On May 14, 2011, at 5:43 PM, Martin Batholdy wrote: > I still have trouble understanding the autorelease pool. > > Lets assume an object Z has a method where it gets a string y and returns > another string x. > > Now when an instance of this object is created and the method is invoked, > x is returned and is used somewhere else. > > Now this method of object Z should not be the owner of x right? > Because x is used elsewhere. > > > So I add x to the autorelease-pool to declare that I am not the owner (and > won't send it a release message); > > x = [[[NSString alloc] init] autorelease]; > > > but where do I release the pool? > And to which pool is it added?
Pay attention to the memory management rules: <http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/MemoryMgmt/Articles/mmRules.html> > I thought I would create my own pool in the init-method of Z and send it a > [pool release] message in the alloc-method. > > But I haven't seen that so far in sample code ... Don't ever do that. You'll wind up popping objects that aren't supposed to be popped yet, which will lead to a crash. Autorelease pools should never be used as ivars, globals, or static variables. In general, you shouldn't create your own autorelease pools, unless (1) you are using NSThread or pthread to create new threads, or (2) you have written a loop that generates a great deal of temporary objects that need to be popped from time to time to keep memory usage from spiking, and you know what you're doing. > can someone explain me what happens when I add x to the autorelease pool? Read the autorelease pools article in the memory management programming guide (see link above) and it will clear things up. Nick Zitzmann <http://www.chronosnet.com/> _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
