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Logtalk - Object oriented extension to Prolog
Release 2.29.4
Copyright (c) 1998-2007 Paulo Moura. All Rights Reserved.
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
