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git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@211 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
81 lines
2.1 KiB
HTML
81 lines
2.1 KiB
HTML
<!doctype html public "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<title>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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<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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<hr />
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<h4>Description</h4>
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<blockquote>
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<pre>
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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)
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</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.
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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>
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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)
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</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>
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| ?- implements_protocol(List, listp).
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| ?- implements_protocol(List, listp, public).
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</pre>
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</blockquote>
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<hr />
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<p class="center">
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<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>
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<p class="center">
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Last updated on: October 21, 2001
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</p>
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<hr />
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</body>
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</html>
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