HLT::MuonRoI Node1 HLT::MuonRoI + MuonRoI() Node2 HLT::HLTRoI< ROIB:: MuCTPIRoI > # m_lvl1RoI # m_thresholds # m_thresholdMask + HLTRoI() + lvl1RoI() + thresholds() + begin() + end() + size() + thresholdMask() # addThreshold() # setThresholdMask() Node2->Node1