1349cc55cSDimitry Andric //===----------------------------------------------------------------------===// 2349cc55cSDimitry Andric // 3349cc55cSDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4349cc55cSDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5349cc55cSDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6349cc55cSDimitry Andric // 7349cc55cSDimitry Andric //===----------------------------------------------------------------------===// 8349cc55cSDimitry Andric 9349cc55cSDimitry Andric #ifndef _LIBCPP___CONCEPTS_DERIVED_FROM_H 10349cc55cSDimitry Andric #define _LIBCPP___CONCEPTS_DERIVED_FROM_H 11349cc55cSDimitry Andric 12349cc55cSDimitry Andric #include <__config> 13349cc55cSDimitry Andric #include <type_traits> 14349cc55cSDimitry Andric 15349cc55cSDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 16349cc55cSDimitry Andric # pragma GCC system_header 17349cc55cSDimitry Andric #endif 18349cc55cSDimitry Andric 19349cc55cSDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 20349cc55cSDimitry Andric 21*81ad6265SDimitry Andric #if _LIBCPP_STD_VER > 17 22349cc55cSDimitry Andric 23349cc55cSDimitry Andric // [concept.derived] 24349cc55cSDimitry Andric 25349cc55cSDimitry Andric template<class _Dp, class _Bp> 26349cc55cSDimitry Andric concept derived_from = 27349cc55cSDimitry Andric is_base_of_v<_Bp, _Dp> && 28349cc55cSDimitry Andric is_convertible_v<const volatile _Dp*, const volatile _Bp*>; 29349cc55cSDimitry Andric 30*81ad6265SDimitry Andric #endif // _LIBCPP_STD_VER > 17 31349cc55cSDimitry Andric 32349cc55cSDimitry Andric _LIBCPP_END_NAMESPACE_STD 33349cc55cSDimitry Andric 34349cc55cSDimitry Andric #endif // _LIBCPP___CONCEPTS_DERIVED_FROM_H 35