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| <td class="back"><a id="top"></a><a href="s2.4.1.b.html" rel="prev"><< §2.4.1.(b) Fresh base object</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="s2.4.html" rel="section">§2.4 Explicit role creation</a> > <a class="nav" href="s2.4.1.html" rel="section">§2.4.1 Role creation via a lifting constructor</a></div> |
| <div class="subsect depth4" id="s2.4.1.c"> |
| <h4 class="subsect">§2.4.1.(c) <span class="title">Duplicate role runtime check</span><a class="img" href="s2.4.1.c.html" |
| title="PermaLink to (c) Duplicate role runtime check"><img style="vertical-align:text-top;margin-left:5px;" src="../images/permalink.png" |
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| <p>If it cannot be syntactically derived, that the argument to a lifting |
| constructor is a freshly created base object (b), a compile time warning will |
| signal that an additional runtime check is needed: It must be prevented that |
| a new role is created for a base object, which already has a role of the |
| required type in the given team. It is not possible to replace an existing |
| role by use of the lifting constructor. At runtime, any attempt to do so |
| will cause a <code>org.objectteams.DuplicateRoleException</code> to be thrown. |
| This exception can only occur in situations where the mentioned compile |
| time warning had been issued. |
| <br /><a href="s6.1.html" title="§6.1 Reflection" class="sect">§6.1</a> will introduce reflective functions |
| which can be used to manually prevent errors like a duplicate role. |
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| <td class="back"><a href="s2.4.1.b.html" rel="prev"><< §2.4.1.(b) Fresh base object</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="s2.4.html" rel="section">§2.4 Explicit role creation</a> > <a class="nav" href="s2.4.1.html" rel="section">§2.4.1 Role creation via a lifting constructor</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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