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yap-6.3/Logtalk/manuals/refman/methods/retractall1.html
pmoura b77427df89 Updated to Logtalk 2.9.1
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<title>retractall/1</title>
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<h2><code><a class="back" title="Return to index" href="../index.html#retractall1">retractall/1</a></code></h2>
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<h4>Description</h4>
<blockquote>
<pre>
retractall(Head)
</pre>
<p>
Retracts all matching predicates from an object. Note however that if the clauses for the dynamic predicate are contained in a category the predicate will fail.
</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>
<hr />
<p class="center">
<strong><a href="retract1.html">Previous</a> | <a href="bagof3.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: October 21, 2001
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