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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 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 qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+ \class QQueue
+ \brief The QQueue class is a generic container that provides a queue.
+
+ \ingroup tools
+ \ingroup shared
+ \mainclass
+ \reentrant
+
+ QQueue\<T\> is one of Qt's generic \l{container classes}. It
+ implements a queue data structure for items of a same type.
+
+ A queue is a first in, first out (FIFO) structure. Items are
+ added to the tail of the queue using enqueue() and retrieved from
+ the head using dequeue(). The head() function provides access to
+ the head item without removing it.
+
+ Example:
+ \snippet doc/src/snippets/code/src_corelib_tools_qqueue.cpp 0
+
+ The example will output 1, 2, 3 in that order.
+
+ QQueue inherits from QList. All of QList's functionality also
+ applies to QQueue. For example, you can use isEmpty() to test
+ whether the queue is empty, and you can traverse a QQueue using
+ QList's iterator classes (for example, QListIterator). But in
+ addition, QQueue provides three convenience functions that make
+ it easy to implement FIFO semantics: enqueue(), dequeue(), and
+ head().
+
+ QQueue's value type must be an \l{assignable data type}. This
+ covers most data types that are commonly used, but the compiler
+ won't let you, for example, store a QWidget as a value. Use
+ QWidget* instead.
+
+ \sa QList, QStack
+*/
+
+/*!
+ \fn QQueue::QQueue()
+
+ Constructs an empty queue.
+*/
+
+/*!
+ \fn QQueue::~QQueue()
+
+ Destroys the queue. References to the values in the queue, and all
+ iterators over this queue, become invalid.
+*/
+
+/*!
+ \fn void QQueue::enqueue(const T& t)
+
+ Adds value \a t to the tail of the queue.
+
+ This is the same as QList::append().
+
+ \sa dequeue(), head()
+*/
+
+/*!
+ \fn T &QQueue::head()
+
+ Returns a reference to the queue's head item. This function
+ assumes that the queue isn't empty.
+
+ This is the same as QList::first().
+
+ \sa dequeue(), enqueue(), isEmpty()
+*/
+
+/*!
+ \fn const T &QQueue::head() const
+
+ \overload
+*/
+
+/*!
+ \fn T QQueue::dequeue()
+
+ Removes the head item in the queue and returns it. This function
+ assumes that the queue isn't empty.
+
+ This is the same as QList::takeFirst().
+
+ \sa head(), enqueue(), isEmpty()
+*/