Objective-C blocks as properties. Am I crazy?

Question

Is that possible?

Answer 1

Here's an example of how you would accomplish such a task:

#import <Foundation/Foundation.h>
typedef int (^IntBlock)();



@interface myobj : NSObject
{
    IntBlock compare;
}

@property(readwrite, copy) IntBlock compare;

@end

@implementation myobj

@synthesize compare;

@end
long dbltolongbits(double value)
{
    return *(((long*) &value));
}

int main () {
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    myobj *ob = [[myobj alloc] init];
    ob.compare = ^
    {
        return rand();
    };
    NSLog(@"%i", ob.compare());
    [ob release];
    [pool drain];
    return 0;
}

Now, the only thing that would need to change if you needed to change the type of compare would be the typedef int (^IntBlock)(). If you need to pass two objects to it, change it to this: typedef int (^IntBlock)(id, id), and change you block to:

^ (id obj1, id obj2)
{
    return rand();
};

I hope this helps.