gistfile1.txt

@interface NSObject (MFB_KVCVisitorBlock)
@property (nonatomic, weak) void (^mfb_visitBlock)(id);
@end


@implementation NSObject (MFB_KVCVisitorBlock)

- (void (^)(id))mfb_visitBlock
{
    return nil;
}

- (void)setMfb_visitBlock:(void (^)(id))mfb_visitBlock
{
    mfb_visitBlock(self);
}

@end