1e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 2e78f53d1SNikolas Klauser // 3e78f53d1SNikolas Klauser // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4e78f53d1SNikolas Klauser // See https://llvm.org/LICENSE.txt for license information. 5e78f53d1SNikolas Klauser // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6e78f53d1SNikolas Klauser // 7e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 8e78f53d1SNikolas Klauser 9*ce777190SNikolas Klauser #ifndef _LIBCPP___CXX03___CONCEPTS_COMMON_REFERENCE_WITH_H 10*ce777190SNikolas Klauser #define _LIBCPP___CXX03___CONCEPTS_COMMON_REFERENCE_WITH_H 11e78f53d1SNikolas Klauser 1273fbae83SNikolas Klauser #include <__cxx03/__concepts/convertible_to.h> 1373fbae83SNikolas Klauser #include <__cxx03/__concepts/same_as.h> 1473fbae83SNikolas Klauser #include <__cxx03/__config> 1573fbae83SNikolas Klauser #include <__cxx03/__type_traits/common_reference.h> 16e78f53d1SNikolas Klauser 17e78f53d1SNikolas Klauser #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18e78f53d1SNikolas Klauser # pragma GCC system_header 19e78f53d1SNikolas Klauser #endif 20e78f53d1SNikolas Klauser 21e78f53d1SNikolas Klauser _LIBCPP_BEGIN_NAMESPACE_STD 22e78f53d1SNikolas Klauser 23e78f53d1SNikolas Klauser #if _LIBCPP_STD_VER >= 20 24e78f53d1SNikolas Klauser 25e78f53d1SNikolas Klauser // [concept.commonref] 26e78f53d1SNikolas Klauser 27e78f53d1SNikolas Klauser template <class _Tp, class _Up> 28e78f53d1SNikolas Klauser concept common_reference_with = 29e78f53d1SNikolas Klauser same_as<common_reference_t<_Tp, _Up>, common_reference_t<_Up, _Tp>> && 30e78f53d1SNikolas Klauser convertible_to<_Tp, common_reference_t<_Tp, _Up>> && convertible_to<_Up, common_reference_t<_Tp, _Up>>; 31e78f53d1SNikolas Klauser 32e78f53d1SNikolas Klauser #endif // _LIBCPP_STD_VER >= 20 33e78f53d1SNikolas Klauser 34e78f53d1SNikolas Klauser _LIBCPP_END_NAMESPACE_STD 35e78f53d1SNikolas Klauser 36*ce777190SNikolas Klauser #endif // _LIBCPP___CXX03___CONCEPTS_COMMON_REFERENCE_WITH_H 37