1*4bdff4beSrobert //===----------------------------------------------------------------------===// 2*4bdff4beSrobert // 3*4bdff4beSrobert // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*4bdff4beSrobert // See https://llvm.org/LICENSE.txt for license information. 5*4bdff4beSrobert // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*4bdff4beSrobert // 7*4bdff4beSrobert //===----------------------------------------------------------------------===// 8*4bdff4beSrobert 9*4bdff4beSrobert #ifndef _LIBCPP___CONCEPTS_DERIVED_FROM_H 10*4bdff4beSrobert #define _LIBCPP___CONCEPTS_DERIVED_FROM_H 11*4bdff4beSrobert 12*4bdff4beSrobert #include <__config> 13*4bdff4beSrobert #include <__type_traits/is_base_of.h> 14*4bdff4beSrobert #include <__type_traits/is_convertible.h> 15*4bdff4beSrobert 16*4bdff4beSrobert #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17*4bdff4beSrobert # pragma GCC system_header 18*4bdff4beSrobert #endif 19*4bdff4beSrobert 20*4bdff4beSrobert _LIBCPP_BEGIN_NAMESPACE_STD 21*4bdff4beSrobert 22*4bdff4beSrobert #if _LIBCPP_STD_VER > 17 23*4bdff4beSrobert 24*4bdff4beSrobert // [concept.derived] 25*4bdff4beSrobert 26*4bdff4beSrobert template<class _Dp, class _Bp> 27*4bdff4beSrobert concept derived_from = 28*4bdff4beSrobert is_base_of_v<_Bp, _Dp> && 29*4bdff4beSrobert is_convertible_v<const volatile _Dp*, const volatile _Bp*>; 30*4bdff4beSrobert 31*4bdff4beSrobert #endif // _LIBCPP_STD_VER > 17 32*4bdff4beSrobert 33*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD 34*4bdff4beSrobert 35*4bdff4beSrobert #endif // _LIBCPP___CONCEPTS_DERIVED_FROM_H 36