Re: [boost] Boost::statechart: state reaction returned result

Subject: Re: [boost] Boost::statechart: state reaction returned result
From: Andreas Huber (ahd6974-spamboostorgtrap_at_[hidden])
Date: 2008-10-22 05:27:35

Hi 

> Could someone suggest me the recomended way of communicating error from fsm
> to the fsm user application?
> Assume state reaction unable to process event due to error and returns with
> discard_event(). As
> application calls process_event() to post an event which is of type "void". 
> How do I make sure that my event
> was processed successfuly and not discarded?

There's a facility designed for exactly this purpose:

<http://thread.gmane.org/gmane.comp.lib.boost.user/16894>
(see also documentation on unconsumed_event in the reference)

For your specific problem it's probably best to let the unconsumed_event 
function throw an exception instead of posting a special event.

Hope that works for you, if not please let me know.

Regards,

-- 
Andreas Huber
When replying by private email, please remove the words spam and trap
from the address shown in the header.