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> 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 !defined(_LIBCPP_HAS_NO_CONCEPTS) 24 25 // [concept.constructible] 26 template<class _Tp, class... _Args> 27 concept constructible_from = 28 destructible<_Tp> && is_constructible_v<_Tp, _Args...>; 29 30 // [concept.default.init] 31 32 template<class _Tp> 33 concept __default_initializable = requires { ::new _Tp; }; 34 35 template<class _Tp> 36 concept default_initializable = constructible_from<_Tp> && 37 requires { _Tp{}; } && __default_initializable<_Tp>; 38 39 // [concept.moveconstructible] 40 template<class _Tp> 41 concept move_constructible = 42 constructible_from<_Tp, _Tp> && convertible_to<_Tp, _Tp>; 43 44 // [concept.copyconstructible] 45 template<class _Tp> 46 concept copy_constructible = 47 move_constructible<_Tp> && 48 constructible_from<_Tp, _Tp&> && convertible_to<_Tp&, _Tp> && 49 constructible_from<_Tp, const _Tp&> && convertible_to<const _Tp&, _Tp> && 50 constructible_from<_Tp, const _Tp> && convertible_to<const _Tp, _Tp>; 51 52 #endif // !defined(_LIBCPP_HAS_NO_CONCEPTS) 53 54 _LIBCPP_END_NAMESPACE_STD 55 56 #endif // _LIBCPP___CONCEPTS_CONSTRUCTIBLE_H 57