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] 26 template <class _Tp, class... _Args> 27 concept constructible_from = destructible<_Tp> && is_constructible_v<_Tp, _Args...>; 28 29 // [concept.default.init] 30 31 template <class _Tp> 32 concept __default_initializable = requires { ::new _Tp; }; 33 34 template <class _Tp> 35 concept default_initializable = constructible_from<_Tp> && requires { _Tp{}; } && __default_initializable<_Tp>; 36 37 // [concept.moveconstructible] 38 template <class _Tp> 39 concept move_constructible = constructible_from<_Tp, _Tp> && convertible_to<_Tp, _Tp>; 40 41 // [concept.copyconstructible] 42 // clang-format off 43 template <class _Tp> 44 concept 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