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<h2><code><a class="back" title="Return to index" href="../index.html#instantiates_class2_3">instantiates_class/2-3</a></code></h2>
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<h4>Description</h4>
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<pre>
instantiates_class(Instance, Class)
instantiates_class(Instance, Class, Scope)
</pre>
<p>
Enumerates, by backtracking, all pairs of objects such that the first one instantiates the second.
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<h4>Template and modes</h4>
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instantiates_class(?object_identifier, ?object_identifier)
instantiates_class(?object_identifier, ?object_identifier, ?entity_scope)
</pre>
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<h3>Errors</h3>
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<dl>
<dt>Instance is neither a variable nor a valid object identifier:</dt>
<dd><code>type_error(object_identifier, Instance)</code></dd>
<dt>Class is neither a variable nor a valid object identifier:</dt>
<dd><code>type_error(object_identifier, Class)</code></dd>
<dt>Scope is neither a variable nor a valid entity scope:</dt>
<dd><code>type_error(entity_scope, Scope)</code></dd>
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<h4>Examples</h4>
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<pre>
| ?- instantiates_class(water_jug, state_space).
| ?- instantiates_class(Space, state_space, public).
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Last updated on: July 4, 2000
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