PFMatch::EtaPhiSqSignificanceCalculator Node1 PFMatch::EtaPhiSqSignificance Calculator + EtaPhiSqSignificanceCalculator() + ~EtaPhiSqSignificanceCalculator() + distanceBetween() Node2 PFMatch::DistanceCalculator < EtaPhi, EtaPhiWithVariance > + ~DistanceCalculator() + distanceBetween() # DistanceCalculator() Node2->Node1