boost/histogram/axis/option/circular.html" title="Global circular">circular</a><span class="special">;</span>        <span class="comment">// Instance of <code class="computeroutput">circular_t</code>. </span>
        <span class="keyword">constexpr</span> <span class="identifier">growth_t</span> <a class="link" href="../boost/histogram/axis/option/growth.html" title="Global growth">growth</a><span class="special">;</span>        <span class="comment">// Instance of <code class="computeroutput">growth_t</co