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diff --git a/src/corelib/tools/qmap.cpp b/src/corelib/tools/qmap.cpp
new file mode 100644
index 0000000000..9e13fcc05e
--- /dev/null
+++ b/src/corelib/tools/qmap.cpp
@@ -0,0 +1,1646 @@
+/****************************************************************************
+**
+** 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qmap.h"
+
+#include <stdlib.h>
+
+#ifdef QT_QMAP_DEBUG
+# include <qstring.h>
+# include <qvector.h>
+#endif
+
+QT_BEGIN_NAMESPACE
+
+QMapData QMapData::shared_null = {
+    &shared_null,
+    { &shared_null, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+    Q_BASIC_ATOMIC_INITIALIZER(1), 0, 0, 0, false, true, false, 0
+};
+
+QMapData *QMapData::createData()
+{
+    return createData(0);
+}
+
+QMapData *QMapData::createData(int alignment)
+{
+    QMapData *d = new QMapData;
+    Q_CHECK_PTR(d);
+    Node *e = reinterpret_cast<Node *>(d);
+    e->backward = e;
+    e->forward[0] = e;
+    d->ref = 1;
+    d->topLevel = 0;
+    d->size = 0;
+    d->randomBits = 0;
+    d->insertInOrder = false;
+    d->sharable = true;
+    d->strictAlignment = alignment > 8;
+    d->reserved = 0;
+    return d;
+}
+
+void QMapData::continueFreeData(int offset)
+{
+    Node *e = reinterpret_cast<Node *>(this);
+    Node *cur = e->forward[0];
+    Node *prev;
+    while (cur != e) {
+        prev = cur;
+        cur = cur->forward[0];
+        if (strictAlignment)
+            qFreeAligned(reinterpret_cast<char *>(prev) - offset);
+        else
+            qFree(reinterpret_cast<char *>(prev) - offset);
+    }
+    delete this;
+}
+
+QMapData::Node *QMapData::node_create(Node *update[], int offset)
+{
+    return node_create(update, offset, 0);
+}
+
+/*!
+    Creates a new node inside the data structure.
+
+    \a update is an array with pointers to the node after which the new node
+    should be inserted. Because of the strange skip list data structure there
+    could be several pointers to this node on different levels.
+    \a offset is an amount of bytes that needs to reserved just before the
+    QMapData::Node structure.
+
+    \a alignment dictates the alignment for the data.
+
+    \internal
+    \since 4.6
+*/
+QMapData::Node *QMapData::node_create(Node *update[], int offset, int alignment)
+{
+    int level = 0;
+    uint mask = (1 << Sparseness) - 1;
+
+    while ((randomBits & mask) == mask && level < LastLevel) {
+        ++level;
+        mask <<= Sparseness;
+    }
+
+    if (level > topLevel) {
+        Node *e = reinterpret_cast<Node *>(this);
+        level = ++topLevel;
+        e->forward[level] = e;
+        update[level] = e;
+    }
+
+    ++randomBits;
+    if (level == 3 && !insertInOrder)
+        randomBits = qrand();
+
+    void *concreteNode = strictAlignment ?
+                         qMallocAligned(offset + sizeof(Node) + level * sizeof(Node *), alignment) :
+                         qMalloc(offset + sizeof(Node) + level * sizeof(Node *));
+    Q_CHECK_PTR(concreteNode);
+
+    Node *abstractNode = reinterpret_cast<Node *>(reinterpret_cast<char *>(concreteNode) + offset);
+
+    abstractNode->backward = update[0];
+    update[0]->forward[0]->backward = abstractNode;
+
+    for (int i = level; i >= 0; i--) {
+        abstractNode->forward[i] = update[i]->forward[i];
+        update[i]->forward[i] = abstractNode;
+        update[i] = abstractNode;
+    }
+    ++size;
+    return abstractNode;
+}
+
+void QMapData::node_delete(Node *update[], int offset, Node *node)
+{
+    node->forward[0]->backward = node->backward;
+
+    for (int i = 0; i <= topLevel; ++i) {
+        if (update[i]->forward[i] != node)
+            break;
+        update[i]->forward[i] = node->forward[i];
+    }
+    --size;
+    if (strictAlignment)
+        qFreeAligned(reinterpret_cast<char *>(node) - offset);
+    else
+        qFree(reinterpret_cast<char *>(node) - offset);
+}
+
+#ifdef QT_QMAP_DEBUG
+
+uint QMapData::adjust_ptr(Node *node)
+{
+    if (node == reinterpret_cast<Node *>(this)) {
+       return (uint)0xDEADBEEF;
+    } else {
+        return (uint)node;
+    }
+}
+
+void QMapData::dump()
+{
+    qDebug("Map data (ref = %d, size = %d, randomBits = %#.8x)", int(ref), size, randomBits);
+
+    QString preOutput;
+    QVector<QString> output(topLevel + 1);
+    Node *e = reinterpret_cast<Node *>(this);
+
+    QString str;
+    str.sprintf("    %.8x", adjust_ptr(reinterpret_cast<Node *>(this)));
+    preOutput += str;
+
+    Node *update[LastLevel + 1];
+    for (int i = 0; i <= topLevel; ++i) {
+        str.sprintf("%d: [%.8x] -", i, adjust_ptr(reinterpret_cast<Node *>(forward[i])));
+        output[i] += str;
+        update[i] = reinterpret_cast<Node *>(forward[i]);
+    }
+
+    Node *node = reinterpret_cast<Node *>(forward[0]);
+    while (node != e) {
+        int level = 0;
+        while (level < topLevel && update[level + 1] == node)
+            ++level;
+
+        str.sprintf("       %.8x", adjust_ptr(node));
+        preOutput += str;
+
+        for (int i = 0; i <= level; ++i) {
+            str.sprintf("-> [%.8x] -", adjust_ptr(node->forward[i]));
+            output[i] += str;
+            update[i] = node->forward[i];
+        }
+        for (int j = level + 1; j <= topLevel; ++j)
+            output[j] += QLatin1String("---------------");
+        node = node->forward[0];
+    }
+
+    qDebug("%s", preOutput.ascii());
+    for (int i = 0; i <= topLevel; ++i)
+        qDebug("%s", output[i].ascii());
+}
+#endif
+
+/*!
+    \class QMap
+    \brief The QMap class is a template class that provides a skip-list-based dictionary.
+
+    \ingroup tools
+    \ingroup shared
+
+    \reentrant
+
+    QMap\<Key, T\> is one of Qt's generic \l{container classes}. It
+    stores (key, value) pairs and provides fast lookup of the
+    value associated with a key.
+
+    QMap and QHash provide very similar functionality. The
+    differences are:
+
+    \list
+    \i QHash provides faster lookups than QMap. (See \l{Algorithmic
+       Complexity} for details.)
+    \i When iterating over a QHash, the items are arbitrarily ordered.
+       With QMap, the items are always sorted by key.
+    \i The key type of a QHash must provide operator==() and a global
+       qHash(Key) function. The key type of a QMap must provide
+       operator<() specifying a total order.
+    \endlist
+
+    Here's an example QMap with QString keys and \c int values:
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 0
+
+    To insert a (key, value) pair into the map, you can use operator[]():
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 1
+
+    This inserts the following three (key, value) pairs into the
+    QMap: ("one", 1), ("three", 3), and ("seven", 7). Another way to
+    insert items into the map is to use insert():
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 2
+
+    To look up a value, use operator[]() or value():
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 3
+
+    If there is no item with the specified key in the map, these
+    functions return a \l{default-constructed value}.
+
+    If you want to check whether the map contains a certain key, use
+    contains():
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 4
+
+    There is also a value() overload that uses its second argument as
+    a default value if there is no item with the specified key:
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 5
+
+    In general, we recommend that you use contains() and value()
+    rather than operator[]() for looking up a key in a map. The
+    reason is that operator[]() silently inserts an item into the
+    map if no item exists with the same key (unless the map is
+    const). For example, the following code snippet will create 1000
+    items in memory:
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 6
+
+    To avoid this problem, replace \c map[i] with \c map.value(i)
+    in the code above.
+
+    If you want to navigate through all the (key, value) pairs stored
+    in a QMap, you can use an iterator. QMap provides both
+    \l{Java-style iterators} (QMapIterator and QMutableMapIterator)
+    and \l{STL-style iterators} (QMap::const_iterator and
+    QMap::iterator). Here's how to iterate over a QMap<QString, int>
+    using a Java-style iterator:
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 7
+
+    Here's the same code, but using an STL-style iterator this time:
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 8
+
+    The items are traversed in ascending key order.
+
+    Normally, a QMap allows only one value per key. If you call
+    insert() with a key that already exists in the QMap, the
+    previous value will be erased. For example:
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 9
+
+    However, you can store multiple values per key by using
+    insertMulti() instead of insert() (or using the convenience
+    subclass QMultiMap). If you want to retrieve all the values for a
+    single key, you can use values(const Key &key), which returns a
+    QList<T>:
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 10
+
+    The items that share the same key are available from most
+    recently to least recently inserted. Another approach is to call
+    find() to get the STL-style iterator for the first item with a
+    key and iterate from there:
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 11
+
+    If you only need to extract the values from a map (not the keys),
+    you can also use \l{foreach}:
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 12
+
+    Items can be removed from the map in several ways. One way is to
+    call remove(); this will remove any item with the given key.
+    Another way is to use QMutableMapIterator::remove(). In addition,
+    you can clear the entire map using clear().
+
+    QMap's key and value data types must be \l{assignable data
+    types}. This covers most data types you are likely to encounter,
+    but the compiler won't let you, for example, store a QWidget as a
+    value; instead, store a QWidget *. In addition, QMap's key type
+    must provide operator<(). QMap uses it to keep its items sorted,
+    and assumes that two keys \c x and \c y are equal if neither \c{x
+    < y} nor \c{y < x} is true.
+
+    Example:
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 13
+
+    In the example, we start by comparing the employees' names. If
+    they're equal, we compare their dates of birth to break the tie.
+
+    \sa QMapIterator, QMutableMapIterator, QHash, QSet
+*/
+
+/*! \fn QMap::QMap()
+
+    Constructs an empty map.
+
+    \sa clear()
+*/
+
+/*! \fn QMap::QMap(const QMap<Key, T> &other)
+
+    Constructs a copy of \a other.
+
+    This operation occurs in \l{constant time}, because QMap is
+    \l{implicitly shared}. This makes returning a QMap from a
+    function very fast. If a shared instance is modified, it will be
+    copied (copy-on-write), and this takes \l{linear time}.
+
+    \sa operator=()
+*/
+
+/*! \fn QMap::QMap(const std::map<Key, T> & other)
+
+    Constructs a copy of \a other.
+
+    This function is only available if Qt is configured with STL
+    compatibility enabled.
+
+    \sa toStdMap()
+*/
+
+/*! \fn std::map<Key, T> QMap::toStdMap() const
+
+    Returns an STL map equivalent to this QMap.
+
+    This function is only available if Qt is configured with STL
+    compatibility enabled.
+*/
+
+/*! \fn QMap::~QMap()
+
+    Destroys the map. References to the values in the map, and all
+    iterators over this map, become invalid.
+*/
+
+/*! \fn QMap<Key, T> &QMap::operator=(const QMap<Key, T> &other)
+
+    Assigns \a other to this map and returns a reference to this map.
+*/
+
+/*! \fn void QMap::swap(QMap<Key, T> &other)
+    \since 4.8
+
+    Swaps map \a other with this map. This operation is very
+    fast and never fails.
+*/
+
+/*! \fn void QMultiMap::swap(QMultiMap<Key, T> &other)
+    \since 4.8
+
+    Swaps map \a other with this map. This operation is very
+    fast and never fails.
+*/
+
+/*! \fn bool QMap::operator==(const QMap<Key, T> &other) const
+
+    Returns true if \a other is equal to this map; otherwise returns
+    false.
+
+    Two maps are considered equal if they contain the same (key,
+    value) pairs.
+
+    This function requires the value type to implement \c
+    operator==().
+
+    \sa operator!=()
+*/
+
+/*! \fn bool QMap::operator!=(const QMap<Key, T> &other) const
+
+    Returns true if \a other is not equal to this map; otherwise
+    returns false.
+
+    Two maps are considered equal if they contain the same (key,
+    value) pairs.
+
+    This function requires the value type to implement \c
+    operator==().
+
+    \sa operator==()
+*/
+
+/*! \fn int QMap::size() const
+
+    Returns the number of (key, value) pairs in the map.
+
+    \sa isEmpty(), count()
+*/
+
+/*!
+    \fn bool QMap::isEmpty() const
+
+    Returns true if the map contains no items; otherwise returns
+    false.
+
+    \sa size()
+*/
+
+/*! \fn void QMap::detach()
+
+    \internal
+
+    Detaches this map from any other maps with which it may share
+    data.
+
+    \sa isDetached()
+*/
+
+/*! \fn bool QMap::isDetached() const
+
+    \internal
+
+    Returns true if the map's internal data isn't shared with any
+    other map object; otherwise returns false.
+
+    \sa detach()
+*/
+
+/*! \fn void QMap::setSharable(bool sharable)
+
+    \internal
+*/
+
+/*! \fn bool QMap::isSharedWith(const QMap<Key, T> &other) const
+
+    \internal
+*/
+
+/*! \fn void QMap::setInsertInOrder(bool sharable)
+
+    \internal
+*/
+
+/*! \fn void QMap::clear()
+
+    Removes all items from the map.
+
+    \sa remove()
+*/
+
+/*! \fn int QMap::remove(const Key &key)
+
+    Removes all the items that have the key \a key from the map.
+    Returns the number of items removed which is usually 1 but will be
+    0 if the key isn't in the map, or \> 1 if insertMulti() has been
+    used with the \a key.
+
+    \sa clear(), take(), QMultiMap::remove()
+*/
+
+/*! \fn T QMap::take(const Key &key)
+
+    Removes the item with the key \a key from the map and returns
+    the value associated with it.
+
+    If the item does not exist in the map, the function simply
+    returns a \l{default-constructed value}. If there are multiple
+    items for \a key in the map, only the most recently inserted one
+    is removed and returned.
+
+    If you don't use the return value, remove() is more efficient.
+
+    \sa remove()
+*/
+
+/*! \fn bool QMap::contains(const Key &key) const
+
+    Returns true if the map contains an item with key \a key;
+    otherwise returns false.
+
+    \sa count(), QMultiMap::contains()
+*/
+
+/*! \fn const T QMap::value(const Key &key) const
+
+    Returns the value associated with the key \a key.
+
+    If the map contains no item with key \a key, the function
+    returns a \l{default-constructed value}. If there are multiple
+    items for \a key in the map, the value of the most recently
+    inserted one is returned.
+
+    \sa key(), values(), contains(), operator[]()
+*/
+
+/*! \fn const T QMap::value(const Key &key, const T &defaultValue) const
+
+    \overload
+
+    If the map contains no item with key \a key, the function returns
+    \a defaultValue.
+*/
+
+/*! \fn T &QMap::operator[](const Key &key)
+
+    Returns the value associated with the key \a key as a modifiable
+    reference.
+
+    If the map contains no item with key \a key, the function inserts
+    a \l{default-constructed value} into the map with key \a key, and
+    returns a reference to it. If the map contains multiple items
+    with key \a key, this function returns a reference to the most
+    recently inserted value.
+
+    \sa insert(), value()
+*/
+
+/*! \fn const T QMap::operator[](const Key &key) const
+
+    \overload
+
+    Same as value().
+*/
+
+/*! \fn QList<Key> QMap::uniqueKeys() const
+    \since 4.2
+
+    Returns a list containing all the keys in the map in ascending
+    order. Keys that occur multiple times in the map (because items
+    were inserted with insertMulti(), or unite() was used) occur only
+    once in the returned list.
+
+    \sa keys(), values()
+*/
+
+/*! \fn QList<Key> QMap::keys() const
+
+    Returns a list containing all the keys in the map in ascending
+    order. Keys that occur multiple times in the map (because items
+    were inserted with insertMulti(), or unite() was used) also
+    occur multiple times in the list.
+
+    To obtain a list of unique keys, where each key from the map only
+    occurs once, use uniqueKeys().
+
+    The order is guaranteed to be the same as that used by values().
+
+    \sa uniqueKeys(), values(), key()
+*/
+
+/*! \fn QList<Key> QMap::keys(const T &value) const
+
+    \overload
+
+    Returns a list containing all the keys associated with value \a
+    value in ascending order.
+
+    This function can be slow (\l{linear time}), because QMap's
+    internal data structure is optimized for fast lookup by key, not
+    by value.
+*/
+
+/*! \fn Key QMap::key(const T &value) const
+
+    Returns the first key with value \a value.
+
+    If the map contains no item with value \a value, the function
+    returns a \link {default-constructed value} default-constructed
+    key \endlink.
+
+    This function can be slow (\l{linear time}), because QMap's
+    internal data structure is optimized for fast lookup by key, not
+    by value.
+
+    \sa value(), keys()
+*/
+
+/*!
+    \fn Key QMap::key(const T &value, const Key &defaultKey) const
+    \since 4.3
+    \overload
+
+    Returns the first key with value \a value, or \a defaultKey if
+    the map contains no item with value \a value.
+
+    This function can be slow (\l{linear time}), because QMap's
+    internal data structure is optimized for fast lookup by key, not
+    by value.
+*/
+
+/*! \fn QList<T> QMap::values() const
+
+    Returns a list containing all the values in the map, in ascending
+    order of their keys. If a key is associated with multiple values,
+    all of its values will be in the list, and not just the most
+    recently inserted one.
+
+    \sa keys(), value()
+*/
+
+/*! \fn QList<T> QMap::values(const Key &key) const
+
+    \overload
+
+    Returns a list containing all the values associated with key
+    \a key, from the most recently inserted to the least recently
+    inserted one.
+
+    \sa count(), insertMulti()
+*/
+
+/*! \fn int QMap::count(const Key &key) const
+
+    Returns the number of items associated with key \a key.
+
+    \sa contains(), insertMulti(), QMultiMap::count()
+*/
+
+/*! \fn int QMap::count() const
+
+    \overload
+
+    Same as size().
+*/
+
+/*! \fn QMap::iterator QMap::begin()
+
+    Returns an \l{STL-style iterator} pointing to the first item in
+    the map.
+
+    \sa constBegin(), end()
+*/
+
+/*! \fn QMap::const_iterator QMap::begin() const
+
+    \overload
+*/
+
+/*! \fn QMap::const_iterator QMap::constBegin() const
+
+    Returns a const \l{STL-style iterator} pointing to the first item
+    in the map.
+
+    \sa begin(), constEnd()
+*/
+
+/*! \fn QMap::iterator QMap::end()
+
+    Returns an \l{STL-style iterator} pointing to the imaginary item
+    after the last item in the map.
+
+    \sa begin(), constEnd()
+*/
+
+/*! \fn QMap::const_iterator QMap::end() const
+
+    \overload
+*/
+
+/*! \fn QMap::const_iterator QMap::constEnd() const
+
+    Returns a const \l{STL-style iterator} pointing to the imaginary
+    item after the last item in the map.
+
+    \sa constBegin(), end()
+*/
+
+/*! \fn QMap::iterator QMap::erase(iterator pos)
+
+    Removes the (key, value) pair pointed to by the iterator \a pos
+    from the map, and returns an iterator to the next item in the
+    map.
+
+    \sa remove()
+*/
+
+/*! \fn QMap::iterator QMap::find(const Key &key)
+
+    Returns an iterator pointing to the item with key \a key in the
+    map.
+
+    If the map contains no item with key \a key, the function
+    returns end().
+
+    If the map contains multiple items with key \a key, this
+    function returns an iterator that points to the most recently
+    inserted value. The other values are accessible by incrementing
+    the iterator. For example, here's some code that iterates over all
+    the items with the same key:
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 14
+
+    \sa constFind(), value(), values(), lowerBound(), upperBound(), QMultiMap::find()
+*/
+
+/*! \fn QMap::const_iterator QMap::find(const Key &key) const
+
+    \overload
+*/
+
+/*! \fn QMap::iterator QMap::constFind(const Key &key) const
+    \since 4.1
+
+    Returns an const iterator pointing to the item with key \a key in the
+    map.
+
+    If the map contains no item with key \a key, the function
+    returns constEnd().
+
+    \sa find(), QMultiMap::constFind()
+*/
+
+/*! \fn QMap::iterator QMap::lowerBound(const Key &key)
+
+    Returns an iterator pointing to the first item with key \a key in
+    the map. If the map contains no item with key \a key, the
+    function returns an iterator to the nearest item with a greater
+    key.
+
+    Example:
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 15
+
+    If the map contains multiple items with key \a key, this
+    function returns an iterator that points to the most recently
+    inserted value. The other values are accessible by incrementing
+    the iterator. For example, here's some code that iterates over all
+    the items with the same key:
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 16
+
+    \sa qLowerBound(), upperBound(), find()
+*/
+
+/*! \fn QMap::const_iterator QMap::lowerBound(const Key &key) const
+
+    \overload
+*/
+
+/*! \fn QMap::iterator QMap::upperBound(const Key &key)
+
+    Returns an iterator pointing to the item that immediately follows
+    the last item with key \a key in the map. If the map contains no
+    item with key \a key, the function returns an iterator to the
+    nearest item with a greater key.
+
+    Example:
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 17
+
+    \sa qUpperBound(), lowerBound(), find()
+*/
+
+/*! \fn QMap::const_iterator QMap::upperBound(const Key &key) const
+
+    \overload
+*/
+
+/*! \fn QMap::iterator QMap::insert(const Key &key, const T &value)
+
+    Inserts a new item with the key \a key and a value of \a value.
+
+    If there is already an item with the key \a key, that item's value
+    is replaced with \a value.
+
+    If there are multiple items with the key \a key, the most
+    recently inserted item's value is replaced with \a value.
+
+    \sa insertMulti()
+*/
+
+/*! \fn QMap::iterator QMap::insertMulti(const Key &key, const T &value)
+
+    Inserts a new item with the key \a key and a value of \a value.
+
+    If there is already an item with the same key in the map, this
+    function will simply create a new one. (This behavior is
+    different from insert(), which overwrites the value of an
+    existing item.)
+
+    \sa insert(), values()
+*/
+
+/*! \fn QMap<Key, T> &QMap::unite(const QMap<Key, T> &other)
+
+    Inserts all the items in the \a other map into this map. If a
+    key is common to both maps, the resulting map will contain the
+    key multiple times.
+
+    \sa insertMulti()
+*/
+
+/*! \typedef QMap::Iterator
+
+    Qt-style synonym for QMap::iterator.
+*/
+
+/*! \typedef QMap::ConstIterator
+
+    Qt-style synonym for QMap::const_iterator.
+*/
+
+/*! \typedef QMap::difference_type
+
+    Typedef for ptrdiff_t. Provided for STL compatibility.
+*/
+
+/*! \typedef QMap::key_type
+
+    Typedef for Key. Provided for STL compatibility.
+*/
+
+/*! \typedef QMap::mapped_type
+
+    Typedef for T. Provided for STL compatibility.
+*/
+
+/*! \typedef QMap::size_type
+
+    Typedef for int. Provided for STL compatibility.
+*/
+
+/*!
+    \fn bool QMap::empty() const
+
+    This function is provided for STL compatibility. It is equivalent
+    to isEmpty(), returning true if the map is empty; otherwise
+    returning false.
+*/
+
+/*! \class QMap::iterator
+    \brief The QMap::iterator class provides an STL-style non-const iterator for QMap and QMultiMap.
+
+    QMap features both \l{STL-style iterators} and \l{Java-style
+    iterators}. The STL-style iterators are more low-level and more
+    cumbersome to use; on the other hand, they are slightly faster
+    and, for developers who already know STL, have the advantage of
+    familiarity.
+
+    QMap\<Key, T\>::iterator allows you to iterate over a QMap (or
+    QMultiMap) and to modify the value (but not the key) stored under
+    a particular key. If you want to iterate over a const QMap, you
+    should use QMap::const_iterator. It is generally good practice to
+    use QMap::const_iterator on a non-const QMap as well, unless you
+    need to change the QMap through the iterator. Const iterators are
+    slightly faster, and can improve code readability.
+
+    The default QMap::iterator constructor creates an uninitialized
+    iterator. You must initialize it using a QMap function like
+    QMap::begin(), QMap::end(), or QMap::find() before you can
+    start iterating. Here's a typical loop that prints all the (key,
+    value) pairs stored in a map:
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 18
+
+    Unlike QHash, which stores its items in an arbitrary order, QMap
+    stores its items ordered by key. Items that share the same key
+    (because they were inserted using QMap::insertMulti(), or due to a
+    unite()) will appear consecutively, from the most recently to the
+    least recently inserted value.
+
+    Let's see a few examples of things we can do with a
+    QMap::iterator that we cannot do with a QMap::const_iterator.
+    Here's an example that increments every value stored in the QMap
+    by 2:
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 19
+
+    Here's an example that removes all the items whose key is a
+    string that starts with an underscore character:
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 20
+
+    The call to QMap::erase() removes the item pointed to by the
+    iterator from the map, and returns an iterator to the next item.
+    Here's another way of removing an item while iterating:
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 21
+
+    It might be tempting to write code like this:
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 22
+
+    However, this will potentially crash in \c{++i}, because \c i is
+    a dangling iterator after the call to erase().
+
+    Multiple iterators can be used on the same map. If you add items
+    to the map, existing iterators will remain valid. If you remove
+    items from the map, iterators that point to the removed items
+    will become dangling iterators.
+
+    \sa QMap::const_iterator, QMutableMapIterator
+*/
+
+/*! \fn QMap::iterator::operator QMapData::Node *() const
+
+    \internal
+*/
+
+/*! \typedef QMap::iterator::difference_type
+
+    \internal
+*/
+
+/*! \typedef QMap::iterator::iterator_category
+
+  A synonym for \e {std::bidirectional_iterator_tag} indicating
+  this iterator is a bidirectional iterator.
+*/
+
+/*! \typedef QMap::iterator::pointer
+
+    \internal
+*/
+
+/*! \typedef QMap::iterator::reference
+
+    \internal
+*/
+
+/*! \typedef QMap::iterator::value_type
+
+    \internal
+*/
+
+/*! \fn QMap::iterator::iterator()
+
+    Constructs an uninitialized iterator.
+
+    Functions like key(), value(), and operator++() must not be
+    called on an uninitialized iterator. Use operator=() to assign a
+    value to it before using it.
+
+    \sa QMap::begin() QMap::end()
+*/
+
+/*! \fn QMap::iterator::iterator(QMapData::Node *node)
+
+    \internal
+*/
+
+/*! \fn const Key &QMap::iterator::key() const
+
+    Returns the current item's key as a const reference.
+
+    There is no direct way of changing an item's key through an
+    iterator, although it can be done by calling QMap::erase()
+    followed by QMap::insert() or QMap::insertMulti().
+
+    \sa value()
+*/
+
+/*! \fn T &QMap::iterator::value() const
+
+    Returns a modifiable reference to the current item's value.
+
+    You can change the value of an item by using value() on
+    the left side of an assignment, for example:
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 23
+
+    \sa key(), operator*()
+*/
+
+/*! \fn T &QMap::iterator::operator*() const
+
+    Returns a modifiable reference to the current item's value.
+
+    Same as value().
+
+    \sa key()
+*/
+
+/*! \fn T *QMap::iterator::operator->() const
+
+    Returns a pointer to the current item's value.
+
+    \sa value()
+*/
+
+/*!
+    \fn bool QMap::iterator::operator==(const iterator &other) const
+    \fn bool QMap::iterator::operator==(const const_iterator &other) const
+
+    Returns true if \a other points to the same item as this
+    iterator; otherwise returns false.
+
+    \sa operator!=()
+*/
+
+/*!
+    \fn bool QMap::iterator::operator!=(const iterator &other) const
+    \fn bool QMap::iterator::operator!=(const const_iterator &other) const
+
+    Returns true if \a other points to a different item than this
+    iterator; otherwise returns false.
+
+    \sa operator==()
+*/
+
+/*! \fn QMap::iterator QMap::iterator::operator++()
+
+    The prefix ++ operator (\c{++i}) advances the iterator to the
+    next item in the map and returns an iterator to the new current
+    item.
+
+    Calling this function on QMap::end() leads to undefined results.
+
+    \sa operator--()
+*/
+
+/*! \fn QMap::iterator QMap::iterator::operator++(int)
+
+    \overload
+
+    The postfix ++ operator (\c{i++}) advances the iterator to the
+    next item in the map and returns an iterator to the previously
+    current item.
+*/
+
+/*! \fn QMap::iterator QMap::iterator::operator--()
+
+    The prefix -- operator (\c{--i}) makes the preceding item
+    current and returns an iterator pointing to the new current item.
+
+    Calling this function on QMap::begin() leads to undefined
+    results.
+
+    \sa operator++()
+*/
+
+/*! \fn QMap::iterator QMap::iterator::operator--(int)
+
+    \overload
+
+    The postfix -- operator (\c{i--}) makes the preceding item
+    current and returns an iterator pointing to the previously
+    current item.
+*/
+
+/*! \fn QMap::iterator QMap::iterator::operator+(int j) const
+
+    Returns an iterator to the item at \a j positions forward from
+    this iterator. (If \a j is negative, the iterator goes backward.)
+
+    This operation can be slow for large \a j values.
+
+    \sa operator-()
+
+*/
+
+/*! \fn QMap::iterator QMap::iterator::operator-(int j) const
+
+    Returns an iterator to the item at \a j positions backward from
+    this iterator. (If \a j is negative, the iterator goes forward.)
+
+    This operation can be slow for large \a j values.
+
+    \sa operator+()
+*/
+
+/*! \fn QMap::iterator &QMap::iterator::operator+=(int j)
+
+    Advances the iterator by \a j items. (If \a j is negative, the
+    iterator goes backward.)
+
+    \sa operator-=(), operator+()
+*/
+
+/*! \fn QMap::iterator &QMap::iterator::operator-=(int j)
+
+    Makes the iterator go back by \a j items. (If \a j is negative,
+    the iterator goes forward.)
+
+    \sa operator+=(), operator-()
+*/
+
+/*! \class QMap::const_iterator
+    \brief The QMap::const_iterator class provides an STL-style const iterator for QMap and QMultiMap.
+
+    QMap features both \l{STL-style iterators} and \l{Java-style
+    iterators}. The STL-style iterators are more low-level and more
+    cumbersome to use; on the other hand, they are slightly faster
+    and, for developers who already know STL, have the advantage of
+    familiarity.
+
+    QMap\<Key, T\>::const_iterator allows you to iterate over a QMap
+    (or a QMultiMap). If you want to modify the QMap as you iterate
+    over it, you must use QMap::iterator instead. It is generally
+    good practice to use QMap::const_iterator on a non-const QMap as
+    well, unless you need to change the QMap through the iterator.
+    Const iterators are slightly faster, and can improve code
+    readability.
+
+    The default QMap::const_iterator constructor creates an
+    uninitialized iterator. You must initialize it using a QMap
+    function like QMap::constBegin(), QMap::constEnd(), or
+    QMap::find() before you can start iterating. Here's a typical
+    loop that prints all the (key, value) pairs stored in a map:
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 24
+
+    Unlike QHash, which stores its items in an arbitrary order, QMap
+    stores its items ordered by key. Items that share the same key
+    (because they were inserted using QMap::insertMulti()) will
+    appear consecutively, from the most recently to the least
+    recently inserted value.
+
+    Multiple iterators can be used on the same map. If you add items
+    to the map, existing iterators will remain valid. If you remove
+    items from the map, iterators that point to the removed items
+    will become dangling iterators.
+
+    \sa QMap::iterator, QMapIterator
+*/
+
+/*! \fn QMap::const_iterator::operator QMapData::Node *() const
+
+    \internal
+*/
+
+/*! \typedef QMap::const_iterator::difference_type
+
+    \internal
+*/
+
+/*! \typedef QMap::const_iterator::iterator_category
+
+  A synonym for \e {std::bidirectional_iterator_tag} indicating
+  this iterator is a bidirectional iterator.
+*/
+
+/*! \typedef QMap::const_iterator::pointer
+
+    \internal
+*/
+
+/*! \typedef QMap::const_iterator::reference
+
+    \internal
+*/
+
+/*! \typedef QMap::const_iterator::value_type
+
+    \internal
+*/
+
+/*! \fn QMap::const_iterator::const_iterator()
+
+    Constructs an uninitialized iterator.
+
+    Functions like key(), value(), and operator++() must not be
+    called on an uninitialized iterator. Use operator=() to assign a
+    value to it before using it.
+
+    \sa QMap::constBegin() QMap::constEnd()
+*/
+
+/*! \fn QMap::const_iterator::const_iterator(QMapData::Node *node)
+
+    \internal
+*/
+
+/*! \fn QMap::const_iterator::const_iterator(const iterator &other)
+
+    Constructs a copy of \a other.
+*/
+
+/*! \fn const Key &QMap::const_iterator::key() const
+
+    Returns the current item's key.
+
+    \sa value()
+*/
+
+/*! \fn const T &QMap::const_iterator::value() const
+
+    Returns the current item's value.
+
+    \sa key(), operator*()
+*/
+
+/*! \fn const T &QMap::const_iterator::operator*() const
+
+    Returns the current item's value.
+
+    Same as value().
+
+    \sa key()
+*/
+
+/*! \fn const T *QMap::const_iterator::operator->() const
+
+    Returns a pointer to the current item's value.
+
+    \sa value()
+*/
+
+/*! \fn bool QMap::const_iterator::operator==(const const_iterator &other) const
+
+    Returns true if \a other points to the same item as this
+    iterator; otherwise returns false.
+
+    \sa operator!=()
+*/
+
+/*! \fn bool QMap::const_iterator::operator!=(const const_iterator &other) const
+
+    Returns true if \a other points to a different item than this
+    iterator; otherwise returns false.
+
+    \sa operator==()
+*/
+
+/*! \fn QMap::const_iterator QMap::const_iterator::operator++()
+
+    The prefix ++ operator (\c{++i}) advances the iterator to the
+    next item in the map and returns an iterator to the new current
+    item.
+
+    Calling this function on QMap::end() leads to undefined results.
+
+    \sa operator--()
+*/
+
+/*! \fn QMap::const_iterator QMap::const_iterator::operator++(int)
+
+    \overload
+
+    The postfix ++ operator (\c{i++}) advances the iterator to the
+    next item in the map and returns an iterator to the previously
+    current item.
+*/
+
+/*! \fn QMap::const_iterator &QMap::const_iterator::operator--()
+
+    The prefix -- operator (\c{--i}) makes the preceding item
+    current and returns an iterator pointing to the new current item.
+
+    Calling this function on QMap::begin() leads to undefined
+    results.
+
+    \sa operator++()
+*/
+
+/*! \fn QMap::const_iterator QMap::const_iterator::operator--(int)
+
+    \overload
+
+    The postfix -- operator (\c{i--}) makes the preceding item
+    current and returns an iterator pointing to the previously
+    current item.
+*/
+
+/*! \fn QMap::const_iterator QMap::const_iterator::operator+(int j) const
+
+    Returns an iterator to the item at \a j positions forward from
+    this iterator. (If \a j is negative, the iterator goes backward.)
+
+    This operation can be slow for large \a j values.
+
+    \sa operator-()
+*/
+
+/*! \fn QMap::const_iterator QMap::const_iterator::operator-(int j) const
+
+    Returns an iterator to the item at \a j positions backward from
+    this iterator. (If \a j is negative, the iterator goes forward.)
+
+    This operation can be slow for large \a j values.
+
+    \sa operator+()
+*/
+
+/*! \fn QMap::const_iterator &QMap::const_iterator::operator+=(int j)
+
+    Advances the iterator by \a j items. (If \a j is negative, the
+    iterator goes backward.)
+
+    This operation can be slow for large \a j values.
+
+    \sa operator-=(), operator+()
+*/
+
+/*! \fn QMap::const_iterator &QMap::const_iterator::operator-=(int j)
+
+    Makes the iterator go back by \a j items. (If \a j is negative,
+    the iterator goes forward.)
+
+    This operation can be slow for large \a j values.
+
+    \sa operator+=(), operator-()
+*/
+
+/*! \fn QDataStream &operator<<(QDataStream &out, const QMap<Key, T> &map)
+    \relates QMap
+
+    Writes the map \a map to stream \a out.
+
+    This function requires the key and value types to implement \c
+    operator<<().
+
+    \sa \link datastreamformat.html Format of the QDataStream operators \endlink
+*/
+
+/*! \fn QDataStream &operator>>(QDataStream &in, QMap<Key, T> &map)
+    \relates QMap
+
+    Reads a map from stream \a in into \a map.
+
+    This function requires the key and value types to implement \c
+    operator>>().
+
+    \sa \link datastreamformat.html Format of the QDataStream operators \endlink
+*/
+
+/*! \class QMultiMap
+    \brief The QMultiMap class is a convenience QMap subclass that provides multi-valued maps.
+
+    \ingroup tools
+    \ingroup shared
+
+    \reentrant
+
+    QMultiMap\<Key, T\> is one of Qt's generic \l{container classes}.
+    It inherits QMap and extends it with a few convenience functions
+    that make it more suitable than QMap for storing multi-valued
+    maps. A multi-valued map is a map that allows multiple values
+    with the same key; QMap normally doesn't allow that, unless you
+    call QMap::insertMulti().
+
+    Because QMultiMap inherits QMap, all of QMap's functionality also
+    applies to QMultiMap. For example, you can use isEmpty() to test
+    whether the map is empty, and you can traverse a QMultiMap using
+    QMap's iterator classes (for example, QMapIterator). But in
+    addition, it provides an insert() function that corresponds to
+    QMap::insertMulti(), and a replace() function that corresponds to
+    QMap::insert(). It also provides convenient operator+() and
+    operator+=().
+
+    Example:
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 25
+
+    Unlike QMap, QMultiMap provides no operator[]. Use value() or
+    replace() if you want to access the most recently inserted item
+    with a certain key.
+
+    If you want to retrieve all the values for a single key, you can
+    use values(const Key &key), which returns a QList<T>:
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 26
+
+    The items that share the same key are available from most
+    recently to least recently inserted.
+
+    If you prefer the STL-style iterators, you can call find() to get
+    the iterator for the first item with a key and iterate from
+    there:
+
+    \snippet doc/src/snippets/code/src_corelib_tools_qmap.cpp 27
+
+    QMultiMap's key and value data types must be \l{assignable data
+    types}. This covers most data types you are likely to encounter,
+    but the compiler won't let you, for example, store a QWidget as a
+    value; instead, store a QWidget *. In addition, QMultiMap's key type
+    must provide operator<(). See the QMap documentation for details.
+
+    \sa QMap, QMapIterator, QMutableMapIterator, QMultiHash
+*/
+
+/*! \fn QMultiMap::QMultiMap()
+
+    Constructs an empty map.
+*/
+
+/*! \fn QMultiMap::QMultiMap(const QMap<Key, T> &other)
+
+    Constructs a copy of \a other (which can be a QMap or a
+    QMultiMap).
+
+    \sa operator=()
+*/
+
+/*! \fn QMultiMap::iterator QMultiMap::replace(const Key &key, const T &value)
+
+    Inserts a new item with the key \a key and a value of \a value.
+
+    If there is already an item with the key \a key, that item's value
+    is replaced with \a value.
+
+    If there are multiple items with the key \a key, the most
+    recently inserted item's value is replaced with \a value.
+
+    \sa insert()
+*/
+
+/*! \fn QMultiMap::iterator QMultiMap::insert(const Key &key, const T &value)
+
+    Inserts a new item with the key \a key and a value of \a value.
+
+    If there is already an item with the same key in the map, this
+    function will simply create a new one. (This behavior is
+    different from replace(), which overwrites the value of an
+    existing item.)
+
+    \sa replace()
+*/
+
+/*! \fn QMultiMap &QMultiMap::operator+=(const QMultiMap &other)
+
+    Inserts all the items in the \a other map into this map and
+    returns a reference to this map.
+
+    \sa insert(), operator+()
+*/
+
+/*! \fn QMultiMap QMultiMap::operator+(const QMultiMap &other) const
+
+    Returns a map that contains all the items in this map in
+    addition to all the items in \a other. If a key is common to both
+    maps, the resulting map will contain the key multiple times.
+
+    \sa operator+=()
+*/
+
+/*!
+    \fn bool QMultiMap::contains(const Key &key, const T &value) const
+    \since 4.3
+
+    Returns true if the map contains an item with key \a key and
+    value \a value; otherwise returns false.
+
+    \sa QMap::contains()
+*/
+
+/*!
+    \fn bool QMultiMap::contains(const Key &key) const
+    \overload
+    \sa QMap::contains()
+*/
+
+/*!
+    \fn int QMultiMap::remove(const Key &key, const T &value)
+    \since 4.3
+
+    Removes all the items that have the key \a key and the value \a
+    value from the map. Returns the number of items removed.
+
+    \sa QMap::remove()
+*/
+
+/*!
+    \fn int QMultiMap::remove(const Key &key)
+    \overload
+    \sa QMap::remove()
+*/
+
+/*!
+    \fn int QMultiMap::count(const Key &key, const T &value) const
+    \since 4.3
+
+    Returns the number of items with key \a key and value \a value.
+
+    \sa QMap::count()
+*/
+
+/*!
+    \fn int QMultiMap::count(const Key &key) const
+    \overload
+    \sa QMap::count()
+*/
+
+/*!
+    \fn int QMultiMap::count() const
+    \overload
+    \sa QMap::count()
+*/
+
+/*!
+    \fn typename QMap<Key, T>::iterator QMultiMap::find(const Key &key, const T &value)
+    \since 4.3
+
+    Returns an iterator pointing to the item with key \a key and
+    value \a value in the map.
+
+    If the map contains no such item, the function returns end().
+
+    If the map contains multiple items with key \a key, this
+    function returns an iterator that points to the most recently
+    inserted value.
+
+    \sa QMap::find()
+*/
+
+/*!
+    \fn typename QMap<Key, T>::iterator QMultiMap::find(const Key &key)
+    \overload
+    \sa QMap::find()
+*/
+
+/*!
+    \fn typename QMap<Key, T>::const_iterator QMultiMap::find(const Key &key, const T &value) const
+    \since 4.3
+    \overload
+
+    Returns a const iterator pointing to the item with the given \a key and
+    \a value in the map.
+
+    If the map contains no such item, the function returns end().
+
+    If the map contains multiple items with the specified \a key, this
+    function returns a const iterator that points to the most recently
+    inserted value.
+
+    \sa QMap::find()
+*/
+
+/*!
+    \fn typename QMap<Key, T>::const_iterator QMultiMap::find(const Key &key) const
+    \since 4.3
+    \overload
+    \sa QMap::find()
+*/
+
+/*!
+    \fn typename QMap<Key, T>::const_iterator QMultiMap::constFind(const Key &key, const T &value) const
+    \since 4.3
+
+    Returns an iterator pointing to the item with key \a key and the
+    value \a value in the map.
+
+    If the map contains no such item, the function returns
+    constEnd().
+
+    \sa QMap::constFind()
+*/
+
+/*!
+    \fn typename QMap<Key, T>::const_iterator QMultiMap::constFind(const Key &key) const
+    \overload
+    \sa QMap::constFind()
+*/
+
+/*!
+    \fn T &QMap::iterator::data() const
+
+    Use value() instead.
+*/
+
+/*!
+    \fn const T &QMap::const_iterator::data() const
+
+    Use value() instead.
+*/
+
+/*!
+    \fn iterator QMap::remove(iterator it)
+
+    Use erase(\a it) instead.
+*/
+
+/*!
+    \fn void QMap::erase(const Key &key)
+
+    Use remove(\a key) instead.
+*/
+
+/*!
+    \fn iterator QMap::insert(const Key &key, const T &value, bool overwrite);
+
+    Use the two-argument insert() overload instead. If you don't want
+    to overwrite, call contains() beforehand.
+
+    \oldcode
+        QMap<QString, int> map;
+        ...
+        map.insert("delay", 30000, false);
+    \newcode
+        QMap<QString, int> map;
+        ...
+        if (!map.contains("delay"))
+            map.insert("delay", 30000);
+    \endcode
+*/
+
+/*!
+    \fn iterator QMap::replace(const Key &key, const T &value)
+
+    Use remove() then insert().
+*/
+
+QT_END_NAMESPACE