yap-6.3/Logtalk/manuals/refman/methods/asserta1.html

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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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<h4>Description</h4>

<blockquote>
<pre>
asserta(Clause)
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>
</blockquote>

<h4>Template and modes</h4>

<blockquote>
<pre>
asserta(+clause)
</pre>
</blockquote>

<h4>Errors</h4>

<blockquote>
	<dl>
		<dt>Clause is a variable:</dt>
			<dd><code>instantiation_error</code></dd>
		<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>
</blockquote>

<h4>Examples</h4>

<blockquote>
	<dl>
		<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>
</blockquote>

<hr />
<p class="center">
<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 class="center">
Last updated on: October 21, 2001
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Logtalk files git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@55 b08c6af1-5177-4d33-ba66-4b1c6b8b522a 2001-06-06 21:07:01 +01:00			`<!doctype html public "-//W3C//DTD HTML 4.01//EN"`
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			`<head>`
			`<title>asserta/1</title>`
			`<link rel=stylesheet href="../../styles.css" type="text/css">`
			`</head>`

			`<body>`

			`<hr />`
			`<h2><code><a class="back" title="Return to index" href="../index.html#asserta1">asserta/1</a></code></h2>`
			`<hr />`

			`<h4>Description</h4>`

			`<blockquote>`
			`<pre>`
			`asserta(Clause)`
			`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>`
			`</blockquote>`

			`<h4>Template and modes</h4>`

			`<blockquote>`
			`<pre>`
			`asserta(+clause)`
			`</pre>`
			`</blockquote>`

Updated to Logtalk 2.9.1 git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@211 b08c6af1-5177-4d33-ba66-4b1c6b8b522a 2001-12-05 23:57:48 +00:00			`<h4>Errors</h4>`
Logtalk files git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@55 b08c6af1-5177-4d33-ba66-4b1c6b8b522a 2001-06-06 21:07:01 +01:00
			`<blockquote>`
			`<dl>`
			`<dt>Clause is a variable:</dt>`
			`<dd><code>instantiation_error</code></dd>`
			`<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>`
			`</blockquote>`

			`<h4>Examples</h4>`

			`<blockquote>`
			`<dl>`
			`<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>`
			`</blockquote>`

			`<hr />`
			`<p class="center">`
			`<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>`
			`</p>`
			`<p class="center">`
Updated to Logtalk 2.9.1 git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@211 b08c6af1-5177-4d33-ba66-4b1c6b8b522a 2001-12-05 23:57:48 +00:00			`Last updated on: October 21, 2001`
Logtalk files git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@55 b08c6af1-5177-4d33-ba66-4b1c6b8b522a 2001-06-06 21:07:01 +01:00			`</p>`
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