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36 lines
1.1 KiB
C++
36 lines
1.1 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_REFERENCE_WITH_H
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#define _LIBCPP___CONCEPTS_COMMON_REFERENCE_WITH_H
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#include <__concepts/convertible_to.h>
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#include <__concepts/same_as.h>
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#include <__config>
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#include <__type_traits/common_reference.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.commonref]
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template <class _Tp, class _Up>
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concept common_reference_with =
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same_as<common_reference_t<_Tp, _Up>, common_reference_t<_Up, _Tp>> &&
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convertible_to<_Tp, common_reference_t<_Tp, _Up>> && convertible_to<_Up, common_reference_t<_Tp, _Up>>;
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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_REFERENCE_WITH_H
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