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| <td class="back"><a id="top"></a><a href="s2.3.5.c.html" rel="prev"><< §2.3.5.(c) Problematic callin binding</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="s2.3.5.html" rel="section">§2.3.5 Consequences of lifting problems</a></div> |
| <div class="subsect depth4" id="s2.3.5.d"> |
| <h4 class="subsect">§2.3.5.(d) <span class="title">Incompatible redefinition of a role hierarchy</span><a class="img" href="s2.3.5.d.html" |
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| <p>Consider a team <code>T1</code> with a method <code>m</code> with declared lifting regarding role <code>R</code>, |
| where no lifting problems are detected. |
| Consider next a sub-team <code>T2</code> which modifies the hierarchy of role <code>R</code> such that lifting |
| to <code>T2.R</code> is problematic due to a binding ambiguity. |
| In this case clients invoking <code>T1.m()</code> could face the situation at runtime that an instance |
| of <code>T2</code> is used that <em>unexpectedly</em> fails to lift to its role <code>R</code>. |
| Here, the compiler signals a specific error against <code>T2</code> alerting of the incompatible change. |
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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="s2.3.5.html" rel="section">§2.3.5 Consequences of lifting problems</a></div> |
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| width="88" /></a><address>© Stephan Herrmann, Christine Hundt, Marco Mosconi</address> |
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