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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_PARTITION_COPY_H
10#define _LIBCPP___ALGORITHM_RANGES_PARTITION_COPY_H
11
12#include <__algorithm/in_out_out_result.h>
13#include <__config>
14#include <__functional/identity.h>
15#include <__functional/invoke.h>
16#include <__iterator/concepts.h>
17#include <__iterator/iterator_traits.h>
18#include <__iterator/projected.h>
19#include <__ranges/access.h>
20#include <__ranges/concepts.h>
21#include <__ranges/dangling.h>
22#include <__type_traits/remove_cvref.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 {
37
38template <class _InIter, class _OutIter1, class _OutIter2>
39using partition_copy_result = in_out_out_result<_InIter, _OutIter1, _OutIter2>;
40
41struct __partition_copy {
42 // TODO(ranges): delegate to the classic algorithm.
43 template <class _InIter, class _Sent, class _OutIter1, class _OutIter2, class _Proj, class _Pred>
44 _LIBCPP_HIDE_FROM_ABI constexpr static partition_copy_result<__remove_cvref_t<_InIter>,
45 __remove_cvref_t<_OutIter1>,
46 __remove_cvref_t<_OutIter2> >
47 __partition_copy_fn_impl(
48 _InIter&& __first,
49 _Sent&& __last,
50 _OutIter1&& __out_true,
51 _OutIter2&& __out_false,
52 _Pred& __pred,
53 _Proj& __proj) {
54 for (; __first != __last; ++__first) {
55 if (std::invoke(__pred, std::invoke(__proj, *__first))) {
56 *__out_true = *__first;
57 ++__out_true;
58
59 } else {
60 *__out_false = *__first;
61 ++__out_false;
62 }
63 }
64
65 return {std::move(__first), std::move(__out_true), std::move(__out_false)};
66 }
67
68 template <input_iterator _InIter,
69 sentinel_for<_InIter> _Sent,
70 weakly_incrementable _OutIter1,
71 weakly_incrementable _OutIter2,
72 class _Proj = identity,
73 indirect_unary_predicate<projected<_InIter, _Proj>> _Pred>
74 requires indirectly_copyable<_InIter, _OutIter1> && indirectly_copyable<_InIter, _OutIter2>
75 _LIBCPP_HIDE_FROM_ABI constexpr partition_copy_result<_InIter, _OutIter1, _OutIter2> operator()(
76 _InIter __first, _Sent __last, _OutIter1 __out_true, _OutIter2 __out_false, _Pred __pred, _Proj __proj = {})
77 const {
78 return __partition_copy_fn_impl(
79 std::move(__first), std::move(__last), std::move(__out_true), std::move(__out_false), __pred, __proj);
80 }
81
82 template <input_range _Range,
83 weakly_incrementable _OutIter1,
84 weakly_incrementable _OutIter2,
85 class _Proj = identity,
86 indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
87 requires indirectly_copyable<iterator_t<_Range>, _OutIter1> && indirectly_copyable<iterator_t<_Range>, _OutIter2>
88 _LIBCPP_HIDE_FROM_ABI constexpr partition_copy_result<borrowed_iterator_t<_Range>, _OutIter1, _OutIter2>
89 operator()(_Range&& __range, _OutIter1 __out_true, _OutIter2 __out_false, _Pred __pred, _Proj __proj = {}) const {
90 return __partition_copy_fn_impl(
91 ranges::begin(__range), ranges::end(__range), std::move(__out_true), std::move(__out_false), __pred, __proj);
92 }
93};
94
95inline namespace __cpo {
96inline constexpr auto partition_copy = __partition_copy{};
97} // namespace __cpo
98} // namespace ranges
99
100_LIBCPP_END_NAMESPACE_STD
101
102#endif // _LIBCPP_STD_VER >= 20
103
104_LIBCPP_POP_MACROS
105
106#endif // _LIBCPP___ALGORITHM_RANGES_PARTITION_COPY_H