ss="special">;</span>

      <span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a name="boost.histogram.axis.circular"></a><span class="identifier">circular</span><span class="special">;</span>

      <span class="comment">// Helper function to mark argument as step size. </span>
      <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class=