trary numeric types.</p>
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<tr><th class="head">Expression</th>
<th class="head">Type</th>
<th class="head">Complexity</th>
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<tr><td><tt class="literal"><span class="pre">op_tag&lt;x&gt;::type</span></tt></td>
<td><a class="reference internal" href="./integral-constant.html">Integral Constant</a></td>
<td>Amortized constant time