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yap-6.3/Logtalk/manuals/refman/control/to_self1.html
pmoura b77427df89 Updated to Logtalk 2.9.1
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<!doctype html public "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>::/1</title>
<link rel=stylesheet href="../../styles.css" type="text/css">
</head>
<body>
<hr />
<h2><code><a class="back" title="Return to index" href="../index.html#to_self1">::/1</a></code></h2>
<hr />
<h4>Description</h4>
<blockquote>
<pre>
::Predicate
::(Predicate1, Predicate2, ...)
::(Predicate1; Predicate2; ...)
</pre>
<p>
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.
</p>
</blockquote>
<h4>Template and modes</h4>
<blockquote>
<pre>
::+messages
</pre>
</blockquote>
<h4>Errors</h4>
<blockquote>
<dl>
<dt>Predicate is a variable:</dt>
<dd><code>instantiation_error</code></dd>
<dt>Predicate is declared private:</dt>
<dd><code>permission_error(access, private_predicate, Predicate)</code></dd>
<dt>Predicate is not declared:</dt>
<dd><code>existence_error(predicate_declaration, Predicate)</code></dd>
</dl>
</blockquote>
<h4>Examples</h4>
<blockquote>
<pre>
area(Area) :-
::width(Width),
::height(Height),
Area is Width*Height.
</pre>
</blockquote>
<hr />
<p class="center">
<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>
</p>
<p class="center">
Last updated on: October 21, 2001
</p>
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</body>
</html>