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authorQt by Nokia <qt-info@nokia.com>2011-04-27 12:05:43 +0200
committeraxis <qt-info@nokia.com>2011-04-27 12:05:43 +0200
commit38be0d13830efd2d98281c645c3a60afe05ffece (patch)
tree6ea73f3ec77f7d153333779883e8120f82820abe /tests/auto/qalgorithms/q3tl.h
Initial import from the monolithic Qt.
This is the beginning of revision history for this module. If you want to look at revision history older than this, please refer to the Qt Git wiki for how to use Git history grafting. At the time of writing, this wiki is located here: http://qt.gitorious.org/qt/pages/GitIntroductionWithQt If you have already performed the grafting and you don't see any history beyond this commit, try running "git log" with the "--follow" argument. Branched from the monolithic repo, Qt master branch, at commit 896db169ea224deb96c59ce8af800d019de63f12
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** 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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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