pan class="keyword">namespace</span> <span class="identifier">accumulators</span> <span class="special">{</span>
      <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> RealType<span class="special">&gt;</span> <span class="keyword">class</span> <a class="link" href="../boost/histogram/accumulators/weighted_mean.html" title="Class template weighted_mean">weighted_mean</a><span class="special">;</span>
    <span class="special">}</span>
  <span class=