[Haskell-cafe] Assimp FFI Library

[John Lato]

>
> From: Joel Burget <joelburget at gmail.com>
> Subject: [Haskell-cafe] Assimp FFI Library
> To: haskell-cafe at haskell.org
> Message-ID: <BANLkTimW-71NcBRqnr68kRAvKZytE1uVwA at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"


> 5. I've reduced a lot of boilerplate in Vec.hs by using the CPP
> preprocessor
> extension. I could reduce the boilerplate by another factor of 3 if I could
> recursively call templates but that's not allowed. I would like to have one
> template to generate both of these lines:
>
> > data Vec N2 Double t = Vec2D !Double !Double deriving (Show, Eq)
> > data Vec N3 Double t = Vec3D !Double !Double !Double deriving (Show, Eq)
>
> Notice there is an extra !Double in the second. Is there an easy way to do
> this? I don't know much about Template Haskell, would that work? Would it
> be
> easy?
>

Yes, it works, and it's pretty easy.  My adaptive-tuple package,
http://hackage.haskell.org/package/adaptive-tuple, provides this (as well as
strict vectors up to 20 elements).  Tuple is a bit of a misnomer.  You'll
need to download the source to get the Template Haskell splices because they
aren't exported (tarball from hackage, or via
http://www.tiresiaspress.us/haskell/adaptive-tuple/)

John L.
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