25 lines
426 B
Plaintext
25 lines
426 B
Plaintext
|
|
||
|
|
:- object(metric(_Town)).
|
||
|
|
|
||
|
|
|
||
|
|
:- info([
|
||
|
|
authors 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.
|