Re: [Boost-users] [Statechart] Reusing states

From: Andreas Huber (ahd6974-spamboostorgtrap_at_[hidden])
Date: 2007-03-27 15:54:26

Hi Philippe

> I would like to reuse a state in statechart at different places of
> the state machine (so it can be a sub-state of at least 2 other
> states) or in different state
> machines. Since the state class has a template parameter with the
> context I am a bit stuck here. Have you done that yet or have an idea
> about how to do it ?

Make the state in question a template, example:

http://www.boost-consulting.com/boost/libs/statechart/doc/tutorial.html#SubmachinesAndParameterizedStates

Here the states On and Off are parametrized with an enum. You can of 
course parametrize them with just about anything, including their 
context. Templated states have a few gotchas though:

- 
http://www.boost-consulting.com/boost/libs/statechart/doc/faq.html#TemplatedStates
- All base class members become dependent names. You therefore need to 
prepend base member function calls with this-> and fully qualify base 
typedefs.

HTH,

-- 
Andreas Huber
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