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61 lines
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<title>Logtalk built-in predicate: retractall/1</title>
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<div class="top-left">Logtalk reference manual</div>
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<div class="top-right">Built-in predicate: retractall/1</div>
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<div class="navtop"><a href="../../index.html">contents</a> > <a href="../index.html">reference manual</a> > <a href="../index.html#builtins">built-in predicates</a></div>
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<h2 class="codenp">retractall/1<span id="builtins_retractall1"/></h2>
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<h4>Description</h4>
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<pre>retractall(Head)</pre>
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<p>
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Logtalk adds this built-in predicate, with the usual definition, to a Prolog compiler if it is not already defined.
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</p>
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<h4>Template and modes</h4>
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<pre>retractall(+callable)</pre>
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<h4>Errors</h4>
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<dl>
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<dt>Head is not a callable term:</dt>
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<dd><code>type_error(callable, Head)</code></dd>
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</dl>
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<h4>Examples</h4>
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<pre>| ?- retractall(foo(_)).</pre>
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<span>Copyright © <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> — <a href="http://logtalk.org">Logtalk.org</a></span><br/>
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<span>Last updated on: October 26, 2006</span>
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