<!doctype html public "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <title>retractall/1</title> <link rel=stylesheet href="../../styles.css" type="text/css"> </head> <body> <hr /> <h2><code><a class="back" title="Return to index" href="../index.html#retractall1">retractall/1</a></code></h2> <hr /> <h4>Description</h4> <blockquote> <pre> retractall(Head) </pre> <p> Logtalk adds this built-in predicate, with the usual definition, to a Prolog compiler if it is not already defined. </p> </blockquote> <h4>Template and modes</h4> <blockquote> <pre> retractall(+callable) </pre> </blockquote> <h4>Errors</h4> <blockquote> <dl> <dt>Head is not a callable term:</dt> <dd><code>type_error(callable, Head)</code></dd> </dl> </blockquote> <h4>Examples</h4> <blockquote> <pre> | ?- retractall(foo(_)). </pre> </blockquote> <hr /> <p class="center"> <strong><a href="logtalk_version3.html">Previous</a> | <a href="../methods/parameter2.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong> </p> <p class="center"> Last updated on: February 9, 2002 </p> <hr /> </body> </html>