6b4bde14e1
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1903 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
63 lines
2.1 KiB
HTML
63 lines
2.1 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 id="control_external1" class="codenp">{}/1</h2>
|
|
|
|
<h4>Description</h4>
|
|
|
|
<pre>{Goal}</pre>
|
|
<p>
|
|
Calls external Prolog code. Can be used to bypass the Logtalk compiler. The argument is called within the context of the pseudo-object <em>user</em>.
|
|
</p>
|
|
|
|
<h4>Template and modes</h4>
|
|
|
|
<pre>{+callable}</pre>
|
|
|
|
<h4>Errors</h4>
|
|
|
|
<dl>
|
|
<dt>Goal is a variable:</dt>
|
|
<dd><code>instantiation_error</code></dd>
|
|
<dt>Goal is neither a variable nor a callable term:</dt>
|
|
<dd><code>type_error(callable, Goal)</code></dd>
|
|
</dl>
|
|
|
|
<h4>Examples</h4>
|
|
|
|
<pre>N1/D1 < N2/D2 :-
|
|
{N1*D2 < N2*D1}.</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: June 5, 2007</span>
|
|
</div>
|
|
<div class="navbottom">
|
|
<span><a href="../index.html#constructs">previous</a> | <a href="../../glossary.html">glossary</a> | <a href="../index.html#constructs">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>
|