lass="keyword">class</span><span class="special">...&gt;</span> <span class="keyword">class</span> <span class="identifier">Op</span><span class="special">,</span> <span class="keyword">class</span><span class="special">...</span> <span class="identifier">Args</span><span class="special">&gt;</span>
<span class="keyword">using</span> <span class="identifier">detected_t</span> <span class="special">=</span> <em class="replaceable"><code>see-below</code></em><span class="special">;</span>
</pre>
<p>
        <