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_MOVE_H
10#define _LIBCPP___ALGORITHM_PSTL_MOVE_H
11
12#include <__algorithm/copy_n.h>
13#include <__algorithm/pstl_backend.h>
14#include <__algorithm/pstl_frontend_dispatch.h>
15#include <__algorithm/pstl_transform.h>
16#include <__config>
17#include <__functional/identity.h>
18#include <__iterator/iterator_traits.h>
19#include <__type_traits/enable_if.h>
20#include <__type_traits/is_constant_evaluated.h>
21#include <__type_traits/is_execution_policy.h>
22#include <__type_traits/is_trivially_copyable.h>
23#include <__type_traits/remove_cvref.h>
24#include <optional>
25
26#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
27#  pragma GCC system_header
28#endif
29
30_LIBCPP_PUSH_MACROS
31#include <__undef_macros>
32
33#if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
34
35_LIBCPP_BEGIN_NAMESPACE_STD
36
37// TODO: Use the std::copy/move shenanigans to forward to std::memmove
38//       Investigate whether we want to still forward to std::transform(policy)
39//       in that case for the execution::par part, or whether we actually want
40//       to run everything serially in that case.
41
42template <class>
43void __pstl_move();
44
45template <class _ExecutionPolicy,
46          class _ForwardIterator,
47          class _ForwardOutIterator,
48          class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
49          enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
50[[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<_ForwardOutIterator>
51__move(_ExecutionPolicy&& __policy,
52       _ForwardIterator&& __first,
53       _ForwardIterator&& __last,
54       _ForwardOutIterator&& __result) noexcept {
55  return std::__pstl_frontend_dispatch(
56      _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_move, _RawPolicy),
57      [&__policy](_ForwardIterator __g_first, _ForwardIterator __g_last, _ForwardOutIterator __g_result) {
58        return std::__transform(__policy, __g_first, __g_last, __g_result, [](auto&& __v) { return std::move(__v); });
59      },
60      std::move(__first),
61      std::move(__last),
62      std::move(__result));
63}
64
65template <class _ExecutionPolicy,
66          class _ForwardIterator,
67          class _ForwardOutIterator,
68          class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
69          enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
70_LIBCPP_HIDE_FROM_ABI _ForwardOutIterator
71move(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _ForwardOutIterator __result) {
72  auto __res = std::__move(__policy, std::move(__first), std::move(__last), std::move(__result));
73  if (!__res)
74    std::__throw_bad_alloc();
75  return *__res;
76}
77
78_LIBCPP_END_NAMESPACE_STD
79
80#endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
81
82_LIBCPP_POP_MACROS
83
84#endif // _LIBCPP___ALGORITHM_PSTL_MOVE_H
85