f26a3b6ca9
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@955 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
83 lines
2.7 KiB
HTML
83 lines
2.7 KiB
HTML
<?xml version="1.0" encoding="iso-8859-1"?>
|
|
<?xml-stylesheet type="text/css" href="../../styles.css" ?>
|
|
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
|
|
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
|
|
|
|
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
|
|
|
|
<head>
|
|
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
|
|
<title>Logtalk built-in predicate: implements_protocol/2-3</title>
|
|
<link rel="stylesheet" href="../../styles.css" type="text/css" />
|
|
</head>
|
|
|
|
<body>
|
|
|
|
<div class="navtop">
|
|
<a href="../../index.html">contents</a> > <a href="../index.html">reference manual</a> > <a href="../index.html#builtins">built-in predicates</a>
|
|
</div>
|
|
|
|
<h2><code>implements_protocol/2-3</code></h2>
|
|
|
|
|
|
<h4>Description</h4>
|
|
|
|
<blockquote>
|
|
<pre>implements_protocol(Object, Protocol)
|
|
implements_protocol(Category, Protocol)
|
|
|
|
implements_protocol(Object, Protocol, Scope)
|
|
implements_protocol(Category, Protocol, Scope)</pre>
|
|
<p>
|
|
Enumerates, by backtracking, all pairs of entities such that an object or a category implements a protocol.
|
|
</p>
|
|
</blockquote>
|
|
|
|
<h4>Template and modes</h4>
|
|
|
|
<blockquote>
|
|
<pre>implements_protocol(?object_identifier, ?protocol_identifier)
|
|
implements_protocol(?category_identifier, ?protocol_identifier)
|
|
|
|
implements_protocol(?object_identifier, ?protocol_identifier, ?scope)
|
|
implements_protocol(?category_identifier, ?protocol_identifier, ?scope)</pre>
|
|
</blockquote>
|
|
|
|
<h4>Errors</h4>
|
|
|
|
<blockquote>
|
|
<dl>
|
|
<dt>Object is neither a variable nor a valid object identifier:</dt>
|
|
<dd><code>type_error(object_identifier, Object)</code></dd>
|
|
<dt>Category is neither a variable nor a valid category identifier:</dt>
|
|
<dd><code>type_error(category_identifier, Category)</code></dd>
|
|
<dt>Protocol is neither a variable nor a valid protocol identifier:</dt>
|
|
<dd><code>type_error(protocol_identifier, Protocol)</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>| ?- implements_protocol(List, listp).
|
|
|
|
| ?- implements_protocol(List, listp, public).</pre>
|
|
</blockquote>
|
|
|
|
<div class="navbottom">
|
|
<a href="extends_protocol2_3.html">previous</a> | <a href="../../glossary.html">glossary</a> | <a href="imports_category2_3.html">next</a>
|
|
</div>
|
|
|
|
<div class="copyright">
|
|
Copyright © <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> — <a href="http://www.logtalk.org">Logtalk.org</a>
|
|
</div>
|
|
|
|
<div class="footer">
|
|
<p><span class="bleft"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span><span class="bright">Last updated on: December 23, 2003</span></p>
|
|
</div>
|
|
</body>
|
|
</html>
|