objc-assoc.m

#import <Foundation/Foundation.h>
#import <objc/runtime.h>

@interface ExtraData : NSObject
@end
@implementation ExtraData
- (void)dealloc;
{
	fprintf(stderr, "ExtraData %p deallocated\n", self);
	[super dealloc];
}
@end

int main(int argc, char *argv[])
{
	NSObject *owner = [[NSObject alloc] init];
	ExtraData *data = [[ExtraData alloc] init];
	
	static void *ExtraDataKey;
	
	objc_setAssociatedObject(owner, &ExtraDataKey, data, OBJC_ASSOCIATION_RETAIN);
	[data release];
	
	fprintf(stderr, "Releasing owner...\n");
	[owner release];
	
	return 0;
}