On Wed, 08 Dec 2010 10:03:40 +0100, Magicloud Magiclouds
<magicloud.magiclo...@gmail.com> wrote:
Hi,
Formerly, I had IORef and some state monad to do the task of keeping
states.
Now in haskell 2010, I cannot find anything about it. Do I have to
use ghc base package for this function?
These are not standard Haskell '98 or Haskell 2010. You can find IORef in
the base package; the state monad is in both the mtl and the transformers
package (mtl is deprecated). The state monad uses the multi-parameter type
class extension and is therefore not in standard Haskell '98 or Haskell
2010 code. IORef also uses non-standard code.
Regards,
Henk-Jan van Tuyl
--
http://Van.Tuyl.eu/
http://members.chello.nl/hjgtuyl/tourdemonad.html
--
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