FPGATrackSimEventInputHeader Node1 FPGATrackSimEventInputHeader - m_event - m_optional - m_Hits + ~FPGATrackSimEventInputHeader() + newEvent() + setOptional() + reset() + event() + optional() + hits() + nHits() + addHit() + clearHits() + reserveHits() - ClassDef() Node2 TObject Node2->Node1