Re: [Haskell-cafe] [Haskell-beginners] theStdGen unsafePerformIO

You might get more answers to this sort of question on the haskell-cafe list. Even there, I think you might need to ask whoever the authors were for a question like this :-) On Sun, Jan 9, 2011 at 9:55 AM, John Smith wrote:

Why does theStdGen require unsafePerformIO? I recompiled the Random module with

theStdGen :: IO (IORef StdGen) theStdGen  = do                rng <- mkStdRNG 0                newIORef rng

The implementations of a few functions needed to change slightly (to extract the IORef from IO), but no other type signatures needed changing, and nothing blew up.

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