:- object(double).
:- info([
version is 1.0,
author is 'Paulo Moura',
date is 2004/2/16,
comment is 'Contains a simple table of facts for testing operator handling code.']).
:- public(double/2).
:- op(500, xfx, double). % local object operators, not visible outside this object
1 double 2.
2 double 4.
3 double 6.
:- end_object.
