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<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Axis<span class="special">></span> <span class="keyword">decltype</span><span class="special">(</span><span class="keyword">auto</span><span class="special">)</span> <span class="identifier">metadata</span><span class="special">(</span><span class="identifier">Axis</span> <span class="special">&&</span> axis<span class="special">)</span><span class="special">;</span></pre></div>
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-<a name="idm45952479172272"></a><h2>Description</h2>
+<a name="idm45212145155152"></a><h2>Description</h2>
<p>If the expression x.metadata() for an axis instance <code class="computeroutput">x</code> (maybe const) is valid, return the result. Otherwise, return a reference to a static instance of <code class="computeroutput"><a class="link" href="../null_type.html" title="Struct null_type">boost::histogram::axis::null_type</a></code>.</p>
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