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| <td class="back"><a id="top"></a><a href="s2.3.4.b.html" rel="prev"><< §2.3.4.(b) Definite ambiguity</a></td> |
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| <td class="next"><a href="s2.3.4.d.html" rel="next">§2.3.4.(d) Mismatching role >></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="s2.3.4.html" rel="section">§2.3.4 Binding ambiguities</a></div> |
| <div class="subsect depth4" id="s2.3.4.c"> |
| <h4 class="subsect">§2.3.4.(c) <span class="title">Actual ambiguity</span><a class="img" href="s2.3.4.c.html" |
| title="PermaLink to (c) Actual ambiguity"><img style="vertical-align:text-top;margin-left:5px;" src="../images/permalink.png" |
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| <p>At runtime <strong>actual ambiguity</strong> may occur if for the |
| <em>dynamic type</em> of a base to be lifted the conditions of (b) |
| above hold accordingly. Actual ambiguity is only possible in cases |
| reported by the compiler as potential or definite ambiguity. |
| |
| </p> |
| <div class="note"> |
| <h5>Effect:</h5> |
| An actual ambiguity is reported at runtime by throwing a |
| <code>org.objectteams.LiftingFailedException</code>. |
| |
| </div> |
| <h5 class="listing">Example code (Actual Ambiguity):</h5> |
| <div class="listing example frame"> |
| <table class="listing"> |
| <tr class="line odd"> |
| <td class="ln">1</td> |
| <td><pre><b>import</b> org.objectteams.LiftingFailedException;</pre></td> |
| </tr> |
| <tr class="line even"> |
| <td class="ln">2</td> |
| <td><pre><b>team</b> <b>class</b> MyTeam {</pre></td> |
| </tr> |
| <tr class="line odd"> |
| <td class="ln">3</td> |
| <td><pre> <b>public</b> <b>class</b> SuperRole <b>playedBy</b> MyBase {...}</pre></td> |
| </tr> |
| <tr class="line even"> |
| <td class="ln">4</td> |
| <td><pre> <b>public</b> <b>class</b> SubRoleA <b>extends</b> SuperRole <b>playedBy</b> SubBase {...}</pre></td> |
| </tr> |
| <tr class="line odd"> |
| <td class="ln">5</td> |
| <td><pre> <b>public</b> <b>class</b> SubRoleB <b>extends</b> SuperRole <b>playedBy</b> SubBase {...}</pre></td> |
| </tr> |
| <tr class="line even"> |
| <td class="ln">6</td> |
| <td><pre> </pre></td> |
| </tr> |
| <tr class="line odd"> |
| <td class="ln">7</td> |
| <td><pre> <b>public</b> <b>void</b> useSuperRole(MyBase <b>as</b> SuperRole r) <b>throws</b> LiftingFailedException {...}</pre></td> |
| </tr> |
| <tr class="line even"> |
| <td class="ln">8</td> |
| <td><pre>}</pre></td> |
| </tr> |
| <tr class="line odd"> |
| <td class="ln">9</td> |
| <td><pre><span class="comment">// plus these calls:</span></pre></td> |
| </tr> |
| <tr class="line even"> |
| <td class="ln">10</td> |
| <td><pre>MyTeam mt = <b>new</b> MyTeam();</pre></td> |
| </tr> |
| <tr class="line odd"> |
| <td class="ln">11</td> |
| <td><pre>mt.useSuperRole(<b>new</b> SubBase()); <span class="comment">// <span class="error">will throw a LiftingFailedException</span></span></pre></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="s2.3.4.html" rel="section">§2.3.4 Binding ambiguities</a></div> |
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