<?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 built-in predicate: create_category/4</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#builtins">built-in predicates</a> </div> <h2><code>create_category/4</code></h2> <h4>Description</h4> <blockquote> <pre>create_category(Identifier, Relations, Directives, Clauses)</pre> <p> Creates a new, dynamic, category. </p> </blockquote> <h4>Template and modes</h4> <blockquote> <pre>create_category(+category_identifier, +list, +list, +list)</pre> </blockquote> <h4>Errors</h4> <blockquote> <dl> <dt>Identifier is a variable:</dt> <dd><code>instantiation_error</code></dd> <dt>Identifier is not a valid category identifier:</dt> <dd><code>type_error(category_identifier, Identifier)</code></dd> <dt>Identifier is already in use:</dt> <dd><code>permission_error(replace, category, Identifier)</code></dd> <dd><code>permission_error(replace, object, Identifier)</code></dd> <dd><code>permission_error(replace, protocol, Identifier)</code></dd> <dt>Relations is not a list:</dt> <dd><code>type_error(list, Relations)</code></dd> <dt>Directives is not a list:</dt> <dd><code>type_error(list, Directives)</code></dd> <dt>Clauses is not a list:</dt> <dd><code>type_error(list, Clauses)</code></dd> </dl> </blockquote> <h4>Examples</h4> <blockquote> <pre>| ?- create_category(foo, [implements(bar)], [], [bar(1), bar(2)]).</pre> </blockquote> <div class="navbottom"> <a href="protocol_property2.html">previous</a> | <a href="../../glossary.html">glossary</a> | <a href="create_object4.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>