rt_attachDisposeEvent: the apparent magic behind std.signals

[Gareth Charnock]

I was looking at the std.signals code in svn to find out how the magic 
of the observer class not needing to inherit anything was done and I was 
somewhat disappointed to see rt_attachDisposeEvent. Is this function 
standardised or exposed anywhere? I can think of cases where being able 
to listen for the dying screams of deleted objects might be useful.