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<title>Logtalk built-in predicate: implements_protocol/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>implements_protocol/2-3</code></h2>
<h4>Description</h4>
<blockquote>
<pre>implements_protocol(Object, Protocol)
implements_protocol(Category, Protocol)
implements_protocol(Object, Protocol, Scope)
implements_protocol(Category, Protocol, Scope)</pre>
<p>
Enumerates, by backtracking, all pairs of entities such that an object or a category implements a protocol.
</p>
</blockquote>
<h4>Template and modes</h4>
<blockquote>
<pre>implements_protocol(?object_identifier, ?protocol_identifier)
implements_protocol(?category_identifier, ?protocol_identifier)
implements_protocol(?object_identifier, ?protocol_identifier, ?scope)
implements_protocol(?category_identifier, ?protocol_identifier, ?scope)</pre>
</blockquote>
<h4>Errors</h4>
<blockquote>
<dl>
<dt>Object is neither a variable nor a valid object identifier:</dt>
<dd><code>type_error(object_identifier, Object)</code></dd>
<dt>Category is neither a variable nor a valid category identifier:</dt>
<dd><code>type_error(category_identifier, Category)</code></dd>
<dt>Protocol is neither a variable nor a valid protocol identifier:</dt>
<dd><code>type_error(protocol_identifier, Protocol)</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>| ?- implements_protocol(List, listp).
| ?- implements_protocol(List, listp, public).</pre>
</blockquote>
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Copyright &copy; <a href="mailto:pmoura@logtalk.org">Paulo Moura</a> &mdash; <a href="http://www.logtalk.org">Logtalk.org</a>
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