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<title>Logtalk built-in method: predicate_property/2</title>
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<div class="top-left">Logtalk reference manual</div>
<div class="top-right">Built-in method: predicate_property/2</div>
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<h2 class="code">predicate_property/2</h2>
<h4>Description</h4>
<pre>predicate_property(Predicate, Property)</pre>
<p>
Enumerates, by backtracking, the properties of a visible predicate.
</p>
<h4>Template and modes</h4>
<pre>predicate_property(+callable, ?predicate_property)</pre>
<h4>Errors</h4>
<dl class="errors">
<dt>Predicate is a variable:</dt>
<dd><code>instantiation_error</code></dd>
<dt>Predicate is neither a variable nor a callable term:</dt>
<dd><code>type_error(callable, Predicate)</code></dd>
<dt>Property is neither a variable nor a valid predicate property:</dt>
<dd><code>domain_error(predicate_property, Property)</code></dd>
</dl>
<h4>Examples</h4>
<dl class="examples">
<dt>To enumerate, by backtracking, the properties of a predicate visible in <a class="glossary" title="Go to glossary definition" href="../../glossary.html#this">this</a>:</dt>
<dd><code>predicate_property(foo(_), Property)</code></dd>
<dt>To enumerate, by backtracking, the properties of a public or protected predicate visible in <a class="glossary" title="Go to glossary definition" href="../../glossary.html#self">self</a>:</dt>
<dd><code>::predicate_property(foo(_), Property)</code></dd>
<dt>To enumerate, by backtracking, the properties of a public predicate visible in an object:</dt>
<dd><code>Object::predicate_property(foo(_), Property)</code></dd>
</dl>
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<span class="date">Last updated on: November 16, 2005</span>
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