yap-6.3/Logtalk/manuals/refman/control/to_self1.html

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<h2><code><a class="back" title="Return to index" href="../index.html#to_self1">::/1</a></code></h2>
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<h4>Description</h4>

<blockquote>
<pre>
::Predicate

::(Predicate1, Predicate2, ...)

::(Predicate1; Predicate2; ...)
</pre>
<p>
	Send a message to <a class="glossary" title="Go to glossary definition" href="../../glossary.html#self">self</a>. Only used in the body of a predicate definition. The argument should match a public or protected predicate of <a class="glossary" title="Go to glossary definition" href="../../glossary.html#self">self</a>. It may also match a private predicate if the predicate is imported from a category, if used from inside a category, or when using private inheritance. We can also send a set of messages to self. The "<CODE>,</CODE>" and "<CODE>;</CODE>" in the list have the usual Prolog meaning.
</p>
</blockquote>

<h4>Template and modes</h4>

<blockquote>
<pre>
::+messages
</pre>
</blockquote>

<h4>Errors</h4>

<blockquote>
	<dl>
		<dt>Predicate is a variable:</dt>
			<dd><code>instantiation_error</code></dd>
		<dt>Predicate is declared private:</dt>
			<dd><code>permission_error(access, private_predicate, Predicate)</code></dd>
		<dt>Predicate is not declared:</dt>
			<dd><code>existence_error(predicate_declaration, Predicate)</code></dd>
	</dl>
</blockquote>

<h4>Examples</h4>

<blockquote>
<pre>
area(Area) :-
    ::width(Width),
    ::height(Height),
    Area is Width*Height.
</pre>
</blockquote>

<hr />
<p class="center">
<strong><a href="to_object2.html">Previous</a> | <a href="to_super1.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"`
			`"http://www.w3.org/TR/html4/strict.dtd">`

			`<html>`

			`<head>`
			`<title>::/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#to_self1">::/1</a></code></h2>`
			`<hr />`

			`<h4>Description</h4>`

			`<blockquote>`
			`<pre>`
			`::Predicate`

			`::(Predicate1, Predicate2, ...)`

			`::(Predicate1; Predicate2; ...)`
			`</pre>`
			`<p>`
			Send a message to <a class="glossary" title="Go to glossary definition" href="../../glossary.html#self">self</a>. Only used in the body of a predicate definition. The argument should match a public or protected predicate of <a class="glossary" title="Go to glossary definition" href="../../glossary.html#self">self</a>. It may also match a private predicate if the predicate is imported from a category, if used from inside a category, or when using private inheritance. We can also send a set of messages to self. The "<CODE>,</CODE>" and "<CODE>;</CODE>" in the list have the usual Prolog meaning.
			`</p>`
			`</blockquote>`

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

			`<blockquote>`
			`<pre>`
			`::+messages`
			`</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>Predicate is a variable:</dt>`
			`<dd><code>instantiation_error</code></dd>`
			`<dt>Predicate is declared private:</dt>`
			`<dd><code>permission_error(access, private_predicate, Predicate)</code></dd>`
			`<dt>Predicate is not declared:</dt>`
			`<dd><code>existence_error(predicate_declaration, Predicate)</code></dd>`
			`</dl>`
			`</blockquote>`

			`<h4>Examples</h4>`

			`<blockquote>`
			`<pre>`
			`area(Area) :-`
			`::width(Width),`
			`::height(Height),`
			`Area is Width*Height.`
			`</pre>`
			`</blockquote>`

			`<hr />`
			`<p class="center">`
			`<strong><a href="to_object2.html">Previous</a> \| <a href="to_super1.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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