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
32template <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>>
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
49template <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>
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
70template <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>>
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
89template <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>
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