1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___ITERATOR_SIZE_H 11 #define _LIBCPP___ITERATOR_SIZE_H 12 13 #include <__config> 14 #include <cstddef> 15 #include <type_traits> 16 17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18 #pragma GCC system_header 19 #endif 20 21 _LIBCPP_BEGIN_NAMESPACE_STD 22 23 #if _LIBCPP_STD_VER > 14 24 25 template <class _Cont> 26 _LIBCPP_INLINE_VISIBILITY 27 constexpr auto size(const _Cont& __c) 28 _NOEXCEPT_(noexcept(__c.size())) 29 -> decltype (__c.size()) 30 { return __c.size(); } 31 32 template <class _Tp, size_t _Sz> 33 _LIBCPP_INLINE_VISIBILITY 34 constexpr size_t size(const _Tp (&)[_Sz]) noexcept { return _Sz; } 35 36 #if _LIBCPP_STD_VER > 17 37 template <class _Cont> 38 _LIBCPP_INLINE_VISIBILITY 39 constexpr auto ssize(const _Cont& __c) 40 _NOEXCEPT_(noexcept(static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size()))) 41 -> common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>> 42 { return static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size()); } 43 44 template <class _Tp, ptrdiff_t _Sz> 45 _LIBCPP_INLINE_VISIBILITY 46 constexpr ptrdiff_t ssize(const _Tp (&)[_Sz]) noexcept { return _Sz; } 47 #endif 48 49 #endif // _LIBCPP_STD_VER > 14 50 51 _LIBCPP_END_NAMESPACE_STD 52 53 #endif // _LIBCPP___ITERATOR_SIZE_H 54