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Implement LWG Paper n3887: Consistent Metafunction Aliases. This adds std::tuple_element_t<> as an alias for tuple_element<>::type. Clean up the synopsis for tuple_element in <utility> as well.

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@202673 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2014-03-03 06:18:11 +00:00
parent 3fef95b10d
commit 50fe0c7d61
4 changed files with 28 additions and 14 deletions
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9
include/tuple
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@@ -82,13 +82,15 @@ template <class T> class tuple_size; // undefined
template <class... T> class tuple_size<tuple<T...>>;
template <intsize_t I, class T> class tuple_element; // undefined
template <intsize_t I, class... T> class tuple_element<I, tuple<T...>>;
template <size_t _Ip, class ..._Tp>
using tuple_element_t = typename tuple_element <_Ip, _Tp...>::type; // C++14
// 20.4.1.5, element access:
template <intsize_t I, class... T>
typename tuple_element<I, tuple<T...>>::type&
get(tuple<T...>&) noexcept; // constexpr in C++14
template <intsize_t I, class... T>
typename tuple_element<I, tuple<T...>>::type const&
typename const tuple_element<I, tuple<T...>>::type &
get(const tuple<T...>&) noexcept; // constexpr in C++14
template <intsize_t I, class... T>
typename tuple_element<I, tuple<T...>>::type&&
@@ -152,6 +154,11 @@ public:
typedef typename tuple_element<_Ip, __tuple_types<_Tp...> >::type type;
};
#if _LIBCPP_STD_VER > 11
template <size_t _Ip, class ..._Tp>
using tuple_element_t = typename tuple_element <_Ip, _Tp...>::type;
#endif
// __tuple_leaf
template <size_t _Ip, class _Hp, bool=is_empty<_Hp>::value