s="link" href="optional_last_value.html" title="Class template optional_last_value">optional_last_value</a> as the default, which
            does not throw.
          </p>
<div class="refsect2">
<a name="id-1.3.37.6.6.3.4.3"></a><h3>
<a name="id-1_3_37_6_5_1_1_1_5-bb"></a><code class="computeroutput">last_value</code> invocation</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</spa