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yap-6.3/Logtalk/manuals/refman/builtins/extends_protocol2_3.html
pmoura 18498c43d2 Logtalk 2.14.2 release files.
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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">
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<title>extends_protocol/2-3</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#extends_protocol2_3">extends_protocol/2-3</a></code></h2>
<hr />
<h4>Description</h4>
<blockquote>
<pre>
extends_protocol(Protocol1, Protocol2)
extends_protocol(Protocol1, Protocol2, Scope)
</pre>
<p>
Enumerates, by backtracking, all pairs of protocols such that the first one extends the second.
</p>
</blockquote>
<h4>Template and modes</h4>
<blockquote>
<pre>
extends_protocol(?protocol_identifier, ?protocol_identifier)
extends_protocol(?protocol_identifier, ?protocol_identifier, ?scope)
</pre>
</blockquote>
<h4>Errors</h4>
<blockquote>
<dl>
<dt>Protocol1 is neither a variable nor a valid protocol identifier:</dt>
<dd><code>type_error(protocol_identifier, Protocol1)</code></dd>
<dt>Protocol2 is neither a variable nor a valid protocol identifier:</dt>
<dd><code>type_error(protocol_identifier, Protocol2)</code></dd>
<dt>Scope is neither a variable nor a valid entity scope:</dt>
<dd><code>type_error(scope, Scope)</code></dd>
</dl>
</blockquote>
<h4>Examples</h4>
<blockquote>
<pre>
| ?- extends_protocol(listp, Protocol).
| ?- extends_protocol(Protocol, termp, private).
</pre>
</blockquote>
<hr />
<p class="center">
<strong><a href="extends_object2_3.html">Previous</a> | <a href="implements_protocol2_3.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: August 6, 2002
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