MuonValR4::RootVisualizationService::PlotsPerClient Node1 MuonValR4::RootVisualization Service::PlotsPerClient + elementsDrawn Node2 std::vector< PlotPtr_t > Node2->Node1 +toDraw Node3 std::shared_ptr< T > + operator->() Node3->Node2 +elements Node4 T Node4->Node3 +ptr