="header.boost.histogram.algorithm.sum_hpp"></a>Header &lt;<a href="../../../../../boost/histogram/algorithm/sum.hpp" target="_top">boost/histogram/algorithm/sum.hpp</a>&gt;</h3></div></div></div>
<pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
  <span class="keyword">namespace</span> <span class="identifier">histogram</span> <span class="special">{</span>
    <span class="keyword">namespace</span> <span class="identifier">alg