Re: [Haskell-beginners] Global variables

You can store IORef / MVar / whatever in the environment. The counter is supposed to be global, so it should work for multiple threads. Best regards, Krzysztof Skrzętnicki On Wed, Jun 29, 2011 at 17:27, Christopher Done wrote:

On 29 June 2011 17:22, Michael Xavier wrote:

...

I tend to use Control.Monad.Reader for stateful stuff like this. It is found in the mtl package http://hackage.haskell.org/package/mtl-2.0.1.0

How would you use reader for a counter?

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