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<title>Logtalk predicate directive: protocol/1-2</title>
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<h2><code>protocol/1-2</code></h2>
<h4>Description</h4>
<blockquote>
<pre>protocol(Protocol)
protocol(Protocol,
extends(Protocols))</pre>
<p>
Starting protocol directive.
</p>
</blockquote>
<h4>Template and modes</h4>
<pre>protocol(+protocol_identifier)
protocol(+protocol_identifier,
extends(+extended_protocols))</pre>
<h4>Examples</h4>
<pre>:- protocol(listp).
:- protocol(listp,
extends(compoundp)).
:- protocol(queuep,
extends(protected::listp)).</pre>
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