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_H
10#define _LIBCPP___ALGORITHM_RANGES_PARTITION_H
11
12#include <__algorithm/iterator_operations.h>
13#include <__algorithm/make_projected.h>
14#include <__algorithm/partition.h>
15#include <__algorithm/ranges_iterator_concept.h>
16#include <__config>
17#include <__functional/identity.h>
18#include <__functional/invoke.h>
19#include <__functional/ranges_operations.h>
20#include <__iterator/concepts.h>
21#include <__iterator/iterator_traits.h>
22#include <__iterator/permutable.h>
23#include <__iterator/projected.h>
24#include <__ranges/access.h>
25#include <__ranges/concepts.h>
26#include <__ranges/subrange.h>
27#include <__type_traits/remove_cvref.h>
28#include <__utility/forward.h>
29#include <__utility/move.h>
30#include <__utility/pair.h>
31
32#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
33# pragma GCC system_header
34#endif
35
36_LIBCPP_PUSH_MACROS
37#include <__undef_macros>
38
39#if _LIBCPP_STD_VER >= 20
40
41_LIBCPP_BEGIN_NAMESPACE_STD
42
43namespace ranges {
44struct __partition {
45 template <class _Iter, class _Sent, class _Proj, class _Pred>
46 _LIBCPP_HIDE_FROM_ABI static constexpr subrange<__remove_cvref_t<_Iter>>
47 __partition_fn_impl(_Iter&& __first, _Sent&& __last, _Pred&& __pred, _Proj&& __proj) {
48 auto&& __projected_pred = std::__make_projected(__pred, __proj);
49 auto __result = std::__partition<_RangeAlgPolicy>(
50 std::move(__first), std::move(__last), __projected_pred, __iterator_concept<_Iter>());
51
52 return {std::move(__result.first), std::move(__result.second)};
53 }
54
55 template <permutable _Iter,
56 sentinel_for<_Iter> _Sent,
57 class _Proj = identity,
58 indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
59 _LIBCPP_HIDE_FROM_ABI constexpr subrange<_Iter>
60 operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) const {
61 return __partition_fn_impl(__first, __last, __pred, __proj);
62 }
63
64 template <forward_range _Range,
65 class _Proj = identity,
66 indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
67 requires permutable<iterator_t<_Range>>
68 _LIBCPP_HIDE_FROM_ABI constexpr borrowed_subrange_t<_Range>
69 operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const {
70 return __partition_fn_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj);
71 }
72};
73
74inline namespace __cpo {
75inline constexpr auto partition = __partition{};
76} // namespace __cpo
77} // namespace ranges
78
79_LIBCPP_END_NAMESPACE_STD
80
81#endif // _LIBCPP_STD_VER >= 20
82
83_LIBCPP_POP_MACROS
84
85#endif // _LIBCPP___ALGORITHM_RANGES_PARTITION_H
86