36a326908c
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1711 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
72 lines
2.8 KiB
HTML
72 lines
2.8 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 control construct: ::/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">Control construct: ::/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#constructs">control constructs</a></div>
|
|
|
|
<h2 class="codenp">::/1<span id="control_to_self1"/></h2>
|
|
|
|
|
|
<h4>Description</h4>
|
|
|
|
<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 within the scope of the object where the method making the call is defined, if 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>
|
|
|
|
<h4>Template and modes</h4>
|
|
|
|
<pre>::+messages</pre>
|
|
|
|
<h4>Errors</h4>
|
|
|
|
<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>
|
|
|
|
<h4>Examples</h4>
|
|
|
|
<pre>area(Area) :-
|
|
::width(Width),
|
|
::height(Height),
|
|
Area is Width*Height.</pre>
|
|
|
|
<div class="footer">
|
|
<div class="copyright">
|
|
<span>Copyright © <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> — <a href="http://logtalk.org">Logtalk.org</a></span><br/>
|
|
<span>Last updated on: October 26, 2006</span>
|
|
</div>
|
|
<div class="navbottom">
|
|
<span><a href="to_object2.html">previous</a> | <a href="../../glossary.html">glossary</a> | <a href="to_super1.html">next</a></span><br/>
|
|
<span><a href="http://validator.w3.org/check/referer">XHTML</a> + <a href="http://jigsaw.w3.org/css-validator/check/referer">CSS</a></span>
|
|
</div>
|
|
</div>
|
|
|
|
</body>
|
|
|
|
</html>
|