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71 lines
2.8 KiB
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71 lines
2.8 KiB
HTML
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<title>Logtalk control construct: ::/1</title>
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<div class="top-left">Logtalk reference manual</div>
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<div class="top-right">Control construct: ::/1</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#constructs">control constructs</a></div>
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<h2 id="control_to_self1" class="codenp">::/1</h2>
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<h4>Description</h4>
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<pre>::Predicate
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::(Predicate1, Predicate2, ...)
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::(Predicate1; Predicate2; ...)</pre>
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<p>
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Send a message to <a class="glossary" title="Go to glossary definition" href="../../glossary.html#self">self</a>. Only used in the body of a predicate definition. The argument should match a public or protected predicate of <a class="glossary" title="Go to glossary definition" href="../../glossary.html#self">self</a>. It may also match a private predicate if the predicate is within the scope of the object where the method making the call is defined, if imported from a category, if used from inside a category, or when using private inheritance. We can also send a set of messages to self. The "<code>,</code>" and "<code>;</code>" in the list have the usual Prolog meaning.
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</p>
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<h4>Template and modes</h4>
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<pre>::+messages</pre>
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<h4>Errors</h4>
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<dl>
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<dt>Predicate is a variable:</dt>
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<dd><code>instantiation_error</code></dd>
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<dt>Predicate is declared private:</dt>
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<dd><code>permission_error(access, private_predicate, Predicate)</code></dd>
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<dt>Predicate is not declared:</dt>
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<dd><code>existence_error(predicate_declaration, Predicate)</code></dd>
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</dl>
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<h4>Examples</h4>
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<pre>area(Area) :-
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::width(Width),
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::height(Height),
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Area is Width*Height.</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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