xref: /llvm-project/libcxx/include/__cxx03/__iterator/mergeable.h (revision ce7771902dc50d900de639d499a60486b83f70e0)
1e78f53d1SNikolas Klauser // -*- C++ -*-
2e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===//
3e78f53d1SNikolas Klauser //
4e78f53d1SNikolas Klauser // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5e78f53d1SNikolas Klauser // See https://llvm.org/LICENSE.txt for license information.
6e78f53d1SNikolas Klauser // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7e78f53d1SNikolas Klauser //
8e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===//
9e78f53d1SNikolas Klauser 
10*ce777190SNikolas Klauser #ifndef _LIBCPP___CXX03___ITERATOR_MERGEABLE_H
11*ce777190SNikolas Klauser #define _LIBCPP___CXX03___ITERATOR_MERGEABLE_H
12e78f53d1SNikolas Klauser 
1373fbae83SNikolas Klauser #include <__cxx03/__config>
1473fbae83SNikolas Klauser #include <__cxx03/__functional/identity.h>
1573fbae83SNikolas Klauser #include <__cxx03/__functional/ranges_operations.h>
1673fbae83SNikolas Klauser #include <__cxx03/__iterator/concepts.h>
1773fbae83SNikolas Klauser #include <__cxx03/__iterator/projected.h>
18e78f53d1SNikolas Klauser 
19e78f53d1SNikolas Klauser #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
20e78f53d1SNikolas Klauser #  pragma GCC system_header
21e78f53d1SNikolas Klauser #endif
22e78f53d1SNikolas Klauser 
23e78f53d1SNikolas Klauser _LIBCPP_BEGIN_NAMESPACE_STD
24e78f53d1SNikolas Klauser 
25e78f53d1SNikolas Klauser #if _LIBCPP_STD_VER >= 20
26e78f53d1SNikolas Klauser 
27e78f53d1SNikolas Klauser template <class _Input1,
28e78f53d1SNikolas Klauser           class _Input2,
29e78f53d1SNikolas Klauser           class _Output,
30e78f53d1SNikolas Klauser           class _Comp  = ranges::less,
31e78f53d1SNikolas Klauser           class _Proj1 = identity,
32e78f53d1SNikolas Klauser           class _Proj2 = identity>
33e78f53d1SNikolas Klauser concept mergeable =
34e78f53d1SNikolas Klauser     input_iterator<_Input1> && input_iterator<_Input2> && weakly_incrementable<_Output> &&
35e78f53d1SNikolas Klauser     indirectly_copyable<_Input1, _Output> && indirectly_copyable<_Input2, _Output> &&
36e78f53d1SNikolas Klauser     indirect_strict_weak_order<_Comp, projected<_Input1, _Proj1>, projected<_Input2, _Proj2>>;
37e78f53d1SNikolas Klauser 
38e78f53d1SNikolas Klauser #endif // _LIBCPP_STD_VER >= 20
39e78f53d1SNikolas Klauser 
40e78f53d1SNikolas Klauser _LIBCPP_END_NAMESPACE_STD
41e78f53d1SNikolas Klauser 
42*ce777190SNikolas Klauser #endif // _LIBCPP___CXX03___ITERATOR_MERGEABLE_H
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