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81 lines
2.7 KiB
HTML
81 lines
2.7 KiB
HTML
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<title>Logtalk control construct: ::/2</title>
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<div class="top-left">Logtalk reference manual</div>
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<div class="top-right">Control construct: ::/2</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_object2" class="codenp">::/2</h2>
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<h4>Description</h4>
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<pre>Object::Predicate
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(Object1, Object2, ...)::Predicate
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(Object1; Object2; ...)::Predicate
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Object::(Predicate1, Predicate2, ...)
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Object::(Predicate1; Predicate2; ...)</pre>
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<p>
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Sends a message to an object. The message argument must match a public predicate of the receiver object. We can also send the same message to a set of objects or a set of messages to the same object. 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>+receivers::+messages</pre>
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<h4>Errors</h4>
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<dl>
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<dt>Either Object or 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 declared protected:</dt>
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<dd><code>permission_error(access, protected_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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<dt>Object does not exist:</dt>
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<dd><code>existence_error(object, Object)</code></dd>
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</dl>
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<h4>Examples</h4>
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<pre>| ?- list::member(X, [1, 2, 3]).
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X = 1 ;
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X = 2 ;
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X = 3
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yes</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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