rence.html#header.boost.histogram.algorithm.sum_hpp" title="Header &lt;boost/histogram/algorithm/sum.hpp&gt;">boost/histogram/algorithm/sum.hpp</a>&gt;

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<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A<span class="special">,</span> <span class="keyword">typename</span> S<span class="special">&gt;</span> <span class="keyword">auto</span> <span class="identifier">sum</span><span class="special">(</span><span class="keyword">const</span> <a c