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yap-6.3/Logtalk/manuals/refman/builtins/implements_protocol2_3.html
pmoura b77427df89 Updated to Logtalk 2.9.1
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<title>implements_protocol/2-3</title>
<link rel=stylesheet href="../../styles.css" type="text/css">
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<h2><code><a class="back" title="Return to index" href="../index.html#implements_protocol2_3">implements_protocol/2-3</a></code></h2>
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<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>
<hr />
<p class="center">
<strong><a href="extends_protocol2_3.html">Previous</a> | <a href="imports_category2_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>
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<p class="center">
Last updated on: October 21, 2001
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