s="link" href="optional_last_value.html" title="Class template optional_last_value">optional_last_value</a> would otherwise try to
            use as its <code class="computeroutput">result_type</code>.  This specialization
            instead sets the <code class="computeroutput">result_type</code> to be <code class="computeroutput">void</code>.
          </p>
<div class="refsect2">
<a name="idp162135904"></a><h3>
<a name="idp75537808-bb"></a><code class="computeroutput">optional_last_value</code> invocati