Re: [Boost-users] [statechart] using events for passing information

From: Andreas Huber (ahd6974-spamboostorgtrap_at_[hidden])
Date: 2007-08-16 13:30:42

Hi Christian

> I wonder if it is possible to use events for passing in data to
> states.

Yes, it is. You can define a transition action, which receives the 
triggering event as a parameter. Problem is, the UML standard mandates that 
the transition action is executed when all states of the origin state 
configuration have been left and before any of the states of the destination 
configuration are entered. Only the innermost common context or any of its 
contexts can therefore store the event data.

> I even cannot find some hints in the statechart
> documentation how to determine in some state which event caused a
> transistion to the this state!

There is a to-do item (no. 2) for this:

<http://www.boost.org/libs/statechart/doc/future_and_history.html#ToDoList>

Please let me know whether that would cover what you need.

Thanks,

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