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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** 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, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, 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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\class QQueue
\brief The QQueue class is a generic container that provides a queue.
\ingroup tools
\ingroup shared
\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::swap(QQueue<T> &other)
\since 4.8
Swaps queue \a other with this queue. This operation is very
fast and never fails.
*/
/*!
\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()
*/
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