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Logtalk - Object oriented extension to Prolog
Release 2.26.2

Copyright (c) 1998-2005 Paulo Moura.  All Rights Reserved.
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To load this example and for sample queries, please see the SCRIPT file.

This folder contains an example that shows how to implement class variables 
as defined in Smalltalk. The name shared instance variables is however much
more accurate. In systems like Logtalk, which enables the use of explicit 
metaclasses, true class variables are just the class (as an object) own 
instance variables!

This example defines a root class (root) and three instances (instance1, 
instance2, and instance3). The root class defines a shared instance variable 
(using a dynamic predicate) and the setter and getter methods which implement 
the variable sharing behavior.