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Re: Issues subclassing NSMutableArray

From: mickbert
Subject: Re: Issues subclassing NSMutableArray
Date: Mon, 24 Feb 2020 12:08:19 +0100
User-agent: Posteo Webmail

On 24.02.2020 11:53, Wolfgang Lux wrote:

The trick here is that the alloc method in the NSMutableArray class
has a special case to allocate a GSMutableArray instance when called
on the NSMutableArray class, but not so for any subclass. So
[NSMutableArray alloc] returns a GSMutableArray instance, while
[MyMutableArray alloc] returns a MyMutableArray instance.

Now I understand better. I had a look to the sources, and what I found surprised me: in few places I found

    if (self == NSMutableArrayClass)

So it is specifically designed not to allow subclassing (which is meaningful, from some point of view).
Thanks for clarification.

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