6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
42 lines
1.2 KiB
C++
42 lines
1.2 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_ASSIGNABLE_H
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#define _LIBCPP___CONCEPTS_ASSIGNABLE_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/is_reference.h>
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#include <__type_traits/make_const_lvalue_ref.h>
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#include <__utility/forward.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.assignable]
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template <class _Lhs, class _Rhs>
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concept assignable_from =
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is_lvalue_reference_v<_Lhs> &&
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common_reference_with<__make_const_lvalue_ref<_Lhs>, __make_const_lvalue_ref<_Rhs>> &&
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requires(_Lhs __lhs, _Rhs&& __rhs) {
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{ __lhs = std::forward<_Rhs>(__rhs) } -> same_as<_Lhs>;
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};
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___CONCEPTS_ASSIGNABLE_H
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