6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
57 lines
1.8 KiB
C++
57 lines
1.8 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_EQUALITY_COMPARABLE_H
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#define _LIBCPP___CONCEPTS_EQUALITY_COMPARABLE_H
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#include <__concepts/boolean_testable.h>
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#include <__concepts/common_reference_with.h>
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#include <__config>
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#include <__type_traits/common_reference.h>
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#include <__type_traits/make_const_lvalue_ref.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.equalitycomparable]
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template <class _Tp, class _Up>
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concept __weakly_equality_comparable_with =
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requires(__make_const_lvalue_ref<_Tp> __t, __make_const_lvalue_ref<_Up> __u) {
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{ __t == __u } -> __boolean_testable;
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{ __t != __u } -> __boolean_testable;
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{ __u == __t } -> __boolean_testable;
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{ __u != __t } -> __boolean_testable;
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};
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template <class _Tp>
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concept equality_comparable = __weakly_equality_comparable_with<_Tp, _Tp>;
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// clang-format off
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template <class _Tp, class _Up>
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concept equality_comparable_with =
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equality_comparable<_Tp> && equality_comparable<_Up> &&
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common_reference_with<__make_const_lvalue_ref<_Tp>, __make_const_lvalue_ref<_Up>> &&
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equality_comparable<
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common_reference_t<
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__make_const_lvalue_ref<_Tp>,
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__make_const_lvalue_ref<_Up>>> &&
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__weakly_equality_comparable_with<_Tp, _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_EQUALITY_COMPARABLE_H
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