"identifier">get_if</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="../boost/histogram/axis/variant.html" title="Class template variant">variant</a><span class="special">&lt;</span> <span class="identifier">Us</span><span class="special">...</span> <span class="special">&gt;</span> <span class="special">*</span> v<span class="special">)</span><span class="special">;</span>

      <span class="comment">// Apply visitor to variant. </span>
      <span class="keywor