Re: [Boost-users] [msm] Two identical orthogonal regions?

Subject: Re: [Boost-users] [msm] Two identical orthogonal regions?
From: Aurelian Melinte (ame01_at_[hidden])
Date: 2012-05-25 09:43:36

On 24/05/2012 4:23 PM, Christophe Henry wrote:
>> Hi,
>>
>> I am trying to put two identical orthogonal regions in a state 
>> machine (each region would model a "channel" and I can have multiple 
>> such channels).
>>
>> One way I can think of is duplicating the states through typedefs and 
>> duplicating entries in the transition table.
>>
>> Is there a way to avoid this duplication?
>>
>> Regards,
>> a.
>
>
> Hi,
>
> for MSM they just need to be different types. You can define structs 
> inheriting from base states, you can templatize them with an int 
> parameter, you can even define a submachine which you inherit from and 
> paste 2 instances, one in each region.
>
> Though I didn't try it since the times of MSM v1, something like the 
> following should work (assuming Functor Front-end):
>
> struct SubFront : msm::front_state_machine_def<SubFront>{...};
> typedef msm::back::state_machine<SubFront> SubHelper;
>
> template <int index>
> struct Sub: public SubHelper{};
>
> // Outer machine
> // we have only the submachines in the regions so that it is easier to 
> duplicate
> typedef mpl::vector<Sub<0>, Sub<1> > initial_state;
> // excerpt from transition table
> Row<Sub<0>,...>,
> Row<Sub<1>,...>
>
> HTH,
> Christophe
>

Thank you very much, it worked fine!
Regards,
a.