HepMCWeightSvc Node1 HepMCWeightSvc - m_metaDataTool - m_enabled - m_weights - m_nextWeight - m_eventInfoKey - m_mutex - NWEIGHTS + initialize() + setWeightNames() + weightNames() + weightNameVec() - getChanNum() - loadWeights() - getWeightIndex() Node2 extends< AthService, IHepMCWeightSvc > Node2->Node1