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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 526 insertions, 0 deletions

diff --git a/src/corelib/tools/qalgorithms.h b/src/corelib/tools/qalgorithms.h
new file mode 100644
index 0000000000..6b870397b6
--- /dev/null
+++ b/src/corelib/tools/qalgorithms.h
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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 QtCore 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 QALGORITHMS_H
+#define QALGORITHMS_H
+
+#include <QtCore/qglobal.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Core)
+
+/*
+    Warning: The contents of QAlgorithmsPrivate is not a part of the public Qt API
+    and may be changed from version to version or even be completely removed.
+*/
+namespace QAlgorithmsPrivate {
+
+template <typename RandomAccessIterator, typename T, typename LessThan>
+Q_OUTOFLINE_TEMPLATE void qSortHelper(RandomAccessIterator start, RandomAccessIterator end, const T &t, LessThan lessThan);
+template <typename RandomAccessIterator, typename T>
+inline void qSortHelper(RandomAccessIterator begin, RandomAccessIterator end, const T &dummy);
+
+template <typename RandomAccessIterator, typename T, typename LessThan>
+Q_OUTOFLINE_TEMPLATE void qStableSortHelper(RandomAccessIterator start, RandomAccessIterator end, const T &t, LessThan lessThan);
+template <typename RandomAccessIterator, typename T>
+inline void qStableSortHelper(RandomAccessIterator, RandomAccessIterator, const T &);
+
+template <typename RandomAccessIterator, typename T, typename LessThan>
+Q_OUTOFLINE_TEMPLATE RandomAccessIterator qLowerBoundHelper(RandomAccessIterator begin, RandomAccessIterator end, const T &value, LessThan lessThan);
+template <typename RandomAccessIterator, typename T, typename LessThan>
+Q_OUTOFLINE_TEMPLATE RandomAccessIterator qUpperBoundHelper(RandomAccessIterator begin, RandomAccessIterator end, const T &value, LessThan lessThan);
+template <typename RandomAccessIterator, typename T, typename LessThan>
+Q_OUTOFLINE_TEMPLATE RandomAccessIterator qBinaryFindHelper(RandomAccessIterator begin, RandomAccessIterator end, const T &value, LessThan lessThan);
+
+}
+
+template <typename InputIterator, typename OutputIterator>
+inline OutputIterator qCopy(InputIterator begin, InputIterator end, OutputIterator dest)
+{
+    while (begin != end)
+        *dest++ = *begin++;
+    return dest;
+}
+
+template <typename BiIterator1, typename BiIterator2>
+inline BiIterator2 qCopyBackward(BiIterator1 begin, BiIterator1 end, BiIterator2 dest)
+{
+    while (begin != end)
+        *--dest = *--end;
+    return dest;
+}
+
+template <typename InputIterator1, typename InputIterator2>
+inline bool qEqual(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2)
+{
+    for (; first1 != last1; ++first1, ++first2)
+        if (!(*first1 == *first2))
+            return false;
+    return true;
+}
+
+template <typename ForwardIterator, typename T>
+inline void qFill(ForwardIterator first, ForwardIterator last, const T &val)
+{
+    for (; first != last; ++first)
+        *first = val;
+}
+
+template <typename Container, typename T>
+inline void qFill(Container &container, const T &val)
+{
+    qFill(container.begin(), container.end(), val);
+}
+
+template <typename InputIterator, typename T>
+inline InputIterator qFind(InputIterator first, InputIterator last, const T &val)
+{
+    while (first != last && !(*first == val))
+        ++first;
+    return first;
+}
+
+template <typename Container, typename T>
+inline typename Container::const_iterator qFind(const Container &container, const T &val)
+{
+    return qFind(container.constBegin(), container.constEnd(), val);
+}
+
+template <typename InputIterator, typename T, typename Size>
+inline void qCount(InputIterator first, InputIterator last, const T &value, Size &n)
+{
+    for (; first != last; ++first)
+        if (*first == value)
+            ++n;
+}
+
+template <typename Container, typename T, typename Size>
+inline void qCount(const Container &container, const T &value, Size &n)
+{
+    qCount(container.constBegin(), container.constEnd(), value, n);
+}
+
+#ifdef qdoc
+template <typename T>
+LessThan qLess()
+{
+}
+
+template <typename T>
+LessThan qGreater()
+{
+}
+#else
+template <typename T>
+class qLess
+{
+public:
+    inline bool operator()(const T &t1, const T &t2) const
+    {
+        return (t1 < t2);
+    }
+};
+
+template <typename T>
+class qGreater
+{
+public:
+    inline bool operator()(const T &t1, const T &t2) const
+    {
+        return (t2 < t1);
+    }
+};
+#endif
+
+template <typename RandomAccessIterator>
+inline void qSort(RandomAccessIterator start, RandomAccessIterator end)
+{
+    if (start != end)
+        QAlgorithmsPrivate::qSortHelper(start, end, *start);
+}
+
+template <typename RandomAccessIterator, typename LessThan>
+inline void qSort(RandomAccessIterator start, RandomAccessIterator end, LessThan lessThan)
+{
+    if (start != end)
+        QAlgorithmsPrivate::qSortHelper(start, end, *start, lessThan);
+}
+
+template<typename Container>
+inline void qSort(Container &c)
+{
+#ifdef Q_CC_BOR
+    // Work around Borland 5.5 optimizer bug
+    c.detach();
+#endif
+    if (!c.empty())
+        QAlgorithmsPrivate::qSortHelper(c.begin(), c.end(), *c.begin());
+}
+
+template <typename RandomAccessIterator>
+inline void qStableSort(RandomAccessIterator start, RandomAccessIterator end)
+{
+    if (start != end)
+        QAlgorithmsPrivate::qStableSortHelper(start, end, *start);
+}
+
+template <typename RandomAccessIterator, typename LessThan>
+inline void qStableSort(RandomAccessIterator start, RandomAccessIterator end, LessThan lessThan)
+{
+    if (start != end)
+        QAlgorithmsPrivate::qStableSortHelper(start, end, *start, lessThan);
+}
+
+template<typename Container>
+inline void qStableSort(Container &c)
+{
+#ifdef Q_CC_BOR
+    // Work around Borland 5.5 optimizer bug
+    c.detach();
+#endif
+    if (!c.empty())
+        QAlgorithmsPrivate::qStableSortHelper(c.begin(), c.end(), *c.begin());
+}
+
+template <typename RandomAccessIterator, typename T>
+Q_OUTOFLINE_TEMPLATE RandomAccessIterator qLowerBound(RandomAccessIterator begin, RandomAccessIterator end, const T &value)
+{
+    // Implementation is duplicated from QAlgorithmsPrivate to keep existing code
+    // compiling. We have to allow using *begin and value with different types,
+    // and then implementing operator< for those types.
+    RandomAccessIterator middle;
+    int n = end - begin;
+    int half;
+
+    while (n > 0) {
+        half = n >> 1;
+        middle = begin + half;
+        if (*middle < value) {
+            begin = middle + 1;
+            n -= half + 1;
+        } else {
+            n = half;
+        }
+    }
+    return begin;
+}
+
+template <typename RandomAccessIterator, typename T, typename LessThan>
+Q_OUTOFLINE_TEMPLATE RandomAccessIterator qLowerBound(RandomAccessIterator begin, RandomAccessIterator end, const T &value, LessThan lessThan)
+{
+    return QAlgorithmsPrivate::qLowerBoundHelper(begin, end, value, lessThan);
+}
+
+template <typename Container, typename T>
+Q_OUTOFLINE_TEMPLATE typename Container::const_iterator qLowerBound(const Container &container, const T &value)
+{
+    return QAlgorithmsPrivate::qLowerBoundHelper(container.constBegin(), container.constEnd(), value, qLess<T>());
+}
+
+template <typename RandomAccessIterator, typename T>
+Q_OUTOFLINE_TEMPLATE RandomAccessIterator qUpperBound(RandomAccessIterator begin, RandomAccessIterator end, const T &value)
+{
+    // Implementation is duplicated from QAlgorithmsPrivate.
+    RandomAccessIterator middle;
+    int n = end - begin;
+    int half;
+
+    while (n > 0) {
+        half = n >> 1;
+        middle = begin + half;
+        if (value < *middle) {
+            n = half;
+        } else {
+            begin = middle + 1;
+            n -= half + 1;
+        }
+    }
+    return begin;
+}
+
+template <typename RandomAccessIterator, typename T, typename LessThan>
+Q_OUTOFLINE_TEMPLATE RandomAccessIterator qUpperBound(RandomAccessIterator begin, RandomAccessIterator end, const T &value, LessThan lessThan)
+{
+    return QAlgorithmsPrivate::qUpperBoundHelper(begin, end, value, lessThan);
+}
+
+template <typename Container, typename T>
+Q_OUTOFLINE_TEMPLATE typename Container::const_iterator qUpperBound(const Container &container, const T &value)
+{
+    return QAlgorithmsPrivate::qUpperBoundHelper(container.constBegin(), container.constEnd(), value, qLess<T>());
+}
+
+template <typename RandomAccessIterator, typename T>
+Q_OUTOFLINE_TEMPLATE RandomAccessIterator qBinaryFind(RandomAccessIterator begin, RandomAccessIterator end, const T &value)
+{
+    // Implementation is duplicated from QAlgorithmsPrivate.
+    RandomAccessIterator it = qLowerBound(begin, end, value);
+
+    if (it == end || value < *it)
+        return end;
+
+    return it;
+}
+
+template <typename RandomAccessIterator, typename T, typename LessThan>
+Q_OUTOFLINE_TEMPLATE RandomAccessIterator qBinaryFind(RandomAccessIterator begin, RandomAccessIterator end, const T &value, LessThan lessThan)
+{
+    return QAlgorithmsPrivate::qBinaryFindHelper(begin, end, value, lessThan);
+}
+
+template <typename Container, typename T>
+Q_OUTOFLINE_TEMPLATE typename Container::const_iterator qBinaryFind(const Container &container, const T &value)
+{
+    return QAlgorithmsPrivate::qBinaryFindHelper(container.constBegin(), container.constEnd(), value, qLess<T>());
+}
+
+template <typename ForwardIterator>
+Q_OUTOFLINE_TEMPLATE void qDeleteAll(ForwardIterator begin, ForwardIterator end)
+{
+    while (begin != end) {
+        delete *begin;
+        ++begin;
+    }
+}
+
+template <typename Container>
+inline void qDeleteAll(const Container &c)
+{
+    qDeleteAll(c.begin(), c.end());
+}
+
+/*
+    Warning: The contents of QAlgorithmsPrivate is not a part of the public Qt API
+    and may be changed from version to version or even be completely removed.
+*/
+namespace QAlgorithmsPrivate {
+
+template <typename RandomAccessIterator, typename T, typename LessThan>
+Q_OUTOFLINE_TEMPLATE void qSortHelper(RandomAccessIterator start, RandomAccessIterator end, const T &t, LessThan lessThan)
+{
+top:
+    int span = int(end - start);
+    if (span < 2)
+        return;
+
+    --end;
+    RandomAccessIterator low = start, high = end - 1;
+    RandomAccessIterator pivot = start + span / 2;
+
+    if (lessThan(*end, *start))
+        qSwap(*end, *start);
+    if (span == 2)
+        return;
+
+    if (lessThan(*pivot, *start))
+        qSwap(*pivot, *start);
+    if (lessThan(*end, *pivot))
+        qSwap(*end, *pivot);
+    if (span == 3)
+        return;
+
+    qSwap(*pivot, *end);
+
+    while (low < high) {
+        while (low < high && lessThan(*low, *end))
+            ++low;
+
+        while (high > low && lessThan(*end, *high))
+            --high;
+
+        if (low < high) {
+            qSwap(*low, *high);
+            ++low;
+            --high;
+        } else {
+            break;
+        }
+    }
+
+    if (lessThan(*low, *end))
+        ++low;
+
+    qSwap(*end, *low);
+    qSortHelper(start, low, t, lessThan);
+
+    start = low + 1;
+    ++end;
+    goto top;
+}
+
+template <typename RandomAccessIterator, typename T>
+inline void qSortHelper(RandomAccessIterator begin, RandomAccessIterator end, const T &dummy)
+{
+    qSortHelper(begin, end, dummy, qLess<T>());
+}
+
+template <typename RandomAccessIterator>
+Q_OUTOFLINE_TEMPLATE void qReverse(RandomAccessIterator begin, RandomAccessIterator end)
+{
+    --end;
+    while (begin < end)
+        qSwap(*begin++, *end--);
+}
+
+template <typename RandomAccessIterator>
+Q_OUTOFLINE_TEMPLATE void qRotate(RandomAccessIterator begin, RandomAccessIterator middle, RandomAccessIterator end)
+{
+    qReverse(begin, middle);
+    qReverse(middle, end);
+    qReverse(begin, end);
+}
+
+template <typename RandomAccessIterator, typename T, typename LessThan>
+Q_OUTOFLINE_TEMPLATE void qMerge(RandomAccessIterator begin, RandomAccessIterator pivot, RandomAccessIterator end, T &t, LessThan lessThan)
+{
+    const int len1 = pivot - begin;
+    const int len2 = end - pivot;
+
+    if (len1 == 0 || len2 == 0)
+        return;
+
+    if (len1 + len2 == 2) {
+        if (lessThan(*(begin + 1), *(begin)))
+            qSwap(*begin, *(begin + 1));
+        return;
+    }
+
+    RandomAccessIterator firstCut;
+    RandomAccessIterator secondCut;
+    int len2Half;
+    if (len1 > len2) {
+        const int len1Half = len1 / 2;
+        firstCut = begin + len1Half;
+        secondCut = qLowerBound(pivot, end, *firstCut, lessThan);
+        len2Half = secondCut - pivot;
+    } else {
+        len2Half = len2 / 2;
+        secondCut = pivot + len2Half;
+        firstCut = qUpperBound(begin, pivot, *secondCut, lessThan);
+    }
+
+    qRotate(firstCut, pivot, secondCut);
+    const RandomAccessIterator newPivot = firstCut + len2Half;
+    qMerge(begin, firstCut, newPivot, t, lessThan);
+    qMerge(newPivot, secondCut, end, t, lessThan);
+}
+
+template <typename RandomAccessIterator, typename T, typename LessThan>
+Q_OUTOFLINE_TEMPLATE void qStableSortHelper(RandomAccessIterator begin, RandomAccessIterator end, const T &t, LessThan lessThan)
+{
+    const int span = end - begin;
+    if (span < 2)
+       return;
+
+    const RandomAccessIterator middle = begin + span / 2;
+    qStableSortHelper(begin, middle, t, lessThan);
+    qStableSortHelper(middle, end, t, lessThan);
+    qMerge(begin, middle, end, t, lessThan);
+}
+
+template <typename RandomAccessIterator, typename T>
+inline void qStableSortHelper(RandomAccessIterator begin, RandomAccessIterator end, const T &dummy)
+{
+    qStableSortHelper(begin, end, dummy, qLess<T>());
+}
+
+template <typename RandomAccessIterator, typename T, typename LessThan>
+Q_OUTOFLINE_TEMPLATE RandomAccessIterator qLowerBoundHelper(RandomAccessIterator begin, RandomAccessIterator end, const T &value, LessThan lessThan)
+{
+    RandomAccessIterator middle;
+    int n = int(end - begin);
+    int half;
+
+    while (n > 0) {
+        half = n >> 1;
+        middle = begin + half;
+        if (lessThan(*middle, value)) {
+            begin = middle + 1;
+            n -= half + 1;
+        } else {
+            n = half;
+        }
+    }
+    return begin;
+}
+
+
+template <typename RandomAccessIterator, typename T, typename LessThan>
+Q_OUTOFLINE_TEMPLATE RandomAccessIterator qUpperBoundHelper(RandomAccessIterator begin, RandomAccessIterator end, const T &value, LessThan lessThan)
+{
+    RandomAccessIterator middle;
+    int n = end - begin;
+    int half;
+
+    while (n > 0) {
+        half = n >> 1;
+        middle = begin + half;
+        if (lessThan(value, *middle)) {
+            n = half;
+        } else {
+            begin = middle + 1;
+            n -= half + 1;
+        }
+    }
+    return begin;
+}
+
+template <typename RandomAccessIterator, typename T, typename LessThan>
+Q_OUTOFLINE_TEMPLATE RandomAccessIterator qBinaryFindHelper(RandomAccessIterator begin, RandomAccessIterator end, const T &value, LessThan lessThan)
+{
+    RandomAccessIterator it = qLowerBoundHelper(begin, end, value, lessThan);
+
+    if (it == end || lessThan(value, *it))
+        return end;
+
+    return it;
+}
+
+} //namespace QAlgorithmsPrivate
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QALGORITHMS_H