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_GENERATE_H
10 #define _LIBCPP___ALGORITHM_PSTL_GENERATE_H
11
12 #include <__algorithm/pstl_backend.h>
13 #include <__algorithm/pstl_for_each.h>
14 #include <__algorithm/pstl_frontend_dispatch.h>
15 #include <__config>
16 #include <__iterator/cpp17_iterator_concepts.h>
17 #include <__iterator/iterator_traits.h>
18 #include <__type_traits/enable_if.h>
19 #include <__type_traits/is_execution_policy.h>
20 #include <__type_traits/remove_cvref.h>
21 #include <__utility/move.h>
22 #include <optional>
23
24 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
25 # pragma GCC system_header
26 #endif
27
28 _LIBCPP_PUSH_MACROS
29 #include <__undef_macros>
30
31 #if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
32
33 _LIBCPP_BEGIN_NAMESPACE_STD
34
35 template <class>
36 void __pstl_generate();
37
38 template <class _ExecutionPolicy,
39 class _ForwardIterator,
40 class _Generator,
41 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
42 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
43 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<__empty>
__generate(_ExecutionPolicy && __policy,_ForwardIterator && __first,_ForwardIterator && __last,_Generator && __gen)44 __generate(_ExecutionPolicy&& __policy, _ForwardIterator&& __first, _ForwardIterator&& __last, _Generator&& __gen) {
45 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator);
46 return std::__pstl_frontend_dispatch(
47 _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_generate, _RawPolicy),
48 [&__policy](_ForwardIterator __g_first, _ForwardIterator __g_last, _Generator __g_gen) {
49 return std::__for_each(
50 __policy, std::move(__g_first), std::move(__g_last), [&](__iter_reference<_ForwardIterator> __element) {
51 __element = __g_gen();
52 });
53 },
54 std::move(__first),
55 std::move(__last),
56 std::move(__gen));
57 }
58
59 template <class _ExecutionPolicy,
60 class _ForwardIterator,
61 class _Generator,
62 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
63 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
64 _LIBCPP_HIDE_FROM_ABI void
generate(_ExecutionPolicy && __policy,_ForwardIterator __first,_ForwardIterator __last,_Generator __gen)65 generate(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, _Generator __gen) {
66 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator);
67 if (!std::__generate(__policy, std::move(__first), std::move(__last), std::move(__gen)))
68 std::__throw_bad_alloc();
69 }
70
71 template <class>
72 void __pstl_generate_n();
73
74 template <class _ExecutionPolicy,
75 class _ForwardIterator,
76 class _Size,
77 class _Generator,
78 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
79 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
80 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<__empty>
__generate_n(_ExecutionPolicy && __policy,_ForwardIterator && __first,_Size && __n,_Generator && __gen)81 __generate_n(_ExecutionPolicy&& __policy, _ForwardIterator&& __first, _Size&& __n, _Generator&& __gen) {
82 return std::__pstl_frontend_dispatch(
83 _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_generate_n, _RawPolicy),
84 [&__policy](_ForwardIterator __g_first, _Size __g_n, _Generator __g_gen) {
85 return std::__for_each_n(
86 __policy, std::move(__g_first), std::move(__g_n), [&](__iter_reference<_ForwardIterator> __element) {
87 __element = __g_gen();
88 });
89 },
90 std::move(__first),
91 __n,
92 std::move(__gen));
93 }
94
95 template <class _ExecutionPolicy,
96 class _ForwardIterator,
97 class _Size,
98 class _Generator,
99 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
100 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
101 _LIBCPP_HIDE_FROM_ABI void
generate_n(_ExecutionPolicy && __policy,_ForwardIterator __first,_Size __n,_Generator __gen)102 generate_n(_ExecutionPolicy&& __policy, _ForwardIterator __first, _Size __n, _Generator __gen) {
103 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator);
104 if (!std::__generate_n(__policy, std::move(__first), std::move(__n), std::move(__gen)))
105 std::__throw_bad_alloc();
106 }
107
108 _LIBCPP_END_NAMESPACE_STD
109
110 #endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
111
112 _LIBCPP_POP_MACROS
113
114 #endif // _LIBCPP___ALGORITHM_PSTL_GENERATE_H
115