Add commonly used INVALID constants, taken from here:
#define INVALID_SKIN_ID -1
#define INVALID_MODEL_ID -1
#define INVALID_CHECKPOINT_ID -1
#define INVALID_MAPICON_ID -1
#define INVALID_PICKUP_ID -1
#define INVALID_AREA_ID -1
#define INVALID_TIMER_ID -1
#define INVALID_VIRTUAL_WORLD_ID -1
#define INVALID_INTERIOR_ID -1
#define INVALID_CLASS_ID -1
#define INVALID_PAINTJOB_ID -1
#define INVALID_VEHICLE_COLOR_ID -2
#define INVALID_WEAPON_ID -1
There might be others I haven't thought of.
Add commonly used INVALID constants, taken from here:
There might be others I haven't thought of.