 instance of <code>R</code> to be valid arguments to the adding function,
and they must be instances of <code>E</code> as well to be accepted by
this set as well.</p>
    </section>
    
    <section class="summary source-code" id="source">
      <h2><span>Implementation</span> </h2>
      <pre class="language-dart"><code class="language-dart">Set&lt;R&gt; retype&lt;R&gt;();</code></pre>
    </section>

  </div> <!-- /.main-content -->

  <div class="col-xs-6 col-sm-6 col-md-2 sidebar sidebar-offcanvas-righ