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yap-6.3/Logtalk/examples/lo/travellers/metric1.lgt
pmoura 75392e54c7 Logtalk 2.15.0 release files.
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@757 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
2003-02-05 00:15:28 +00:00

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:- object(metric(_Town)).
:- info([
author is 'Paulo Moura',
version is 1.0,
date is 2000/4/22,
comment is '.',
parnames is ['Town'],
source is 'Example adopted from the Francis G. McCabe L&O documentation.']).
:- public(less/2).
less((Town1, _), (Town2, _)):-
parameter(1, Town),
Town::crow_flies(Town1, Distance1),
Town::crow_flies(Town2, Distance2),
Distance1 < Distance2.
:- end_object.