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<title>Logtalk built-in predicate: instantiates_class/2-3</title>
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<h2><code>instantiates_class/2-3</code></h2>
<h4>Description</h4>
<blockquote>
<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.
</p>
</blockquote>
<h4>Template and modes</h4>
<blockquote>
<pre>instantiates_class(?object_identifier, ?object_identifier)
instantiates_class(?object_identifier, ?object_identifier, ?scope)</pre>
</blockquote>
<h4>Errors</h4>
<blockquote>
<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(scope, Scope)</code></dd>
</dl>
</blockquote>
<h4>Examples</h4>
<blockquote>
<pre>| ?- instantiates_class(water_jug, state_space).
| ?- instantiates_class(Space, state_space, public).</pre>
</blockquote>
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