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| <td class="top"><a href="index.html" rel="contents">↑ Table of Contents ↑</a></td> |
| <td class="next"><a href="s4.8.b.html" rel="next">§4.8.(b) Qualified and unqualified names >></a></td> |
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| <div class="breadcrumb"><a class="nav" href="s4.html" rel="section">§4 Callin Binding</a> > <a class="nav" href="s4.8.html" rel="section">§4.8 Callin precedence</a></div> |
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| <h4 class="subsect">§4.8.(a) <span class="title">Precedence declaration</span><a class="img" href="s4.8.a.html" |
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| <p>A precedence declaration consists of the keyword <code>precedence</code> followed by |
| a list of names referring to callin bindings (see <a href="s4.1.e.html" title="§4.1.(e) Named callin binding" |
| class="sect">§4.1.(e)</a> for named callin bindings). |
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| <div class="listing plain"><pre><b>precedence</b> callinBinding1, callinBinding2;</pre></div> |
| <p> |
| A precedence declaration is only legal within a role or team class.<br /> |
| The order of elements in a precedence declaration determines their <strong>priority</strong> during dispatch, |
| similar to priorities based on activation of several team instances (<a href="s5.1.html" title="§5.1 Effect of team activation" |
| class="sect">§5.1</a>). |
| This means that <code>before</code> and <code>replace</code> binding with highest priority trigger first, |
| whereas <code>after</code> bindings with highest priority trigger last. |
| For binding precedences (as opposed to class based precedence, see <a href="s4.8.c.html" title="§4.8.(c) Class based precedence" |
| class="sect">§4.8.(c)</a> below) |
| which refer to <code>after</code> bindings, the precedence declaration must also use the <code>after</code> keyword |
| to remind the programmer that the execution order is inverse to the textual order. |
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| <div class="listing plain"><pre><b>precedence</b> <b>after</b> importantExecuteLast, lessImportantExecuteEarlier;</pre></div> |
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| width="88" /></a><address>© Stephan Herrmann, Christine Hundt, Marco Mosconi</address> |
| OT/J version 1.3 — last modified: 2011-05-12 |
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