1*4bdff4beSrobert // -*- C++ -*-
2*4bdff4beSrobert //===----------------------------------------------------------------------===//
3*4bdff4beSrobert //
4*4bdff4beSrobert // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5*4bdff4beSrobert // See https://llvm.org/LICENSE.txt for license information.
6*4bdff4beSrobert // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7*4bdff4beSrobert //
8*4bdff4beSrobert //===----------------------------------------------------------------------===//
9*4bdff4beSrobert 
10*4bdff4beSrobert #ifndef _LIBCPP___ITERATOR_MERGEABLE_H
11*4bdff4beSrobert #define _LIBCPP___ITERATOR_MERGEABLE_H
12*4bdff4beSrobert 
13*4bdff4beSrobert #include <__config>
14*4bdff4beSrobert #include <__functional/identity.h>
15*4bdff4beSrobert #include <__functional/ranges_operations.h>
16*4bdff4beSrobert #include <__iterator/concepts.h>
17*4bdff4beSrobert #include <__iterator/projected.h>
18*4bdff4beSrobert 
19*4bdff4beSrobert #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
20*4bdff4beSrobert #  pragma GCC system_header
21*4bdff4beSrobert #endif
22*4bdff4beSrobert 
23*4bdff4beSrobert _LIBCPP_BEGIN_NAMESPACE_STD
24*4bdff4beSrobert 
25*4bdff4beSrobert #if _LIBCPP_STD_VER > 17
26*4bdff4beSrobert 
27*4bdff4beSrobert template <class _Input1, class _Input2, class _Output,
28*4bdff4beSrobert           class _Comp = ranges::less, class _Proj1 = identity, class _Proj2 = identity>
29*4bdff4beSrobert concept mergeable =
30*4bdff4beSrobert     input_iterator<_Input1> &&
31*4bdff4beSrobert     input_iterator<_Input2> &&
32*4bdff4beSrobert     weakly_incrementable<_Output> &&
33*4bdff4beSrobert     indirectly_copyable<_Input1, _Output> &&
34*4bdff4beSrobert     indirectly_copyable<_Input2, _Output> &&
35*4bdff4beSrobert     indirect_strict_weak_order<_Comp, projected<_Input1, _Proj1>, projected<_Input2, _Proj2>>;
36*4bdff4beSrobert 
37*4bdff4beSrobert #endif // _LIBCPP_STD_VER > 17
38*4bdff4beSrobert 
39*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD
40*4bdff4beSrobert 
41*4bdff4beSrobert #endif // _LIBCPP___ITERATOR_MERGEABLE_H
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