;</span>  <span class="comment">// Default storage, optimized for unweighted histograms. </span>
    <span class="keyword">typedef</span> <span class="identifier">dense_storage</span><span class="special">&lt;</span> <a class="link" href="../boost/histogram/accumulators/weighted_sum.html" title="Class template weighted_sum">accumulators::weighted_sum</a><span class="special">&lt;</span><span class="special">&gt;</span> <span class="special">&gt;</span> <a name="boost.histogram.weight_storage"></a><span clas