MeasurementSelectorBase< NMeasMax, DIMMAX, derived_t >::PairWithFlags< T1, T2 > Node1 MeasurementSelectorBase < NMeasMax, DIMMAX, derived _t >::PairWithFlags< T1, T2 >   + operator=() + position() + covariance() + flags() Node2 std::tuple< T1, T2, unsigned int >     Node2->Node1