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Implement N4280 - 'Non-member size() and more'

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@222378 91177308-0d34-0410-b5e6-96231b3b80d8
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Marshall Clow
2014-11-19 19:43:23 +00:00
parent ab5bd89de1
commit 03c6791dc6
5 changed files with 284 additions and 7 deletions
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41
include/iterator
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@@ -324,6 +324,17 @@ template <class T, size_t N> reverse_iterator<T*> rend(T (&array)[N]); //
template <class C> auto crbegin(const C& c) -> decltype(std::rbegin(c)); // C++14
template <class C> auto crend(const C& c) -> decltype(std::rend(c)); // C++14
// 24.8, container access:
template <class C> constexpr auto size(const C& c) -> decltype(c.size()); // C++17
template <class T, size_t N> constexpr size_t size(const T (&array)[N]) noexcept; // C++17
template <class C> constexpr auto empty(const C& c) -> decltype(c.empty()); // C++17
template <class T, size_t N> constexpr bool empty(const T (&array)[N]) noexcept; // C++17
template <class E> constexpr bool empty(initializer_list<E> il) noexcept; // C++17
template <class C> constexpr auto data(C& c) -> decltype(c.data()); // C++17
template <class C> constexpr auto data(const C& c) -> decltype(c.data()); // C++17
template <class T, size_t N> constexpr T* data(T (&array)[N]) noexcept; // C++17
template <class E> constexpr const E* data(initializer_list<E> il) noexcept; // C++17
} // std
*/
@@ -1568,6 +1579,36 @@ end(const _Cp& __c)
#endif // !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_TRAILING_RETURN)
#if _LIBCPP_STD_VER > 14
template <class _C>
constexpr auto size(const _C& __c) -> decltype(__c.size()) { return __c.size(); }
template <class _Tp, size_t _N>
constexpr size_t size(const _Tp (&__array)[_N]) noexcept { return _N; }
template <class _C>
constexpr auto empty(const _C& __c) -> decltype(__c.empty()) { return __c.empty(); }
template <class _Tp, size_t _N>
constexpr bool empty(const _Tp (&__array)[_N]) noexcept { return false; }
template <class _Ep>
constexpr bool empty(initializer_list<_Ep> __il) noexcept { return __il.size() == 0; }
template <class _C> constexpr
auto data(_C& __c) -> decltype(__c.data()) { return __c.data(); }
template <class _C> constexpr
auto data(const _C& __c) -> decltype(__c.data()) { return __c.data(); }
template <class _Tp, size_t _N>
constexpr _Tp* data(_Tp (&__array)[_N]) noexcept { return __array; }
template <class _Ep>
constexpr const _Ep* data(initializer_list<_Ep> __il) noexcept { return __il.begin(); }
#endif
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_ITERATOR