| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___CONCEPTS_COMMON_REFERENCE_WITH_H |
| #define _LIBCPP___CONCEPTS_COMMON_REFERENCE_WITH_H |
| |
| #include <__concepts/convertible_to.h> |
| #include <__concepts/same_as.h> |
| #include <__config> |
| #include <type_traits> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| #pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS) |
| |
| // [concept.commonref] |
| |
| template<class _Tp, class _Up> |
| concept common_reference_with = |
| same_as<common_reference_t<_Tp, _Up>, common_reference_t<_Up, _Tp>> && |
| convertible_to<_Tp, common_reference_t<_Tp, _Up>> && |
| convertible_to<_Up, common_reference_t<_Tp, _Up>>; |
| |
| #endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS) |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___CONCEPTS_COMMON_REFERENCE_WITH_H |
