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83 lines
2.8 KiB
HTML
83 lines
2.8 KiB
HTML
<?xml version="1.0" encoding="iso-8859-1"?>
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<?xml-stylesheet type="text/css" href="../../styles.css" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
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<head>
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<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
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<title>Logtalk built-in predicate: implements_protocol/2-3</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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<div class="navtop">
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<a href="../../index.html">contents</a> > <a href="../index.html">reference manual</a> > <a href="../index.html#builtins">built-in predicates</a>
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</div>
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<h2><code>implements_protocol/2-3</code></h2>
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<h4>Description</h4>
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<blockquote>
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<pre>implements_protocol(Object, Protocol)
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implements_protocol(Category, Protocol)
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implements_protocol(Object, Protocol, Scope)
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implements_protocol(Category, Protocol, Scope)</pre>
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<p>
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Enumerates, by backtracking, all pairs of entities such that an object or a category implements a protocol. The relation scope is represented by the atoms <code>public</code>, <code>protected</code>, and <code>private</code>.
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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>implements_protocol(?object_identifier, ?protocol_identifier)
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implements_protocol(?category_identifier, ?protocol_identifier)
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implements_protocol(?object_identifier, ?protocol_identifier, ?scope)
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implements_protocol(?category_identifier, ?protocol_identifier, ?scope)</pre>
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</blockquote>
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<h4>Errors</h4>
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<blockquote>
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<dl>
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<dt>Object is neither a variable nor a valid object identifier:</dt>
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<dd><code>type_error(object_identifier, Object)</code></dd>
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<dt>Category is neither a variable nor a valid category identifier:</dt>
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<dd><code>type_error(category_identifier, Category)</code></dd>
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<dt>Protocol is neither a variable nor a valid protocol identifier:</dt>
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<dd><code>type_error(protocol_identifier, Protocol)</code></dd>
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<dt>Scope is neither a variable nor a valid entity scope:</dt>
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<dd><code>type_error(scope, Scope)</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>| ?- implements_protocol(List, listp).
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| ?- implements_protocol(List, listp, public).</pre>
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</blockquote>
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<div class="navbottom">
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<a href="extends_protocol2_3.html">previous</a> | <a href="../../glossary.html">glossary</a> | <a href="imports_category2_3.html">next</a>
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</div>
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<div class="copyright">
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Copyright © <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> — <a href="http://www.logtalk.org">Logtalk.org</a>
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<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: August 5, 2005</span></p>
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