From: Lyle Johnson <lyle@...>
Date: 2003-04-03T03:32:24+09:00
Subject: Checking for valid Ruby objects?

If I have a void pointer in C extension code, is there any way to tell 
if it is a valid Ruby object (versus a pointer to some other data), 
similar to what's done in the (private) is_pointer_to_heap() function?