Hi Albert,

Hi,

I think that the visitors and the flags ideas of the MSM are very generic and easy to use. So, great!

But, there is a way to define multiple visitors for a single state (base)?

No.

I think that it is not possible because the visitors mechanism is based on a "simple/single typedef" and not on an "listed typedef"... isn't it? Yes.

So, why the visitors are not like flags? I mean, why not to use an "accept_sig_list" instead of a single "accept_sig"? Why is not possible a code like the following:

struct my_visitable_state { typedef mpl::vector< args, args > accept_sig_list;

void accept(VisitorType1&) const {} void accept(VisitorType2&) const {} };

It is possible. It has not been done because the interest in the visitor concept seems to have been (sadly) limited. This feature is dates a bit (about 3 years ago), and I got, if my memory is correct, exactly 2 questions about it (counting his one). This makes improvements get a low priority. Actually the concept could also do with a bit of redesign. For example args would look much better if defined as args. If you would like to help, I'm interested ;-)

By the way... I think that the usage of boost::ref() is not propagated to the submachines...? I've found that when my state machine is also in a submachine, the visitor of the state machine is passed by reference, but the submachine is passed always by value... is this a bug? (just using a pointer solved my needs, so just to report...) I just fixed it in trunk (rev. 77793). Thanks for the report.

Thanks,

Albert

Cheers, Christophe