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Logtalk - Object oriented extension to Prolog
Release 2.21.1

Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
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% start by loading the example:

| ?- logtalk_load(loader).
...


% check the object square(_) public protocol:

| ?- square(_)::current_predicate(Predicate).

Predicate = side/1 ;
Predicate = width/1 ;
Predicate = height/1 ;
Predicate = area/1
yes


% test the side/1 alias:

| ?- square(2)::side(Side).

Side = 2 
yes


% check the object circle(_) public protocol:

| ?- circle(_)::current_predicate(Predicate).

Predicate = r/1 ;
Predicate = rx/1 ;
Predicate = ry/1 ;
Predicate = area/1
yes


% test the r/1 alias:

| ?- circle(3)::r(Radius).

Radius = 3 
yes