Re: What is "A class which must be subclassed" ?
Re: What is "A class which must be subclassed" ?
- Subject: Re: What is "A class which must be subclassed" ?
- From: Andrew Merenbach <email@hidden>
- Date: Sat, 18 Oct 2008 08:51:31 -0700
On Oct 18, 2008, at 7:43 AM, Jerry Krinock wrote:
I have written a class which is missing important behaviors that
must be provided by subclasses. I create one like this:
+ (id)fooWithBar:(Bar*)bar_ {
// A Bar instance knows which subclass of Foo is appropriate for
it.
// To find out, send it a -fooClass message.
id instance = [[[bar_ fooClass] alloc] init] ;
return [instance autorelease] ;
}
I'm trying to figure out what to call this. I read in "Cocoa Design
Patterns" [1] about Abstract Classes, but my Foo doesn't seem to be
quite an Abstract Class, since you could create one if you wanted to.
Is there a design pattern that I should be following for this
thing? Or maybe could/should I change it to ^be^ an Abstract
Class? Or maybe I should just leave it as is? Whatever it is, it
works fine for me.
Thanks,
Jerry
[1] http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaFundamentals/CocoaDesignPatterns/chapter_5_section_1.html#/
/apple_ref/doc/uid/TP40002974-CH6-SW6
Greetings, Jerry,
Might it be appropriate to use a @protocol here?
Cheers,
Andrew
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