> From: Christian H?ner zu Siederdissen > > Hi, > > I am thinking about how to easily generate instances for a class. Each > instance is a tuple with 1 or more elements. In addition there is a > second tuple with the same number of elements but different type. This > means getting longer and longer chains of something like (...,x3*x2,x2,0). > > - template haskell? > - CPP and macros? > > Consider arrays with fast access like Data.Vector, but with higher > dimensionality. Basically, I want (!) to fuse when used in Data.Vector > code.
(shameless plug) You may want to look at my AdaptiveTuple package, which does something very similar to this. I used Template Haskell because AFAIK neither generic approaches nor DrIFT/Derive will generate data decls. If all you need are the instances, then DrIFT or Derive would be my recommendations. Cheers, John _______________________________________________ Glasgow-haskell-users mailing list [email protected] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
