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| <td class="back"><a id="top"></a><a href="s4.7.d.html" rel="prev"><< §4.7.(d) replace</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="s4.7.html" rel="section">§4.7 Callin binding with static methods</a></div> |
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| <h4 class="subsect">§4.7.(e) <span class="title">No overriding</span><a class="img" href="s4.7.e.html" title="PermaLink to (e) No overriding"><img style="vertical-align:text-top;margin-left:5px;" src="../images/permalink.png" |
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| <p>Since static methods are not dynamically bound, <i>overriding</i> does not |
| apply in the normal semantics. Regarding callin bindings this has the |
| following consequences (assuming a role <code>RMid</code> played by |
| <code>BMid</code> plus its super-class <code>BSuper</code> and its sub-class |
| <code>BSub</code>. |
| |
| </p> |
| <ol> |
| <li>If a static base method <code>BMid.m</code> is bound by a callin binding |
| this has no effect on any method <code>m</code> in <code>BSub</code>. |
| </li> |
| <li>If a callin binding mentions a method <code>m</code> which is not present |
| in <code>BMid</code> but resolves to a static method in <code>BSuper</code> |
| the binding only affects invocations as <code>BMid.m()</code> but not |
| <code>BSuper.m()</code>. If the latter call should be affected, too, |
| the callin binding must appear in a role class bound to <code>BSuper</code>, |
| not <code>BMid</code>. |
| </li> |
| <li>In order to bind two static base methods with equal signatures, one being |
| defined in a sub-class of the other one, two roles have to be defined |
| where one role refines the <code>playedBy</code> clause of the other role |
| (say: <code>public class RSub extends RMid playedBy BSub</code>). |
| Now each role may bind to the static base method accessible in its direct |
| base-class. |
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| <div class="breadcrumb"><a class="nav" href="s4.html" rel="section">§4 Callin Binding</a> > <a class="nav" href="s4.7.html" rel="section">§4.7 Callin binding with static methods</a></div> |
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| width="88" /></a><address>© Stephan Herrmann, Christine Hundt, Marco Mosconi</address> |
| OT/J version 1.3 — last modified: 2010-05-18 |
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