One more and probably the strongest argument pro your pre-exit trick is that
it also works nicely with a transition originating at an outer state. E.g.
in the StopWatch state chart you want to do something special when a EvReset
event is received and the machine is currently in the Stopped state. You'd
then add a Stopped in-state reaction, which does what it has to do with
whatever Stopped data members and them simply calls forward_event(). The
event will then trigger the transition originating at the Active state.

This is cannot be done with the change you proposed.

Regards,

Andreas


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