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68 lines
2.6 KiB
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68 lines
2.6 KiB
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<title>Logtalk built-in predicate: specializes_class/2-3</title>
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<div class="top-left">Logtalk reference manual</div>
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<div class="top-right">Built-in predicate: specializes_class/2-3</div>
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<div class="navtop"><a href="../../index.html">contents</a> > <a href="../index.html">reference manual</a> > <a href="../index.html#builtins">built-in predicates</a></div>
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<h2 id="builtins_specializes_class2_3" class="codenp">specializes_class/2-3</h2>
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<h4>Description</h4>
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<pre>specializes_class(Class, Superclass)
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specializes_class(Class, Superclass, Scope)</pre>
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<p>
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Enumerates, by backtracking, all pairs of objects such that the first one specializes the second. The relation scope is represented by the atoms <code>public</code>, <code>protected</code>, and <code>private</code>.
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</p>
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<h4>Template and modes</h4>
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<pre>specializes_class(?object_identifier, ?object_identifier)
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specializes_class(?object_identifier, ?object_identifier, ?scope)</pre>
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<h4>Errors</h4>
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<dl>
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<dt>Class is neither a variable nor a valid object identifier:</dt>
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<dd><code>type_error(object_identifier, Class)</code></dd>
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<dt>Superclass is neither a variable nor a valid object identifier:</dt>
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<dd><code>type_error(object_identifier, Superclass)</code></dd>
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<dt>Scope is neither a variable nor a valid entity scope:</dt>
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<dd><code>type_error(scope, Scope)</code></dd>
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</dl>
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<h4>Examples</h4>
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<pre>| ?- specializes_class(Subclass, state_space).
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| ?- specializes_class(Subclass, state_space, public).</pre>
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<span>Copyright © <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> — <a href="http://logtalk.org">Logtalk.org</a></span><br/>
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<span>Last updated on: October 26, 2006</span>
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