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<h2><code><a class="back" title="Return to index" href="../index.html#retractall1">retractall/1</a></code></h2>
<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>
retractall(+callable)
<h4>Errors</h4>
<dl>
<dt>Head is not a callable term:</dt>
<dd><code>type_error(callable, Head)</code></dd>
</dl>
<h4>Examples</h4>
| ?- retractall(foo(_)).
<p class="center">
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Last updated on: September 6, 2002
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