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 <__type_traits/common_type.h> 15#include <__type_traits/make_signed.h> 16#include <cstddef> 17 18#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19# pragma GCC system_header 20#endif 21 22_LIBCPP_BEGIN_NAMESPACE_STD 23 24#if _LIBCPP_STD_VER > 14 25 26template <class _Cont> 27_LIBCPP_INLINE_VISIBILITY 28constexpr auto size(const _Cont& __c) 29_NOEXCEPT_(noexcept(__c.size())) 30-> decltype (__c.size()) 31{ return __c.size(); } 32 33template <class _Tp, size_t _Sz> 34_LIBCPP_INLINE_VISIBILITY 35constexpr size_t size(const _Tp (&)[_Sz]) noexcept { return _Sz; } 36 37#if _LIBCPP_STD_VER > 17 38template <class _Cont> 39_LIBCPP_INLINE_VISIBILITY 40constexpr auto ssize(const _Cont& __c) 41_NOEXCEPT_(noexcept(static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size()))) 42-> common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>> 43{ return static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size()); } 44 45// GCC complains about the implicit conversion from ptrdiff_t to size_t in 46// the array bound. 47_LIBCPP_DIAGNOSTIC_PUSH 48_LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wsign-conversion") 49template <class _Tp, ptrdiff_t _Sz> 50_LIBCPP_INLINE_VISIBILITY 51constexpr ptrdiff_t ssize(const _Tp (&)[_Sz]) noexcept { return _Sz; } 52_LIBCPP_DIAGNOSTIC_POP 53#endif 54 55#endif // _LIBCPP_STD_VER > 14 56 57_LIBCPP_END_NAMESPACE_STD 58 59#endif // _LIBCPP___ITERATOR_SIZE_H 60