zaxis <z_a...@163.com> wrote: >> let aaa = unsafePerformIO $ newIORef [] >> writeIORef aaa [1,2,3] >> readIORef aaa > [(),(),()]
What in Haskells name do you think you're doing? Don't use unsafePerformIO like that! Its unnecessary and a bit concerning, really. Prelude> :m Data.IORef Prelude Data.IORef> x <- newIORef [] :: IO (IORef [Int]) Prelude Data.IORef> writeIORef x [1,2,3] Prelude Data.IORef> readIORef x [1,2,3] > > sincerely! > -- > View this message in context: > http://www.nabble.com/why-cannot-i-get-the-value-of-a-IORef-variable---tp26004111p26004111.html > Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com. > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe > _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
