A state containing orthogonal regions is a state containing one or more independent compound states.

To define a state machine with orthogonal regions you should defineorthogonal_regions type as atype_tuple in a state machine.transitions andinitial_state types will be ignored, the state machine will first pass the event to the contained regions (all of then than can handle the event), and then will checkinternal_transitions.

structortho_regions_def : ::afsm::def::state_machine<ortho_regions_def> {structregion_a : state_machine<region_a> {// Skip ...    };structregion_b : state<region_b> {};using orthogonal_regions = type_tuple< region_a, region_b >;};