</span> <span class="special">&gt;</span> <span class="special">&amp;</span> h<span class="special">,</span> <span class="keyword">double</span> x<span class="special">)</span><span class="special">;</span>
    <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> <a name="boost.histogram.operator_idm4510599437