Subject: Re: Overriding -dealloc on any object



On Mar 25, 2009, at 7:29 AM, Ryan Joseph wrote:

The question is, will it be safe to override methods like initWithObjects: that are owned by Cocoa and created through convenience functions? Will those objects be sent -dealloc also? Second, given the Objective-C runtime should I replace the implementation using class_replaceMethod or do I need to add a new method using class_addMethod? I did observe that -dealloc does indeed have an implementation so I'm not sure class_addMethod will even have any affect, but I'm not sure replace the implementation is safe either. Any help is appreciated. Thanks!


I am not entirely certain I am following you but to work with Cocoa (in a non-GC environment) you will need to follow (and expect all Cocoa objects to follow) the Memory Management Guidelines. This document will tell you most, if not all, you need to know about memory management in Cocoa.

If you need to essentially override -dealloc that will be inherited by all objects, well, that's tricky, and requires some knowledge and use if Obj-C runtime functions. Beyond me. But then, do you really need that? I don't know what is involved in creating these "bridges", but it seems saner to me to maintain your own set of "manager" objects that then control native Cocoa objects.

HTH,

Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"

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