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_COMMON_REFERENCE_WITH_H 10*4bdff4beSrobert #define _LIBCPP___CONCEPTS_COMMON_REFERENCE_WITH_H 11*4bdff4beSrobert 12*4bdff4beSrobert #include <__concepts/convertible_to.h> 13*4bdff4beSrobert #include <__concepts/same_as.h> 14*4bdff4beSrobert #include <__config> 15*4bdff4beSrobert #include <__type_traits/common_reference.h> 16*4bdff4beSrobert 17*4bdff4beSrobert #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18*4bdff4beSrobert # pragma GCC system_header 19*4bdff4beSrobert #endif 20*4bdff4beSrobert 21*4bdff4beSrobert _LIBCPP_BEGIN_NAMESPACE_STD 22*4bdff4beSrobert 23*4bdff4beSrobert #if _LIBCPP_STD_VER > 17 24*4bdff4beSrobert 25*4bdff4beSrobert // [concept.commonref] 26*4bdff4beSrobert 27*4bdff4beSrobert template<class _Tp, class _Up> 28*4bdff4beSrobert concept common_reference_with = 29*4bdff4beSrobert same_as<common_reference_t<_Tp, _Up>, common_reference_t<_Up, _Tp>> && 30*4bdff4beSrobert convertible_to<_Tp, common_reference_t<_Tp, _Up>> && 31*4bdff4beSrobert convertible_to<_Up, common_reference_t<_Tp, _Up>>; 32*4bdff4beSrobert 33*4bdff4beSrobert #endif // _LIBCPP_STD_VER > 17 34*4bdff4beSrobert 35*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD 36*4bdff4beSrobert 37*4bdff4beSrobert #endif // _LIBCPP___CONCEPTS_COMMON_REFERENCE_WITH_H 38