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-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the documentation of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:FDL$
-** 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 The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Free Documentation License Usage
-** Alternatively, this file may be used under the terms of the GNU Free
-** Documentation License version 1.3 as published by the Free Software
-** Foundation and appearing in the file included in the packaging of
-** this file. Please review the following information to ensure
-** the GNU Free Documentation License version 1.3 requirements
-** will be met: https://www.gnu.org/licenses/fdl-1.3.html.
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-/*!
-    \example statemachine/pingpong
-    \title Ping Pong States Example
-
-    \brief The Ping Pong States example shows how to use parallel states together
-    with custom events and transitions in \l{The State Machine Framework}.
-
-    This example implements a statechart where two states communicate by
-    posting events to the state machine. The state chart looks as follows:
-
-    \image pingpong-example.png
-    \omit
-    \caption This is a caption
-    \endomit
-
-    The \c pinger and \c ponger states are parallel states, i.e. they are
-    entered simultaneously and will take transitions independently of
-    eachother.
-
-    The \c pinger state will post the first \c ping event upon entry; the \c
-    ponger state will respond by posting a \c pong event; this will cause the
-    \c pinger state to post a new \c ping event; and so on.
-
-    \snippet statemachine/pingpong/main.cpp 0
-
-    Two custom events are defined, \c PingEvent and \c PongEvent.
-
-    \snippet statemachine/pingpong/main.cpp 1
-
-    The \c Pinger class defines a state that posts a \c PingEvent to the state
-    machine when the state is entered.
-
-    \snippet statemachine/pingpong/main.cpp 2
-
-    The \c PingTransition class defines a transition that is triggered by
-    events of type \c PingEvent, and that posts a \c PongEvent (with a delay
-    of 500 milliseconds) to the state machine when the transition is
-    triggered.
-
-    \snippet statemachine/pingpong/main.cpp 3
-
-    The \c PongTransition class defines a transition that is triggered by
-    events of type \c PongEvent, and that posts a \c PingEvent (with a delay
-    of 500 milliseconds) to the state machine when the transition is
-    triggered.
-
-    \snippet statemachine/pingpong/main.cpp 4
-
-    The main() function begins by creating a state machine and a parallel
-    state group.
-
-    \snippet statemachine/pingpong/main.cpp 5
-
-    Next, the \c pinger and \c ponger states are created, with the parallel
-    state group as their parent state. Note that the transitions are \e
-    targetless. When such a transition is triggered, the source state won't be
-    exited and re-entered; only the transition's onTransition() function will
-    be called, and the state machine's configuration will remain the same,
-    which is precisely what we want in this case.
-
-    \snippet statemachine/pingpong/main.cpp 6
-
-    Finally, the group is added to the state machine, the machine is started,
-    and the application event loop is entered.
-
-  */