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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___ALGORITHM_FOR_EACH_N_H
#define _LIBCPP___ALGORITHM_FOR_EACH_N_H
#include <__algorithm/for_each.h>
#include <__algorithm/for_each_n_segment.h>
#include <__config>
#include <__functional/identity.h>
#include <__iterator/iterator_traits.h>
#include <__iterator/segmented_iterator.h>
#include <__type_traits/disjunction.h>
#include <__type_traits/enable_if.h>
#include <__type_traits/invoke.h>
#include <__type_traits/negation.h>
#include <__utility/convert_to_integral.h>
#include <__utility/move.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _InputIterator,
class _Size,
class _Func,
class _Proj,
__enable_if_t<!__has_random_access_iterator_category<_InputIterator>::value &&
_Or< _Not<__is_segmented_iterator<_InputIterator> >,
_Not<__has_random_access_local_iterator<_InputIterator> > >::value,
int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _InputIterator
__for_each_n(_InputIterator __first, _Size __orig_n, _Func& __f, _Proj& __proj) {
typedef decltype(std::__convert_to_integral(__orig_n)) _IntegralSize;
_IntegralSize __n = __orig_n;
while (__n > 0) {
std::__invoke(__f, std::__invoke(__proj, *__first));
++__first;
--__n;
}
return std::move(__first);
}
template <class _RandIter,
class _Size,
class _Func,
class _Proj,
__enable_if_t<__has_random_access_iterator_category<_RandIter>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _RandIter
__for_each_n(_RandIter __first, _Size __orig_n, _Func& __f, _Proj& __proj) {
typename std::iterator_traits<_RandIter>::difference_type __n = __orig_n;
auto __last = __first + __n;
std::__for_each(__first, __last, __f, __proj);
return __last;
}
#ifndef _LIBCPP_CXX03_LANG
template <class _SegmentedIterator,
class _Size,
class _Func,
class _Proj,
__enable_if_t<!__has_random_access_iterator_category<_SegmentedIterator>::value &&
__is_segmented_iterator<_SegmentedIterator>::value &&
__has_random_access_iterator_category<
typename __segmented_iterator_traits<_SegmentedIterator>::__local_iterator>::value,
int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _SegmentedIterator
__for_each_n(_SegmentedIterator __first, _Size __orig_n, _Func& __f, _Proj& __proj) {
using __local_iterator_t = typename __segmented_iterator_traits<_SegmentedIterator>::__local_iterator;
return std::__for_each_n_segment(__first, __orig_n, [&](__local_iterator_t __lfirst, __local_iterator_t __llast) {
std::__for_each(__lfirst, __llast, __f, __proj);
});
}
#endif // !_LIBCPP_CXX03_LANG
#if _LIBCPP_STD_VER >= 17
template <class _InputIterator, class _Size, class _Func>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _InputIterator
for_each_n(_InputIterator __first, _Size __orig_n, _Func __f) {
__identity __proj;
return std::__for_each_n(__first, __orig_n, __f, __proj);
}
#endif // _LIBCPP_STD_VER >= 17
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // _LIBCPP___ALGORITHM_FOR_EACH_N_H
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