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| <td class="back"><a id="top"></a><a href="s2.3.2.c.html" rel="prev"><< §2.3.2.(c) Declared lifting of arrays</a></td> |
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| <td class="next"><a href="s2.3.2.e.html" rel="next">§2.3.2.(e) Generic declared lifting >></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.d"> |
| <h4 class="subsect">§2.3.2.(d) <span class="title">Declared lifting for catch blocks</span><a class="img" href="s2.3.2.d.html" |
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| <p>Also the argument of a catch block may apply declared lifting like in: |
| |
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| <div class="listing plain"><pre><b>catch</b> (BaseException <b>as</b> RoleClass param) { <i>stmts</i> }</pre></div> |
| <p>This syntax is only valid in a non-static scope of a team (directly or nested). |
| In the given example, <code>RoleClass</code> must be played by <code>BaseException</code>. |
| Note, that <code>RoleClass</code> itself need not be a throwable. |
| As the effect of this declaration the catch block will catch any exception of type <code>BaseException</code> |
| and provides it wrapped with a <code>RoleClass</code> instance to the subsequent block. |
| <br /> |
| Also note, that re-throwing the given instance <code>param</code> has the semantics of implicitly lowering |
| the role to its base exception before throwing, because the role conforms to the required type |
| <code>Throwable</code> only via lowering. |
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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 — last modified: 2011-05-15 |
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