span><span class="special">&lt;</span><span class="keyword">typename</span> Histogram<span class="special">&gt;</span> 
      <span class="keyword">auto</span> <a class="link" href="../boost/histogram/indexed.html" title="Function template indexed"><span class="identifier">indexed</span></a><span class="special">(</span><span class="identifier">Histogram</span> <span class="special">&amp;&amp;</span><span class="special">,</span> <span class="identifier">coverage</span> <span class="special">=</span> <span 