template CreateStateTransitorPolicy(State_, Event_, State_ defaultStateParameter_ = State_.init, ProcHandler_ = void delegate()[], ExceptionHandler_ = void delegate(Exception)[], EventHandler_ = void delegate(Event_)[], StateChangedHandler_ = void delegate(State_ newSts, State_ oldSts)[], ConsumeMode consumeMode_ = ConsumeMode.combined, EventContainer_ = SList!Event_)
alias StateChangedHandler =
StateChangedHandler_