 A1<span class="special">,</span> <span class="keyword">typename</span> S1<span class="special">,</span> <span class="keyword">typename</span> A2<span class="special">,</span> <span class="keyword">typename</span> S2<span class="special">&gt;</span> 
      <span class="keyword">auto</span> <a name="boost.histogram.operator_idm45105994394896"></a><span class="keyword">operator</span><span class="special">*</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="../boost/h