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//===----------------------------------------------------------------------===//
//
// 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_PARTITION_H
#define _LIBCPP___ALGORITHM_PARTITION_H
#include <__algorithm/iterator_operations.h>
#include <__config>
#include <__iterator/iterator_traits.h>
#include <__utility/move.h>
#include <__utility/pair.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _Predicate, class _AlgPolicy, class _ForwardIterator, class _Sentinel>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_ForwardIterator, _ForwardIterator>
__partition_impl(_ForwardIterator __first, _Sentinel __last, _Predicate __pred, forward_iterator_tag) {
while (true) {
if (__first == __last)
return std::make_pair(std::move(__first), std::move(__first));
if (!__pred(*__first))
break;
++__first;
}
_ForwardIterator __p = __first;
while (++__p != __last) {
if (__pred(*__p)) {
_IterOps<_AlgPolicy>::iter_swap(__first, __p);
++__first;
}
}
return std::make_pair(std::move(__first), std::move(__p));
}
template <class _Predicate, class _AlgPolicy, class _BidirectionalIterator, class _Sentinel>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_BidirectionalIterator, _BidirectionalIterator>
__partition_impl(_BidirectionalIterator __first, _Sentinel __sentinel, _Predicate __pred, bidirectional_iterator_tag) {
_BidirectionalIterator __original_last = _IterOps<_AlgPolicy>::next(__first, __sentinel);
_BidirectionalIterator __last = __original_last;
while (true) {
while (true) {
if (__first == __last)
return std::make_pair(std::move(__first), std::move(__original_last));
if (!__pred(*__first))
break;
++__first;
}
do {
if (__first == --__last)
return std::make_pair(std::move(__first), std::move(__original_last));
} while (!__pred(*__last));
_IterOps<_AlgPolicy>::iter_swap(__first, __last);
++__first;
}
}
template <class _AlgPolicy, class _ForwardIterator, class _Sentinel, class _Predicate, class _IterCategory>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_ForwardIterator, _ForwardIterator>
__partition(_ForwardIterator __first, _Sentinel __last, _Predicate&& __pred, _IterCategory __iter_category) {
return std::__partition_impl<__remove_cvref_t<_Predicate>&, _AlgPolicy>(
std::move(__first), std::move(__last), __pred, __iter_category);
}
template <class _ForwardIterator, class _Predicate>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
partition(_ForwardIterator __first, _ForwardIterator __last, _Predicate __pred) {
using _IterCategory = typename iterator_traits<_ForwardIterator>::iterator_category;
auto __result = std::__partition<_ClassicAlgPolicy>(std::move(__first), std::move(__last), __pred, _IterCategory());
return __result.first;
}
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___ALGORITHM_PARTITION_H
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