All, what is wrong w the below code?
I get an type error related to the operation shiftL
import Data.Bits
import Data.Word
import Data.IORef
data Word32s = Word32s { x :: IORef Word32 }
bitfield :: Word32
bitfield = 0
mkbitfield :: Word32 -> IO Word32s
mkbitfield i = do the_bf <- newIORef i
shiftL has the wrong type: Bits a => a -> Int -> a
so it is expecting the value in the IORef to be an Int.
Edward
Excerpts from Joerg Fritsch's message of Thu Jul 18 10:08:22 -0700 2013:
> All, what is wrong w the below code?
>
> I get an type error related to the operation shiftL
>
> import D
Can I easily fix the modifyIORef statement by swapping "something" ?
--Joerg
On Jul 18, 2013, at 7:19 PM, "Edward Z. Yang" wrote:
> shiftL has the wrong type: Bits a => a -> Int -> a
> so it is expecting the value in the IORef to be an Int.
>
> Edward
>
> Excerpts from Joerg Fritsch's message
Joerg Fritsch, Thu 2013-07-18 @ 19:22:46+0200:
> Can I easily fix the modifyIORef statement by swapping "something" ?
> --Joerg
Replace `shiftL` with `flip shiftL` and change the type signature of
`sLbitfield` to take an Int instead of an Integer.
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