75 lines
1.8 KiB
HTML
75 lines
1.8 KiB
HTML
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<!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>extends_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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<hr />
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<h2><code><a class="back" title="Return to index" href="../index.html#extends_protocol2_3">extends_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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extends_protocol(Protocol1, Protocol2)
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extends_protocol(Protocol1, Protocol2, Scope)
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</pre>
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<p>
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Enumerates, by backtracking, all pairs of protocols such that the first one extends the second.
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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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extends_protocol(?protocol_identifier, ?protocol_identifier)
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extends_protocol(?protocol_identifier, ?protocol_identifier, ?entity_scope)
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</pre>
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</blockquote>
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<h3>Errors</h3>
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<blockquote>
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<dl>
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<dt>Protocol1 is neither a variable nor a valid protocol identifier:</dt>
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<dd><code>type_error(protocol_identifier, Protocol1)</code></dd>
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<dt>Protocol2 is neither a variable nor a valid protocol identifier:</dt>
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<dd><code>type_error(protocol_identifier, Protocol2)</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(entity_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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| ?- extends_protocol(listp, Protocol).
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| ?- extends_protocol(Protocol, termp, private).
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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_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>
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</p>
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<p class="center">
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Last updated on: July 4, 2000
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</p>
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<hr />
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</body>
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</html>
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