Re: [Boost-users] Boost 1.49 msm problems with events

Subject: Re: [Boost-users] Boost 1.49 msm problems with events
From: Kamel Zaarouri, Mr (kamel.zaarouri_at_[hidden])
Date: 2012-07-10 16:35:13

Hi, I am having problems with my transition table and events. Let me explain the fake design that illustrates the problem:

I have a state machine (myStateMachine) containing 2 states (s0 and s1) and 1 substatemachine (subm1).

the substatemachine subm1 contains an initial state 'sub0' and also s1 (the same state as in myStateMachine).

this is the main transition table:

s0->s1 on event 'ES1'
s0->s2 on event 'ES2'
s0->subm1 on event 'ESUB'

this is the submachine transition table:

sub0->s1 on event ES1

now, assume that state s1 is using the event that triggered it to extract some information i.e.

struct s1 : public msm::front::state<>
{
   template <class Event,class FSM>
   void on_entry(Event const& evt,FSM& fsm)
   { 
      evt.getEventData();
   }
}
so every event that could transition to s1 needs to implement getEventData() method.

->this is normal!

now my problem is that ESUB does NOT implement getEventData() but apparently it should. And I don't get why.

I am not using ESUB to transition to s1 but I am using ESUB to transition to subm1 and subm1 contains s1 but I don't access it at that point.

I hope this is clear.

Thank you.