| //===----------------------------------------------------------------------===// |
| // |
| // 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_WITH_H |
| #define _LIBCPP___CONCEPTS_COMMON_WITH_H |
| |
| #include <__concepts/common_reference_with.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.common] |
| |
| template<class _Tp, class _Up> |
| concept common_with = |
| same_as<common_type_t<_Tp, _Up>, common_type_t<_Up, _Tp>> && |
| requires { |
| static_cast<common_type_t<_Tp, _Up>>(declval<_Tp>()); |
| static_cast<common_type_t<_Tp, _Up>>(declval<_Up>()); |
| } && |
| common_reference_with< |
| add_lvalue_reference_t<const _Tp>, |
| add_lvalue_reference_t<const _Up>> && |
| common_reference_with< |
| add_lvalue_reference_t<common_type_t<_Tp, _Up>>, |
| common_reference_t< |
| add_lvalue_reference_t<const _Tp>, |
| add_lvalue_reference_t<const _Up>>>; |
| |
| #endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS) |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___CONCEPTS_COMMON_WITH_H |
