t/histogram/axis/variant.html" title="Class template variant">variant</a><span class="special">;</span>

      <span class="comment">// Returns pointer to T in variant or null pointer if type does not match. </span>
      <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">class</span><span class="special">...</span> Us<span class="special">&gt;</span> <span class="identifier">T</span> <span class="