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42 lines
1.3 KiB
C++
42 lines
1.3 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ITERATOR_MERGEABLE_H
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#define _LIBCPP___ITERATOR_MERGEABLE_H
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#include <__config>
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#include <__functional/identity.h>
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#include <__functional/ranges_operations.h>
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#include <__iterator/concepts.h>
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#include <__iterator/projected.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER >= 20
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template <class _Input1,
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class _Input2,
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class _Output,
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class _Comp = ranges::less,
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class _Proj1 = identity,
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class _Proj2 = identity>
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concept mergeable =
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input_iterator<_Input1> && input_iterator<_Input2> && weakly_incrementable<_Output> &&
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indirectly_copyable<_Input1, _Output> && indirectly_copyable<_Input2, _Output> &&
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indirect_strict_weak_order<_Comp, projected<_Input1, _Proj1>, projected<_Input2, _Proj2>>;
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ITERATOR_MERGEABLE_H
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