<?xml version="1.0" encoding="iso-8859-1"?> <?xml-stylesheet type="text/css" href="../../styles.css" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"> <head> <meta http-equiv="content-type" content="text/html; charset=iso-8859-1" /> <title>Logtalk predicate directive: mode/2</title> <link rel="stylesheet" href="../../styles.css" type="text/css" /> </head> <body> <div class="navtop"> <a href="../../index.html">contents</a> > <a href="../index.html">reference manual</a> > <a href="../index.html#directives">directives</a> </div> <h2><code>mode/2</code></h2> <h4>Description</h4> <blockquote> <pre>mode(Mode, Number_of_solutions)</pre> <p> Most predicates can be used with several instantiations modes. This directive enables the specification of each instantiation mode and the corresponding number of solutions/proofs. </p> </blockquote> <h4>Template and modes</h4> <blockquote> <pre>mode(+predicate_mode_term, +number_of_solutions)</pre> </blockquote> <h4>Examples</h4> <blockquote> <pre>:- mode(append(-, -, +), zero_or_more). :- mode(append(+list, +list, -list), zero_or_one). :- mode(var(@term), zero_or_one). :- mode(arg(-, -, +), error).</pre> </blockquote> <div class="navbottom"> <a href="metapredicate1.html">previous</a> | <a href="../../glossary.html">glossary</a> | <a href="op3.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="footer"> <p><span class="bleft"><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="bright">Last updated on: December 23, 2003</span></p> </div> </body> </html>