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78 lines
2.7 KiB
HTML
78 lines
2.7 KiB
HTML
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<head>
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<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
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<title>Logtalk built-in method: predicate_property/2</title>
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<link rel="stylesheet" href="../../styles.css" type="text/css" />
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</head>
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<body>
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<div class="navtop">
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<a href="../../index.html">contents</a> > <a href="../index.html">reference manual</a> > <a href="../index.html#methods">built-in methods</a>
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</div>
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<h2><code>predicate_property/2</code></h2>
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<h4>Description</h4>
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<blockquote>
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<pre>predicate_property(Predicate, Property)</pre>
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<p>
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Enumerates, by backtracking, the properties of a visible predicate.
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</p>
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</blockquote>
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<h4>Template and modes</h4>
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<blockquote>
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<pre>predicate_property(+callable, ?predicate_property)</pre>
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</blockquote>
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<h4>Errors</h4>
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<blockquote>
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<dl>
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<dt>Predicate is a variable:</dt>
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<dd><code>instantiation_error</code></dd>
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<dt>Predicate is neither a variable nor a callable term:</dt>
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<dd><code>type_error(callable, Predicate)</code></dd>
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<dt>Property is neither a variable nor a valid predicate property:</dt>
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<dd><code>domain_error(predicate_property, Property)</code></dd>
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</dl>
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</blockquote>
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<h4>Examples</h4>
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<blockquote>
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<dl>
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<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>
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<dd><code>predicate_property(foo(_), Property)</code></dd>
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<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>
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<dd><code>::predicate_property(foo(_), Property)</code></dd>
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<dt>To enumerate, by backtracking, the properties of a public predicate visible in an object:</dt>
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<dd><code>Object::predicate_property(foo(_), Property)</code></dd>
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</dl>
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</blockquote>
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<div class="navbottom">
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<a href="current_predicate1.html">previous</a> | <a href="../../glossary.html">glossary</a> | <a href="abolish1.html">next</a>
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<div class="copyright">
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Copyright © <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> — <a href="http://www.logtalk.org">Logtalk.org</a>
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