update

include/robot_costmap_2d/critical_layer.h

@@ -10,10 +10,6 @@ class CriticalLayer : public StaticLayer
 public:
   CriticalLayer();
   virtual ~CriticalLayer();
-  LayerType getType() const override
-  {
-      return LayerType::CRITICAL_LAYER;
-  }
 private:
   unsigned char interpretValue(unsigned char value) override;
   void updateCosts(robot_costmap_2d::Costmap2D& master_grid, int min_i, int min_j, int max_i, int max_j) override;