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55 lines
1.7 KiB
C++
55 lines
1.7 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_CONSTRUCTIBLE_H
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#define _LIBCPP___CONCEPTS_CONSTRUCTIBLE_H
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#include <__concepts/convertible_to.h>
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#include <__concepts/destructible.h>
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#include <__config>
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#include <__type_traits/is_constructible.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.constructible]
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template <class _Tp, class... _Args>
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concept constructible_from = destructible<_Tp> && is_constructible_v<_Tp, _Args...>;
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// [concept.default.init]
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template <class _Tp>
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concept __default_initializable = requires { ::new _Tp; };
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template <class _Tp>
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concept default_initializable = constructible_from<_Tp> && requires { _Tp{}; } && __default_initializable<_Tp>;
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// [concept.moveconstructible]
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template <class _Tp>
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concept move_constructible = constructible_from<_Tp, _Tp> && convertible_to<_Tp, _Tp>;
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// [concept.copyconstructible]
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// clang-format off
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template <class _Tp>
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concept copy_constructible =
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move_constructible<_Tp> &&
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constructible_from<_Tp, _Tp&> && convertible_to<_Tp&, _Tp> &&
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constructible_from<_Tp, const _Tp&> && convertible_to<const _Tp&, _Tp> &&
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constructible_from<_Tp, const _Tp> && convertible_to<const _Tp, _Tp>;
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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_CONSTRUCTIBLE_H
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