(fcinfo)-&gt;context, EventTriggerData))
</pre><p>
    If this returns true, then it is safe to cast
    <code class="literal">fcinfo-&gt;context</code> to type <code class="literal">EventTriggerData
    *</code> and make use of the pointed-to
    <code class="structname">EventTriggerData</code> structure.  The function must
    <span class="emphasis"><em>not</em></span> alter the <code class="structname">EventTriggerData</code>
    structure or any of the data it points to.
   </p><p>
    <code class="stru