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_TRANSFORM_H
10 #define _LIBCPP___ALGORITHM_PSTL_TRANSFORM_H
11
12 #include <__algorithm/pstl_backend.h>
13 #include <__config>
14 #include <__iterator/cpp17_iterator_concepts.h>
15 #include <__type_traits/enable_if.h>
16 #include <__type_traits/is_execution_policy.h>
17 #include <__type_traits/remove_cvref.h>
18 #include <__utility/move.h>
19 #include <optional>
20
21 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
22 # pragma GCC system_header
23 #endif
24
25 _LIBCPP_PUSH_MACROS
26 #include <__undef_macros>
27
28 #if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
29
30 _LIBCPP_BEGIN_NAMESPACE_STD
31
32 template <class _ExecutionPolicy,
33 class _ForwardIterator,
34 class _ForwardOutIterator,
35 class _UnaryOperation,
36 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
37 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
38 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<__remove_cvref_t<_ForwardOutIterator>>
__transform(_ExecutionPolicy &&,_ForwardIterator && __first,_ForwardIterator && __last,_ForwardOutIterator && __result,_UnaryOperation && __op)39 __transform(_ExecutionPolicy&&,
40 _ForwardIterator&& __first,
41 _ForwardIterator&& __last,
42 _ForwardOutIterator&& __result,
43 _UnaryOperation&& __op) noexcept {
44 using _Backend = typename __select_backend<_RawPolicy>::type;
45 return std::__pstl_transform<_RawPolicy>(
46 _Backend{}, std::move(__first), std::move(__last), std::move(__result), std::move(__op));
47 }
48
49 template <class _ExecutionPolicy,
50 class _ForwardIterator,
51 class _ForwardOutIterator,
52 class _UnaryOperation,
53 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
54 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
transform(_ExecutionPolicy && __policy,_ForwardIterator __first,_ForwardIterator __last,_ForwardOutIterator __result,_UnaryOperation __op)55 _LIBCPP_HIDE_FROM_ABI _ForwardOutIterator transform(
56 _ExecutionPolicy&& __policy,
57 _ForwardIterator __first,
58 _ForwardIterator __last,
59 _ForwardOutIterator __result,
60 _UnaryOperation __op) {
61 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator);
62 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardOutIterator);
63 _LIBCPP_REQUIRE_CPP17_OUTPUT_ITERATOR(_ForwardOutIterator, decltype(__op(*__first)));
64 auto __res = std::__transform(__policy, std::move(__first), std::move(__last), std::move(__result), std::move(__op));
65 if (!__res)
66 std::__throw_bad_alloc();
67 return *std::move(__res);
68 }
69
70 template <class _ExecutionPolicy,
71 class _ForwardIterator1,
72 class _ForwardIterator2,
73 class _ForwardOutIterator,
74 class _BinaryOperation,
75 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
76 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
77 _LIBCPP_HIDE_FROM_ABI optional<__remove_cvref_t<_ForwardOutIterator>>
__transform(_ExecutionPolicy &&,_ForwardIterator1 && __first1,_ForwardIterator1 && __last1,_ForwardIterator2 && __first2,_ForwardOutIterator && __result,_BinaryOperation && __op)78 __transform(_ExecutionPolicy&&,
79 _ForwardIterator1&& __first1,
80 _ForwardIterator1&& __last1,
81 _ForwardIterator2&& __first2,
82 _ForwardOutIterator&& __result,
83 _BinaryOperation&& __op) noexcept {
84 using _Backend = typename __select_backend<_RawPolicy>::type;
85 return std::__pstl_transform<_RawPolicy>(
86 _Backend{}, std::move(__first1), std::move(__last1), std::move(__first2), std::move(__result), std::move(__op));
87 }
88
89 template <class _ExecutionPolicy,
90 class _ForwardIterator1,
91 class _ForwardIterator2,
92 class _ForwardOutIterator,
93 class _BinaryOperation,
94 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
95 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
transform(_ExecutionPolicy && __policy,_ForwardIterator1 __first1,_ForwardIterator1 __last1,_ForwardIterator2 __first2,_ForwardOutIterator __result,_BinaryOperation __op)96 _LIBCPP_HIDE_FROM_ABI _ForwardOutIterator transform(
97 _ExecutionPolicy&& __policy,
98 _ForwardIterator1 __first1,
99 _ForwardIterator1 __last1,
100 _ForwardIterator2 __first2,
101 _ForwardOutIterator __result,
102 _BinaryOperation __op) {
103 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator1);
104 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator2);
105 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardOutIterator);
106 _LIBCPP_REQUIRE_CPP17_OUTPUT_ITERATOR(_ForwardOutIterator, decltype(__op(*__first1, *__first2)));
107 auto __res = std::__transform(
108 __policy, std::move(__first1), std::move(__last1), std::move(__first2), std::move(__result), std::move(__op));
109 if (!__res)
110 std::__throw_bad_alloc();
111 return *std::move(__res);
112 }
113
114 _LIBCPP_END_NAMESPACE_STD
115
116 #endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
117
118 _LIBCPP_POP_MACROS
119
120 #endif // _LIBCPP___ALGORITHM_PSTL_TRANSFORM_H
121