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52 lines
1.6 KiB
C++
52 lines
1.6 KiB
C++
//===----------------------------------------------------------------------===//
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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___CONCEPTS_COMMON_WITH_H
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#define _LIBCPP___CONCEPTS_COMMON_WITH_H
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#include <__concepts/common_reference_with.h>
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#include <__concepts/same_as.h>
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#include <__config>
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#include <__type_traits/add_lvalue_reference.h>
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#include <__type_traits/common_reference.h>
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#include <__type_traits/common_type.h>
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#include <__utility/declval.h>
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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 >= 20
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// [concept.common]
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// clang-format off
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template <class _Tp, class _Up>
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concept common_with =
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same_as<common_type_t<_Tp, _Up>, common_type_t<_Up, _Tp>> &&
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requires {
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static_cast<common_type_t<_Tp, _Up>>(std::declval<_Tp>());
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static_cast<common_type_t<_Tp, _Up>>(std::declval<_Up>());
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} &&
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common_reference_with<
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add_lvalue_reference_t<const _Tp>,
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add_lvalue_reference_t<const _Up>> &&
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common_reference_with<
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add_lvalue_reference_t<common_type_t<_Tp, _Up>>,
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common_reference_t<
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add_lvalue_reference_t<const _Tp>,
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add_lvalue_reference_t<const _Up>>>;
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// clang-format on
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___CONCEPTS_COMMON_WITH_H
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