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> 13*bdd1243dSDimitry Andric #include <__type_traits/is_base_of.h> 14*bdd1243dSDimitry Andric #include <__type_traits/is_convertible.h> 15349cc55cSDimitry Andric 16349cc55cSDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17349cc55cSDimitry Andric # pragma GCC system_header 18349cc55cSDimitry Andric #endif 19349cc55cSDimitry Andric 20349cc55cSDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 21349cc55cSDimitry Andric 2281ad6265SDimitry Andric #if _LIBCPP_STD_VER > 17 23349cc55cSDimitry Andric 24349cc55cSDimitry Andric // [concept.derived] 25349cc55cSDimitry Andric 26349cc55cSDimitry Andric template<class _Dp, class _Bp> 27349cc55cSDimitry Andric concept derived_from = 28349cc55cSDimitry Andric is_base_of_v<_Bp, _Dp> && 29349cc55cSDimitry Andric is_convertible_v<const volatile _Dp*, const volatile _Bp*>; 30349cc55cSDimitry Andric 3181ad6265SDimitry Andric #endif // _LIBCPP_STD_VER > 17 32349cc55cSDimitry Andric 33349cc55cSDimitry Andric _LIBCPP_END_NAMESPACE_STD 34349cc55cSDimitry Andric 35349cc55cSDimitry Andric #endif // _LIBCPP___CONCEPTS_DERIVED_FROM_H 36