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| <td class="back"><a id="top"></a><a href="s1.2.1.c.html" rel="prev"><< §1.2.1.(c) public role classes</a></td> |
| <td class="top"><a href="index.html" rel="contents">↑ Table of Contents ↑</a></td> |
| <td class="next"><a href="s1.2.1.e.html" rel="next">§1.2.1.(e) Role features >></a></td> |
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| <div class="breadcrumb"><a class="nav" href="s1.html" rel="section">§1 Teams and Roles</a> > <a class="nav" href="s1.2.html" rel="section">§1.2 Role classes and objects</a> > <a class="nav" href="s1.2.1.html" rel="section">§1.2.1 Modifiers for roles</a></div> |
| <div class="subsect depth4" id="s1.2.1.d"> |
| <h4 class="subsect">§1.2.1.(d) <span class="title">abstract role classes</span></h4> |
| <p>A role class has to be marked <strong>abstract</strong> if any of its methods |
| is not effective.<br /> |
| The <em>methods of a role class</em> comprise direct methods and |
| methods acquired by inheritance. |
| In addition to regular inheritance a role class may acquire methods |
| also via implicit inheritance (<a href="s1.3.1.html" |
| title="§1.3.1 Acquisition and implicit inheritance of role classes" |
| class="sect">§1.3.1</a>).<br /> |
| A method may become <em>effective</em> by either: |
| |
| </p> |
| <ul> |
| <li>implementation (i.e., a regular method body), or</li> |
| <li>a callout binding (see <a href="s3.html" title="§3 Callout Binding" class="sect">§3</a>). |
| </li> |
| </ul> |
| <p><a href="s2.5.html" title="§2.5 Abstract Roles" class="sect">§2.5</a> discusses under which |
| circumstances abstract roles force the enclosing team to be abstract, too. |
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| <td class="back"><a href="s1.2.1.c.html" rel="prev"><< §1.2.1.(c) public role classes</a></td> |
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| <div class="breadcrumb"><a class="nav" href="s1.html" rel="section">§1 Teams and Roles</a> > <a class="nav" href="s1.2.html" rel="section">§1.2 Role classes and objects</a> > <a class="nav" href="s1.2.1.html" rel="section">§1.2.1 Modifiers for roles</a></div> |
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| <address>© Stephan Herrmann, Christine Hundt, Marco Mosconi</address> |
| OT/J version 1.3 — last modified: 2010-02-20 |
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