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_PUSH_MACROS 22 #include <__undef_macros> 23 24 _LIBCPP_BEGIN_NAMESPACE_STD 25 26 #if _LIBCPP_STD_VER > 14 27 28 template <class _Cont> 29 _LIBCPP_INLINE_VISIBILITY 30 constexpr auto size(const _Cont& __c) 31 _NOEXCEPT_(noexcept(__c.size())) 32 -> decltype (__c.size()) 33 { return __c.size(); } 34 35 template <class _Tp, size_t _Sz> 36 _LIBCPP_INLINE_VISIBILITY 37 constexpr size_t size(const _Tp (&)[_Sz]) noexcept { return _Sz; } 38 39 #if _LIBCPP_STD_VER > 17 40 template <class _Cont> 41 _LIBCPP_INLINE_VISIBILITY 42 constexpr auto ssize(const _Cont& __c) 43 _NOEXCEPT_(noexcept(static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size()))) 44 -> common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>> 45 { return static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size()); } 46 47 template <class _Tp, ptrdiff_t _Sz> 48 _LIBCPP_INLINE_VISIBILITY 49 constexpr ptrdiff_t ssize(const _Tp (&)[_Sz]) noexcept { return _Sz; } 50 #endif 51 52 #endif // _LIBCPP_STD_VER > 14 53 54 _LIBCPP_END_NAMESPACE_STD 55 56 _LIBCPP_POP_MACROS 57 58 #endif // _LIBCPP___ITERATOR_SIZE_H 59