Path: utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!usc!wuarchive!uunet!mcsun!ukc!pyrltd!root44!praxis!gavin
From: gavin@praxis.co.uk (Gavin Finnie)
Newsgroups: comp.lang.objective-c
Subject: Re: AsciiFiler/Unknown class.
Message-ID: <5555@newton.praxis.co.uk>
Date: 4 Dec 90 10:26:31 GMT
References: <1990Nov22.215303.29686@ccs.carleton.ca>
Organization: Praxis, Bath, U.K.
Lines: 17

In article <1990Nov22.215303.29686@ccs.carleton.ca> greg@cygnus.sce.carleton.ca
(Greg Franks) writes:
>
>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.

I would be interested to see people's solutions to this general problem
(not just the specific question about the Unknown class), since it is a
potential headache when maintaining a large system written in Objective-C.

Gavin Finnie                             email:  gavin@praxis.co.uk
Praxis Systems plc                                       
20 Manvers Street                        phone: +44-225-444700
Bath BA1 1PX, England                    fax:   +44-225-465205 


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