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<td class="back"><a id="top"></a><a href="s3.1.a.html" rel="prev">&lt;&lt;&nbsp;&sect;3.1.(a)&nbsp;Prerequisite: Class binding</a></td>
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<td class="next"><a href="s3.1.c.html" rel="next">&sect;3.1.(c)&nbsp;Kinds of method designators&nbsp;&gt;&gt;</a></td>
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<div class="breadcrumb"><a class="nav" href="s3.html" rel="section">&sect;3&nbsp;Callout Binding</a>&nbsp;&gt;&nbsp;<a class="nav" href="s3.1.html" rel="section">&sect;3.1&nbsp;Callout method binding</a></div>
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<h4 class="subsect">&sect;3.1.(b)&nbsp;<span class="title">Definition</span><a class="img" href="s3.1.b.html" title="PermaLink to (b)&nbsp;Definition"><img style="vertical-align:text-top;margin-left:5px;" src="../images/permalink.png"
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<p>A callout binding maps an abstract role method ("expected method")
to a concrete base method ("provided method").
It may appear within the role class at any place where feature
declarations are allowed. It is denoted by
</p>
<div class="listing plain"><pre><i>expected_method_designator</i> <b>-&gt;</b> <i>provided_method_designator;</i></pre></div>
<p>The effect is that any call to the role method will be forwarded to the
associated base object using the provided base method.
</p>
<h5 class="listing">Example code (Callout):</h5>
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<td class="ln">1</td>
<td><pre><b>team</b> <b>class</b> Company {</pre></td>
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<td class="ln">2</td>
<td><pre> <b>public</b> <b>class</b> Employee <b>playedBy</b> Person {</pre></td>
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<td class="ln">3</td>
<td><pre> <b>abstract</b> String getIdentification();</pre></td>
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<td class="ln">4</td>
<td><pre> <span class="comment">// callout binding see below...</span></pre></td>
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<td class="ln">5</td>
<td><pre> }</pre></td>
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<td class="ln">6</td>
<td><pre>}</pre></td>
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<td class="back"><a href="s3.1.a.html" rel="prev">&lt;&lt;&nbsp;&sect;3.1.(a)&nbsp;Prerequisite: Class binding</a></td>
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<td class="next"><a href="s3.1.c.html" rel="next">&sect;3.1.(c)&nbsp;Kinds of method designators&nbsp;&gt;&gt;</a></td>
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<div class="breadcrumb"><a class="nav" href="s3.html" rel="section">&sect;3&nbsp;Callout Binding</a>&nbsp;&gt;&nbsp;<a class="nav" href="s3.1.html" rel="section">&sect;3.1&nbsp;Callout method binding</a></div>
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OT/J version 1.3 &mdash; last modified: 2010-10-05
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