Re: [Boost-users] [statechart] history in the different state hierarchies

Subject: Re: [Boost-users] [statechart] history in the different state hierarchies
From: Andreas Huber (ahd6974-spamboostorgtrap_at_[hidden])
Date: 2012-07-01 03:24:08

Hi

> I have a problem similar to the one described in the Statechart tutorial, 
but a 
> little different. My state machine has two states (let's call them A and B) 
in 
> the different state hierarchies and a third state C that can be transited to 
> from either A or B. The transition from C must be done to either A or B, 
> depending on where we came to C from.
> 
> So I've decided to use the history. The difference between this problem and 
> what's described in the tutorial is that A and B don't belong to the same 
> composite state (they only belong to the same state machine). I can't simply 
> declare "has_xxx_history" in the outer state like it's done in the tutorial.

If you want to transition to either state_A or state_B from state_C based on 
history, I'm afraid putting state_A and state_B in the same direct or indirect 
outer state is your only option. That's how history works.

In your example, it seems it would be possible to put state_A and state_B into 
a new outer state state_X and transition to state_X with deep history, no?

Regards,

-- 
Andreas Huber
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