| <!DOCTYPE html |
| PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "../xhtml1-strict.dtd"> |
| <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> |
| <head> |
| <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> |
| <link rel="stylesheet" type="text/css" href="../css/ot.css" /> |
| <link rel="stylesheet" type="text/css" href="../css/otjld.css" /> |
| <title>OT/J Language Definition v1.3.1</title> |
| </head> |
| <body class="otdt"> |
| <div id="content"> |
| <table class="nav"> |
| <tr> |
| <td class="back"><a id="top"></a><a href="s4.1.a.html" rel="prev"><< §4.1.(a) Method call interception</a></td> |
| <td class="top"><a href="index.html" rel="contents">↑ Table of Contents ↑</a></td> |
| <td class="next"><a href="s4.1.c.html" rel="next">§4.1.(c) Callin declaration >></a></td> |
| </tr> |
| </table> |
| <div class="breadcrumb"><a class="nav" href="s4.html" rel="section">§4 Callin Binding</a> > <a class="nav" href="s4.1.html" rel="section">§4.1 Callin method binding</a></div> |
| <div class="subsect depth3" id="s4.1.b"> |
| <h4 class="subsect">§4.1.(b) <span class="title">Prerequisite: Class binding</span><a class="img" href="s4.1.b.html" |
| title="PermaLink to (b) Prerequisite: Class binding"><img style="vertical-align:text-top;margin-left:5px;" src="../images/permalink.png" |
| alt="" /></a></h4> |
| <p>A callin binding requires the enclosing class to be a role class |
| bound to a base class according to <a href="s2.1.html" title="§2.1 playedBy relation" class="sect">§2.1</a>. |
| An <em>unliftable</em> role (see <a href="s2.3.4.a.html" title="§2.3.4.(a) Potential ambiguity" |
| class="sect">§2.3.4.(a)</a>) should not define callin bindings. |
| In this case callin bindings can only safely be introduced in sub-roles |
| which (by an appropriately refined <code>playedBy</code> clause) disambiguate the lifting translation. |
| |
| </p> |
| <p> |
| For corner cases the above rule can be overridden by suppressing the corresponding error |
| using the <code>"hidden-lifting-problem"</code> token (see <a href="s2.3.5.html" |
| title="§2.3.5 Consequences of lifting problems" |
| class="sect">§2.3.5</a>). |
| This will allow callin bindings to be defined even for unliftable roles expecting that lifting |
| may still succeed by one of the patterns desribed in <a href="s2.3.4.b.html" title="§2.3.4.(b) Definite ambiguity" |
| class="sect">§2.3.4.(b)</a>. |
| |
| </p> |
| </div> |
| <table class="nav"> |
| <tr> |
| <td class="back"><a href="s4.1.a.html" rel="prev"><< §4.1.(a) Method call interception</a></td> |
| <td class="top"><a href="index.html" rel="contents">↑ Table of Contents ↑</a></td> |
| <td class="next"><a href="s4.1.c.html" rel="next">§4.1.(c) Callin declaration >></a></td> |
| </tr> |
| </table> |
| <div class="breadcrumb"><a class="nav" href="s4.html" rel="section">§4 Callin Binding</a> > <a class="nav" href="s4.1.html" rel="section">§4.1 Callin method binding</a></div> |
| </div> |
| <div id="footer"> |
| <hr /><a class="w3c img" href="http://jigsaw.w3.org/css-validator/check/referer" |
| shape="rect"><img src="../images/valid-css2-blue.png" alt="Valid CSS!" height="31" width="88" /></a><a class="w3c img" href="http://validator.w3.org/check?uri=referer" shape="rect"><img src="../images/valid-xhtml10-blue.png" alt="Valid XHTML 1.0 Strict" height="31" |
| width="88" /></a><address>© Stephan Herrmann, Christine Hundt, Marco Mosconi</address> |
| OT/J version 1.3.1 — last modified: 2013-05-28 |
| </div> |
| </body> |
| </html> |
