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___NUMERIC_PSTL_H
10#define _LIBCPP___NUMERIC_PSTL_H
11
12#include <__config>
13
14#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
15# pragma GCC system_header
16#endif
17
18_LIBCPP_PUSH_MACROS
19#include <__undef_macros>
20
21#if _LIBCPP_HAS_EXPERIMENTAL_PSTL && _LIBCPP_STD_VER >= 17
22
23# include <__functional/identity.h>
24# include <__functional/operations.h>
25# include <__iterator/cpp17_iterator_concepts.h>
26# include <__iterator/iterator_traits.h>
27# include <__pstl/backend.h>
28# include <__pstl/dispatch.h>
29# include <__pstl/handle_exception.h>
30# include <__type_traits/enable_if.h>
31# include <__type_traits/is_execution_policy.h>
32# include <__type_traits/remove_cvref.h>
33# include <__utility/forward.h>
34# include <__utility/move.h>
35
36_LIBCPP_BEGIN_NAMESPACE_STD
37
38template <class _ExecutionPolicy,
39 class _ForwardIterator,
40 class _Tp,
41 class _BinaryOperation,
42 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
43 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
44_LIBCPP_HIDE_FROM_ABI _Tp reduce(
45 _ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _Tp __init, _BinaryOperation __op) {
46 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator, "reduce requires ForwardIterators");
47 using _Implementation = __pstl::__dispatch<__pstl::__reduce, __pstl::__current_configuration, _RawPolicy>;
48 return __pstl::__handle_exception<_Implementation>(
49 std::forward<_ExecutionPolicy>(__policy),
50 std::move(__first),
51 std::move(__last),
52 std::move(__init),
53 std::move(__op));
54}
55
56template <class _ExecutionPolicy,
57 class _ForwardIterator,
58 class _Tp,
59 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
60 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
61_LIBCPP_HIDE_FROM_ABI _Tp
62reduce(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _Tp __init) {
63 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator, "reduce requires ForwardIterators");
64 using _Implementation = __pstl::__dispatch<__pstl::__reduce, __pstl::__current_configuration, _RawPolicy>;
65 return __pstl::__handle_exception<_Implementation>(
66 std::forward<_ExecutionPolicy>(__policy), std::move(__first), std::move(__last), std::move(__init), plus{});
67}
68
69template <class _ExecutionPolicy,
70 class _ForwardIterator,
71 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
72 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
73_LIBCPP_HIDE_FROM_ABI __iter_value_type<_ForwardIterator>
74reduce(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last) {
75 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator, "reduce requires ForwardIterators");
76 using _Implementation = __pstl::__dispatch<__pstl::__reduce, __pstl::__current_configuration, _RawPolicy>;
77 return __pstl::__handle_exception<_Implementation>(
78 std::forward<_ExecutionPolicy>(__policy),
79 std::move(__first),
80 std::move(__last),
81 __iter_value_type<_ForwardIterator>(),
82 plus{});
83}
84
85template <class _ExecutionPolicy,
86 class _ForwardIterator1,
87 class _ForwardIterator2,
88 class _Tp,
89 class _BinaryOperation1,
90 class _BinaryOperation2,
91 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
92 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
93_LIBCPP_HIDE_FROM_ABI _Tp transform_reduce(
94 _ExecutionPolicy&& __policy,
95 _ForwardIterator1 __first1,
96 _ForwardIterator1 __last1,
97 _ForwardIterator2 __first2,
98 _Tp __init,
99 _BinaryOperation1 __reduce,
100 _BinaryOperation2 __transform) {
101 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator1, "transform_reduce requires ForwardIterators");
102 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator2, "transform_reduce requires ForwardIterators");
103 using _Implementation =
104 __pstl::__dispatch<__pstl::__transform_reduce_binary, __pstl::__current_configuration, _RawPolicy>;
105 return __pstl::__handle_exception<_Implementation>(
106 std::forward<_ExecutionPolicy>(__policy),
107 std::move(__first1),
108 std::move(__last1),
109 std::move(__first2),
110 std::move(__init),
111 std::move(__reduce),
112 std::move(__transform));
113}
114
115// This overload doesn't get a customization point because it's trivial to detect (through e.g.
116// __desugars_to_v) when specializing the more general variant, which should always be preferred
117template <class _ExecutionPolicy,
118 class _ForwardIterator1,
119 class _ForwardIterator2,
120 class _Tp,
121 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
122 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
123_LIBCPP_HIDE_FROM_ABI _Tp transform_reduce(
124 _ExecutionPolicy&& __policy,
125 _ForwardIterator1 __first1,
126 _ForwardIterator1 __last1,
127 _ForwardIterator2 __first2,
128 _Tp __init) {
129 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator1, "transform_reduce requires ForwardIterators");
130 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator2, "transform_reduce requires ForwardIterators");
131 using _Implementation =
132 __pstl::__dispatch<__pstl::__transform_reduce_binary, __pstl::__current_configuration, _RawPolicy>;
133 return __pstl::__handle_exception<_Implementation>(
134 std::forward<_ExecutionPolicy>(__policy),
135 std::move(__first1),
136 std::move(__last1),
137 std::move(__first2),
138 std::move(__init),
139 plus{},
140 multiplies{});
141}
142
143template <class _ExecutionPolicy,
144 class _ForwardIterator,
145 class _Tp,
146 class _BinaryOperation,
147 class _UnaryOperation,
148 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
149 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
150_LIBCPP_HIDE_FROM_ABI _Tp transform_reduce(
151 _ExecutionPolicy&& __policy,
152 _ForwardIterator __first,
153 _ForwardIterator __last,
154 _Tp __init,
155 _BinaryOperation __reduce,
156 _UnaryOperation __transform) {
157 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator, "transform_reduce requires ForwardIterators");
158 using _Implementation = __pstl::__dispatch<__pstl::__transform_reduce, __pstl::__current_configuration, _RawPolicy>;
159 return __pstl::__handle_exception<_Implementation>(
160 std::forward<_ExecutionPolicy>(__policy),
161 std::move(__first),
162 std::move(__last),
163 std::move(__init),
164 std::move(__reduce),
165 std::move(__transform));
166}
167
168_LIBCPP_END_NAMESPACE_STD
169
170#endif // _LIBCPP_HAS_EXPERIMENTAL_PSTL && _LIBCPP_STD_VER >= 17
171
172_LIBCPP_POP_MACROS
173
174#endif // _LIBCPP___NUMERIC_PSTL_H
175