ost.histogram.accumulators.meanconstruct-copy-destruct">construct/copy/destruct</a></span>
  <a class="link" href="mean.html#idm45106007705952-bb"><span class="identifier">mean</span></a><span class="special">(</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span>
  <a class="link" href="mean.html#idm45106007705392-bb"><span class="identifier">mean</span></a><span class="special">(</span><span class="keyword">const</span> <span