Hiep update

include/robot_costmap_2d/preferred_layer.h

@@ -0,0 +1,18 @@
+#ifndef ROBOT_COSTMAP_2D_PREFERRED_LAYER_H_
+#define ROBOT_COSTMAP_2D_PREFERRED_LAYER_H_
+
+#include <robot_costmap_2d/static_layer.h>
+
+namespace robot_costmap_2d
+{
+class PreferredLayer : public StaticLayer
+{
+public:
+  PreferredLayer();
+  virtual ~PreferredLayer();
+private:
+  unsigned char interpretValue(unsigned char value);
+};
+}
+
+#endif // ROBOT_COSTMAP_2D_PREFERRED_LAYER_