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<title>Logtalk built-in predicate: create_category/4</title>
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2005-12-24 18:00:21 +00:00
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<div class="top-left">Logtalk reference manual</div>
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<div class="top-right">Built-in predicate: create_category/4</div>
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<div class="bottom-left"><span class="page"/></div>
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<div class="bottom-right"><span class="page"/></div>
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<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>
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<h2 class="code">create_category/4</h2>
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<h4>Description</h4>
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<pre>create_category(Identifier, Relations, Directives, Clauses)</pre>
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<p>
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Creates a new, dynamic, category.
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</p>
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<h4>Template and modes</h4>
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<pre>create_category(+category_identifier, +list, +list, +list)</pre>
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2001-12-05 23:57:48 +00:00
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<h4>Errors</h4>
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<dl class="errors">
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<dt>One of the predicate arguments is a variable:</dt>
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<dd><code>instantiation_error</code></dd>
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<dt>Identifier is neither a variable nor a valid category identifier:</dt>
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<dd><code>type_error(category_identifier, Identifier)</code></dd>
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<dt>Identifier is already in use:</dt>
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<dd><code>permission_error(replace, category, Identifier)</code></dd>
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<dd><code>permission_error(replace, object, Identifier)</code></dd>
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<dd><code>permission_error(replace, protocol, Identifier)</code></dd>
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<dt>Relations is neither a variable nor a list:</dt>
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<dd><code>type_error(list, Relations)</code></dd>
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<dt>Directives is neither a variable nor a list:</dt>
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<dd><code>type_error(list, Directives)</code></dd>
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<dt>Clauses is neither a variable nor a list:</dt>
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<dd><code>type_error(list, Clauses)</code></dd>
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</dl>
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<h4>Examples</h4>
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<pre>| ?- create_category(foo, [implements(bar)], [], [bar(1), bar(2)]).</pre>
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<div class="footer">
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2005-12-24 18:00:21 +00:00
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<div class="navbottom"><a href="../index.html#builtins">previous</a> | <a href="../../glossary.html">glossary</a> | <a href="create_object4.html">next</a></div>
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<div class="copyright">Copyright © <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> — <a href="http://www.logtalk.org">Logtalk.org</a></div>
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<span class="date">Last updated on: November 16, 2005</span>
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