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| 2 | Logtalk - Open source object-oriented logic programming language |
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| 3 | Release 2.35.0 |
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| 4 | |
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| 5 | Copyright (c) 1998-2009 Paulo Moura. All Rights Reserved. |
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| 6 | Logtalk is free software. You can redistribute it and/or modify |
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| 7 | it under the terms of the "Artistic License 2.0" as published by |
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| 8 | The Perl Foundation. Consult the "LICENSE.txt" file for details. |
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| 9 | ================================================================ |
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| 10 | |
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| 11 | |
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| 12 | To load this example and for sample queries, please see the SCRIPT.txt file. |
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| 13 | |
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| 14 | Example adapted from the chapter "Classifying Prototype-Based Programming |
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| 15 | Languages" by Christophe Dony, Jacques Malenfant, and Daniel Bardou, found |
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| 16 | on the book "Prototype-Based Programming - Concepts, Languages, and |
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| 17 | Applications" published by Springer. |
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| 18 | |
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| 19 | |
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| 20 | This prototype programming example illustrates how we can do both property |
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| 21 | sharing and value sharing in Logtalk by calling the built-in predicate |
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| 22 | modification methods asserta/1, assertz/1, and retract/1 either in the |
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| 23 | context of "this" or in the context of "self". |
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| 24 | |
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| 25 | In this example we have a prototype, joePerson, containing general data on |
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| 26 | Joe such as its age, name, or address, and four descendant prototypes or |
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| 27 | viewpoints, joeSportsman, joeEmployee, joeChessPlayer, and joeFilmEnthusiast. |
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| 28 | Each descendant contains data related to a particular viewpoint about Joe. |
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