309 lines
11 KiB
C
309 lines
11 KiB
C
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// Heap implementation -*- C++ -*-
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// Copyright (C) 2001 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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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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* Copyright (c) 1997
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* Silicon Graphics Computer Systems, Inc.
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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. Silicon Graphics 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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/** @file stl_heap.h
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* This is an internal header file, included by other library headers.
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* You should not attempt to use it directly.
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*/
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#ifndef _CPP_BITS_STL_HEAP_H
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#define _CPP_BITS_STL_HEAP_H 1
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namespace std
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{
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// Heap-manipulation functions: push_heap, pop_heap, make_heap, sort_heap.
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template<typename _RandomAccessIterator, typename _Distance, typename _Tp>
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void
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__push_heap(_RandomAccessIterator __first,
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_Distance __holeIndex, _Distance __topIndex, _Tp __value)
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{
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_Distance __parent = (__holeIndex - 1) / 2;
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while (__holeIndex > __topIndex && *(__first + __parent) < __value) {
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*(__first + __holeIndex) = *(__first + __parent);
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__holeIndex = __parent;
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__parent = (__holeIndex - 1) / 2;
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}
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*(__first + __holeIndex) = __value;
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}
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template<typename _RandomAccessIterator>
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inline void
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push_heap(_RandomAccessIterator __first, _RandomAccessIterator __last)
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{
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typedef typename iterator_traits<_RandomAccessIterator>::value_type
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_ValueType;
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typedef typename iterator_traits<_RandomAccessIterator>::difference_type
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_DistanceType;
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// concept requirements
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__glibcpp_function_requires(_Mutable_RandomAccessIteratorConcept<
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_RandomAccessIterator>)
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__glibcpp_function_requires(_LessThanComparableConcept<_ValueType>)
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__push_heap(__first, _DistanceType((__last - __first) - 1), _DistanceType(0),
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_ValueType(*(__last - 1)));
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}
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template<typename _RandomAccessIterator, typename _Distance, typename _Tp,
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typename _Compare>
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void
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__push_heap(_RandomAccessIterator __first, _Distance __holeIndex,
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_Distance __topIndex, _Tp __value, _Compare __comp)
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{
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_Distance __parent = (__holeIndex - 1) / 2;
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while (__holeIndex > __topIndex && __comp(*(__first + __parent), __value)) {
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*(__first + __holeIndex) = *(__first + __parent);
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__holeIndex = __parent;
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__parent = (__holeIndex - 1) / 2;
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}
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*(__first + __holeIndex) = __value;
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}
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template<typename _RandomAccessIterator, typename _Compare>
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inline void
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push_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
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_Compare __comp)
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{
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typedef typename iterator_traits<_RandomAccessIterator>::value_type
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_ValueType;
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typedef typename iterator_traits<_RandomAccessIterator>::difference_type
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_DistanceType;
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// concept requirements
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__glibcpp_function_requires(_Mutable_RandomAccessIteratorConcept<
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_RandomAccessIterator>)
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__push_heap(__first, _DistanceType((__last - __first) - 1), _DistanceType(0),
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_ValueType(*(__last - 1)), __comp);
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}
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template<typename _RandomAccessIterator, typename _Distance, typename _Tp>
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void
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__adjust_heap(_RandomAccessIterator __first, _Distance __holeIndex,
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_Distance __len, _Tp __value)
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{
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_Distance __topIndex = __holeIndex;
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_Distance __secondChild = 2 * __holeIndex + 2;
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while (__secondChild < __len) {
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if (*(__first + __secondChild) < *(__first + (__secondChild - 1)))
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__secondChild--;
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*(__first + __holeIndex) = *(__first + __secondChild);
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__holeIndex = __secondChild;
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__secondChild = 2 * (__secondChild + 1);
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}
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if (__secondChild == __len) {
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*(__first + __holeIndex) = *(__first + (__secondChild - 1));
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__holeIndex = __secondChild - 1;
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}
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__push_heap(__first, __holeIndex, __topIndex, __value);
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}
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template<typename _RandomAccessIterator, typename _Tp>
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inline void
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__pop_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
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_RandomAccessIterator __result, _Tp __value)
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{
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typedef typename iterator_traits<_RandomAccessIterator>::difference_type _Distance;
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*__result = *__first;
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__adjust_heap(__first, _Distance(0), _Distance(__last - __first), __value);
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}
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template<typename _RandomAccessIterator>
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inline void
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pop_heap(_RandomAccessIterator __first, _RandomAccessIterator __last)
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{
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typedef typename iterator_traits<_RandomAccessIterator>::value_type _ValueType;
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// concept requirements
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__glibcpp_function_requires(_Mutable_RandomAccessIteratorConcept<
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_RandomAccessIterator>)
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__glibcpp_function_requires(_LessThanComparableConcept<_ValueType>)
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__pop_heap(__first, __last - 1, __last - 1, _ValueType(*(__last - 1)));
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}
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template<typename _RandomAccessIterator, typename _Distance,
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typename _Tp, typename _Compare>
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void
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__adjust_heap(_RandomAccessIterator __first, _Distance __holeIndex,
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_Distance __len, _Tp __value, _Compare __comp)
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{
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_Distance __topIndex = __holeIndex;
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_Distance __secondChild = 2 * __holeIndex + 2;
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while (__secondChild < __len) {
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if (__comp(*(__first + __secondChild), *(__first + (__secondChild - 1))))
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__secondChild--;
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*(__first + __holeIndex) = *(__first + __secondChild);
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__holeIndex = __secondChild;
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__secondChild = 2 * (__secondChild + 1);
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}
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if (__secondChild == __len) {
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*(__first + __holeIndex) = *(__first + (__secondChild - 1));
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__holeIndex = __secondChild - 1;
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}
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__push_heap(__first, __holeIndex, __topIndex, __value, __comp);
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}
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template<typename _RandomAccessIterator, typename _Tp, typename _Compare>
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inline void
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__pop_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
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_RandomAccessIterator __result, _Tp __value, _Compare __comp)
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{
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typedef typename iterator_traits<_RandomAccessIterator>::difference_type _Distance;
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*__result = *__first;
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__adjust_heap(__first, _Distance(0), _Distance(__last - __first),
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__value, __comp);
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}
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template<typename _RandomAccessIterator, typename _Compare>
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inline void
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pop_heap(_RandomAccessIterator __first,
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_RandomAccessIterator __last, _Compare __comp)
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{
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// concept requirements
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__glibcpp_function_requires(_Mutable_RandomAccessIteratorConcept<
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_RandomAccessIterator>)
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typedef typename iterator_traits<_RandomAccessIterator>::value_type _ValueType;
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__pop_heap(__first, __last - 1, __last - 1, _ValueType(*(__last - 1)), __comp);
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}
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template<typename _RandomAccessIterator>
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void
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make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last)
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{
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typedef typename iterator_traits<_RandomAccessIterator>::value_type
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_ValueType;
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typedef typename iterator_traits<_RandomAccessIterator>::difference_type
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_DistanceType;
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// concept requirements
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__glibcpp_function_requires(_Mutable_RandomAccessIteratorConcept<
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_RandomAccessIterator>)
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__glibcpp_function_requires(_LessThanComparableConcept<_ValueType>)
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if (__last - __first < 2) return;
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_DistanceType __len = __last - __first;
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_DistanceType __parent = (__len - 2)/2;
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while (true) {
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__adjust_heap(__first, __parent, __len, _ValueType(*(__first + __parent)));
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if (__parent == 0) return;
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__parent--;
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}
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}
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template<typename _RandomAccessIterator, typename _Compare>
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inline void
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make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
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_Compare __comp)
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{
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typedef typename iterator_traits<_RandomAccessIterator>::value_type
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_ValueType;
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typedef typename iterator_traits<_RandomAccessIterator>::difference_type
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_DistanceType;
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// concept requirements
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__glibcpp_function_requires(_Mutable_RandomAccessIteratorConcept<
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_RandomAccessIterator>)
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if (__last - __first < 2) return;
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_DistanceType __len = __last - __first;
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_DistanceType __parent = (__len - 2)/2;
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while (true) {
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__adjust_heap(__first, __parent, __len,
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_ValueType(*(__first + __parent)), __comp);
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if (__parent == 0) return;
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__parent--;
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}
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}
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template<typename _RandomAccessIterator>
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void
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sort_heap(_RandomAccessIterator __first, _RandomAccessIterator __last)
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{
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// concept requirements
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__glibcpp_function_requires(_Mutable_RandomAccessIteratorConcept<
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_RandomAccessIterator>)
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__glibcpp_function_requires(_LessThanComparableConcept<
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typename iterator_traits<_RandomAccessIterator>::value_type>)
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while (__last - __first > 1)
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pop_heap(__first, __last--);
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}
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template<typename _RandomAccessIterator, typename _Compare>
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void
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sort_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
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_Compare __comp)
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{
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// concept requirements
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__glibcpp_function_requires(_Mutable_RandomAccessIteratorConcept<
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_RandomAccessIterator>)
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while (__last - __first > 1)
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pop_heap(__first, __last--, __comp);
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}
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} // namespace std
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#endif /* _CPP_BITS_STL_HEAP_H */
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// Local Variables:
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// mode:C++
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// End:
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