108 lines
3.6 KiB
C++
108 lines
3.6 KiB
C++
/***************************************************************************
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*
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* _heap.cc - Non-inline definitions for the C++ Standard Library
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* Heap operations
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*
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* $Id: _heap.cc 550991 2007-06-26 23:58:07Z sebor $
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*
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***************************************************************************
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*
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* Copyright (c) 1994
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* Hewlett-Packard Company
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Hewlett-Packard Company makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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***************************************************************************
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*
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* Copyright 1994-2006 Rogue Wave Software.
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*
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**************************************************************************/
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_RWSTD_NAMESPACE (std) {
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_EXPORT
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template <class _RandomAccessIter, class _Dist, class _TypeT, class _Compare>
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void __push_heap (_RandomAccessIter __first, _Dist __holeIndex,
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_Dist __topIndex, _TypeT __val, _Compare __comp)
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{
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for (_Dist __parent = (__holeIndex - 1) / 2;
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__holeIndex > __topIndex
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&& !(__comp (*(__first + __parent), __val) == false);
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__parent = ((__holeIndex = __parent) - 1) / 2) {
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*(__first + __holeIndex) = *(__first + __parent);
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}
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*(__first + __holeIndex) = __val;
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}
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_EXPORT
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template <class _RandomAccessIter, class _Dist, class _TypeT, class _Compare>
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void __adjust_heap (_RandomAccessIter __first, _Dist __holeIndex,
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_Dist __dist, _TypeT __val, _Compare __comp)
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{
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const _Dist __topIndex = __holeIndex;
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_Dist __2ndChild;
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while ((__2ndChild = 2 * __holeIndex + 2) < __dist) {
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if (__comp (*(__first + __2ndChild), *(__first + (__2ndChild - 1))))
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--__2ndChild;
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*(__first + __holeIndex) = *(__first + __2ndChild);
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__holeIndex = __2ndChild;
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}
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if (__2ndChild == __dist) {
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*(__first + __holeIndex) = *(__first + (__2ndChild - 1));
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__holeIndex = __2ndChild - 1;
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}
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__push_heap (__first, __holeIndex, __topIndex, __val, __comp);
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}
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_EXPORT
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template <class _RandomAccessIter, class _Compare, class _Dist>
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void __make_heap (_RandomAccessIter __first, _RandomAccessIter __last,
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_Compare __comp, _Dist*)
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{
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_RWSTD_ASSERT_RANGE (__first, __last);
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const _Dist __dist = __last - __first;
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for (_Dist __parent = (__dist - 2) / 2; ; --__parent) {
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__adjust_heap (__first, __parent, __dist, *(__first + __parent),
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__comp);
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if (__parent == 0)
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return;
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}
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}
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} // namespace std
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