xref: /llvm-project/libcxx/include/__cxx03/__concepts/relation.h (revision ce7771902dc50d900de639d499a60486b83f70e0)
1e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===//
2e78f53d1SNikolas Klauser //
3e78f53d1SNikolas Klauser // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4e78f53d1SNikolas Klauser // See https://llvm.org/LICENSE.txt for license information.
5e78f53d1SNikolas Klauser // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6e78f53d1SNikolas Klauser //
7e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===//
8e78f53d1SNikolas Klauser 
9*ce777190SNikolas Klauser #ifndef _LIBCPP___CXX03___CONCEPTS_RELATION_H
10*ce777190SNikolas Klauser #define _LIBCPP___CXX03___CONCEPTS_RELATION_H
11e78f53d1SNikolas Klauser 
1273fbae83SNikolas Klauser #include <__cxx03/__concepts/predicate.h>
1373fbae83SNikolas Klauser #include <__cxx03/__config>
14e78f53d1SNikolas Klauser 
15e78f53d1SNikolas Klauser #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
16e78f53d1SNikolas Klauser #  pragma GCC system_header
17e78f53d1SNikolas Klauser #endif
18e78f53d1SNikolas Klauser 
19e78f53d1SNikolas Klauser _LIBCPP_BEGIN_NAMESPACE_STD
20e78f53d1SNikolas Klauser 
21e78f53d1SNikolas Klauser #if _LIBCPP_STD_VER >= 20
22e78f53d1SNikolas Klauser 
23e78f53d1SNikolas Klauser // [concept.relation]
24e78f53d1SNikolas Klauser 
25e78f53d1SNikolas Klauser template <class _Rp, class _Tp, class _Up>
26e78f53d1SNikolas Klauser concept relation =
27e78f53d1SNikolas Klauser     predicate<_Rp, _Tp, _Tp> && predicate<_Rp, _Up, _Up> && predicate<_Rp, _Tp, _Up> && predicate<_Rp, _Up, _Tp>;
28e78f53d1SNikolas Klauser 
29e78f53d1SNikolas Klauser // [concept.equiv]
30e78f53d1SNikolas Klauser 
31e78f53d1SNikolas Klauser template <class _Rp, class _Tp, class _Up>
32e78f53d1SNikolas Klauser concept equivalence_relation = relation<_Rp, _Tp, _Up>;
33e78f53d1SNikolas Klauser 
34e78f53d1SNikolas Klauser // [concept.strictweakorder]
35e78f53d1SNikolas Klauser 
36e78f53d1SNikolas Klauser template <class _Rp, class _Tp, class _Up>
37e78f53d1SNikolas Klauser concept strict_weak_order = relation<_Rp, _Tp, _Up>;
38e78f53d1SNikolas Klauser 
39e78f53d1SNikolas Klauser #endif // _LIBCPP_STD_VER >= 20
40e78f53d1SNikolas Klauser 
41e78f53d1SNikolas Klauser _LIBCPP_END_NAMESPACE_STD
42e78f53d1SNikolas Klauser 
43*ce777190SNikolas Klauser #endif // _LIBCPP___CXX03___CONCEPTS_RELATION_H
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