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| <td class="back"><a id="top"></a><a href="s2.3.2.d.html" rel="prev"><< §2.3.2.(d) Declared lifting for catch blocks</a></td> |
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| <div class="breadcrumb"><a class="nav" href="s2.html" rel="section">§2 Role Binding</a> > <a class="nav" href="s2.3.html" rel="section">§2.3 Lifting</a> > <a class="nav" href="s2.3.2.html" rel="section">§2.3.2 Declared lifting</a></div> |
| <div class="subsect depth4" id="s2.3.2.e"> |
| <h4 class="subsect">§2.3.2.(e) <span class="title">Generic declared lifting</span><a class="img" href="s2.3.2.e.html" |
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| <p>A method with declared lifting may introduce a type parameter that is bounded relative to a given role type. |
| Such bound is declared as: |
| |
| </p> |
| <div class="listing plain"><pre><AnyBase <b>base</b> SuperRole> |
| <b>void</b> teamMethod(AnyBase <b>as</b> SuperRole arg) { |
| <span class="comment">// body using arg as of type SuperRole</span> |
| }</pre></div> |
| <p>This means that <code>AnyBase</code> is a type parameter whose instantiations must all be liftable to role <code>SuperRole</code>. |
| |
| </p> |
| <p> |
| The given type bound requires the call site to supply an argument that is compatible to any base class |
| for which the current team contains a bound role that is a sub class of <code>SuperRole</code>, including <code>SuperRole</code> itself. |
| However, <code>SuperRole</code> itself need not be bound to any base class. |
| On the other hand, different valid substitutions for <code>AnyBase</code> need not be related by inheritance. |
| |
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| <div class="note"> |
| <h5>Note:</h5> |
| This feature supports generalized treatment of otherwise unrelated base classes. |
| This is done by defining one bound role for each base under consideration and by |
| having all these roles extend a common unbound role. |
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| <div class="breadcrumb"><a class="nav" href="s2.html" rel="section">§2 Role Binding</a> > <a class="nav" href="s2.3.html" rel="section">§2.3 Lifting</a> > <a class="nav" href="s2.3.2.html" rel="section">§2.3.2 Declared lifting</a></div> |
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| width="88" /></a><address>© Stephan Herrmann, Christine Hundt, Marco Mosconi</address> |
| OT/J version 1.3.1 — last modified: 2013-05-28 |
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