nk" href="../boost/histogram/axis/traits/metadata.html" title="Function template metadata"><span class="identifier">metadata</span></a><span class="special">(</span><span class="identifier">Axis</span> <span class="special">&amp;&amp;</span><span class="special">)</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">constexpr</span> <span class="keyw