18 Nov
2002
18 Nov
'02
5:40 p.m.
Yes, there are several reasons for having UNSAFE in the name. :-) -- Lennart Ashley Yakeley wrote:
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