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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Qt3Support module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef Q3TL_H
#define Q3TL_H
#include <QtCore/qalgorithms.h>
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
QT_MODULE(Qt3SupportLight)
template <typename T, typename LessThan>
Q_OUTOFLINE_TEMPLATE void qHeapSortPushDown(T *heap, int first, int last, LessThan lessThan)
{
int r = first;
while (r <= last / 2) {
if (last == 2 * r) {
// node r has only one child
if (lessThan(heap[2 * r], heap[r]))
qSwap(heap[r], heap[2 * r]);
r = last;
} else {
// node r has two children
if (lessThan(heap[2 * r], heap[r]) && !lessThan(heap[2 * r + 1], heap[2 * r])) {
// swap with left child
qSwap(heap[r], heap[2 * r]);
r *= 2;
} else if (lessThan(heap[2 * r + 1], heap[r])
&& lessThan(heap[2 * r + 1], heap[2 * r])) {
// swap with right child
qSwap(heap[r], heap[2 * r + 1]);
r = 2 * r + 1;
} else {
r = last;
}
}
}
}
template <typename BiIterator, typename T, typename LessThan>
Q_OUTOFLINE_TEMPLATE void qHeapSortHelper(BiIterator begin, BiIterator end, const T & /* dummy */, LessThan lessThan)
{
BiIterator it = begin;
uint n = 0;
while (it != end) {
++n;
++it;
}
if (n == 0)
return;
// Create the heap
BiIterator insert = begin;
T *realheap = new T[n];
T *heap = realheap - 1;
int size = 0;
for(; insert != end; ++insert) {
heap[++size] = *insert;
int i = size;
while (i > 1 && lessThan(heap[i], heap[i / 2])) {
qSwap(heap[i], heap[i / 2]);
i /= 2;
}
}
// Now do the sorting
for (int i = n; i > 0; i--) {
*begin++ = heap[1];
if (i > 1) {
heap[1] = heap[i];
qHeapSortPushDown(heap, 1, i - 1, lessThan);
}
}
delete[] realheap;
}
template <typename BiIterator, typename T>
inline void qHeapSortHelper(BiIterator begin, BiIterator end, const T &dummy)
{
qHeapSortHelper(begin, end, dummy, qLess<T>());
}
template <typename BiIterator, typename LessThan>
inline void qHeapSort(BiIterator begin, BiIterator end, LessThan lessThan)
{
if (begin != end)
qHeapSortHelper(begin, end, *begin, lessThan);
}
template <typename BiIterator>
inline void qHeapSort(BiIterator begin, BiIterator end)
{
if (begin != end)
qHeapSortHelper(begin, end, *begin);
}
template <typename Container>
inline void qHeapSort(Container &c)
{
#ifdef Q_CC_BOR
// Work around Borland 5.5 optimizer bug
c.detach();
#endif
if (!c.empty())
qHeapSortHelper(c.begin(), c.end(), *c.begin());
}
template <typename BiIterator, typename LessThan>
void qBubbleSort(BiIterator begin, BiIterator end, LessThan lessThan)
{
// Goto last element;
BiIterator last = end;
// empty list
if (begin == end)
return;
--last;
// only one element ?
if (last == begin)
return;
// So we have at least two elements in here
while (begin != last) {
bool swapped = false;
BiIterator swapPos = begin;
BiIterator x = end;
BiIterator y = x;
y--;
do {
--x;
--y;
if (lessThan(*x, *y)) {
swapped = true;
qSwap(*x, *y);
swapPos = y;
}
} while (y != begin);
if (!swapped)
return;
begin = swapPos;
++begin;
}
}
template <typename BiIterator, typename T>
void qBubbleSortHelper(BiIterator begin, BiIterator end, T)
{
qBubbleSort(begin, end, qLess<T>());
}
template <typename BiIterator>
void qBubbleSort(BiIterator begin, BiIterator end)
{
if (begin != end)
qBubbleSortHelper(begin, end, *begin);
}
template <typename Container>
inline void qBubbleSort(Container &c)
{
qBubbleSort(c.begin(), c.end());
}
QT_END_NAMESPACE
QT_END_HEADER
#endif // Q3TL_H
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