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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_ENDS_WITH_H
10#define _LIBCPP___ALGORITHM_RANGES_ENDS_WITH_H
11
12#include <__algorithm/ranges_equal.h>
13#include <__algorithm/ranges_starts_with.h>
14#include <__config>
15#include <__functional/identity.h>
16#include <__functional/ranges_operations.h>
17#include <__functional/reference_wrapper.h>
18#include <__iterator/advance.h>
19#include <__iterator/concepts.h>
20#include <__iterator/distance.h>
21#include <__iterator/indirectly_comparable.h>
22#include <__iterator/reverse_iterator.h>
23#include <__ranges/access.h>
24#include <__ranges/concepts.h>
25#include <__ranges/size.h>
26#include <__utility/move.h>
27
28#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
29# pragma GCC system_header
30#endif
31
32_LIBCPP_PUSH_MACROS
33#include <__undef_macros>
34
35#if _LIBCPP_STD_VER >= 23
36
37_LIBCPP_BEGIN_NAMESPACE_STD
38
39namespace ranges {
40struct __ends_with {
41 template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Pred, class _Proj1, class _Proj2>
42 _LIBCPP_HIDE_FROM_ABI static constexpr bool __ends_with_fn_impl_bidirectional(
43 _Iter1 __first1,
44 _Sent1 __last1,
45 _Iter2 __first2,
46 _Sent2 __last2,
47 _Pred& __pred,
48 _Proj1& __proj1,
49 _Proj2& __proj2) {
50 auto __rbegin1 = std::make_reverse_iterator(__last1);
51 auto __rend1 = std::make_reverse_iterator(__first1);
52 auto __rbegin2 = std::make_reverse_iterator(__last2);
53 auto __rend2 = std::make_reverse_iterator(__first2);
54 return ranges::starts_with(
55 __rbegin1, __rend1, __rbegin2, __rend2, std::ref(__pred), std::ref(__proj1), std::ref(__proj2));
56 }
57
58 template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Pred, class _Proj1, class _Proj2>
59 _LIBCPP_HIDE_FROM_ABI static constexpr bool __ends_with_fn_impl(
60 _Iter1 __first1,
61 _Sent1 __last1,
62 _Iter2 __first2,
63 _Sent2 __last2,
64 _Pred& __pred,
65 _Proj1& __proj1,
66 _Proj2& __proj2) {
67 if constexpr (std::bidirectional_iterator<_Sent1> && std::bidirectional_iterator<_Sent2> &&
68 (!std::random_access_iterator<_Sent1>) && (!std::random_access_iterator<_Sent2>)) {
69 return __ends_with_fn_impl_bidirectional(__first1, __last1, __first2, __last2, __pred, __proj1, __proj2);
70
71 } else {
72 auto __n1 = ranges::distance(__first1, __last1);
73 auto __n2 = ranges::distance(__first2, __last2);
74 if (__n2 == 0)
75 return true;
76 if (__n2 > __n1)
77 return false;
78
79 return __ends_with_fn_impl_with_offset(
80 std::move(__first1),
81 std::move(__last1),
82 std::move(__first2),
83 std::move(__last2),
84 __pred,
85 __proj1,
86 __proj2,
87 __n1 - __n2);
88 }
89 }
90
91 template <class _Iter1,
92 class _Sent1,
93 class _Iter2,
94 class _Sent2,
95 class _Pred,
96 class _Proj1,
97 class _Proj2,
98 class _Offset>
99 static _LIBCPP_HIDE_FROM_ABI constexpr bool __ends_with_fn_impl_with_offset(
100 _Iter1 __first1,
101 _Sent1 __last1,
102 _Iter2 __first2,
103 _Sent2 __last2,
104 _Pred& __pred,
105 _Proj1& __proj1,
106 _Proj2& __proj2,
107 _Offset __offset) {
108 if constexpr (std::bidirectional_iterator<_Sent1> && std::bidirectional_iterator<_Sent2> &&
109 !std::random_access_iterator<_Sent1> && !std::random_access_iterator<_Sent2>) {
110 return __ends_with_fn_impl_bidirectional(
111 std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __pred, __proj1, __proj2);
112
113 } else {
114 ranges::advance(__first1, __offset);
115 return ranges::equal(
116 std::move(__first1),
117 std::move(__last1),
118 std::move(__first2),
119 std::move(__last2),
120 std::ref(__pred),
121 std::ref(__proj1),
122 std::ref(__proj2));
123 }
124 }
125
126 template <input_iterator _Iter1,
127 sentinel_for<_Iter1> _Sent1,
128 input_iterator _Iter2,
129 sentinel_for<_Iter2> _Sent2,
130 class _Pred = ranges::equal_to,
131 class _Proj1 = identity,
132 class _Proj2 = identity>
133 requires(forward_iterator<_Iter1> || sized_sentinel_for<_Sent1, _Iter1>) &&
134 (forward_iterator<_Iter2> || sized_sentinel_for<_Sent2, _Iter2>) &&
135 indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
136 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(
137 _Iter1 __first1,
138 _Sent1 __last1,
139 _Iter2 __first2,
140 _Sent2 __last2,
141 _Pred __pred = {},
142 _Proj1 __proj1 = {},
143 _Proj2 __proj2 = {}) const {
144 return __ends_with_fn_impl(
145 std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __pred, __proj1, __proj2);
146 }
147
148 template <input_range _Range1,
149 input_range _Range2,
150 class _Pred = ranges::equal_to,
151 class _Proj1 = identity,
152 class _Proj2 = identity>
153 requires(forward_range<_Range1> || sized_range<_Range1>) && (forward_range<_Range2> || sized_range<_Range2>) &&
154 indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2>
155 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(
156 _Range1&& __range1, _Range2&& __range2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const {
157 if constexpr (sized_range<_Range1> && sized_range<_Range2>) {
158 auto __n1 = ranges::size(__range1);
159 auto __n2 = ranges::size(__range2);
160 if (__n2 == 0)
161 return true;
162 if (__n2 > __n1)
163 return false;
164 auto __offset = __n1 - __n2;
165
166 return __ends_with_fn_impl_with_offset(
167 ranges::begin(__range1),
168 ranges::end(__range1),
169 ranges::begin(__range2),
170 ranges::end(__range2),
171 __pred,
172 __proj1,
173 __proj2,
174 __offset);
175
176 } else {
177 return __ends_with_fn_impl(
178 ranges::begin(__range1),
179 ranges::end(__range1),
180 ranges::begin(__range2),
181 ranges::end(__range2),
182 __pred,
183 __proj1,
184 __proj2);
185 }
186 }
187};
188
189inline namespace __cpo {
190inline constexpr auto ends_with = __ends_with{};
191} // namespace __cpo
192} // namespace ranges
193
194_LIBCPP_END_NAMESPACE_STD
195
196#endif // _LIBCPP_STD_VER >= 23
197
198_LIBCPP_POP_MACROS
199
200#endif // _LIBCPP___ALGORITHM_RANGES_ENDS_WITH_H