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<h2><code><a class="back" title="Return to index" href="../index.html#specializes_class2_3">specializes_class/2-3</a></code></h2>
<h4>Description</h4>
<blockquote>
<pre>
specializes_class(Class, Superclass)
specializes_class(Class, Superclass, Scope)
</pre>
<p>
Enumerates, by backtracking, all pairs of objects such that the first one specializes the second.
</p>
</blockquote>
<h4>Template and modes</h4>
specializes_class(?object_identifier, ?object_identifier)
specializes_class(?object_identifier, ?object_identifier, ?scope)
<h4>Errors</h4>
<dl>
<dt>Class is neither a variable nor a valid object identifier:</dt>
<dd><code>type_error(object_identifier, Class)</code></dd>
<dt>Superclass is neither a variable nor a valid object identifier:</dt>
<dd><code>type_error(object_identifier, Superclass)</code></dd>
<dt>Scope is neither a variable nor a valid entity scope:</dt>
<dd><code>type_error(scope, Scope)</code></dd>
</dl>
<h4>Examples</h4>
| ?- specializes_class(Subclass, state_space).
| ?- specializes_class(Subclass, state_space, public).
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Last updated on: October 21, 2001
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