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d2baefae68
All supported compilers that support C++20 now support concepts. So, remove `_LIB_LIBCPP_HAS_NO_CONCEPTS` in favor of `_LIBCPP_STD_VER > 17`. Similarly in the tests, remove `// UNSUPPORTED: libcpp-no-concepts`. Differential Revision: https://reviews.llvm.org/D121528
41 lines
1.1 KiB
C++
41 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_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 <__utility/forward.h>
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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 > 17
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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 = _VSTD::forward<_Rhs>(__rhs) } -> same_as<_Lhs>;
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};
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#endif // _LIBCPP_STD_VER > 17
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___CONCEPTS_ASSIGNABLE_H
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