71 lines
2.3 KiB
C++
71 lines
2.3 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_PUSH_HEAP_H
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#define _LIBCPP___ALGORITHM_PUSH_HEAP_H
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#include <__algorithm/comp.h>
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#include <__algorithm/comp_ref_type.h>
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#include <__config>
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#include <__iterator/iterator_traits.h>
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#include <__utility/move.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 _Compare, class _RandomAccessIterator>
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_LIBCPP_CONSTEXPR_AFTER_CXX11 void
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__sift_up(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp,
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typename iterator_traits<_RandomAccessIterator>::difference_type __len)
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{
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typedef typename iterator_traits<_RandomAccessIterator>::value_type value_type;
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if (__len > 1)
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{
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__len = (__len - 2) / 2;
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_RandomAccessIterator __ptr = __first + __len;
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if (__comp(*__ptr, *--__last))
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{
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value_type __t(_VSTD::move(*__last));
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do
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{
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*__last = _VSTD::move(*__ptr);
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__last = __ptr;
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if (__len == 0)
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break;
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__len = (__len - 1) / 2;
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__ptr = __first + __len;
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} while (__comp(*__ptr, __t));
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*__last = _VSTD::move(__t);
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}
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}
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}
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template <class _RandomAccessIterator, class _Compare>
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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void
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push_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp)
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{
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typedef typename __comp_ref_type<_Compare>::type _Comp_ref;
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_VSTD::__sift_up<_Comp_ref>(__first, __last, __comp, __last - __first);
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}
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template <class _RandomAccessIterator>
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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void
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push_heap(_RandomAccessIterator __first, _RandomAccessIterator __last)
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{
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_VSTD::push_heap(__first, __last, __less<typename iterator_traits<_RandomAccessIterator>::value_type>());
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ALGORITHM_PUSH_HEAP_H
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