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85 lines
3.0 KiB
HTML
85 lines
3.0 KiB
HTML
<?xml version="1.0" encoding="iso-8859-1"?>
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<?xml-stylesheet type="text/css" href="../../styles.css" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
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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: asserta/1</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>asserta/1</code></h2>
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<h4>Description</h4>
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<blockquote>
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<pre>asserta(Head)
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asserta((Head:-Body))</pre>
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<p>
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Asserts a clause as the first one for an object's dynamic predicate. If the predicate is not already declared, then a dynamic predicate declaration is added to the object.
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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>asserta(+clause)</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>Head is a variable:</dt>
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<dd><code>instantiation_error</code></dd>
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<dt>Head is a neither a variable nor a callable term:</dt>
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<dd><code>type_error(callable, Head)</code></dd>
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<dt>Body cannot be converted to a goal:</dt>
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<dd><code>type_error(callable, Body)</code></dd>
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<dt>The predicate indicator of Head is that of a private predicate:</dt>
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<dd><code>permission_error(modify, private_predicate, Head)</code></dd>
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<dt>The predicate indicator of Head is that of a protected predicate:</dt>
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<dd><code>permission_error(modify, protected_predicate, Head)</code></dd>
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<dt>The predicate indicator of Head is that of a static predicate:</dt>
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<dd><code>permission_error(modify, static_predicate, Head)</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 assert a clause as the first one for any dynamic predicate in <a class="glossary" title="Go to glossary definition" href="../../glossary.html#this">this</a>:</dt>
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<dd><code>asserta(Clause)</code></dd>
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<dt>To assert a clause as the first one for any public or protected dynamic predicate in <a class="glossary" title="Go to glossary definition" href="../../glossary.html#self">self</a>:</dt>
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<dd><code>::asserta(Clause)</code></dd>
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<dt>To assert a clause as the first one for any public dynamic predicate in an object:</dt>
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<dd><code>Object::asserta(Clause)</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="abolish1.html">previous</a> | <a href="../../glossary.html">glossary</a> | <a href="assertz1.html">next</a>
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</div>
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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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<div class="footer">
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