Testing if Cocoa object references are valid?
<p>I'm doing some lazy image loading for thumbnails to be displayed in a table. I have a class that loads the image for me asynchronously...but my problem (or at least, a problem) is that by the time the image loads, I have no idea whether the cell that initiated the image load even exists anymore. Is there a way for me to test to see if a particular object reference is valid before I call it?</p>

<p>Thanks.</p>
