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_FILL_H
10 #define _LIBCPP___ALGORITHM_PSTL_FILL_H
11 
12 #include <__algorithm/fill_n.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 <__utility/terminate_on_exception.h>
23 
24 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
25 #  pragma GCC system_header
26 #endif
27 
28 #if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
29 
30 _LIBCPP_BEGIN_NAMESPACE_STD
31 
32 template <class>
33 void __pstl_fill(); // declaration needed for the frontend dispatch below
34 
35 template <class _ExecutionPolicy,
36           class _ForwardIterator,
37           class _Tp,
38           class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
39           enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
40 _LIBCPP_HIDE_FROM_ABI void
41 fill(_ExecutionPolicy&& __policy, _ForwardIterator __first, _ForwardIterator __last, const _Tp& __value) {
42   _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator);
43   std::__pstl_frontend_dispatch(
44       _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_fill),
45       [&](_ForwardIterator __g_first, _ForwardIterator __g_last, const _Tp& __g_value) {
46         std::for_each(__policy, __g_first, __g_last, [&](__iter_reference<_ForwardIterator> __element) {
47           __element = __g_value;
48         });
49       },
50       std::move(__first),
51       std::move(__last),
52       __value);
53 }
54 
55 template <class>
56 void __pstl_fill_n(); // declaration needed for the frontend dispatch below
57 
58 template <class _ExecutionPolicy,
59           class _ForwardIterator,
60           class _SizeT,
61           class _Tp,
62           class _RawPolicy                                    = __remove_cvref_t<_ExecutionPolicy>,
63           enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
64 _LIBCPP_HIDE_FROM_ABI void
65 fill_n(_ExecutionPolicy&& __policy, _ForwardIterator __first, _SizeT __n, const _Tp& __value) {
66   _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator);
67   std::__pstl_frontend_dispatch(
68       _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_fill_n),
69       [&](_ForwardIterator __g_first, _SizeT __g_n, const _Tp& __g_value) {
70         if constexpr (__has_random_access_iterator_category<_ForwardIterator>::value)
71           std::fill(__policy, __g_first, __g_first + __g_n, __g_value);
72         else
73           std::fill_n(__g_first, __g_n, __g_value);
74       },
75       std::move(__first),
76       __n,
77       __value);
78 }
79 
80 _LIBCPP_END_NAMESPACE_STD
81 
82 #endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
83 
84 #endif // _LIBCPP___ALGORITHM_PSTL_FILL_H
85