boost msm, how can I determine if a transition occurred?

Question

When I fire process_event("eventname"), How can I check if the state transition occurred or if no_transition was called?

Basically, I would like that the class that fires/calls process_event("eventname") be able to tell if the transition occurred. Currently I can't determine this.

Any ideas?

Thank you

Answer 1

The return value of process_event is:

typedef enum
{
    HANDLED_FALSE=0,
    HANDLED_TRUE =1,
    HANDLED_GUARD_REJECT=2,
    HANDLED_DEFERRED=4
} HandledEnum;

What you want is probably all except HANDLED_FALSE, which comes with no_transition.