otation">R</span> <span class="parameter-name">f</span>()</span>)
    </section>

        <section class="summary source-code" id="source">
      <h2><span>Implementation</span></h2>
      <pre class="language-dart"><code class="language-dart">typedef RegisterCallbackHandler = ZoneCallback&lt;R&gt; Function&lt;R&gt;(
    Zone self, ZoneDelegate parent, Zone zone, R Function() f);</code></pre>
    </section>

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

  <div id="dartdoc-sidebar-right" class="col-xs-6 col-sm-6 col-md-