informal_protocol.m

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

/* Contributed by Nicola Pero - Fri Mar  9 21:35:47 CET 2001 */
#include <objc/objc.h>
#include <objc/Object.h>

@interface Object (StopProtocol)
- (void) stop;
@end

int main (void)
{
  return 0;
}