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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_EQUAL_H
10#define _LIBCPP___ALGORITHM_RANGES_EQUAL_H
11
12#include <__algorithm/equal.h>
13#include <__algorithm/unwrap_range.h>
14#include <__config>
15#include <__functional/identity.h>
16#include <__functional/invoke.h>
17#include <__functional/ranges_operations.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 <__utility/move.h>
24
25#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
26# pragma GCC system_header
27#endif
28
29_LIBCPP_PUSH_MACROS
30#include <__undef_macros>
31
32#if _LIBCPP_STD_VER >= 20
33
34_LIBCPP_BEGIN_NAMESPACE_STD
35
36namespace ranges {
37struct __equal {
38 template <input_iterator _Iter1,
39 sentinel_for<_Iter1> _Sent1,
40 input_iterator _Iter2,
41 sentinel_for<_Iter2> _Sent2,
42 class _Pred = ranges::equal_to,
43 class _Proj1 = identity,
44 class _Proj2 = identity>
45 requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
46 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(
47 _Iter1 __first1,
48 _Sent1 __last1,
49 _Iter2 __first2,
50 _Sent2 __last2,
51 _Pred __pred = {},
52 _Proj1 __proj1 = {},
53 _Proj2 __proj2 = {}) const {
54 if constexpr (sized_sentinel_for<_Sent1, _Iter1> && sized_sentinel_for<_Sent2, _Iter2>) {
55 if (__last1 - __first1 != __last2 - __first2)
56 return false;
57 }
58 auto __unwrapped1 = std::__unwrap_range(std::move(__first1), std::move(__last1));
59 auto __unwrapped2 = std::__unwrap_range(std::move(__first2), std::move(__last2));
60 return std::__equal_impl(
61 std::move(__unwrapped1.first),
62 std::move(__unwrapped1.second),
63 std::move(__unwrapped2.first),
64 std::move(__unwrapped2.second),
65 __pred,
66 __proj1,
67 __proj2);
68 }
69
70 template <input_range _Range1,
71 input_range _Range2,
72 class _Pred = ranges::equal_to,
73 class _Proj1 = identity,
74 class _Proj2 = identity>
75 requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2>
76 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(
77 _Range1&& __range1, _Range2&& __range2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const {
78 if constexpr (sized_range<_Range1> && sized_range<_Range2>) {
79 if (ranges::distance(__range1) != ranges::distance(__range2))
80 return false;
81 }
82 auto __unwrapped1 = std::__unwrap_range(ranges::begin(__range1), ranges::end(__range1));
83 auto __unwrapped2 = std::__unwrap_range(ranges::begin(__range2), ranges::end(__range2));
84 return std::__equal_impl(
85 std::move(__unwrapped1.first),
86 std::move(__unwrapped1.second),
87 std::move(__unwrapped2.first),
88 std::move(__unwrapped2.second),
89 __pred,
90 __proj1,
91 __proj2);
92 return false;
93 }
94};
95
96inline namespace __cpo {
97inline constexpr auto equal = __equal{};
98} // namespace __cpo
99} // namespace ranges
100
101_LIBCPP_END_NAMESPACE_STD
102
103#endif // _LIBCPP_STD_VER >= 20
104
105_LIBCPP_POP_MACROS
106
107#endif // _LIBCPP___ALGORITHM_RANGES_EQUAL_H