[Haskell-cafe] Fast conversion between Vector Double and Vector CDouble

[Jason Dagit]

On Mon, Apr 4, 2011 at 6:41 AM, Bas van Dijk <v.dijk.bas at gmail.com> wrote:

>
>
> Thanks for the clarification Daniel.
>
> I just read[1] it's also possible to directly use Double and Float in
> an FFI import declaration. I always assumed you could only use the C
> types from Foreign.C.Types.
> So I think I'm going to change bindings-levmar[2] to use Double and
> Float instead of CDouble and CFloat. This way I don't even need to
> map.
>

It's just that on some platforms/Haskell implementations the Haskell
Double/Float may not line up with the C side.  If you use CDouble/CFloat it
will line up.  Compared to unsafeCoerce, I would hope you'd get a C compile
error on those platforms, but I don't know for certain if that's the case.

In my opinion, it's the conversion functions that need to be fixed.

Jason
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