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Logtalk - Object oriented extension to Prolog
Release 2.9.1

Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
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% instance1 definition for method "method" is found in its class:

| ?- instance1::method.

This is the default definition for the method, stored in class root.

yes


% instance2 overrides definition of method "method"

| ?- instance2::method.

This is an overriding definition stored in the instance2 instance itself.

yes


% instance3 specializes definition of method "method"

| ?- instance3::method.

This is a specializing definition stored in the instance3 instance itself.
It makes a super call to execute the default definition:

This is the default definition for the method, stored in class root.

yes