45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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 > 17
|
|
|
|
// [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 > 17
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
#endif // _LIBCPP___CONCEPTS_RELATION_H
|