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<title>Logtalk built-in method: retractall/1</title>
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<h2><code>retractall/1</code></h2>
<h4>Description</h4>
<blockquote>
<pre>retractall(Head)</pre>
<p>
Retracts all matching predicates from an object.
</p>
</blockquote>
<h4>Template and modes</h4>
<blockquote>
<pre>retractall(+callable)</pre>
</blockquote>
<h4>Errors</h4>
<blockquote>
<dl>
<dt>Head is a variable:</dt>
<dd><code>instantiation_error</code></dd>
<dt>Head is neither a variable nor a callable term:</dt>
<dd><code>type_error(callable, Head)</code></dd>
<dt>The predicate indicator of Head is that of a private predicate:</dt>
<dd><code>permission_error(modify, private_predicate, Head)</code></dd>
<dt>The predicate indicator of Head is that of a protected predicate:</dt>
<dd><code>permission_error(modify, protected_predicate, Head)</code></dd>
<dt>The predicate indicator of Head is that of a static predicate:</dt>
<dd><code>permission_error(modify, static_predicate, Head)</code></dd>
<dt>The predicate indicator of Head is not declared:</dt>
<dd><code>existence_error(predicate_declaration, Head)</code></dd>
</dl>
</blockquote>
<h4>Examples</h4>
<blockquote>
<dl>
<dt>To retract all matching predicate definitions in <a class="glossary" title="Go to glossary definition" href="../../glossary.html#this">this</a>:</dt>
<dd><code>retractall(Head)</code></dd>
<dt>To retract all matching public or protected predicate definitions in <a class="glossary" title="Go to glossary definition" href="../../glossary.html#self">self</a>:</dt>
<dd><code>::retractall(Head)</code></dd>
<dt>To retract all matching public predicate definitions in an object:</dt>
<dd><code>Object::retractall(Head)</code></dd>
</dl>
</blockquote>
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