Subj : Reserving another slot for private data
To   : netscape.public.mozilla.jseng
From : Sterling Bates
Date : Thu Apr 22 2004 12:55 pm

I need to store within each object a reference back to the Delphi 
object.  I can currently do so with standard JS objects, but I need the 
same for strings and doubles, which occupy their standard private slot. 
  So I think I would use this slot like so:

1. Implement JSClass.reserveSlots to return 1 (since I only need one slot.)
2. After the object is created, use JS_SetReservedSlot to assign the 
slot value.
3. When I need to get the Delphi object reference, call JS_GetReservedSlot.

The problem is that conversion to & from a jsval could drop the 
left-most bit in the pointer, which would be problematic.  Is that 
actually an issue, and how could I avoid this?

Sterling

.