• Ben Harper (4/4) May 13 2005 I'm trying to store a GC pointer in non-GC space. How do I do this?
• Ben Hinkle (9/13) May 13 2005 You can pass "this" anyone as long as there always is at least one refer...

"Ben Harper" <ben gls.co.za> writes:

I'm trying to store a GC pointer in non-GC space. How do I do this?
My specific case is this:
SetProp( hWnd, "DWndPtr", this );

What does one do with the 'this'?

"Ben Hinkle" <bhinkle mathworks.com> writes:

"Ben Harper" <ben gls.co.za> wrote in message 
news:d61vq8$20he$1 digitaldaemon.com...
 I'm trying to store a GC pointer in non-GC space. How do I do this?
 My specific case is this:
 SetProp( hWnd, "DWndPtr", this );

 What does one do with the 'this'?

You can pass "this" anyone as long as there always is at least one reference 
within the GC scanning space. So storing "this" in the hwnd isn't a problem 
if you also keep a global list of windows around (or something like that). 
The biggest problem is that some day a compacting GC might be implemented 
that would move "this" and then your externally-stored pointer would be 
pointing to the wrong place. The safest thing to do is store "this" in an 
assoc array indexed by the hWnd.