[<<][meta][>>][..]Mon Dec 5 19:03:52 EST 2011

So... How to make Value work with STUArray / ST[2]. I think it's best to make the interface a bit more general though, and start with MArray[1][3]. import Control.Monad.ST import Data.Array.ST import Data.Array.MArray import Data.Array.Base This seems to be it: instance (Monad m, MArray a t m) => Array m Value (a Int) t where _get (Value a) (Value i) = liftM Value $ readArray a i _set (Value a) (Value i) (Value e) = liftM Value $ writeArray a i e Now, how to use it? To test it, let's try to write a "sum" program. This involves the whole bazar: computations, conditionals, loops and arrays. [1] http://www.haskell.org/ghc/docs/latest/html/libraries/array/Data-Array-MArray.html [2] http://www.haskell.org/ghc/docs/6.10.4/html/libraries/base/Control-Monad-ST.html#t%3AST [3] http://www.haskell.org/haskellwiki/Arrays#Mutable_arrays_in_ST_monad_.28module_Data.Array.ST.29

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