309 lines
11 KiB
C++
309 lines
11 KiB
C++
// Heap implementation -*- C++ -*-
|
|
|
|
// Copyright (C) 2001 Free Software Foundation, Inc.
|
|
//
|
|
// This file is part of the GNU ISO C++ Library. This library is free
|
|
// software; you can redistribute it and/or modify it under the
|
|
// terms of the GNU General Public License as published by the
|
|
// Free Software Foundation; either version 2, or (at your option)
|
|
// any later version.
|
|
|
|
// This library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
|
|
// You should have received a copy of the GNU General Public License along
|
|
// with this library; see the file COPYING. If not, write to the Free
|
|
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
|
|
// USA.
|
|
|
|
// As a special exception, you may use this file as part of a free software
|
|
// library without restriction. Specifically, if other files instantiate
|
|
// templates or use macros or inline functions from this file, or you compile
|
|
// this file and link it with other files to produce an executable, this
|
|
// file does not by itself cause the resulting executable to be covered by
|
|
// the GNU General Public License. This exception does not however
|
|
// invalidate any other reasons why the executable file might be covered by
|
|
// the GNU General Public License.
|
|
|
|
/*
|
|
*
|
|
* Copyright (c) 1994
|
|
* Hewlett-Packard Company
|
|
*
|
|
* Permission to use, copy, modify, distribute and sell this software
|
|
* and its documentation for any purpose is hereby granted without fee,
|
|
* provided that the above copyright notice appear in all copies and
|
|
* that both that copyright notice and this permission notice appear
|
|
* in supporting documentation. Hewlett-Packard Company makes no
|
|
* representations about the suitability of this software for any
|
|
* purpose. It is provided "as is" without express or implied warranty.
|
|
*
|
|
* Copyright (c) 1997
|
|
* Silicon Graphics Computer Systems, Inc.
|
|
*
|
|
* Permission to use, copy, modify, distribute and sell this software
|
|
* and its documentation for any purpose is hereby granted without fee,
|
|
* provided that the above copyright notice appear in all copies and
|
|
* that both that copyright notice and this permission notice appear
|
|
* in supporting documentation. Silicon Graphics makes no
|
|
* representations about the suitability of this software for any
|
|
* purpose. It is provided "as is" without express or implied warranty.
|
|
*/
|
|
|
|
/** @file stl_heap.h
|
|
* This is an internal header file, included by other library headers.
|
|
* You should not attempt to use it directly.
|
|
*/
|
|
|
|
#ifndef _CPP_BITS_STL_HEAP_H
|
|
#define _CPP_BITS_STL_HEAP_H 1
|
|
|
|
namespace std
|
|
{
|
|
|
|
// Heap-manipulation functions: push_heap, pop_heap, make_heap, sort_heap.
|
|
|
|
template<typename _RandomAccessIterator, typename _Distance, typename _Tp>
|
|
void
|
|
__push_heap(_RandomAccessIterator __first,
|
|
_Distance __holeIndex, _Distance __topIndex, _Tp __value)
|
|
{
|
|
_Distance __parent = (__holeIndex - 1) / 2;
|
|
while (__holeIndex > __topIndex && *(__first + __parent) < __value) {
|
|
*(__first + __holeIndex) = *(__first + __parent);
|
|
__holeIndex = __parent;
|
|
__parent = (__holeIndex - 1) / 2;
|
|
}
|
|
*(__first + __holeIndex) = __value;
|
|
}
|
|
|
|
template<typename _RandomAccessIterator>
|
|
inline void
|
|
push_heap(_RandomAccessIterator __first, _RandomAccessIterator __last)
|
|
{
|
|
typedef typename iterator_traits<_RandomAccessIterator>::value_type
|
|
_ValueType;
|
|
typedef typename iterator_traits<_RandomAccessIterator>::difference_type
|
|
_DistanceType;
|
|
|
|
// concept requirements
|
|
__glibcpp_function_requires(_Mutable_RandomAccessIteratorConcept<
|
|
_RandomAccessIterator>)
|
|
__glibcpp_function_requires(_LessThanComparableConcept<_ValueType>)
|
|
|
|
__push_heap(__first, _DistanceType((__last - __first) - 1), _DistanceType(0),
|
|
_ValueType(*(__last - 1)));
|
|
}
|
|
|
|
template<typename _RandomAccessIterator, typename _Distance, typename _Tp,
|
|
typename _Compare>
|
|
void
|
|
__push_heap(_RandomAccessIterator __first, _Distance __holeIndex,
|
|
_Distance __topIndex, _Tp __value, _Compare __comp)
|
|
{
|
|
_Distance __parent = (__holeIndex - 1) / 2;
|
|
while (__holeIndex > __topIndex && __comp(*(__first + __parent), __value)) {
|
|
*(__first + __holeIndex) = *(__first + __parent);
|
|
__holeIndex = __parent;
|
|
__parent = (__holeIndex - 1) / 2;
|
|
}
|
|
*(__first + __holeIndex) = __value;
|
|
}
|
|
|
|
template<typename _RandomAccessIterator, typename _Compare>
|
|
inline void
|
|
push_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
|
|
_Compare __comp)
|
|
{
|
|
typedef typename iterator_traits<_RandomAccessIterator>::value_type
|
|
_ValueType;
|
|
typedef typename iterator_traits<_RandomAccessIterator>::difference_type
|
|
_DistanceType;
|
|
|
|
// concept requirements
|
|
__glibcpp_function_requires(_Mutable_RandomAccessIteratorConcept<
|
|
_RandomAccessIterator>)
|
|
|
|
__push_heap(__first, _DistanceType((__last - __first) - 1), _DistanceType(0),
|
|
_ValueType(*(__last - 1)), __comp);
|
|
}
|
|
|
|
template<typename _RandomAccessIterator, typename _Distance, typename _Tp>
|
|
void
|
|
__adjust_heap(_RandomAccessIterator __first, _Distance __holeIndex,
|
|
_Distance __len, _Tp __value)
|
|
{
|
|
_Distance __topIndex = __holeIndex;
|
|
_Distance __secondChild = 2 * __holeIndex + 2;
|
|
while (__secondChild < __len) {
|
|
if (*(__first + __secondChild) < *(__first + (__secondChild - 1)))
|
|
__secondChild--;
|
|
*(__first + __holeIndex) = *(__first + __secondChild);
|
|
__holeIndex = __secondChild;
|
|
__secondChild = 2 * (__secondChild + 1);
|
|
}
|
|
if (__secondChild == __len) {
|
|
*(__first + __holeIndex) = *(__first + (__secondChild - 1));
|
|
__holeIndex = __secondChild - 1;
|
|
}
|
|
__push_heap(__first, __holeIndex, __topIndex, __value);
|
|
}
|
|
|
|
template<typename _RandomAccessIterator, typename _Tp>
|
|
inline void
|
|
__pop_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
|
|
_RandomAccessIterator __result, _Tp __value)
|
|
{
|
|
typedef typename iterator_traits<_RandomAccessIterator>::difference_type _Distance;
|
|
*__result = *__first;
|
|
__adjust_heap(__first, _Distance(0), _Distance(__last - __first), __value);
|
|
}
|
|
|
|
template<typename _RandomAccessIterator>
|
|
inline void
|
|
pop_heap(_RandomAccessIterator __first, _RandomAccessIterator __last)
|
|
{
|
|
typedef typename iterator_traits<_RandomAccessIterator>::value_type _ValueType;
|
|
|
|
// concept requirements
|
|
__glibcpp_function_requires(_Mutable_RandomAccessIteratorConcept<
|
|
_RandomAccessIterator>)
|
|
__glibcpp_function_requires(_LessThanComparableConcept<_ValueType>)
|
|
|
|
__pop_heap(__first, __last - 1, __last - 1, _ValueType(*(__last - 1)));
|
|
}
|
|
|
|
template<typename _RandomAccessIterator, typename _Distance,
|
|
typename _Tp, typename _Compare>
|
|
void
|
|
__adjust_heap(_RandomAccessIterator __first, _Distance __holeIndex,
|
|
_Distance __len, _Tp __value, _Compare __comp)
|
|
{
|
|
_Distance __topIndex = __holeIndex;
|
|
_Distance __secondChild = 2 * __holeIndex + 2;
|
|
while (__secondChild < __len) {
|
|
if (__comp(*(__first + __secondChild), *(__first + (__secondChild - 1))))
|
|
__secondChild--;
|
|
*(__first + __holeIndex) = *(__first + __secondChild);
|
|
__holeIndex = __secondChild;
|
|
__secondChild = 2 * (__secondChild + 1);
|
|
}
|
|
if (__secondChild == __len) {
|
|
*(__first + __holeIndex) = *(__first + (__secondChild - 1));
|
|
__holeIndex = __secondChild - 1;
|
|
}
|
|
__push_heap(__first, __holeIndex, __topIndex, __value, __comp);
|
|
}
|
|
|
|
template<typename _RandomAccessIterator, typename _Tp, typename _Compare>
|
|
inline void
|
|
__pop_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
|
|
_RandomAccessIterator __result, _Tp __value, _Compare __comp)
|
|
{
|
|
typedef typename iterator_traits<_RandomAccessIterator>::difference_type _Distance;
|
|
*__result = *__first;
|
|
__adjust_heap(__first, _Distance(0), _Distance(__last - __first),
|
|
__value, __comp);
|
|
}
|
|
|
|
template<typename _RandomAccessIterator, typename _Compare>
|
|
inline void
|
|
pop_heap(_RandomAccessIterator __first,
|
|
_RandomAccessIterator __last, _Compare __comp)
|
|
{
|
|
// concept requirements
|
|
__glibcpp_function_requires(_Mutable_RandomAccessIteratorConcept<
|
|
_RandomAccessIterator>)
|
|
|
|
typedef typename iterator_traits<_RandomAccessIterator>::value_type _ValueType;
|
|
__pop_heap(__first, __last - 1, __last - 1, _ValueType(*(__last - 1)), __comp);
|
|
}
|
|
|
|
template<typename _RandomAccessIterator>
|
|
void
|
|
make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last)
|
|
{
|
|
typedef typename iterator_traits<_RandomAccessIterator>::value_type
|
|
_ValueType;
|
|
typedef typename iterator_traits<_RandomAccessIterator>::difference_type
|
|
_DistanceType;
|
|
|
|
// concept requirements
|
|
__glibcpp_function_requires(_Mutable_RandomAccessIteratorConcept<
|
|
_RandomAccessIterator>)
|
|
__glibcpp_function_requires(_LessThanComparableConcept<_ValueType>)
|
|
|
|
if (__last - __first < 2) return;
|
|
_DistanceType __len = __last - __first;
|
|
_DistanceType __parent = (__len - 2)/2;
|
|
|
|
while (true) {
|
|
__adjust_heap(__first, __parent, __len, _ValueType(*(__first + __parent)));
|
|
if (__parent == 0) return;
|
|
__parent--;
|
|
}
|
|
}
|
|
|
|
template<typename _RandomAccessIterator, typename _Compare>
|
|
inline void
|
|
make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
|
|
_Compare __comp)
|
|
{
|
|
typedef typename iterator_traits<_RandomAccessIterator>::value_type
|
|
_ValueType;
|
|
typedef typename iterator_traits<_RandomAccessIterator>::difference_type
|
|
_DistanceType;
|
|
|
|
// concept requirements
|
|
__glibcpp_function_requires(_Mutable_RandomAccessIteratorConcept<
|
|
_RandomAccessIterator>)
|
|
|
|
if (__last - __first < 2) return;
|
|
_DistanceType __len = __last - __first;
|
|
_DistanceType __parent = (__len - 2)/2;
|
|
|
|
while (true) {
|
|
__adjust_heap(__first, __parent, __len,
|
|
_ValueType(*(__first + __parent)), __comp);
|
|
if (__parent == 0) return;
|
|
__parent--;
|
|
}
|
|
}
|
|
|
|
template<typename _RandomAccessIterator>
|
|
void
|
|
sort_heap(_RandomAccessIterator __first, _RandomAccessIterator __last)
|
|
{
|
|
// concept requirements
|
|
__glibcpp_function_requires(_Mutable_RandomAccessIteratorConcept<
|
|
_RandomAccessIterator>)
|
|
__glibcpp_function_requires(_LessThanComparableConcept<
|
|
typename iterator_traits<_RandomAccessIterator>::value_type>)
|
|
|
|
while (__last - __first > 1)
|
|
pop_heap(__first, __last--);
|
|
}
|
|
|
|
template<typename _RandomAccessIterator, typename _Compare>
|
|
void
|
|
sort_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
|
|
_Compare __comp)
|
|
{
|
|
// concept requirements
|
|
__glibcpp_function_requires(_Mutable_RandomAccessIteratorConcept<
|
|
_RandomAccessIterator>)
|
|
|
|
while (__last - __first > 1)
|
|
pop_heap(__first, __last--, __comp);
|
|
}
|
|
|
|
} // namespace std
|
|
|
|
#endif /* _CPP_BITS_STL_HEAP_H */
|
|
|
|
// Local Variables:
|
|
// mode:C++
|
|
// End:
|