1fe6060f1SDimitry Andric // -*- C++ -*- 2fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 3fe6060f1SDimitry Andric // 4fe6060f1SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5fe6060f1SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 6fe6060f1SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7fe6060f1SDimitry Andric // 8fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 9fe6060f1SDimitry Andric 10fe6060f1SDimitry Andric #ifndef _LIBCPP___ITERATOR_SIZE_H 11fe6060f1SDimitry Andric #define _LIBCPP___ITERATOR_SIZE_H 12fe6060f1SDimitry Andric 13fe6060f1SDimitry Andric #include <__config> 14bdd1243dSDimitry Andric #include <__type_traits/common_type.h> 15bdd1243dSDimitry Andric #include <__type_traits/make_signed.h> 16fe6060f1SDimitry Andric #include <cstddef> 17fe6060f1SDimitry Andric 18fe6060f1SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19fe6060f1SDimitry Andric # pragma GCC system_header 20fe6060f1SDimitry Andric #endif 21fe6060f1SDimitry Andric 22fe6060f1SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 23fe6060f1SDimitry Andric 2406c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 17 25fe6060f1SDimitry Andric 26fe6060f1SDimitry Andric template <class _Cont> 27*0fca6ea1SDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr auto size(const _Cont& __c) noexcept(noexcept(__c.size())) -> decltype(__c.size()) { 28cb14a3feSDimitry Andric return __c.size(); 29cb14a3feSDimitry Andric } 30fe6060f1SDimitry Andric 31fe6060f1SDimitry Andric template <class _Tp, size_t _Sz> 32cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr size_t size(const _Tp (&)[_Sz]) noexcept { 33cb14a3feSDimitry Andric return _Sz; 34cb14a3feSDimitry Andric } 35fe6060f1SDimitry Andric 3606c3fb27SDimitry Andric # if _LIBCPP_STD_VER >= 20 37fe6060f1SDimitry Andric template <class _Cont> 38*0fca6ea1SDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr auto 39*0fca6ea1SDimitry Andric ssize(const _Cont& __c) noexcept(noexcept(static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>( 40*0fca6ea1SDimitry Andric __c.size()))) -> common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>> { 41cb14a3feSDimitry Andric return static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size()); 42cb14a3feSDimitry Andric } 43fe6060f1SDimitry Andric 4481ad6265SDimitry Andric // GCC complains about the implicit conversion from ptrdiff_t to size_t in 4581ad6265SDimitry Andric // the array bound. 4681ad6265SDimitry Andric _LIBCPP_DIAGNOSTIC_PUSH 4781ad6265SDimitry Andric _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wsign-conversion") 48fe6060f1SDimitry Andric template <class _Tp, ptrdiff_t _Sz> 49cb14a3feSDimitry Andric _LIBCPP_HIDE_FROM_ABI constexpr ptrdiff_t ssize(const _Tp (&)[_Sz]) noexcept { 50cb14a3feSDimitry Andric return _Sz; 51cb14a3feSDimitry Andric } 5281ad6265SDimitry Andric _LIBCPP_DIAGNOSTIC_POP 53fe6060f1SDimitry Andric # endif 54fe6060f1SDimitry Andric 5506c3fb27SDimitry Andric #endif // _LIBCPP_STD_VER >= 17 56fe6060f1SDimitry Andric 57fe6060f1SDimitry Andric _LIBCPP_END_NAMESPACE_STD 58fe6060f1SDimitry Andric 59fe6060f1SDimitry Andric #endif // _LIBCPP___ITERATOR_SIZE_H 60