[Haskell-cafe] newTArrayIO

[Mattias Bengtsson]

On Fri, 2007-01-26 at 11:34 -0800, Chad Scherrer wrote:
> This seems like a natural thing to have around, but it's not in GHC
> 6.6...
> 
> newTArrayIO :: (Enum i, Ix i) => (i, i) -> a -> IO (TArray i a)
> newTArrayIO (a,b) = liftM (TArray . listArray (a,b)) . sequence .
> zipWith ignore [a..b] . repeat . newTVarIO 
>   where ignore = flip const
> 
> I haven't done any testing with this beyond type checking, but it
> seems like it could be useful for similar cases to newTVarIO. Has
> anyone else played with anything similar?
> 

Agree. I learned lots regarding technologies that seemed like pure magic
before, like GADT's and fundeps etc.
Definately a good read.

Mattias
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