> At 2002-11-18 11:05, Sven Panne wrote: > > >global :: a -> IORef a > >global a = unsafePerformIO (newIORef a) > > This is useful, you can do this with it: > > ref = global Nothing > > convert :: a -> IO b > convert a = do > writeIORef ref (Just a) > Just b <- readIORef ref > return b
This particular "flexibility" provided by unsafePerformIO is actually documented... http://www.haskell.org/ghc/docs/latest/html/base/System.IO.Unsafe.html#u nsafePerformIO Cheers, Simon _______________________________________________ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
