1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef _LIBCPP___ALGORITHM_RANGES_SET_UNION_H
10#define _LIBCPP___ALGORITHM_RANGES_SET_UNION_H
11
12#include <__algorithm/in_in_out_result.h>
13#include <__algorithm/iterator_operations.h>
14#include <__algorithm/make_projected.h>
15#include <__algorithm/set_union.h>
16#include <__config>
17#include <__functional/identity.h>
18#include <__functional/invoke.h>
19#include <__functional/ranges_operations.h>
20#include <__iterator/concepts.h>
21#include <__iterator/iterator_traits.h>
22#include <__iterator/mergeable.h>
23#include <__iterator/projected.h>
24#include <__ranges/access.h>
25#include <__ranges/concepts.h>
26#include <__ranges/dangling.h>
27#include <__utility/forward.h>
28#include <__utility/move.h>
29
30#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
31#  pragma GCC system_header
32#endif
33
34_LIBCPP_PUSH_MACROS
35#include <__undef_macros>
36
37#if _LIBCPP_STD_VER >= 20
38
39_LIBCPP_BEGIN_NAMESPACE_STD
40
41namespace ranges {
42
43template <class _InIter1, class _InIter2, class _OutIter>
44using set_union_result = in_in_out_result<_InIter1, _InIter2, _OutIter>;
45
46namespace __set_union {
47
48struct __fn {
49  template <input_iterator _InIter1,
50            sentinel_for<_InIter1> _Sent1,
51            input_iterator _InIter2,
52            sentinel_for<_InIter2> _Sent2,
53            weakly_incrementable _OutIter,
54            class _Comp  = ranges::less,
55            class _Proj1 = identity,
56            class _Proj2 = identity>
57    requires mergeable<_InIter1, _InIter2, _OutIter, _Comp, _Proj1, _Proj2>
58  _LIBCPP_HIDE_FROM_ABI constexpr set_union_result<_InIter1, _InIter2, _OutIter> operator()(
59      _InIter1 __first1,
60      _Sent1 __last1,
61      _InIter2 __first2,
62      _Sent2 __last2,
63      _OutIter __result,
64      _Comp __comp   = {},
65      _Proj1 __proj1 = {},
66      _Proj2 __proj2 = {}) const {
67    auto __ret = std::__set_union<_RangeAlgPolicy>(
68        std::move(__first1),
69        std::move(__last1),
70        std::move(__first2),
71        std::move(__last2),
72        std::move(__result),
73        ranges::__make_projected_comp(__comp, __proj1, __proj2));
74    return {std::move(__ret.__in1_), std::move(__ret.__in2_), std::move(__ret.__out_)};
75  }
76
77  template <input_range _Range1,
78            input_range _Range2,
79            weakly_incrementable _OutIter,
80            class _Comp  = ranges::less,
81            class _Proj1 = identity,
82            class _Proj2 = identity>
83    requires mergeable<iterator_t<_Range1>, iterator_t<_Range2>, _OutIter, _Comp, _Proj1, _Proj2>
84  _LIBCPP_HIDE_FROM_ABI constexpr set_union_result<borrowed_iterator_t<_Range1>, borrowed_iterator_t<_Range2>, _OutIter>
85  operator()(_Range1&& __range1,
86             _Range2&& __range2,
87             _OutIter __result,
88             _Comp __comp   = {},
89             _Proj1 __proj1 = {},
90             _Proj2 __proj2 = {}) const {
91    auto __ret = std::__set_union<_RangeAlgPolicy>(
92        ranges::begin(__range1),
93        ranges::end(__range1),
94        ranges::begin(__range2),
95        ranges::end(__range2),
96        std::move(__result),
97        ranges::__make_projected_comp(__comp, __proj1, __proj2));
98    return {std::move(__ret.__in1_), std::move(__ret.__in2_), std::move(__ret.__out_)};
99  }
100};
101
102} // namespace __set_union
103
104inline namespace __cpo {
105inline constexpr auto set_union = __set_union::__fn{};
106} // namespace __cpo
107} // namespace ranges
108
109_LIBCPP_END_NAMESPACE_STD
110
111#endif // _LIBCPP_STD_VER >= 20
112
113_LIBCPP_POP_MACROS
114
115#endif // _LIBCPP___ALGORITHM_RANGES_SET_UNION_H
116