3455276aa2
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1487 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
114 lines
2.0 KiB
Plaintext
114 lines
2.0 KiB
Plaintext
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% general information about Joe:
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:- object(joePerson).
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:- public(getOlder/0).
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:- public(address/1).
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:- public(age/1).
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:- dynamic(age/1).
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:- public(name/1).
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:- public(phone/1).
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:- public(score/1).
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:- dynamic(score/1).
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:- public(setScore/1).
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getOlder :- % this predicate uses property sharing, i.e.
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retract(age(Old)), % the property and its value are shared by all
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New is Old + 1, % descendant prototypes/viewpoints; changes
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asserta(age(New)). % are shared no matter which viewpoint receives
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% the getOlder/1 message
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address('8 Octave Street').
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age(30).
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name('John').
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phone(11-11-11-11).
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score(0). % default value for the score/1 property,
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% shared by all descendant prototypes/viewpoints;
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setScore(Score) :- % changing the default value results in
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::retractall(score(_)), % in a local value stored in the descendant
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::asserta(score(Score)). % prototype that received the setScore/1 message
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:- end_object.
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% information on Joe as an employee:
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:- object(joeEmployee,
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extends(joePerson)).
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:- public(worksFor/1).
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:- public(salary/1).
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:- dynamic(salary/1).
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:- public(giveRaise/1).
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worksFor('ToonTown').
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salary(1500).
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giveRaise(Raise) :- % another example of property sharing
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retract(salary(Old)),
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New is Old + Raise,
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asserta(salary(New)).
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:- end_object.
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% information on Joe as an chess player:
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:- object(joeChessPlayer,
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extends(joePerson)).
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:- public(category/1).
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category('National Master').
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:- end_object.
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% information on Joe as a movies fan:
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:- object(joeFilmEnthusiast,
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extends(joePerson)).
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:- public(favActor/1).
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:- public(favFilm/1).
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:- public(favDirector/1).
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favActor('Fred Filistone').
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favFilm('The Wizard of Oz').
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favDirector('Krzystof Kieslowski').
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:- end_object.
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% information on Joe as a sportsman:
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:- object(joeSportsman,
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extends(joePerson)).
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:- public(sport/1).
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:- public(stamina/1).
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:- public(weight/1).
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sport(snowboard).
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stamina(30).
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weight(111).
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:- end_object.
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