On Sat, Oct 18, 2008 at 10:43 AM, Jerry Krinock <[EMAIL PROTECTED]> 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.
The question is not *can* you create one (because in ObjC you can *always* create an instance of any class), the question is does it make *sense* to create one. If the answer is yes, then the behavior it's missing can't be *that* important. If the answer is no, then it's an abstract class. Mike _______________________________________________ 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 [EMAIL PROTECTED]