| //===----------------------------------------------------------------------===// |
| // |
| // 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_RELATION_H |
| #define _LIBCPP___CONCEPTS_RELATION_H |
| |
| #include <__concepts/predicate.h> |
| #include <__config> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if _LIBCPP_STD_VER >= 20 |
| |
| // [concept.relation] |
| |
| template <class _Rp, class _Tp, class _Up> |
| concept relation = |
| predicate<_Rp, _Tp, _Tp> && predicate<_Rp, _Up, _Up> && predicate<_Rp, _Tp, _Up> && predicate<_Rp, _Up, _Tp>; |
| |
| // [concept.equiv] |
| |
| template <class _Rp, class _Tp, class _Up> |
| concept equivalence_relation = relation<_Rp, _Tp, _Up>; |
| |
| // [concept.strictweakorder] |
| |
| template <class _Rp, class _Tp, class _Up> |
| concept strict_weak_order = relation<_Rp, _Tp, _Up>; |
| |
| #endif // _LIBCPP_STD_VER >= 20 |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___CONCEPTS_RELATION_H |
