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Re: Subclassing NSString?

From: Christian Edward Gruber
Subject: Re: Subclassing NSString?
Date: Tue, 2 Jan 2001 21:24:01 -0500

I would be very very careful about subclassing any Class which is the
interface to a Class Cluster.


----- Original Message -----
From: "Frederic" <address@hidden>
To: <address@hidden>
Sent: Monday, January 01, 2001 7:09 PM
Subject: Subclassing NSString?

> Hi,
> I need to create NSString which are unique in memory. (I actually need
> that for performance reasons).
> So I decided to subclass NSString and create a class method
> +(id)keyWithString:(NSString*)keyName which
> looks first in a hashtable to ensure it returns a singleton.
> But when invoking [[MyNSStringSubClass] alloc] initWithString:keyName],
> it fails saying:
> "subclass ASKey should override
> initWithCharactersNoCopy:length:freeWhenDone:"
> Is this really necessary and how should I do that?
> Thanks in advance,
> Frederic
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