8 

     9 typedef enum AircraftSubTypes {

    10 	AIR_HELICOPTER = 0,

    11 	AIR_AIRCRAFT   = 2,

    12 	AIR_SHADOW     = 4,

    13 	AIR_ROTOR      = 6

    14 } AircraftSubType;

    15 

    16 

    17 /** Check if the aircraft type is a normal flying device; eg

    18  * not a rotor or a shadow

    19  * @param v vehicle to check

    20  * @return Returns true if the aircraft is a helicopter/airplane and

    21  * false if it is a shadow or a rotor) */

    22 static inline bool IsNormalAircraft(const Vehicle *v)

    23 {

    24 	assert(v->type == VEH_Aircraft);

    25 	/* To be fully correct the commented out functionality is the proper one,

    26 	 * but since value can only be 0 or 2, it is sufficient to only check <= 2

    27 	 * return (v->subtype == AIR_HELICOPTER) || (v->subtype == AIR_AIRCRAFT); */

    28 	return v->subtype <= AIR_AIRCRAFT;

    29 }