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From: krubin@gitpyr.UUCP
Newsgroups: comp.lang.smalltalk
Subject: Smalltalk/V question
Message-ID: <3060@gitpyr.gatech.EDU>
Date: Sat, 7-Feb-87 17:59:49 EST
Article-I.D.: gitpyr.3060
Posted: Sat Feb  7 17:59:49 1987
Date-Received: Sun, 8-Feb-87 07:52:26 EST
Reply-To: krubin@gitpyr.UUCP (Kenny Rubin)
Distribution: world
Organization: Center for Man-Machine Systems Research,  Georgia Tech
Lines: 49
Keywords: Smalltalk/V


This is a question concerning the use of the Smalltalk/V
package put out by Digitalk.

QUESTION: how does one determine the names of instances that
	  have been created for a given class by application
	  of the 'new' method selector?

PROBLEM: when I make a modification to a given class, i.e., 
	 add/remove a new instance or class variable, I cannot
         save the modification (from the ClassHierarchyBrowser). 
         Attempting to do so results in a window popping up that
	 says "Has Instances". The solution to the problem seems 
	 to be to find all instances of the class (or subclass) 
	 and set them equal to something other than an object of 
	 the class I am trying to modify. Unfortunately, I can't 
	 seem to be able to locate the names, and more so, who
         is using them (containing the names).

MISC: I can offer the following information about the problem:
      1) In class Behavior there is a method names "allInstances"
	 According to the Programming Handbook, this returns an 
	 array of all the instances of the receiver. When I send
	 this selector to a class name, I get back an array of the
	 of classNames and not the instances names of the class.
	 form #(a className a className...). Thus I get an array
         of classNames rather than the names of the instances of
	 the class.
      2) I have used the inspect selector to examine the Smalltalk
	 systemDictionary. However, this does not provide the
	 information I need.
      3) So many other tests that I won't bother to list them.

I would sure appreciate any help on this issue. We are implementing
a fairly substantial modeling system (expert system) and problems
like this are killing our schedule.

Thanx in advance.

<---------------------------------------------------------------------->
                  Kenneth S. Rubin   (404) 894-2348
               Center for Man-Machine Systems Research
             School of Industrial and Systems Engineering
                   Georgia Institute of Technology
                        Post Office Box  35826
         	        Atlanta, Georgia 30332
       Majoring with: School of Information and Computer Science
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