9fe4d26c59
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1539 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
76 lines
3.2 KiB
HTML
76 lines
3.2 KiB
HTML
<?xml version="1.0" encoding="utf-8"?>
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
|
|
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
|
|
|
|
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
|
|
|
|
<head>
|
|
<meta http-equiv="content-type" content="application/xml+xhtml; charset=utf-8" />
|
|
<title>Logtalk built-in method: asserta/1</title>
|
|
<link rel="stylesheet" href="../../screen.css" type="text/css" media="screen"/>
|
|
<link rel="stylesheet" href="../../print.css" type="text/css" media="print"/>
|
|
</head>
|
|
|
|
<body>
|
|
|
|
<div class="top-left">Logtalk reference manual</div>
|
|
<div class="top-right">Built-in method: asserta/1</div>
|
|
<div class="bottom-left"><span class="page"/></div>
|
|
<div class="bottom-right"><span class="page"/></div>
|
|
<div class="navtop"><a href="../../index.html">contents</a> > <a href="../index.html">reference manual</a> > <a href="../index.html#methods">built-in methods</a></div>
|
|
|
|
<h2 class="code">asserta/1</h2>
|
|
|
|
|
|
<h4>Description</h4>
|
|
|
|
<pre>asserta(Head)
|
|
asserta((Head:-Body))</pre>
|
|
<p>
|
|
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.
|
|
</p>
|
|
|
|
<h4>Template and modes</h4>
|
|
|
|
<pre>asserta(+clause)</pre>
|
|
|
|
<h4>Errors</h4>
|
|
|
|
<dl class="errors">
|
|
<dt>Head is a variable:</dt>
|
|
<dd><code>instantiation_error</code></dd>
|
|
<dt>Head is a neither a variable nor a callable term:</dt>
|
|
<dd><code>type_error(callable, Head)</code></dd>
|
|
<dt>Body cannot be converted to a goal:</dt>
|
|
<dd><code>type_error(callable, Body)</code></dd>
|
|
<dt>The predicate indicator of Head is that of a private predicate:</dt>
|
|
<dd><code>permission_error(modify, private_predicate, Head)</code></dd>
|
|
<dt>The predicate indicator of Head is that of a protected predicate:</dt>
|
|
<dd><code>permission_error(modify, protected_predicate, Head)</code></dd>
|
|
<dt>The predicate indicator of Head is that of a static predicate:</dt>
|
|
<dd><code>permission_error(modify, static_predicate, Head)</code></dd>
|
|
</dl>
|
|
|
|
<h4>Examples</h4>
|
|
|
|
<dl class="examples">
|
|
<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>
|
|
<dd><code>asserta(Clause)</code></dd>
|
|
<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>
|
|
<dd><code>::asserta(Clause)</code></dd>
|
|
<dt>To assert a clause as the first one for any public dynamic predicate in an object:</dt>
|
|
<dd><code>Object::asserta(Clause)</code></dd>
|
|
</dl>
|
|
|
|
<div class="footer">
|
|
<div class="navbottom"><a href="abolish1.html">previous</a> | <a href="../../glossary.html">glossary</a> | <a href="assertz1.html">next</a></div>
|
|
<div class="copyright">Copyright © <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> — <a href="http://www.logtalk.org">Logtalk.org</a></div>
|
|
<div class="footnote">
|
|
<span class="validators"><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span>
|
|
<span class="date">Last updated on: November 16, 2005</span>
|
|
</div>
|
|
</div>
|
|
|
|
</body>
|
|
</html>
|