> > From: Joel Burget <joelbur...@gmail.com> > Subject: [Haskell-cafe] Assimp FFI Library > To: haskell-cafe@haskell.org > Message-ID: <banlktimw-71ncbrqnr68kravkzyte1u...@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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