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Logtalk - Object oriented extension to Prolog
Release 2.28.2

Copyright (c) 1998-2006 Paulo Moura.  All Rights Reserved.
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To load this example and for sample queries, please see the SCRIPT file.

This example shows the use of meta-predicates in Logtalk. Meta-predicates are 
predicates whose head contains arguments that will be called as goals in the 
body of the predicate definition.

This example defines two objects:

	sort(_)
		this is a parametric object containing a method that implements the
		quicksort sorting algorithm; the parameter is interpreted as the type
		of the elements being sorted
	
	tracer
		this object implements a meta-predicate that is used by sort(_) to 
		trace the sorting algorithm steps