ecified S</td>
<td align="left"><p>construct an instance of S from a value of type T.
              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</code></td>
<td align="left">S</td>
<td align="left"><p>construct an uninitialized instance of
              S.</p></td>
</tr>
<tr>
<td align="left"><code class="computeroutput">is_safe&lt;S&gt;</code></td>
<td align="left">
<code class="computeroutpu