t"><p>invoke C++ operator <code class="computeroutput">postfix_op</code> and
              return another SafeNumeric type.</p></td>
</tr>
<tr>
<td align="left"><code class="computeroutput">s assign_op t</code></td>
<td align="left">S1</td>
<td align="left"><p>convert t to type S and assign it to s. If the
              value t cannot be represented as an instance of type S, it is an
              error.</p></td>
</tr>
<tr>
<td align="left"><code class="computeroutput">S(t)</code></td>
<td align="left">unsp