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_WITH_H 10*ce777190SNikolas Klauser #define _LIBCPP___CXX03___CONCEPTS_COMMON_WITH_H 11e78f53d1SNikolas Klauser 1273fbae83SNikolas Klauser #include <__cxx03/__concepts/common_reference_with.h> 1373fbae83SNikolas Klauser #include <__cxx03/__concepts/same_as.h> 1473fbae83SNikolas Klauser #include <__cxx03/__config> 1573fbae83SNikolas Klauser #include <__cxx03/__type_traits/add_lvalue_reference.h> 1673fbae83SNikolas Klauser #include <__cxx03/__type_traits/common_reference.h> 1773fbae83SNikolas Klauser #include <__cxx03/__type_traits/common_type.h> 1873fbae83SNikolas Klauser #include <__cxx03/__utility/declval.h> 19e78f53d1SNikolas Klauser 20e78f53d1SNikolas Klauser #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 21e78f53d1SNikolas Klauser # pragma GCC system_header 22e78f53d1SNikolas Klauser #endif 23e78f53d1SNikolas Klauser 24e78f53d1SNikolas Klauser _LIBCPP_BEGIN_NAMESPACE_STD 25e78f53d1SNikolas Klauser 26e78f53d1SNikolas Klauser #if _LIBCPP_STD_VER >= 20 27e78f53d1SNikolas Klauser 28e78f53d1SNikolas Klauser // [concept.common] 29e78f53d1SNikolas Klauser 30e78f53d1SNikolas Klauser // clang-format off 31e78f53d1SNikolas Klauser template <class _Tp, class _Up> 32e78f53d1SNikolas Klauser concept common_with = 33e78f53d1SNikolas Klauser same_as<common_type_t<_Tp, _Up>, common_type_t<_Up, _Tp>> && 34e78f53d1SNikolas Klauser requires { 35e78f53d1SNikolas Klauser static_cast<common_type_t<_Tp, _Up>>(std::declval<_Tp>()); 36e78f53d1SNikolas Klauser static_cast<common_type_t<_Tp, _Up>>(std::declval<_Up>()); 37e78f53d1SNikolas Klauser } && 38e78f53d1SNikolas Klauser common_reference_with< 39e78f53d1SNikolas Klauser add_lvalue_reference_t<const _Tp>, 40e78f53d1SNikolas Klauser add_lvalue_reference_t<const _Up>> && 41e78f53d1SNikolas Klauser common_reference_with< 42e78f53d1SNikolas Klauser add_lvalue_reference_t<common_type_t<_Tp, _Up>>, 43e78f53d1SNikolas Klauser common_reference_t< 44e78f53d1SNikolas Klauser add_lvalue_reference_t<const _Tp>, 45e78f53d1SNikolas Klauser add_lvalue_reference_t<const _Up>>>; 46e78f53d1SNikolas Klauser // clang-format on 47e78f53d1SNikolas Klauser 48e78f53d1SNikolas Klauser #endif // _LIBCPP_STD_VER >= 20 49e78f53d1SNikolas Klauser 50e78f53d1SNikolas Klauser _LIBCPP_END_NAMESPACE_STD 51e78f53d1SNikolas Klauser 52*ce777190SNikolas Klauser #endif // _LIBCPP___CXX03___CONCEPTS_COMMON_WITH_H 53