82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ALGORITHM_PARTITION_H
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#define _LIBCPP___ALGORITHM_PARTITION_H
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#include <__config>
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#include <__iterator/iterator_traits.h>
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#include <__utility/swap.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _Predicate, class _ForwardIterator>
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_LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator
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__partition(_ForwardIterator __first, _ForwardIterator __last, _Predicate __pred, forward_iterator_tag)
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{
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while (true)
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{
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if (__first == __last)
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return __first;
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if (!__pred(*__first))
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break;
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++__first;
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}
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for (_ForwardIterator __p = __first; ++__p != __last;)
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{
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if (__pred(*__p))
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{
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swap(*__first, *__p);
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++__first;
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}
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}
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return __first;
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}
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template <class _Predicate, class _BidirectionalIterator>
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_LIBCPP_CONSTEXPR_AFTER_CXX17 _BidirectionalIterator
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__partition(_BidirectionalIterator __first, _BidirectionalIterator __last, _Predicate __pred,
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bidirectional_iterator_tag)
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{
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while (true)
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{
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while (true)
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{
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if (__first == __last)
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return __first;
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if (!__pred(*__first))
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break;
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++__first;
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}
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do
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{
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if (__first == --__last)
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return __first;
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} while (!__pred(*__last));
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swap(*__first, *__last);
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++__first;
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}
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}
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template <class _ForwardIterator, class _Predicate>
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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_ForwardIterator
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partition(_ForwardIterator __first, _ForwardIterator __last, _Predicate __pred)
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{
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return _VSTD::__partition<_Predicate&>(
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__first, __last, __pred, typename iterator_traits<_ForwardIterator>::iterator_category());
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ALGORITHM_PARTITION_H
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