76 lines
2.0 KiB
HTML
76 lines
2.0 KiB
HTML
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<!doctype html public "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<title>::/1</title>
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<link rel=stylesheet href="../../styles.css" type="text/css">
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</head>
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<body>
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<hr />
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<h2><code><a class="back" title="Return to index" href="../index.html#to_self1">::/1</a></code></h2>
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<hr />
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<h4>Description</h4>
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<blockquote>
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<pre>
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::Predicate
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::(Predicate1, Predicate2, ...)
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::(Predicate1; Predicate2; ...)
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</pre>
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<p>
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Send a message to <a class="glossary" title="Go to glossary definition" href="../../glossary.html#self">self</a>. Only used in the body of a predicate definition. The argument should match a public or protected predicate of <a class="glossary" title="Go to glossary definition" href="../../glossary.html#self">self</a>. It may also match a private predicate if the predicate is imported from a category, if used from inside a category, or when using private inheritance. We can also send a set of messages to self. The "<CODE>,</CODE>" and "<CODE>;</CODE>" in the list have the usual Prolog meaning.
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</p>
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</blockquote>
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<h4>Template and modes</h4>
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<blockquote>
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<pre>
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::+messages
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</pre>
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</blockquote>
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<h3>Errors</h3>
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<blockquote>
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<dl>
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<dt>Predicate is a variable:</dt>
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<dd><code>instantiation_error</code></dd>
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<dt>Predicate is declared private:</dt>
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<dd><code>permission_error(access, private_predicate, Predicate)</code></dd>
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<dt>Predicate is not declared:</dt>
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<dd><code>existence_error(predicate_declaration, Predicate)</code></dd>
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</dl>
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</blockquote>
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<h4>Examples</h4>
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<blockquote>
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<pre>
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area(Area) :-
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::width(Width),
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::height(Height),
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Area is Width*Height.
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</pre>
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</blockquote>
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<hr />
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<p class="center">
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<strong><a href="to_object2.html">Previous</a> | <a href="to_super1.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
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</p>
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<p class="center">
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Last updated on: October 8, 2000
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</p>
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<hr />
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</body>
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</html>
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