1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef _LIBCPP___CONCEPTS_CONSTRUCTIBLE_H
10#define _LIBCPP___CONCEPTS_CONSTRUCTIBLE_H
11
12#include <__concepts/convertible_to.h>
13#include <__concepts/destructible.h>
14#include <__config>
15#include <__type_traits/is_constructible.h>
16
17#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18# pragma GCC system_header
19#endif
20
21_LIBCPP_BEGIN_NAMESPACE_STD
22
23#if _LIBCPP_STD_VER >= 20
24
25// [concept.constructible]
26template <class _Tp, class... _Args>
27concept constructible_from = destructible<_Tp> && is_constructible_v<_Tp, _Args...>;
28
29// [concept.default.init]
30
31template <class _Tp>
32concept __default_initializable = requires { ::new _Tp; };
33
34template <class _Tp>
35concept default_initializable = constructible_from<_Tp> && requires { _Tp{}; } && __default_initializable<_Tp>;
36
37// [concept.moveconstructible]
38template <class _Tp>
39concept move_constructible = constructible_from<_Tp, _Tp> && convertible_to<_Tp, _Tp>;
40
41// [concept.copyconstructible]
42// clang-format off
43template <class _Tp>
44concept copy_constructible =
45 move_constructible<_Tp> &&
46 constructible_from<_Tp, _Tp&> && convertible_to<_Tp&, _Tp> &&
47 constructible_from<_Tp, const _Tp&> && convertible_to<const _Tp&, _Tp> &&
48 constructible_from<_Tp, const _Tp> && convertible_to<const _Tp, _Tp>;
49// clang-format on
50
51#endif // _LIBCPP_STD_VER >= 20
52
53_LIBCPP_END_NAMESPACE_STD
54
55#endif // _LIBCPP___CONCEPTS_CONSTRUCTIBLE_H
56