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_COPY_H
10 #define _LIBCPP___ALGORITHM_PSTL_COPY_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/concepts.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 <__utility/move.h>
25 #include <optional>
26
27 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
28 # pragma GCC system_header
29 #endif
30
31 #if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
32
33 _LIBCPP_BEGIN_NAMESPACE_STD
34
35 // TODO: Use the std::copy/move shenanigans to forward to std::memmove
36
37 template <class>
38 void __pstl_copy();
39
40 template <class _ExecutionPolicy,
41 class _ForwardIterator,
42 class _ForwardOutIterator,
43 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
44 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
45 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<_ForwardOutIterator>
__copy(_ExecutionPolicy && __policy,_ForwardIterator && __first,_ForwardIterator && __last,_ForwardOutIterator && __result)46 __copy(_ExecutionPolicy&& __policy,
47 _ForwardIterator&& __first,
48 _ForwardIterator&& __last,
49 _ForwardOutIterator&& __result) noexcept {
50 return std::__pstl_frontend_dispatch(
51 _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_copy, _RawPolicy),
52 [&__policy](_ForwardIterator __g_first, _ForwardIterator __g_last, _ForwardOutIterator __g_result) {
53 return std::__transform(__policy, __g_first, __g_last, __g_result, __identity());
54 },
55 std::move(__first),
56 std::move(__last),
57 std::move(__result));
58 }
59
60 template <class _ExecutionPolicy,
61 class _ForwardIterator,
62 class _ForwardOutIterator,
63 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
64 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
65 _LIBCPP_HIDE_FROM_ABI _ForwardOutIterator
copy(_ExecutionPolicy && __policy,_ForwardIterator __first,_ForwardIterator __last,_ForwardOutIterator __result)66 copy(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _ForwardOutIterator __result) {
67 auto __res = std::__copy(__policy, std::move(__first), std::move(__last), std::move(__result));
68 if (!__res)
69 std::__throw_bad_alloc();
70 return *std::move(__res);
71 }
72
73 template <class>
74 void __pstl_copy_n();
75
76 template <class _ExecutionPolicy,
77 class _ForwardIterator,
78 class _ForwardOutIterator,
79 class _Size,
80 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
81 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
__copy_n(_ExecutionPolicy && __policy,_ForwardIterator && __first,_Size && __n,_ForwardOutIterator && __result)82 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<_ForwardOutIterator> __copy_n(
83 _ExecutionPolicy&& __policy, _ForwardIterator&& __first, _Size&& __n, _ForwardOutIterator&& __result) noexcept {
84 return std::__pstl_frontend_dispatch(
85 _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_copy_n, _RawPolicy),
86 [&__policy](
87 _ForwardIterator __g_first, _Size __g_n, _ForwardOutIterator __g_result) -> optional<_ForwardIterator> {
88 if constexpr (__has_random_access_iterator_category_or_concept<_ForwardIterator>::value)
89 return std::__copy(__policy, std::move(__g_first), std::move(__g_first + __g_n), std::move(__g_result));
90 else
91 return std::copy_n(__g_first, __g_n, __g_result);
92 },
93 std::move(__first),
94 std::move(__n),
95 std::move(__result));
96 }
97
98 template <class _ExecutionPolicy,
99 class _ForwardIterator,
100 class _ForwardOutIterator,
101 class _Size,
102 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
103 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
104 _LIBCPP_HIDE_FROM_ABI _ForwardOutIterator
copy_n(_ExecutionPolicy && __policy,_ForwardIterator __first,_Size __n,_ForwardOutIterator __result)105 copy_n(_ExecutionPolicy&& __policy, _ForwardIterator __first, _Size __n, _ForwardOutIterator __result) {
106 auto __res = std::__copy_n(__policy, std::move(__first), std::move(__n), std::move(__result));
107 if (!__res)
108 std::__throw_bad_alloc();
109 return *std::move(__res);
110 }
111
112 _LIBCPP_END_NAMESPACE_STD
113
114 #endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
115
116 #endif // _LIBCPP___ALGORITHM_PSTL_COPY_H
117