Re: [boost] [msm] eUML guard/action location

Subject: Re: [boost] [msm] eUML guard/action location
From: Michael Caisse (boost_at_[hidden])
Date: 2009-12-08 11:40:28

Stewart, Robert wrote:
> With whitespace, I agree that there's little difference between the two.
>
> Here's another suggestion, though it breaks from the logical UML ordering Michael posted previously:
>
>    DestState() = CurrentState() + cool_event()[guard()]/(action())
>
> This is in keeping with Spirit's syntax in that the guard/action expression is positioned like a semantic action.  It also reads better in C++ because we think in terms of evaluating the RHS and assigning the result to the LHS, and the RHS results in the state on the LHS in the above syntax.
>
>   

Rob -

I actually like this quite a bit.

  1. it keeps the event/guard/action with the source state
  2. the '=' read funny to me in the other. Here it actually
     reads "properly". RHS is evaluated and becomes LHS.

Nice suggestion.

michael

-- 
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Michael Caisse
Object Modeling Designs
www.objectmodelingdesigns.com