On Sat, 2008-07-19 at 23:55 -0500, Galchin, Vasili wrote:
> yes Duncan I am trying to pass-by-value. I am familiar with
> ForeignPtr; however, I don't comprehend what you and Brandon are
> suggesting to do. Could either of you provide a code illustration or
> point at existing code to illustrate your approach?
Take a look at John Meacham's RSA example.
So at the moment you're using using Storable and a Haskell record, say:
data AIOCB = AIOCB {
...
}
and we're suggesting instead:
newtype AIOCB = AIOCB (ForeignPtr AIOCB)
then to access a member use hsc2hs:
getBlah :: AIOCB -> IO Blah
getBlah (AIOCB fptr) =
withForeignPtr fptr $ \ptr -> {# peek aiocb,blah #} ptr
So you only access the parts you need and keep the aiocb C struct
allocated on the heap (use mallocForeignPtr).
Duncan
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