Re: [Boost-users] [Statechart] casting event type in unconsumed_event

From: Andreas Huber (ahd6974-spamboostorgtrap_at_[hidden])
Date: 2007-04-07 13:52:12

Hi JD

[snip rest of code]
> struct MyMachine : sc::state_machine< MyMachine, Whatever >
> {
>   void unconsumed_event( const sc::event_base & evt )
>   {
>      // How can I display a message here with the event name?
>   }
> };

There are two options to do this:
1) Use C++ RTTI, i.e. type_info::name(). This is the easiest option as
it necessitates the least amount of work but of course requires that you
compile your program with C++ RTTI enabled.
2) Use event_base::custom_static_type_ptr

<http://www.boost-consulting.com/boost/libs/statechart/doc/reference.html#event_base::custom_dynamic_type_ptr>

and event_base::custom_dynamic_type_ptr

<http://www.boost-consulting.com/boost/libs/statechart/doc/reference.html#event::custom_static_type_ptr>

as demonstrated for states in

<http://www.boost-consulting.com/boost/libs/statechart/doc/tutorial.html#StateTypeInformation>.

This requires slightly more work than 1) but works even if you compile
your program with C++ RTTI disabled.

>   So the objective is to display the event name returned by the 'name'
> function when an event is unconsumed. I have tried some way like using
> dynamic_type and static_type but no luck...

See above, that should solve the event name problem quite nicely.

HTH,

-- 
Andreas Huber
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