[Boost-users] [MSM] Is there an elegant way to get the outermost FSM?

Subject: [Boost-users] [MSM] Is there an elegant way to get the outermost FSM?
From: Gábor Márton (gabor.marton_at_[hidden])
Date: 2011-08-30 07:41:15

Hi, 

I am having a statemachine with a submachine. In the internal submachine I need to check if there is a flag active in the outer statemachine.
Currently I solve this with a const pointer to the outermost FSM passed to the submachine's constructor:
        backEnd.set_states(msm::back::states_ <<
                        StOk(msm::back::states_ <<
                                        StSlave(&backEnd)));
StSlave is the internal submachine in which I need to check whether a flag in StOk is active or not.

Then I check the flag activity status e.g in a guard of StSlave like this:
        struct GrdBladeUp {
                template<class EVT, class FSM, class SourceState, class TargetState>
                bool operator()(EVT const& event, FSM& fsm, SourceState&, TargetState&) {
                        if(fsm.getOutermostFSM()->template is_flag_active<FlagBladeUp>()) {
                                return true;
                        }
                        return false;
                }
        };

Is there an easier way to get somehow the parent fsm or the outermost fsm of a submachine?

Thanks,
Gabor