Objective-C macro for switching on objects

gistfile1.m

@implementation NSObject (Extra)

- (BOOL)isEqualToAnyOf:(id)object, ...
{
  va_list args;
  va_start(args, object);
  for (id other = object; other != nil; other = va_arg(args, id)) {
    if ([self isEqual:other]) return YES;
  }
  va_end(args);

  return NO;
}

@end


#define SWITCH(object, ...) { \
  id ___switch_object = object; \
  BOOL ___switch_stop = NO; \
  do __VA_ARGS__ while(0); \
}

#define CASE(...) \
  if (___switch_stop) break; \
  if ([___switch_object isEqualToAnyOf:__VA_ARGS__, nil] && (___switch_stop = YES))

#define DEFAULT	\
  if (___switch_stop) break;


void Test(NSString *string) {
  SWITCH(string, {
    CASE(@"Great success") {
      // Switch cases auto-break so you don't have to
    }
    CASE(@"Returning from inside a case works just fine") {
      return; 
    }
    CASE(@"I", @"like", @"turtles") // Match on any of the passed
      // Single statements can be left without braces
      thatsCool();
    DEFAULT {
      NSLog(@"Default case reached");
    }
  });
}