v1/__iterator/indirectly_comparable.h

0001 // -*- C++ -*-
0002 //===----------------------------------------------------------------------===//
0003 //
0004 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0005 // See https://llvm.org/LICENSE.txt for license information.
0006 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0007 //
0008 //===----------------------------------------------------------------------===//
0009
0010 #ifndef _LIBCPP___ITERATOR_INDIRECTLY_COMPARABLE_H
0011 #define _LIBCPP___ITERATOR_INDIRECTLY_COMPARABLE_H
0012
0013 #include <__config>
0014 #include <__functional/identity.h>
0015 #include <__iterator/concepts.h>
0016 #include <__iterator/projected.h>
0017
0018 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0019 #  pragma GCC system_header
0020 #endif
0021
0022 _LIBCPP_BEGIN_NAMESPACE_STD
0023
0024 #if _LIBCPP_STD_VER >= 20
0025
0026 template <class _I1, class _I2, class _Rp, class _P1 = identity, class _P2 = identity>
0027 concept indirectly_comparable = indirect_binary_predicate<_Rp, projected<_I1, _P1>, projected<_I2, _P2>>;
0028
0029 #endif // _LIBCPP_STD_VER >= 20
0030
0031 _LIBCPP_END_NAMESPACE_STD
0032
0033 #endif // _LIBCPP___ITERATOR_INDIRECTLY_COMPARABLE_H