gistfile1.m

void objc_setAssociatedObject ( id object, const void *key, id value, objc_AssociationPolicy policy );

// object = usually 'self'.  This is the object you want to associate a key and value with.  
// key = the key you want to associate the object with
// value = the value you want to associate with the key

// objc_AssociationPolicy is one of the below:
enum {
   OBJC_ASSOCIATION_ASSIGN  = 0,
   OBJC_ASSOCIATION_RETAIN_NONATOMIC  = 1,
   OBJC_ASSOCIATION_COPY_NONATOMIC  = 3,
   OBJC_ASSOCIATION_RETAIN  = 01401,
   OBJC_ASSOCIATION_COPY  = 01403
};


// Get the associated object
id objc_getAssociatedObject ( id object, const void *key );


// Remove all associated object references
void objc_removeAssociatedObjects ( id object );