Re: [Haskell-cafe] Simple but interesting (for me) problem

Hallo, On 10/21/09, Tim Wawrzynczak wrote:

Here's an example in the IO monad:

import Data.IORef import System.IO.Unsafe

counter = unsafePerformIO $ newIORef 0

next = do modifyIORef counter (+1) readIORef counter

Naturally, this uses unsafePerformIO, which as you know, is not kosher...

This is different because counter is global. Cheers, -- -alex http://www.ventonegro.org/