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| <td class="back"><a id="top"></a><a href="s3.5.g.html" rel="prev"><< §3.5.(g) Callout override</a></td> |
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| <div class="breadcrumb"><a class="nav" href="s3.html" rel="section">§3 Callout Binding</a> > <a class="nav" href="s3.5.html" rel="section">§3.5 Callout to field</a></div> |
| <div class="subsect depth3" id="s3.5.h"> |
| <h4 class="subsect">§3.5.(h) <span class="title">Inferred callout</span><a class="img" href="s3.5.h.html" title="PermaLink to (h) Inferred callout"><img style="vertical-align:text-top;margin-left:5px;" src="../images/permalink.png" |
| alt="" /></a></h4> |
| <p> If a statement or expression within the body of a bound role class |
| uses a simple name or a name qualified by <code>this</code> |
| which can not be resolved using normal rules, |
| the compiler may infer to use a callout to field instead, |
| given that a field of the required name can be found in the role's declared baseclass. |
| |
| </p> |
| <p> If a callout to field has explicitly been declared it is used for the otherwise |
| unresolved name, if and only if: |
| |
| </p> |
| <ul> |
| <li>the callout declares a role method name the is constructed from the token "set" for |
| a setter or "get" for a getter plus the field name with capital first letter, |
| </li> |
| <li>the base field referenced by the callout has exactly the required name, and</li> |
| <li>the callout kind (set/get) matches the application of the unresolved name as either |
| the left-hand side of an assignment (set) or as an expression (get). |
| </li> |
| </ul> |
| <p> |
| If a matching callout to field is not found, the compiler generates one automatically, |
| which has <code>private</code> visibility. |
| |
| </p> |
| <p> |
| If a callout to field has been inferred it is an error to directly invoke the |
| implicitly generated callout accessor that is formed according to the above rules. |
| |
| </p> |
| <p> |
| Per default inferred callout bindings are disabled, i.e., a compiler |
| must report these as an error. However, a compiler should allow to |
| configure reporting to produce a warning only (which can be suppressed |
| using a <code>@SuppressWarnings("inferredcallout")</code> annotation), |
| or to completely ignore the diagnostic. See also <a href="s3.1.j.html" title="§3.1.(j) Inferred callout" class="sect">§3.1.(j)</a>. |
| |
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| <div class="breadcrumb"><a class="nav" href="s3.html" rel="section">§3 Callout Binding</a> > <a class="nav" href="s3.5.html" rel="section">§3.5 Callout to field</a></div> |
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