[Haskell-cafe] newTArrayIO

Mattias Bengtsson moonlite at dtek.chalmers.se
Fri Jan 26 17:26:08 EST 2007

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.

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