Warning: This file is not a C or C++ file. It does not have highlighting.

1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP___ALGORITHM_FOR_EACH_N_H
11#define _LIBCPP___ALGORITHM_FOR_EACH_N_H
12
13#include <__algorithm/for_each.h>
14#include <__algorithm/for_each_n_segment.h>
15#include <__config>
16#include <__iterator/iterator_traits.h>
17#include <__iterator/segmented_iterator.h>
18#include <__type_traits/disjunction.h>
19#include <__type_traits/enable_if.h>
20#include <__type_traits/negation.h>
21#include <__utility/convert_to_integral.h>
22#include <__utility/move.h>
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_LIBCPP_BEGIN_NAMESPACE_STD
32
33template <class _InputIterator,
34 class _Size,
35 class _Func,
36 __enable_if_t<!__has_random_access_iterator_category<_InputIterator>::value &&
37 _Or< _Not<__is_segmented_iterator<_InputIterator> >,
38 _Not<__has_random_access_local_iterator<_InputIterator> > >::value,
39 int> = 0>
40_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _InputIterator
41__for_each_n(_InputIterator __first, _Size __orig_n, _Func& __f) {
42 typedef decltype(std::__convert_to_integral(__orig_n)) _IntegralSize;
43 _IntegralSize __n = __orig_n;
44 while (__n > 0) {
45 __f(*__first);
46 ++__first;
47 --__n;
48 }
49 return std::move(__first);
50}
51
52template <class _RandIter,
53 class _Size,
54 class _Func,
55 __enable_if_t<__has_random_access_iterator_category<_RandIter>::value, int> = 0>
56_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _RandIter
57__for_each_n(_RandIter __first, _Size __orig_n, _Func& __f) {
58 typename std::iterator_traits<_RandIter>::difference_type __n = __orig_n;
59 auto __last = __first + __n;
60 std::__for_each(__first, __last, __f);
61 return std::move(__last);
62}
63
64#ifndef _LIBCPP_CXX03_LANG
65template <class _SegmentedIterator,
66 class _Size,
67 class _Func,
68 __enable_if_t<!__has_random_access_iterator_category<_SegmentedIterator>::value &&
69 __is_segmented_iterator<_SegmentedIterator>::value &&
70 __has_random_access_iterator_category<
71 typename __segmented_iterator_traits<_SegmentedIterator>::__local_iterator>::value,
72 int> = 0>
73_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _SegmentedIterator
74__for_each_n(_SegmentedIterator __first, _Size __orig_n, _Func& __f) {
75 using __local_iterator_t = typename __segmented_iterator_traits<_SegmentedIterator>::__local_iterator;
76 return std::__for_each_n_segment(__first, __orig_n, [&](__local_iterator_t __lfirst, __local_iterator_t __llast) {
77 std::__for_each(__lfirst, __llast, __f);
78 });
79}
80#endif // !_LIBCPP_CXX03_LANG
81
82#if _LIBCPP_STD_VER >= 17
83
84template <class _InputIterator, class _Size, class _Function>
85inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _InputIterator
86for_each_n(_InputIterator __first, _Size __orig_n, _Function __f) {
87 return std::__for_each_n(__first, __orig_n, __f);
88}
89
90#endif // _LIBCPP_STD_VER >= 17
91
92_LIBCPP_END_NAMESPACE_STD
93
94_LIBCPP_POP_MACROS
95
96#endif // _LIBCPP___ALGORITHM_FOR_EACH_N_H
97

Warning: This file is not a C or C++ file. It does not have highlighting.

source code of libcxx/include/__algorithm/for_each_n.h