Method entryGuard

test/wiki_tutorial.cpp:60–63

    : FSM::State
{
    void entryGuard(FullControl& control) {                    // called before state activation, use to re-route transitions
        if (control.context().powerOn)                         // access shared data
            control.changeTo<On>();                            // initiate a transition into 'On' region
    }

    void exit(PlanControl& /*control*/) {}                     // called on state deactivation
};