ActsTrk::DetectorElementToActsGeometryIdMap Node1 ActsTrk::DetectorElement ToActsGeometryIdMap + makeValue() + getValue() Node2 std::unordered_map < ActsTrk::DetectorElement Key, Acts::GeometryIdentifier > Node2->Node1 Node3 K Node3->Node2 +keys Node4 T Node4->Node2 +elements