158915667SArthur O'Dwyer //===----------------------------------------------------------------------===// 258915667SArthur O'Dwyer // 358915667SArthur O'Dwyer // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 458915667SArthur O'Dwyer // See https://llvm.org/LICENSE.txt for license information. 558915667SArthur O'Dwyer // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 658915667SArthur O'Dwyer // 758915667SArthur O'Dwyer //===----------------------------------------------------------------------===// 858915667SArthur O'Dwyer 958915667SArthur O'Dwyer #ifndef _LIBCPP___CONCEPTS_COMMON_REFERENCE_WITH_H 1058915667SArthur O'Dwyer #define _LIBCPP___CONCEPTS_COMMON_REFERENCE_WITH_H 1158915667SArthur O'Dwyer 1258915667SArthur O'Dwyer #include <__concepts/convertible_to.h> 1358915667SArthur O'Dwyer #include <__concepts/same_as.h> 1458915667SArthur O'Dwyer #include <__config> 1566ba7c32SNikolas Klauser #include <__type_traits/common_reference.h> 1658915667SArthur O'Dwyer 1758915667SArthur O'Dwyer #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 1858915667SArthur O'Dwyer # pragma GCC system_header 1958915667SArthur O'Dwyer #endif 2058915667SArthur O'Dwyer 2158915667SArthur O'Dwyer _LIBCPP_BEGIN_NAMESPACE_STD 2258915667SArthur O'Dwyer 234f15267dSNikolas Klauser #if _LIBCPP_STD_VER >= 20 2458915667SArthur O'Dwyer 2558915667SArthur O'Dwyer // [concept.commonref] 2658915667SArthur O'Dwyer 2758915667SArthur O'Dwyer template <class _Tp, class _Up> 2858915667SArthur O'Dwyer concept common_reference_with = 2958915667SArthur O'Dwyer same_as<common_reference_t<_Tp, _Up>, common_reference_t<_Up, _Tp>> && 30*5aa03b64SLouis Dionne convertible_to<_Tp, common_reference_t<_Tp, _Up>> && convertible_to<_Up, common_reference_t<_Tp, _Up>>; 3158915667SArthur O'Dwyer 324f15267dSNikolas Klauser #endif // _LIBCPP_STD_VER >= 20 3358915667SArthur O'Dwyer 3458915667SArthur O'Dwyer _LIBCPP_END_NAMESPACE_STD 3558915667SArthur O'Dwyer 3658915667SArthur O'Dwyer #endif // _LIBCPP___CONCEPTS_COMMON_REFERENCE_WITH_H 37