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From: ras@stpstn.UUCP (Richard A. Strilowich)
Newsgroups: comp.lang.objective-c
Subject: Re:AsciiFiler/Unknown class
Message-ID: <5868@stpstn.UUCP>
Date: 28 Nov 90 21:21:19 GMT
Reply-To: ras@stepstone.com.UUCP (Richard A. Strilowich)
Organization: The Stepstone Corporation, Sandy Hook, CT 06482
Lines: 27

Greg Franks@carleton posted:

|  Greetings.  We have an evolving application that adds new classes,
|  changes existing classes and disposes of old classes.  Adding new
|  classes is no problem.  We have a solution to the dreaded 'change
|  instance variable of a class and try to read in old versions problem'
|  that works for us so changing classes is no problem.  However, we have
|  now tried to dispose of a class.  No problem... Just link in 'Unknown'
|  and the old references will be read in and blown away.  Surprise
|  surprise.  The code for handling 'Unknown' in Filer.m has been
|  commented out.  Furthermore, the interface to Unknown has changed so
|  even if we compiled it back in it would still bomb.  Sooo, we have
|  left the old class linked in.  Question: Has anyone successfully used
|  Unknown??  If so, can they share the method for getting it work.
|  Enquiring minds want to know!

|  We are running objc 4.0.

We are working on a solution but this will not make it into our new
Objective-C 4.3 release.  When we have a solution we will issue a posting
on the net telling everyone how to get the fix.  Sorry for any
inconvenience this may have cause anyone.
-- 
The Stepstone Corporation                    Richard Strilowich
75 Glen Rd.                                  ras@stepstone.com
Sandy Hook, CT 06482                         uunet!stpstn!ras
(203) 426-1875    fax (203)270-0106