[EMAIL PROTECTED] (Ketil Z. Malde) wrote: > I'd like a general 'nth', but of course that would restrict us to > monotyped tuples (e.g., > > nth :: Int -> (a,a,...,a,a) -> a > )
Under [1] you find an interesting proposal for Template Haskell. I don't know, how far it is from beiing implemented, but it would allow $(sel 1 3) x to be replaced by (\x -> case x of (a, b, c) -> a) x at compile time. (example from the paper) Using "program reflection" it should even be possible to detect the size of the tuple at compile time, giving your nth function with a slightly different syntax. Regards Nils Decker [1] http://research.microsoft.com/Users/simonpj/papers/meta-haskell/ -- Nils Decker <[EMAIL PROTECTED]> _______________________________________________ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell
