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_INTERSECTION_H
10#define _LIBCPP___ALGORITHM_RANGES_SET_INTERSECTION_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_intersection.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/mergeable.h>
22#include <__ranges/access.h>
23#include <__ranges/concepts.h>
24#include <__ranges/dangling.h>
25#include <__utility/move.h>
26
27#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
28#  pragma GCC system_header
29#endif
30
31_LIBCPP_PUSH_MACROS
32#include <__undef_macros>
33
34#if _LIBCPP_STD_VER >= 20
35
36_LIBCPP_BEGIN_NAMESPACE_STD
37
38namespace ranges {
39
40template <class _InIter1, class _InIter2, class _OutIter>
41using set_intersection_result = in_in_out_result<_InIter1, _InIter2, _OutIter>;
42
43namespace __set_intersection {
44
45struct __fn {
46  template <input_iterator _InIter1,
47            sentinel_for<_InIter1> _Sent1,
48            input_iterator _InIter2,
49            sentinel_for<_InIter2> _Sent2,
50            weakly_incrementable _OutIter,
51            class _Comp  = less,
52            class _Proj1 = identity,
53            class _Proj2 = identity>
54    requires mergeable<_InIter1, _InIter2, _OutIter, _Comp, _Proj1, _Proj2>
55  _LIBCPP_HIDE_FROM_ABI constexpr set_intersection_result<_InIter1, _InIter2, _OutIter> operator()(
56      _InIter1 __first1,
57      _Sent1 __last1,
58      _InIter2 __first2,
59      _Sent2 __last2,
60      _OutIter __result,
61      _Comp __comp   = {},
62      _Proj1 __proj1 = {},
63      _Proj2 __proj2 = {}) const {
64    auto __ret = std::__set_intersection<_RangeAlgPolicy>(
65        std::move(__first1),
66        std::move(__last1),
67        std::move(__first2),
68        std::move(__last2),
69        std::move(__result),
70        ranges::__make_projected_comp(__comp, __proj1, __proj2));
71    return {std::move(__ret.__in1_), std::move(__ret.__in2_), std::move(__ret.__out_)};
72  }
73
74  template <input_range _Range1,
75            input_range _Range2,
76            weakly_incrementable _OutIter,
77            class _Comp  = less,
78            class _Proj1 = identity,
79            class _Proj2 = identity>
80    requires mergeable<iterator_t<_Range1>, iterator_t<_Range2>, _OutIter, _Comp, _Proj1, _Proj2>
81  _LIBCPP_HIDE_FROM_ABI constexpr set_intersection_result<borrowed_iterator_t<_Range1>,
82                                                          borrowed_iterator_t<_Range2>,
83                                                          _OutIter>
84  operator()(_Range1&& __range1,
85             _Range2&& __range2,
86             _OutIter __result,
87             _Comp __comp   = {},
88             _Proj1 __proj1 = {},
89             _Proj2 __proj2 = {}) const {
90    auto __ret = std::__set_intersection<_RangeAlgPolicy>(
91        ranges::begin(__range1),
92        ranges::end(__range1),
93        ranges::begin(__range2),
94        ranges::end(__range2),
95        std::move(__result),
96        ranges::__make_projected_comp(__comp, __proj1, __proj2));
97    return {std::move(__ret.__in1_), std::move(__ret.__in2_), std::move(__ret.__out_)};
98  }
99};
100
101} // namespace __set_intersection
102
103inline namespace __cpo {
104inline constexpr auto set_intersection = __set_intersection::__fn{};
105} // namespace __cpo
106} // namespace ranges
107
108_LIBCPP_END_NAMESPACE_STD
109
110#endif // _LIBCPP_STD_VER >= 20
111
112_LIBCPP_POP_MACROS
113
114#endif // _LIBCPP___ALGORITHM_RANGES_SET_INTERSECTION_H
115