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| <td class="back"><a id="top"></a><a href="s5.4.1.b.html" rel="prev"><< §5.4.1.(b) Method guards</a></td> |
| <td class="top"><a href="index.html" rel="contents">↑ Table of Contents ↑</a></td> |
| <td class="next"><a href="s5.4.1.d.html" rel="next">§5.4.1.(d) Team level guards >></a></td> |
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| <div class="breadcrumb"><a class="nav" href="s5.html" rel="section">§5 Team Activation</a> > <a class="nav" href="s5.4.html" rel="section">§5.4 Guard predicates</a> > <a class="nav" href="s5.4.1.html" rel="section">§5.4.1 Regular guards</a></div> |
| <div class="subsect depth4" id="s5.4.1.c"> |
| <h4 class="subsect">§5.4.1.(c) <span class="title">Role level guards</span><a class="img" href="s5.4.1.c.html" |
| title="PermaLink to (c) Role level guards"><img style="vertical-align:text-top;margin-left:5px;" src="../images/permalink.png" |
| alt="" /></a></h4> |
| <p>When a guard is specified at the role level, i.e., directly before the |
| class body of a role class, it applies to all callin method bindings of |
| the role class: |
| |
| </p> |
| <div class="listing plain"><pre><b>protected</b> <b>class</b> MyRole |
| <b>when</b> (value > MyTeam.this.threshold) |
| { |
| <b>int</b> value; |
| <i>other <b>class</b> body declarations</i> |
| }</pre></div> |
| <p>The following values are within the scope of the predicate expression: |
| |
| </p> |
| <ul> |
| <li>The role instance denoted by <code>this</code> (explicit or implicit, see above). |
| Thus, in the example <code>value</code> will be interpreted as a field of the enclosing role. |
| |
| </li> |
| <li>The team instance denoted by a qualified this reference as in <code>MyTeam.this</code></li> |
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| <div class="breadcrumb"><a class="nav" href="s5.html" rel="section">§5 Team Activation</a> > <a class="nav" href="s5.4.html" rel="section">§5.4 Guard predicates</a> > <a class="nav" href="s5.4.1.html" rel="section">§5.4.1 Regular guards</a></div> |
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| width="88" /></a><address>© Stephan Herrmann, Christine Hundt, Marco Mosconi</address> |
| OT/J version 1.3 — last modified: 2011-05-15 |
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