Passing a matrix from C to Haskell
Benjamin.Rudiak-Gould at cl.cam.ac.uk
Wed Feb 8 16:38:04 EST 2006
Cyril Schmidt wrote:
> I was thinking of something like passing the array as Ptr Int#, but how
> do I fetch the elements that I am interested in?
I think you want Ptr CInt and peekElemOff. If the array is declared in C as
and p :: Ptr CInt is a Haskell pointer to it, then a[y][x] can be accessed
as peekElemOff p (y * 20 + x). This should be 100% portable.
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