Intead of ARC

scoperelease.txt

Instead of ARC:

Add scoperelease in addition to release and autorelease.

Think of it like scoped_ptr in C++ or more generally how deconstructors
get called for stack allocated objects (end of scope).

- (id)someMethod:(NSInteger)n {
    MyObject *o = [[[MyObject alloc] init] scoperelease]; 

    NSMutableString *s = [[[NSMutableString alloc] init] scoperelease];

    if (n < 0) {
        return nil;
        // compiler would insert [o release]; [s release];
    }

    /// do some work on s here

    return [NSNumber numberWithInteger:[s length]];
    // compiler would insert [o release]; [s release];
}

Other changes:
Properties have two more options: deallocable, viewUnloadable (yes, some
terse names would be nice here)

In the header we would have:
@property (nonatomic, retain, deallocable, viewUnloadable) UIButton *button;

And in the implementation file:
@synthesize button;

Because the property is deallocable the a [button release] will be 
inserted into the dealloc.

Because the property is viewUnloadable [button release]; button=nil 
will be inserted into the viewDidUnload of a UIViewController.