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_FILL_H
10#define _LIBCPP___ALGORITHM_FILL_H
11
12#include <__algorithm/fill_n.h>
13#include <__algorithm/for_each_segment.h>
14#include <__config>
15#include <__iterator/iterator_traits.h>
16#include <__iterator/segmented_iterator.h>
17#include <__type_traits/enable_if.h>
18#include <__type_traits/is_same.h>
19
20#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
21# pragma GCC system_header
22#endif
23
24_LIBCPP_BEGIN_NAMESPACE_STD
25
26// fill isn't specialized for std::memset, because the compiler already optimizes the loop to a call to std::memset.
27
28template <class _ForwardIterator, class _Sentinel, class _Tp>
29inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
30__fill(_ForwardIterator __first, _Sentinel __last, const _Tp& __value) {
31#ifndef _LIBCPP_CXX03_LANG
32 if constexpr (is_same<_ForwardIterator, _Sentinel>::value && __is_segmented_iterator_v<_ForwardIterator>) {
33 using __local_iterator_t = typename __segmented_iterator_traits<_ForwardIterator>::__local_iterator;
34 std::__for_each_segment(__first, __last, [&](__local_iterator_t __lfirst, __local_iterator_t __llast) {
35 std::__fill(__lfirst, __llast, __value);
36 });
37 return __last;
38 }
39#endif
40 for (; __first != __last; ++__first)
41 *__first = __value;
42 return __first;
43}
44
45template <class _RandomAccessIterator,
46 class _Tp,
47 __enable_if_t<__has_random_access_iterator_category<_RandomAccessIterator>::value &&
48 !__is_segmented_iterator_v<_RandomAccessIterator>,
49 int> = 0>
50inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _RandomAccessIterator
51__fill(_RandomAccessIterator __first, _RandomAccessIterator __last, const _Tp& __value) {
52 return std::__fill_n(__first, __last - __first, __value);
53}
54
55template <class _ForwardIterator, class _Tp>
56inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
57fill(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value) {
58 std::__fill(__first, __last, __value);
59}
60
61_LIBCPP_END_NAMESPACE_STD
62
63#endif // _LIBCPP___ALGORITHM_FILL_H
64