So something like
newtype StablePtr a = StablePtr (StablePtrST RealWorld a)?
I suppose that could work with some discipline. You have to assume that
foreign code doesn't pick its address out of a hat and so something silly,
but I guess you pretty much have to assume that anyway.
On Wed, Aug 21, 2019, 5:00 AM Matthew Farkas-Dyck
I have been doing some work where i want `StablePtr`, but also to not be confined to `IO`. I saw the following comment in "compiler/prelude/PrimOp.hs":
Question: Why @RealWorld@ - won't any instance of @_ST@ do the job? [ADR]
It has been there for 20 years. What is the answer? If it is safe i'll send the patch generalizing these operations. _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/glasgow-haskell-users