Re: [Boost-users] [statechart] orthogonal states in state_machine?

From: Andreas Huber (ahd6974-spamboostorgtrap_at_[hidden])
Date: 2007-08-13 17:56:49

Hi Chris

> I would like to create a state_machine class that contains some
> context
> information that can be written by orthogonal<0> and read by
> orthogonal<1>.
> Graphically:
>  _______________
> | State Machine |
> |_______________|______________
> |                               |
> |    StateA1 <------> StateA2   |
> |  - - - - - - - - - - - - - -  |
> |    StateB1 <------> StateB2   |
> |_______________________________|
>
> I declare using
>
> struct StateA1, StateB1;
> struct MyStateMachine : sc::state_machine< MyStateMachine,
> mpl::list<StateA1, StateB1> > {};

The InitialState parameter of the state_machine class template cannot be an 
mpl::list<>. Please see

<http://www.boost.org/libs/statechart/doc/reference.html#ClassTemplatestate_machine>

as opposed to

<http://www.boost.org/libs/statechart/doc/reference.html#ClassTemplatesimple_state>

> struct StateA1 : sc::simple_state<StateA1,
> MyStateMachine::orthogonal<0> >
> {};
>
> but get a compile error on line 2 as "orthogonal not a member of
> MyStateMachine".  Do I need to declare one state in MyStateMachine,
> and make
> the mpl::list a second template argument to it in order to get what
> I want?

Yes, only a state can contain orthogonal regions.

HTH,

-- 
Andreas Huber
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