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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_UNIQUE_COPY_H
10#define _LIBCPP___ALGORITHM_RANGES_UNIQUE_COPY_H
11
12#include <__algorithm/in_out_result.h>
13#include <__algorithm/iterator_operations.h>
14#include <__algorithm/make_projected.h>
15#include <__algorithm/unique_copy.h>
16#include <__concepts/same_as.h>
17#include <__config>
18#include <__functional/identity.h>
19#include <__functional/invoke.h>
20#include <__functional/ranges_operations.h>
21#include <__iterator/concepts.h>
22#include <__iterator/iterator_traits.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#include <__utility/pair.h>
30
31#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
32# pragma GCC system_header
33#endif
34
35_LIBCPP_PUSH_MACROS
36#include <__undef_macros>
37
38#if _LIBCPP_STD_VER >= 20
39
40_LIBCPP_BEGIN_NAMESPACE_STD
41
42namespace ranges {
43
44template <class _InIter, class _OutIter>
45using unique_copy_result = in_out_result<_InIter, _OutIter>;
46
47template <class _InIter, class _OutIter>
48concept __can_reread_from_output = (input_iterator<_OutIter> && same_as<iter_value_t<_InIter>, iter_value_t<_OutIter>>);
49
50struct __unique_copy {
51 template <class _InIter, class _OutIter>
52 static consteval auto __get_algo_tag() {
53 if constexpr (forward_iterator<_InIter>) {
54 return __unique_copy_tags::__reread_from_input_tag{};
55 } else if constexpr (__can_reread_from_output<_InIter, _OutIter>) {
56 return __unique_copy_tags::__reread_from_output_tag{};
57 } else if constexpr (indirectly_copyable_storable<_InIter, _OutIter>) {
58 return __unique_copy_tags::__read_from_tmp_value_tag{};
59 }
60 }
61
62 template <class _InIter, class _OutIter>
63 using __algo_tag_t _LIBCPP_NODEBUG = decltype(__get_algo_tag<_InIter, _OutIter>());
64
65 template <input_iterator _InIter,
66 sentinel_for<_InIter> _Sent,
67 weakly_incrementable _OutIter,
68 class _Proj = identity,
69 indirect_equivalence_relation<projected<_InIter, _Proj>> _Comp = ranges::equal_to>
70 requires indirectly_copyable<_InIter, _OutIter> &&
71 (forward_iterator<_InIter> ||
72 (input_iterator<_OutIter> && same_as<iter_value_t<_InIter>, iter_value_t<_OutIter>>) ||
73 indirectly_copyable_storable<_InIter, _OutIter>)
74 _LIBCPP_HIDE_FROM_ABI constexpr unique_copy_result<_InIter, _OutIter>
75 operator()(_InIter __first, _Sent __last, _OutIter __result, _Comp __comp = {}, _Proj __proj = {}) const {
76 auto __ret = std::__unique_copy<_RangeAlgPolicy>(
77 std::move(__first),
78 std::move(__last),
79 std::move(__result),
80 std::__make_projected(__comp, __proj),
81 __algo_tag_t<_InIter, _OutIter>());
82 return {std::move(__ret.first), std::move(__ret.second)};
83 }
84
85 template <input_range _Range,
86 weakly_incrementable _OutIter,
87 class _Proj = identity,
88 indirect_equivalence_relation<projected<iterator_t<_Range>, _Proj>> _Comp = ranges::equal_to>
89 requires indirectly_copyable<iterator_t<_Range>, _OutIter> &&
90 (forward_iterator<iterator_t<_Range>> ||
91 (input_iterator<_OutIter> && same_as<range_value_t<_Range>, iter_value_t<_OutIter>>) ||
92 indirectly_copyable_storable<iterator_t<_Range>, _OutIter>)
93 _LIBCPP_HIDE_FROM_ABI constexpr unique_copy_result<borrowed_iterator_t<_Range>, _OutIter>
94 operator()(_Range&& __range, _OutIter __result, _Comp __comp = {}, _Proj __proj = {}) const {
95 auto __ret = std::__unique_copy<_RangeAlgPolicy>(
96 ranges::begin(__range),
97 ranges::end(__range),
98 std::move(__result),
99 std::__make_projected(__comp, __proj),
100 __algo_tag_t<iterator_t<_Range>, _OutIter>());
101 return {std::move(__ret.first), std::move(__ret.second)};
102 }
103};
104
105inline namespace __cpo {
106inline constexpr auto unique_copy = __unique_copy{};
107} // namespace __cpo
108} // namespace ranges
109
110_LIBCPP_END_NAMESPACE_STD
111
112#endif // _LIBCPP_STD_VER >= 20
113
114_LIBCPP_POP_MACROS
115
116#endif // _LIBCPP___ALGORITHM_RANGES_UNIQUE_COPY_H
117

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source code of libcxx/include/__algorithm/ranges_unique_copy.h