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<?xml version="1.0" encoding="iso-8859-1"?>
<?xml-stylesheet type="text/css" href="../../styles.css" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<title>::/2</title>
<link rel="stylesheet" href="../../styles.css" type="text/css">
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<body>
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<h2><code><a class="back" title="Return to index" href="../index.html#to_object2">::/2</a></code></h2>
<hr />
<h4>Description</h4>
<blockquote>
<pre>
Object::Predicate
(Object1, Object2, ...)::Predicate
(Object1; Object2; ...)::Predicate
Object::(Predicate1, Predicate2, ...)
Object::(Predicate1; Predicate2; ...)
</pre>
<p>
Sends a message to an object. The message argument must match a public predicate of the receiver object. We can also send the same message to a set of objects or a set of messages to the same object. The "<CODE>,</CODE>" and "<CODE>;</CODE>" in the list have the usual Prolog meaning.
</p>
</blockquote>
<h4>Template and modes</h4>
<blockquote>
<pre>
+receivers::+messages
</pre>
</blockquote>
<h4>Errors</h4>
<blockquote>
<dl>
<dt>Either Object or 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 declared protected:</dt>
<dd><code>permission_error(access, protected_predicate, Predicate)</code></dd>
<dt>Predicate is not declared:</dt>
<dd><code>existence_error(predicate_declaration, Predicate)</code></dd>
<dt>Object does not exist:</dt>
<dd><code>existence_error(object, Object)</code></dd>
</dl>
</blockquote>
<h4>Examples</h4>
<blockquote>
<pre>
| ?- list::member(X, [1, 2, 3]).
</pre>
</blockquote>
<hr />
<p class="center">
<strong><a href="../methods/after3.html">Previous</a> | <a href="to_self1.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: July 29, 2002
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