b77427df89
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@211 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
83 lines
2.5 KiB
HTML
83 lines
2.5 KiB
HTML
<!doctype html public "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<title>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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<hr />
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<h2><code><a class="back" title="Return to index" href="../index.html#asserta1">asserta/1</a></code></h2>
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<hr />
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<h4>Description</h4>
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<blockquote>
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<pre>
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asserta(Clause)
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asserta((Head:-Body))
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</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>
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asserta(+clause)
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</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>Clause is a variable:</dt>
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<dd><code>instantiation_error</code></dd>
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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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<hr />
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<p class="center">
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<strong><a href="abolish1.html">Previous</a> | <a href="assertz1.html">Next</a> | <a href="../index.html">Table of Contents</a> | <a href="../../bibliography.html">Bibliography</a> | <a href="../../glossary.html">Glossary</a></strong>
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</p>
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<p class="center">
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Last updated on: October 21, 2001
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</p>
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<hr />
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</body>
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</html>
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