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368faacac7
This commit reverts 5aaefa51 (and also partly 7f285f48e77 and b6d75682f9, which were related to the original commit). As landed, 5aaefa51 had unintended consequences on some downstream bots and didn't have proper coverage upstream due to a few subtle things. Implementing this is something we should do in libc++, however we'll first need to address a few issues listed in https://reviews.llvm.org/D106124#3349710. Differential Revision: https://reviews.llvm.org/D120683
54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ITERATOR_SIZE_H
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#define _LIBCPP___ITERATOR_SIZE_H
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#include <__config>
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#include <cstddef>
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#include <type_traits>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER > 14
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template <class _Cont>
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_LIBCPP_INLINE_VISIBILITY
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constexpr auto size(const _Cont& __c)
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_NOEXCEPT_(noexcept(__c.size()))
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-> decltype (__c.size())
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{ return __c.size(); }
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template <class _Tp, size_t _Sz>
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_LIBCPP_INLINE_VISIBILITY
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constexpr size_t size(const _Tp (&)[_Sz]) noexcept { return _Sz; }
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#if _LIBCPP_STD_VER > 17
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template <class _Cont>
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_LIBCPP_INLINE_VISIBILITY
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constexpr auto ssize(const _Cont& __c)
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_NOEXCEPT_(noexcept(static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size())))
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-> common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>
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{ return static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size()); }
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template <class _Tp, ptrdiff_t _Sz>
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_LIBCPP_INLINE_VISIBILITY
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constexpr ptrdiff_t ssize(const _Tp (&)[_Sz]) noexcept { return _Sz; }
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#endif
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#endif // _LIBCPP_STD_VER > 14
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ITERATOR_SIZE_H
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