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| <td class="back"><a id="top"></a><a href="s2.4.2.b.html" rel="prev"><< §2.4.2.(b) Bound roles</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="s2.4.2.html" rel="section">§2.4.2 Role creation via a regular constructor</a></div> |
| <div class="subsect depth4" id="s2.4.2.c"> |
| <h4 class="subsect">§2.4.2.(c) <span class="title">Super-call for bound roles</span><a class="img" href="s2.4.2.c.html" |
| title="PermaLink to (c) Super-call for bound roles"><img style="vertical-align:text-top;margin-left:5px;" src="../images/permalink.png" |
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| <p>Instead of or prior to calling <code>base(..)</code> a constructor of a bound role explicitly or implicitly calls a super constructor. |
| Which constructor is applicable depends on the super role and its <code>playedBy</code> clause. |
| |
| </p> |
| <ul> |
| <li>If the super role is bound to the same base class as the current role is, |
| |
| <ul> |
| <li>not writing a super-call causes the lifting constructor of the super role to be invoked.</li> |
| <li>explicitly calling a super constructor requires the super constructor to <i>either</i><ol> |
| <li>create a role instance using a base constructor call (directly or indirectly), <i>or</i></li> |
| <li>be a lifting constructor receiving a base instance, which the current role must provide as the argument.</li> |
| </ol> |
| </li> |
| </ul> |
| </li> |
| <li>If the super role is bound but the current role refines the <code>playedBy</code> |
| relationship (cf. <a href="s2.1.c.html" title="§2.1.(c) Covariant refinement" |
| class="sect">§2.1.(c)</a>), |
| |
| <ul> |
| <li>a lifting constructor must be called explicitly passing a base object as the argument.</li> |
| </ul> |
| </li> |
| <li>If the role has an explicit or implicit super role which is unbound the constructor may optionally |
| call a super constructor (using <code>super(..)</code> or <code>tsuper(..)</code>) prior to calling |
| <code>base(..)</code>. Otherwise the default constructor is implicitly invoked. |
| |
| </li> |
| </ul> |
| <p>When invoking a lifting constructor of a super role the base object can optionally be obtained by using a base constructor |
| call as an expression: |
| |
| </p> |
| <div class="listing plain"><pre>super(base(<i><args></i>));</pre></div> |
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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="s2.4.2.html" rel="section">§2.4.2 Role creation via a regular constructor</a></div> |
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