(svn r21516) -Codechange: Add IsGroundVehicle function to the Vehicle class.

src/vehicle_base.h

@@ -359,6 +359,15 @@ public:
 		}
 	}
 
+	/**
+	 * Check if the vehicle is a ground vehicle.
+	 * @return True iff the vehicle is a train or a road vehicle.
+	 */
+	FORCEINLINE bool IsGroundVehicle() const
+	{
+		return this->type == VEH_TRAIN || this->type == VEH_ROAD;
+	}
+
 	/**
 	 * Gets the speed in km-ish/h that can be sent into SetDParam for string processing.
 	 * @return the vehicle's speed