| //===----------------------------------------------------------------------===// |
| // |
| // 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> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| #pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS) |
| |
| // [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 && !defined(_LIBCPP_HAS_NO_CONCEPTS) |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___CONCEPTS_CONSTRUCTIBLE_H |
