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+/****************************************************************************
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+****************************************************************************/
+
+/*!
+    \example statemachine/factorial
+    \title Factorial States Example
+
+    The Factorial States example shows how to use \l{The State Machine
+    Framework} to calculate the factorial of an integer.
+
+    The statechart for calculating the factorial looks as follows:
+
+    \img factorial-example.png
+    \omit
+    \caption This is a caption
+    \endomit
+
+    In other words, the state machine calculates the factorial of 6 and prints
+    the result.
+
+    \snippet examples/statemachine/factorial/main.cpp 0
+
+    The Factorial class is used to hold the data of the computation, \c x and
+    \c fac. It also provides a signal that's emitted whenever the value of \c
+    x changes.
+
+    \snippet examples/statemachine/factorial/main.cpp 1
+
+    The FactorialLoopTransition class implements the guard (\c x > 1) and
+    calculations (\c fac = \c x * \c fac; \c x = \c x - 1) of the factorial
+    loop.
+
+    \snippet examples/statemachine/factorial/main.cpp 2
+
+    The FactorialDoneTransition class implements the guard (\c x <= 1) that
+    terminates the factorial computation. It also prints the final result to
+    standard output.
+
+    \snippet examples/statemachine/factorial/main.cpp 3
+
+    The application's main() function first creates the application object, a
+    Factorial object and a state machine.
+
+    \snippet examples/statemachine/factorial/main.cpp 4
+
+    The \c compute state is created, and the initial values of \c x and \c fac
+    are defined. A FactorialLoopTransition object is created and added to the
+    state.
+
+    \snippet examples/statemachine/factorial/main.cpp 5
+
+    A final state, \c done, is created, and a FactorialDoneTransition object
+    is created with \c done as its target state. The transition is then added
+    to the \c compute state.
+
+    \snippet examples/statemachine/factorial/main.cpp 6
+
+    The machine's initial state is set to be the \c compute state. We connect
+    the QStateMachine::finished() signal to the QCoreApplication::quit() slot,
+    so the application will quit when the state machine's work is
+    done. Finally, the state machine is started, and the application's event
+    loop is entered.
+
+ */