>expression_type</code></td>
<td>Type of the expression which is <code>E</code>.</td>
</tr>
<tr>
<td><code>tensor_type</code></td>
<td>Reference type which is <code>T</code>.</td>
</tr>
<tr>
<td><code>unary_operation</code></td>
<td>Type of the unary operation which is <code>OP</code>.</td>
</tr>
</tbody>
</table>

<h4>Public Member Functions</h4>
<table border="1" summary="members">
<tbody>
<tr>
<th>Member</th>
<th>Description</th>
</tr>
<tr>
<td><code>decltype(auto) operator()(std::size_t i) const </code>