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| 1 | ================================================================ |
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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 | This folder contains an example of using a category to define a simple |
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| 15 | logging support for objects. This example illustrates how to define in |
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| 16 | a category a set of predicates that handle a dynamic predicate in the |
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| 17 | context of "this". Although the database built-in methods, such as |
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| 18 | assertz/1 or retractall/1, are straightforward to use, calling the |
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| 19 | dynamic predicate must be performed using the message sending ::/2 |
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| 20 | control construct (note that a direct call to the dynamic predicate |
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| 21 | would result in a compilation error as it would be interpreted as a |
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| 22 | call to a local category predicate: categories cannot contain clauses |
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| 23 | for dynamic predicates). |
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