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<div class="breadcrumb"><a class="nav" href="s9.html" rel="section">&sect;9&nbsp;Value Dependent Classes</a>&nbsp;&gt;&nbsp;<a class="nav" href="s9.2.html" rel="section">&sect;9.2&nbsp;Using classes with value parameters</a>&nbsp;&gt;&nbsp;<a class="nav" href="s9.2.1.html" rel="section">&sect;9.2.1&nbsp;Parameter substitution</a></div>
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<h4 class="subsect">&sect;9.2.1.(a)&nbsp;<span class="title">Instance constrained type parameters</span><a class="img" href="s9.2.1.a.html"
title="PermaLink to (a)&nbsp;Instance constrained type parameters"><img style="vertical-align:text-top;margin-left:5px;" src="../images/permalink.png"
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<p>In addition to normal usage, a value parameter can be applied nested to a regular type parameter:
</p>
<div class="listing plain"><pre><b>class</b> MyClass&lt;YourType aName, DependentParam&lt;<em>@aName&gt;</em>&gt; { ...</pre></div>
<p>
Here the type parameter <code>DependentParam</code> is constrained to be anchored to <code>aName</code>.
</p>
<p>If a value parameter is used as a constraint for a regular type parameter
any substitution for the type parameter must also supply a value matching the value parameter.
The class from above could be applied like this:
</p>
<div class="listing plain"><pre><b>final</b> YourType anchor = <b>new</b> YourType();
MyClass <em>&lt;anchor, YourDependent&lt;<strong>anchor</strong>&gt;&gt;</em></pre></div>
<p>Within the declaring element (class or method)
applications of the type variable representing the instance constrained type parameter
must repeat the anchor verbatim, i.e., no substitutions are performed here.
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<div class="breadcrumb"><a class="nav" href="s9.html" rel="section">&sect;9&nbsp;Value Dependent Classes</a>&nbsp;&gt;&nbsp;<a class="nav" href="s9.2.html" rel="section">&sect;9.2&nbsp;Using classes with value parameters</a>&nbsp;&gt;&nbsp;<a class="nav" href="s9.2.1.html" rel="section">&sect;9.2.1&nbsp;Parameter substitution</a></div>
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OT/J version 1.3 &mdash; last modified: 2010-06-08
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