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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___CONCEPTS_CONSTRUCTIBLE_H
#define _LIBCPP___CONCEPTS_CONSTRUCTIBLE_H
#include <__concepts/convertible_to.h>
#include <__concepts/destructible.h>
#include <__config>
#include <__type_traits/is_constructible.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
#if _LIBCPP_STD_VER > 17
// [concept.constructible]
template<class _Tp, class... _Args>
concept constructible_from =
destructible<_Tp> && is_constructible_v<_Tp, _Args...>;
// [concept.default.init]
template<class _Tp>
concept __default_initializable = requires { ::new _Tp; };
template<class _Tp>
concept default_initializable = constructible_from<_Tp> &&
requires { _Tp{}; } && __default_initializable<_Tp>;
// [concept.moveconstructible]
template<class _Tp>
concept move_constructible =
constructible_from<_Tp, _Tp> && convertible_to<_Tp, _Tp>;
// [concept.copyconstructible]
template<class _Tp>
concept copy_constructible =
move_constructible<_Tp> &&
constructible_from<_Tp, _Tp&> && convertible_to<_Tp&, _Tp> &&
constructible_from<_Tp, const _Tp&> && convertible_to<const _Tp&, _Tp> &&
constructible_from<_Tp, const _Tp> && convertible_to<const _Tp, _Tp>;
#endif // _LIBCPP_STD_VER > 17
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___CONCEPTS_CONSTRUCTIBLE_H
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