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_H
10#define _LIBCPP___ALGORITHM_RANGES_UNIQUE_H
11
12#include <__algorithm/iterator_operations.h>
13#include <__algorithm/make_projected.h>
14#include <__algorithm/unique.h>
15#include <__config>
16#include <__functional/identity.h>
17#include <__functional/invoke.h>
18#include <__functional/ranges_operations.h>
19#include <__iterator/concepts.h>
20#include <__iterator/iterator_traits.h>
21#include <__iterator/permutable.h>
22#include <__iterator/projected.h>
23#include <__ranges/access.h>
24#include <__ranges/concepts.h>
25#include <__ranges/dangling.h>
26#include <__ranges/subrange.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#if _LIBCPP_STD_VER > 17
36
37_LIBCPP_BEGIN_NAMESPACE_STD
38
39namespace ranges {
40namespace __unique {
41
42  struct __fn {
43    template <
44        permutable _Iter,
45        sentinel_for<_Iter> _Sent,
46        class _Proj                                                  = identity,
47        indirect_equivalence_relation<projected<_Iter, _Proj>> _Comp = ranges::equal_to>
48    _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr subrange<_Iter>
49    operator()(_Iter __first, _Sent __last, _Comp __comp = {}, _Proj __proj = {}) const {
50      auto __ret = std::__unique<_RangeAlgPolicy>(
51          std::move(__first), std::move(__last), std::__make_projected(__comp, __proj));
52      return {std::move(__ret.first), std::move(__ret.second)};
53    }
54
55    template <
56        forward_range _Range,
57        class _Proj                                                               = identity,
58        indirect_equivalence_relation<projected<iterator_t<_Range>, _Proj>> _Comp = ranges::equal_to>
59      requires permutable<iterator_t<_Range>>
60    _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr borrowed_subrange_t<_Range>
61    operator()(_Range&& __range, _Comp __comp = {}, _Proj __proj = {}) const {
62      auto __ret = std::__unique<_RangeAlgPolicy>(
63          ranges::begin(__range), ranges::end(__range), std::__make_projected(__comp, __proj));
64      return {std::move(__ret.first), std::move(__ret.second)};
65    }
66  };
67
68} // namespace __unique
69
70inline namespace __cpo {
71  inline constexpr auto unique = __unique::__fn{};
72} // namespace __cpo
73} // namespace ranges
74
75_LIBCPP_END_NAMESPACE_STD
76
77#endif // _LIBCPP_STD_VER > 17
78
79#endif // _LIBCPP___ALGORITHM_RANGES_UNIQUE_H
80