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_PSTL_FIND_H
10#define _LIBCPP___ALGORITHM_PSTL_FIND_H
11
12#include <__algorithm/comp.h>
13#include <__algorithm/find.h>
14#include <__algorithm/pstl_backend.h>
15#include <__algorithm/pstl_frontend_dispatch.h>
16#include <__config>
17#include <__iterator/cpp17_iterator_concepts.h>
18#include <__type_traits/enable_if.h>
19#include <__type_traits/is_execution_policy.h>
20#include <__type_traits/remove_cvref.h>
21#include <__utility/move.h>
22#include <optional>
23
24#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
25#  pragma GCC system_header
26#endif
27
28_LIBCPP_PUSH_MACROS
29#include <__undef_macros>
30
31#if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
32
33_LIBCPP_BEGIN_NAMESPACE_STD
34
35template <class _ExecutionPolicy,
36          class _ForwardIterator,
37          class _Predicate,
38          class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
39          enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
40[[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<__remove_cvref_t<_ForwardIterator>>
41__find_if(_ExecutionPolicy&&, _ForwardIterator&& __first, _ForwardIterator&& __last, _Predicate&& __pred) noexcept {
42  using _Backend = typename __select_backend<_RawPolicy>::type;
43  return std::__pstl_find_if<_RawPolicy>(_Backend{}, std::move(__first), std::move(__last), std::move(__pred));
44}
45
46template <class _ExecutionPolicy,
47          class _ForwardIterator,
48          class _Predicate,
49          class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
50          enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
51_LIBCPP_HIDE_FROM_ABI _ForwardIterator
52find_if(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) {
53  _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator);
54  auto __res = std::__find_if(__policy, std::move(__first), std::move(__last), std::move(__pred));
55  if (!__res)
56    std::__throw_bad_alloc();
57  return *std::move(__res);
58}
59
60template <class>
61void __pstl_find_if_not();
62
63template <class _ExecutionPolicy,
64          class _ForwardIterator,
65          class _Predicate,
66          class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
67          enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
68[[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<__remove_cvref_t<_ForwardIterator>>
69__find_if_not(_ExecutionPolicy&& __policy, _ForwardIterator&& __first, _ForwardIterator&& __last, _Predicate&& __pred) {
70  return std::__pstl_frontend_dispatch(
71      _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_find_if_not, _RawPolicy),
72      [&](_ForwardIterator&& __g_first, _ForwardIterator&& __g_last, _Predicate&& __g_pred)
73          -> optional<__remove_cvref_t<_ForwardIterator>> {
74        return std::__find_if(
75            __policy, __g_first, __g_last, [&](__iter_reference<__remove_cvref_t<_ForwardIterator>> __value) {
76              return !__g_pred(__value);
77            });
78      },
79      std::move(__first),
80      std::move(__last),
81      std::move(__pred));
82}
83
84template <class _ExecutionPolicy,
85          class _ForwardIterator,
86          class _Predicate,
87          class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
88          enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
89_LIBCPP_HIDE_FROM_ABI _ForwardIterator
90find_if_not(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) {
91  _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator);
92  auto __res = std::__find_if_not(__policy, std::move(__first), std::move(__last), std::move(__pred));
93  if (!__res)
94    std::__throw_bad_alloc();
95  return *std::move(__res);
96}
97
98template <class>
99void __pstl_find();
100
101template <class _ExecutionPolicy,
102          class _ForwardIterator,
103          class _Tp,
104          class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
105          enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
106[[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<__remove_cvref_t<_ForwardIterator>>
107__find(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, const _Tp& __value) noexcept {
108  return std::__pstl_frontend_dispatch(
109      _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_find, _RawPolicy),
110      [&](_ForwardIterator __g_first, _ForwardIterator __g_last, const _Tp& __g_value) -> optional<_ForwardIterator> {
111        return std::find_if(
112            __policy, __g_first, __g_last, [&](__iter_reference<__remove_cvref_t<_ForwardIterator>> __element) {
113              return __element == __g_value;
114            });
115      },
116      std::move(__first),
117      std::move(__last),
118      __value);
119}
120
121template <class _ExecutionPolicy,
122          class _ForwardIterator,
123          class _Tp,
124          class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
125          enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
126_LIBCPP_HIDE_FROM_ABI _ForwardIterator
127find(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, const _Tp& __value) {
128  _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator);
129  auto __res = std::__find(__policy, std::move(__first), std::move(__last), __value);
130  if (!__res)
131    std::__throw_bad_alloc();
132  return *std::move(__res);
133}
134
135_LIBCPP_END_NAMESPACE_STD
136
137#endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
138
139_LIBCPP_POP_MACROS
140
141#endif // _LIBCPP___ALGORITHM_PSTL_FIND_H
142