an>
    }</pre>
</div><h4>Requirements:</h4>
<div><ul><li> ErrorInfo must be an instance of the <span class="RenoLink"><a href="error_info.html">error_info</a></span> template.</li>
<li> E must be polymorphic.</li>
</ul></div>
<h4>Returns:</h4>
<div><ul><li> If dynamic_cast&lt;boost::<span class="RenoLink"><a href="exception.html">exception</a></span> const *&gt;(&amp;x) is 0, or if x does not store an object of type ErrorInfo, the returned value is null.</li>
<li> Otherwise, the returned pointer points to 