n class="identifier">histogram</span> <span class="special">{</span>
    <span class="keyword">namespace</span> <span class="identifier">axis</span> <span class="special">{</span>
      <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Axis<span class="special">&gt;</span> <span class="keyword">class</span> <a class="link" href="../boost/histogram/axis/interval_view.html" title="Class template interval_view">interval_view</a><span class="special">;</