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<title>Logtalk built-in predicate: create_category/4</title>
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<div class="top-left">Logtalk reference manual</div>
<div class="top-right">Built-in predicate: create_category/4</div>
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<h2 class="code">create_category/4</h2>
<h4>Description</h4>
<pre>create_category(Identifier, Relations, Directives, Clauses)</pre>
<p>
Creates a new, dynamic, category.
</p>
<h4>Template and modes</h4>
<pre>create_category(+category_identifier, +list, +list, +list)</pre>
<h4>Errors</h4>
<dl class="errors">
<dt>One of the predicate arguments is a variable:</dt>
<dd><code>instantiation_error</code></dd>
<dt>Identifier is neither a variable nor 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 neither a variable nor a proper list:</dt>
<dd><code>type_error(list, Relations)</code></dd>
<dt>Directives is neither a variable nor a proper list:</dt>
<dd><code>type_error(list, Directives)</code></dd>
<dt>Clauses is neither a variable nor a proper list:</dt>
<dd><code>type_error(list, Clauses)</code></dd>
</dl>
<h4>Examples</h4>
<pre>| ?- create_category(foo, [implements(bar)], [], [bar(1), bar(2)]).</pre>
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<span class="date">Last updated on: January 21, 2006</span>
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