[Haskell-beginners] Template Haskell confusion

17 Jul 2010

      I'm trying to learn Template Haskell.

I decided to try to write a mapTup function which takes function and a tuple
(e.g. mapTup id (1,"hi",'a') ) and, well, applies the function to each cell.

The closest I've gotten so far is this:
...
{-# LANGUAGE TemplateHaskell #-}
module MapTup
where
import Language.Haskell.TH
import Control.Monad
mapTup fun tup = do
  funE <- runQ $ [| $fun |]
  TupE tupContents <- runQ $ [| $tup |]
  return $ TupE $ map (AppE funE) tupContents
The problem is that I can't figure out how to get the representation of the
values bound to fun and tup.

Sorry if I'm wording this badly.  My head hurts from meta-programming ;)

-- 
          Alex R

[Haskell-beginners] Template Haskell confusion

Alex Rozenshteyn