.</td>
</tr>
<tr><td><pre class="first last literal-block">
op_impl&lt;
     op_tag&lt;x&gt;::type
   , op_tag&lt;y&gt;::type
   &gt;::<a href="./apply.html" class="identifier">apply</a>&lt;x,y&gt;::type
</pre>
</td>
<td>Any type</td>
<td>Unspecified.</td>
</tr>
<tr><td><tt class="literal"><span class="pre">op&lt;</span></tt><em>x</em><sub>1</sub>,<em>x</em><sub>2</sub>,... <em>x</em><sub>n</sub><tt class="literal"><span class="pre">&gt;::type</span></tt></td>
<td>Any type</td>
<td>Unspecified.</td>
</tr>
<