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 > 17
25 
26 template <class _I1, class _I2, class _Rp, class _P1 = identity, class _P2 = identity>
27 concept indirectly_comparable =
28   indirect_binary_predicate<_Rp, projected<_I1, _P1>, projected<_I2, _P2>>;
29 
30 #endif // _LIBCPP_STD_VER > 17
31 
32 _LIBCPP_END_NAMESPACE_STD
33 
34 #endif // _LIBCPP___ITERATOR_INDIRECTLY_COMPARABLE_H
35