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76 lines
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<title>Logtalk built-in predicate: implements_protocol/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: implements_protocol/2-3</div>
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<div class="bottom-left"><span class="page"/></div>
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<div class="bottom-right"><span class="page"/></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_implements_protocol2_3" class="codenp">implements_protocol/2-3</h2>
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<h4>Description</h4>
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<pre>implements_protocol(Object, Protocol)
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implements_protocol(Category, Protocol)
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implements_protocol(Object, Protocol, Scope)
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implements_protocol(Category, Protocol, Scope)</pre>
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<p>
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Enumerates, by backtracking, all pairs of entities such that an object or a category implements a protocol. 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>implements_protocol(?object_identifier, ?protocol_identifier)
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implements_protocol(?category_identifier, ?protocol_identifier)
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implements_protocol(?object_identifier, ?protocol_identifier, ?scope)
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implements_protocol(?category_identifier, ?protocol_identifier, ?scope)</pre>
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<h4>Errors</h4>
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<dl>
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<dt>Object is neither a variable nor a valid object identifier:</dt>
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<dd><code>type_error(object_identifier, Object)</code></dd>
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<dt>Category is neither a variable nor a valid category identifier:</dt>
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<dd><code>type_error(category_identifier, Category)</code></dd>
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<dt>Protocol is neither a variable nor a valid protocol identifier:</dt>
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<dd><code>type_error(protocol_identifier, Protocol)</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>| ?- implements_protocol(List, listp).
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| ?- implements_protocol(List, listp, 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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<span><a href="extends_protocol2_3.html">previous</a> | <a href="../../glossary.html">glossary</a> | <a href="imports_category2_3.html">next</a></span><br/>
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