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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_SEARCH_H
10#define _LIBCPP___ALGORITHM_RANGES_SEARCH_H
11
12#include <__algorithm/iterator_operations.h>
13#include <__algorithm/search.h>
14#include <__config>
15#include <__functional/identity.h>
16#include <__functional/ranges_operations.h>
17#include <__iterator/advance.h>
18#include <__iterator/concepts.h>
19#include <__iterator/distance.h>
20#include <__iterator/indirectly_comparable.h>
21#include <__ranges/access.h>
22#include <__ranges/concepts.h>
23#include <__ranges/size.h>
24#include <__ranges/subrange.h>
25#include <__utility/pair.h>
26
27#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
28# pragma GCC system_header
29#endif
30
31#if _LIBCPP_STD_VER >= 20
32
33_LIBCPP_BEGIN_NAMESPACE_STD
34
35namespace ranges {
36struct __search {
37 template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Pred, class _Proj1, class _Proj2>
38 _LIBCPP_HIDE_FROM_ABI static constexpr subrange<_Iter1> __ranges_search_impl(
39 _Iter1 __first1,
40 _Sent1 __last1,
41 _Iter2 __first2,
42 _Sent2 __last2,
43 _Pred& __pred,
44 _Proj1& __proj1,
45 _Proj2& __proj2) {
46 if constexpr (sized_sentinel_for<_Sent2, _Iter2>) {
47 auto __size2 = ranges::distance(__first2, __last2);
48 if (__size2 == 0)
49 return {__first1, __first1};
50
51 if constexpr (sized_sentinel_for<_Sent1, _Iter1>) {
52 auto __size1 = ranges::distance(__first1, __last1);
53 if (__size1 < __size2) {
54 ranges::advance(__first1, __last1);
55 return {__first1, __first1};
56 }
57
58 if constexpr (random_access_iterator<_Iter1> && random_access_iterator<_Iter2>) {
59 auto __ret = std::__search_random_access_impl<_RangeAlgPolicy>(
60 __first1, __last1, __first2, __last2, __pred, __proj1, __proj2, __size1, __size2);
61 return {__ret.first, __ret.second};
62 }
63 }
64 }
65
66 auto __ret =
67 std::__search_forward_impl<_RangeAlgPolicy>(__first1, __last1, __first2, __last2, __pred, __proj1, __proj2);
68 return {__ret.first, __ret.second};
69 }
70
71 template <forward_iterator _Iter1,
72 sentinel_for<_Iter1> _Sent1,
73 forward_iterator _Iter2,
74 sentinel_for<_Iter2> _Sent2,
75 class _Pred = ranges::equal_to,
76 class _Proj1 = identity,
77 class _Proj2 = identity>
78 requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
79 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr subrange<_Iter1> operator()(
80 _Iter1 __first1,
81 _Sent1 __last1,
82 _Iter2 __first2,
83 _Sent2 __last2,
84 _Pred __pred = {},
85 _Proj1 __proj1 = {},
86 _Proj2 __proj2 = {}) const {
87 return __ranges_search_impl(__first1, __last1, __first2, __last2, __pred, __proj1, __proj2);
88 }
89
90 template <forward_range _Range1,
91 forward_range _Range2,
92 class _Pred = ranges::equal_to,
93 class _Proj1 = identity,
94 class _Proj2 = identity>
95 requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2>
96 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr borrowed_subrange_t<_Range1> operator()(
97 _Range1&& __range1, _Range2&& __range2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const {
98 auto __first1 = ranges::begin(__range1);
99 if constexpr (sized_range<_Range2>) {
100 auto __size2 = ranges::size(__range2);
101 if (__size2 == 0)
102 return {__first1, __first1};
103 if constexpr (sized_range<_Range1>) {
104 auto __size1 = ranges::size(__range1);
105 if (__size1 < __size2) {
106 ranges::advance(__first1, ranges::end(__range1));
107 return {__first1, __first1};
108 }
109 }
110 }
111
112 return __ranges_search_impl(
113 ranges::begin(__range1),
114 ranges::end(__range1),
115 ranges::begin(__range2),
116 ranges::end(__range2),
117 __pred,
118 __proj1,
119 __proj2);
120 }
121};
122
123inline namespace __cpo {
124inline constexpr auto search = __search{};
125} // namespace __cpo
126} // namespace ranges
127
128_LIBCPP_END_NAMESPACE_STD
129
130#endif // _LIBCPP_STD_VER >= 20
131
132#endif // _LIBCPP___ALGORITHM_RANGES_SEARCH_H