At 2001-09-20 04:56, Simon Marlow wrote:
>ForeignPtrs are defined like this
>
> data ForeignPtr a = ForeignPtr ForeignObj#
>
>where ForeignObj# is a *boxed* address, it corresponds to a real heap
>object. The heap object is primitive from the point of view of the
>compiler - it can't be optimised away. So it works to attach a
>finalizer to the ForeignObj# (but not to the ForeignPtr!).
OK, you are saying that the ForeignObj# is a representation of a 'Ptr a',
but in a way such that the compiler can't optimise away the box. Is that
correct?
Could ForeignPtr be generalised so that its ForeignObj# could represent
any type, rather than just a Ptr?
--
Ashley Yakeley, Seattle WA
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