.1.5, element access:
 template <intsize_t I, class... T>
     typename tuple_element<I, tuple<T...>>::type&
-    get(tuple<T...>&) noexcept;
+    get(tuple<T...>&) noexcept; // constexpr in C++14
 template <intsize_t I, class... T>
     typename tuple_element<I, tuple<T...>>::type const&
-    get(const tuple<T...>&) noexcept;
+    get(const tuple<T...>&) noexcept; // constexpr in C++14
 template <intsize_t I, class... T>
     typename tuple_element<I, tuple<T...>>::type&&
-    get(tuple<T...>&&) noexcept;
+    get(tuple<T...>&&) noexcept; // constexpr in C++14
 
 template <class T1, class... T>
     constexpr T1& get(tuple<T...>&) noexcept;  // C++14
@@ -546,11 +546,11 @@ class _LIBCPP_TYPE_VIS tuple
 
     base base_;
 
-    template <size_t _Jp, class ..._Up> friend
+    template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11
         typename tuple_element<_Jp, tuple<_Up...> >::type& get(tuple<_Up...>&) _NOEXCEPT;
-    template <size_t _Jp, class ..._Up> friend
+    template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11
         const typename tuple_element<_Jp, tuple<_Up...> >::type& get(const tuple<_Up...>&) _NOEXCEPT;
-    template <size_t _Jp, class ..._Up> friend
+    template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11
         typename tuple_element<_Jp, tuple<_Up...> >::type&& get(tuple<_Up...>&&) _NOEXCEPT;
 public:
 
@@ -763,7 +763,7 @@ swap(tuple<_Tp...>& __t, tuple<_Tp...>& __u)
 // get
 
 template <size_t _Ip, class ..._Tp>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 typename tuple_element<_Ip, tuple<_Tp...> >::type&
 get(tuple<_Tp...>& __t) _NOEXCEPT
 {
@@ -772,7 +772,7 @@ get(tuple<_Tp...>& __t) _NOEXCEPT
 }
 
 template <size_t _Ip, class ..._Tp>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 const typename tuple_element<_Ip, tuple<_Tp...> >::type&
 get(const tuple<_Tp...>& __t) _NOEXCEPT
 {
@@ -781,7 +781,7 @@ get(const tuple<_Tp...>& __t) _NOEXCEPT
 }
 
 template <size_t _Ip, class ..._Tp>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 typename tuple_element<_Ip, tuple<_Tp...> >::type&&
 get(tuple<_Tp...>&& __t) _NOEXCEPT
 {

include/utility

@@ -107,15 +107,15 @@ template <class T1, class T2> struct tuple_element<1, std::pair<T1, T2> >;
 
 template<size_t I, class T1, class T2>
     typename tuple_element<I, std::pair<T1, T2> >::type&
-    get(std::pair<T1, T2>&) noexcept;
+    get(std::pair<T1, T2>&) noexcept; // constexpr in C++14
 
 template<size_t I, class T1, class T2>
     const typename const tuple_element<I, std::pair<T1, T2> >::type&
-    get(const std::pair<T1, T2>&) noexcept;
+    get(const std::pair<T1, T2>&) noexcept; // constexpr in C++14
 
 template<size_t I, class T1, class T2>
     typename tuple_element<I, std::pair<T1, T2> >::type&&
-    get(std::pair<T1, T2>&&) noexcept;
+    get(std::pair<T1, T2>&&) noexcept; // constexpr in C++14
 
 template<class T1, class T2>
     constexpr T1& get(std::pair<T1, T2>&) noexcept; // C++14
@@ -546,13 +546,13 @@ struct __get_pair<0>
 {
     template <class _T1, class _T2>
     static
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
     _T1&
     get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}
 
     template <class _T1, class _T2>
     static
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
     const _T1&
     get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}
 
@@ -560,7 +560,7 @@ struct __get_pair<0>
 
     template <class _T1, class _T2>
     static
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
     _T1&&
     get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T1>(__p.first);}
 
@@ -572,13 +572,13 @@ struct __get_pair<1>
 {
     template <class _T1, class _T2>
     static
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
     _T2&
     get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}
 
     template <class _T1, class _T2>
     static
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
     const _T2&
     get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}
 
@@ -586,7 +586,7 @@ struct __get_pair<1>
 
     template <class _T1, class _T2>
     static
-    _LIBCPP_INLINE_VISIBILITY
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
     _T2&&
     get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T2>(__p.second);}
 
@@ -594,7 +594,7 @@ struct __get_pair<1>
 };
 
 template <size_t _Ip, class _T1, class _T2>
-_LIBCPP_INLINE_VISIBILITY inline
+_LIBCPP_INLINE_VISIBILITY inline _LIBCPP_CONSTEXPR_AFTER_CXX11
 typename tuple_element<_Ip, pair<_T1, _T2> >::type&
 get(pair<_T1, _T2>& __p) _NOEXCEPT
 {
@@ -602,7 +602,7 @@ get(pair<_T1, _T2>& __p) _NOEXCEPT
 }
 
 template <size_t _Ip, class _T1, class _T2>
-_LIBCPP_INLINE_VISIBILITY inline
+_LIBCPP_INLINE_VISIBILITY inline _LIBCPP_CONSTEXPR_AFTER_CXX11
 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
 get(const pair<_T1, _T2>& __p) _NOEXCEPT
 {
@@ -612,7 +612,7 @@ get(const pair<_T1, _T2>& __p) _NOEXCEPT
 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 
 template <size_t _Ip, class _T1, class _T2>
-_LIBCPP_INLINE_VISIBILITY inline
+_LIBCPP_INLINE_VISIBILITY inline _LIBCPP_CONSTEXPR_AFTER_CXX11
 typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
 get(pair<_T1, _T2>&& __p) _NOEXCEPT
 {

test/containers/sequences/array/array.size/size.pass.cpp

@@ -21,12 +21,16 @@ int main()
         typedef std::array<T, 3> C;
         C c = {1, 2, 3.5};
         assert(c.size() == 3);
+        assert(c.max_size() == 3);
+        assert(!c.empty());
     }
     {
         typedef double T;
         typedef std::array<T, 0> C;
         C c = {};
         assert(c.size() == 0);
+        assert(c.max_size() == 0);
+        assert(c.empty());
     }
 #ifndef _LIBCPP_HAS_NO_CONSTEXPR
     {
@@ -34,12 +38,16 @@ int main()
         typedef std::array<T, 3> C;
         constexpr C c = {1, 2, 3.5};
         static_assert(c.size() == 3, "");
+        static_assert(c.max_size() == 3, "");
+        static_assert(!c.empty(), "");
     }
     {
         typedef double T;
         typedef std::array<T, 0> C;
         constexpr C c = {};
         static_assert(c.size() == 0, "");
+        static_assert(c.max_size() == 0, "");
+        static_assert(c.empty(), "");
     }
 #endif
 }

test/containers/sequences/array/array.tuple/get.pass.cpp

@@ -14,6 +14,16 @@
 #include <array>
 #include <cassert>
 
+#if __cplusplus > 201103L
+struct S {
+   std::array<int, 3> a;
+   int k;
+   constexpr S() : a{1,2,3}, k(std::get<2>(a)) {}
+   };
+
+constexpr std::array<int, 2> getArr () { return { 3, 4 }; }
+#endif
+
 int main()
 {
     {
@@ -25,4 +35,18 @@ int main()
         assert(c[1] == 5.5);
         assert(c[2] == 3.5);
     }
+#if _LIBCPP_STD_VER > 11
+    {
+        typedef double T;
+        typedef std::array<T, 3> C;
+        constexpr C c = {1, 2, 3.5};
+        static_assert(std::get<0>(c) == 1, "");
+        static_assert(std::get<1>(c) == 2, "");
+        static_assert(std::get<2>(c) == 3.5, "");
+    }
+    {
+        static_assert(S().k == 3, "");
+        static_assert(std::get<1>(getArr()) == 4, "");
+    }
+#endif
 }

test/containers/sequences/array/array.tuple/get_const.pass.cpp

@@ -24,4 +24,14 @@ int main()
         assert(std::get<1>(c) == 2);
         assert(std::get<2>(c) == 3.5);
     }
+#if _LIBCPP_STD_VER > 11
+    {
+        typedef double T;
+        typedef std::array<T, 3> C;
+        constexpr const C c = {1, 2, 3.5};
+        static_assert(std::get<0>(c) == 1, "");
+        static_assert(std::get<1>(c) == 2, "");
+        static_assert(std::get<2>(c) == 3.5, "");
+    }
+#endif
 }

test/containers/sequences/array/at.pass.cpp

@@ -0,0 +1,67 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <array>
+
+// reference operator[] (size_type)
+// const_reference operator[] (size_type); // constexpr in C++14
+// reference at (size_type)
+// const_reference at (size_type); // constexpr in C++14
+
+#include <array>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef double T;
+        typedef std::array<T, 3> C;
+        C c = {1, 2, 3.5};
+        C::reference r1 = c.at(0);
+        assert(r1 == 1);
+        r1 = 5.5;
+        assert(c.front() == 5.5);
+        
+        C::reference r2 = c.at(2);
+        assert(r2 == 3.5);
+        r2 = 7.5;
+        assert(c.back() == 7.5);
+
+        try { (void) c.at(3); }
+        catch (const std::out_of_range &) {}
+    }
+    {
+        typedef double T;
+        typedef std::array<T, 3> C;
+        const C c = {1, 2, 3.5};
+        C::const_reference r1 = c.at(0);
+        assert(r1 == 1);
+        
+        C::const_reference r2 = c.at(2);
+        assert(r2 == 3.5);
+
+        try { (void) c.at(3); }
+        catch (const std::out_of_range &) {}
+    }
+    
+#if _LIBCPP_STD_VER > 11 
+    {
+        typedef double T;
+        typedef std::array<T, 3> C;
+        constexpr C c = {1, 2, 3.5};
+
+        constexpr T t1 = c.at(0);
+        static_assert (t1 == 1, "");
+
+        constexpr T t2 = c.at(2);
+        static_assert (t2 == 3.5, "");
+    }
+#endif
+
+}

test/containers/sequences/array/front_back.pass.cpp

@@ -0,0 +1,62 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <array>
+
+// reference front();
+// reference back();
+// const_reference front(); // constexpr in C++14
+// const_reference back(); // constexpr in C++14
+
+#include <array>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef double T;
+        typedef std::array<T, 3> C;
+        C c = {1, 2, 3.5};
+
+        C::reference r1 = c.front();
+        assert(r1 == 1);
+        r1 = 5.5;
+        assert(c[0] == 5.5);
+        
+        C::reference r2 = c.back();
+        assert(r2 == 3.5);
+        r2 = 7.5;
+        assert(c[2] == 7.5);
+    }
+    {
+        typedef double T;
+        typedef std::array<T, 3> C;
+        const C c = {1, 2, 3.5};
+        C::const_reference r1 = c.front();
+        assert(r1 == 1);
+
+        C::const_reference r2 = c.back();
+        assert(r2 == 3.5);
+    }
+
+#if _LIBCPP_STD_VER > 11 
+    {
+        typedef double T;
+        typedef std::array<T, 3> C;
+        constexpr C c = {1, 2, 3.5};
+        
+        constexpr T t1 = c.front();
+        static_assert (t1 == 1, "");
+
+        constexpr T t2 = c.back();
+        static_assert (t2 == 3.5, "");
+    }
+#endif
+
+}

test/containers/sequences/array/indexing.pass.cpp

@@ -0,0 +1,60 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <array>
+
+// reference operator[] (size_type)
+// const_reference operator[] (size_type); // constexpr in C++14
+// reference at (size_type)
+// const_reference at (size_type); // constexpr in C++14
+
+#include <array>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef double T;
+        typedef std::array<T, 3> C;
+        C c = {1, 2, 3.5};
+        C::reference r1 = c[0];
+        assert(r1 == 1);
+        r1 = 5.5;
+        assert(c.front() == 5.5);
+        
+        C::reference r2 = c[2];
+        assert(r2 == 3.5);
+        r2 = 7.5;
+        assert(c.back() == 7.5);
+    }
+    {
+        typedef double T;
+        typedef std::array<T, 3> C;
+        const C c = {1, 2, 3.5};
+        C::const_reference r1 = c[0];
+        assert(r1 == 1);
+        C::const_reference r2 = c[2];
+        assert(r2 == 3.5);
+    }
+    
+#if _LIBCPP_STD_VER > 11 
+    {
+        typedef double T;
+        typedef std::array<T, 3> C;
+        constexpr C c = {1, 2, 3.5};
+        
+        constexpr T t1 = c[0];
+        static_assert (t1 == 1, "");
+
+        constexpr T t2 = c[2];
+        static_assert (t2 == 3.5, "");
+    }
+#endif
+
+}

test/utilities/utility/pairs/pair.astuple/get_const.pass.cpp

@@ -31,10 +31,8 @@ int main()
     {
         typedef std::pair<int, short> P;
         constexpr P p1(3, 4);
-        static_assert(p1.first == 3, "" ); // for now!
+        static_assert(std::get<0>(p1) == 3, "");
-        static_assert(p1.second == 4, "" ); // for now!
+        static_assert(std::get<1>(p1) == 4, "");
-//         static_assert(std::get<0>(p1) == 3, "");
-//         static_assert(std::get<1>(p1) == 4, "");
     }
 #endif
 }

test/utilities/utility/pairs/pair.astuple/get_non_const.pass.cpp

@@ -18,6 +18,16 @@
 #include <utility>
 #include <cassert>
 
+#if __cplusplus > 201103L
+struct S {
+   std::pair<int, int> a;
+   int k;
+   constexpr S() : a{1,2}, k(std::get<0>(a)) {}
+   };
+
+constexpr std::pair<int, int> getP () { return { 3, 4 }; }
+#endif
+
 int main()
 {
     {
@@ -30,4 +40,12 @@ int main()
         assert(std::get<0>(p) == 5);
         assert(std::get<1>(p) == 6);
     }
+
+#if __cplusplus > 201103L
+    {
+        static_assert(S().k == 1, "");
+        static_assert(std::get<1>(getP()) == 4, "");
+    }
+#endif
+
 }