Re: [Boost-users] [statechart] transition exception

Subject: Re: [Boost-users] [statechart] transition exception
From: Andreas Huber (ahd6974-spamboostorgtrap_at_[hidden])
Date: 2010-05-16 15:52:23

Hi Christophe

Sorry for the late answer.

> Is it possible to transit<> back to the source state when an exception is
> thrown by the handler of a transition ? Pls, note that the handler of the
> transition can be used by several transitions in the state diagram.
>
> The state machine, being in a transition, is between two stable states.
> The exception can be handled by the innermost common outer state (or 
> anyone
> above). In an handler of this state, is it possible to force transit<> to
> the source state of the transition that throws the exception ? Or is it
> possible to manage it differently ?

Yes, in the exception event handler, transition to an error state, which 
posts an event (say EvGoBack) in its entry action. The error state has a 
transition triggered by EvGoBack to deep history. For this to work, all 
possible source states must be direct or indirect inner states of a common 
outer state and the transition to history would specify a direct inner state 
of the common outer state as the default. Also, the error state must not be 
an inner state of the common outer state.

HTH,

-- 
Andreas Huber
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