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<title>Logtalk built-in predicate: extends_object/2-3</title>
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<a href="../../index.html">contents</a> &gt; <a href="../index.html">reference manual</a> &gt; <a href="../index.html#builtins">built-in predicates</a>
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<h2><code>extends_object/2-3</code></h2>
<h4>Description</h4>
<blockquote>
<pre>extends_object(Prototype, Parent)
extends_object(Prototype, Parent, Scope)</pre>
<p>
Enumerates, by backtracking, all pairs of objects such that the first one extends the second.
</p>
</blockquote>
<h4>Template and modes</h4>
<blockquote>
<pre>extends_object(?object_identifier, ?object_identifier)
extends_object(?object_identifier, ?object_identifier, ?scope)</pre>
</blockquote>
<h4>Errors</h4>
<blockquote>
<dl>
<dt>Prototype is neither a variable nor a valid object identifier:</dt>
<dd><code>type_error(object_identifier, Prototype)</code></dd>
<dt>Parent is neither a variable nor a valid object identifier:</dt>
<dd><code>type_error(object_identifier, Parent)</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>| ?- extends_object(Object, state_space).
| ?- extends_object(Object, list, public).</pre>
</blockquote>
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