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abstract class

Subject: abstract class
From: Daniel Child <email@hidden>
Date: Thu, 24 May 2007 11:44:30 -0400

Hi All,

I have seen Apple's documentation on "class clusters" as their way of implementing the abstract factory pattern. What I don't understand is precisely how (using Obj-C) you declare a class to be abstract and set up the interface so that calls to the interface get routed to the subclass.

I have just started studying this stuff and must be missing something obvious, but even the gnu documentation mentions abstract classes without giving an example. Could anyone show the briefest example of how it works in Obj-C? Thanks in advance.

Daniel
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