Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!ux1.cso.uiuc.edu!ux1.cso.uiuc.edu!m.cs.uiuc.edu!shirley
From: shirley@m.cs.uiuc.edu
Newsgroups: comp.object
Subject: object type query
Message-ID: <77500017@m.cs.uiuc.edu>
Date: 30 Nov 89 17:36:38 GMT
Lines: 21
Nf-ID: #N:m.cs.uiuc.edu:77500017:000:500
Nf-From: m.cs.uiuc.edu!shirley    Nov 29 21:40:00 1989




I find myself with a C++ problem.  I have a list of pointers to
objects of type SUPER.  SUPER has subclasses SUBi, i = 1, 2, 3,...

I want to go through the list and extract the pointers that reference
objects of class SUB3 say.  To do this I either need a type function
or flag in the superclass which seems like a hack (especially if I don't
own SUPER).

Am I
	1) making a design mistake?
	2) missing a C++ technique?
	3) finding a problem with C++?


Thanks,

pete shirley
shirley@m.cs.uiuc.edu


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