[Haskell-cafe] newTArrayIO

[Mattias Bengtsson]

On Fri, 2007-01-26 at 23:26 +0100, Mattias Bengtsson wrote:
> 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.


Hrrm. This was meant as a reply to Justin Bailey, sorry.
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