tional_last_value_hpp" title="Header &lt;boost/signals2/optional_last_value.hpp&gt;">boost/signals2/optional_last_value.hpp</a>&gt;

</span>
<span class="keyword">class</span> <a class="link" href="optional_last__idp75552224.html" title="Class optional_last_value&lt;void&gt;">optional_last_value</a><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="