1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP___ITERATOR_INDIRECTLY_COMPARABLE_H
11#define _LIBCPP___ITERATOR_INDIRECTLY_COMPARABLE_H
12
13#include <__config>
14#include <__functional/identity.h>
15#include <__iterator/concepts.h>
16#include <__iterator/projected.h>
17
18#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19#  pragma GCC system_header
20#endif
21
22_LIBCPP_BEGIN_NAMESPACE_STD
23
24#if _LIBCPP_STD_VER >= 20
25
26template <class _I1, class _I2, class _Rp, class _P1 = identity, class _P2 = identity>
27concept indirectly_comparable = indirect_binary_predicate<_Rp, projected<_I1, _P1>, projected<_I2, _P2>>;
28
29#endif // _LIBCPP_STD_VER >= 20
30
31_LIBCPP_END_NAMESPACE_STD
32
33#endif // _LIBCPP___ITERATOR_INDIRECTLY_COMPARABLE_H
34