MuonGMR4::TrapezoidBoundsExpander::TrapezoidPatch Node1 MuonGMR4::TrapezoidBounds Expander::TrapezoidPatch + toCenter + TrapezoidPatch() + print() + area() Node2 std::shared_ptr< const Acts::VolumeBounds > + ptr + operator->() Node2->Node1 +bounds