Path: utzoo!attcan!uunet!dalcs!aucs!831059l
From: 831059l@aucs.UUCP (Langlois)
Newsgroups: comp.lang.smalltalk
Subject: Duplication of instance variables in subclasses
Message-ID: <1397@aucs.UUCP>
Date: 26 Nov 88 19:24:34 GMT
Reply-To: 831059l@aucs.UUCP (Langlois)
Distribution: na
Organization: School of Computer Science, Acadia Univ., Nova Scotia
Lines: 20


	Is it possible to define a subclass that just adds some new methods
(and possibly some new instance variable of its own) to its superClass but 
does not duplicate the instance variables of the superClass so that the new
methods access the superClass variables and not the subClass's inheritance of 
the variable? My specific application is the development of a simulation 
system. If I define a class Simulation with an eventQueue and a current time
and want to define a subClass Entity (objects of a simulation) but I want 
Entity to access class Simulation's eventQueue and if possible, have no
eventQueue instance variable. Is my only option defining the two class as
subClasses of Object (or another class) so that instances of Entity don't
have an eventQueue.

Thanks for you time.


Steven Langlois     UUCP:     {uunet|watmath|utai|garfield}!dalcs!aucs!831059l
Acadia University   BITNET:   Steven@Acadia
Wolfville, NS       Internet: Steven%Acadia.BITNET@CUNYVM.CUNY.EDU
CANADA  B0P 1X0