2 % (c) The AQUA Project, Glasgow University, 1994-1996
5 \section[IOExts]{Module @IOExts@}
8 {-# OPTIONS -fno-implicit-prelude #-}
16 -- instance Eq (IORef a)
22 -- instance Eq (IOArray ix a)
45 reallyUnsafePtrEq a b =
46 case reallyUnsafePtrEquality# a b of
52 newtype IORef a = IORef (MutableVar RealWorld a)
55 newIORef :: a -> IO (IORef a)
56 newIORef v = stToIO (newVar v) >>= \ var -> return (IORef var)
58 readIORef :: IORef a -> IO a
59 readIORef (IORef var) = stToIO (readVar var)
61 writeIORef :: IORef a -> a -> IO ()
62 writeIORef (IORef var) v = stToIO (writeVar var v)
66 newtype IOArray ix elt = IOArray (MutableArray RealWorld ix elt)
69 newIOArray :: Ix ix => (ix,ix) -> elt -> IO (IOArray ix elt)
70 boundsIOArray :: Ix ix => IOArray ix elt -> (ix, ix)
71 readIOArray :: Ix ix => IOArray ix elt -> ix -> IO elt
72 writeIOArray :: Ix ix => IOArray ix elt -> ix -> elt -> IO ()
73 freezeIOArray :: Ix ix => IOArray ix elt -> IO (Array ix elt)
76 stToIO (newArray ixs elt) >>= \arr ->
79 boundsIOArray (IOArray arr) = boundsOfArray arr
81 readIOArray (IOArray arr) ix = stToIO (readArray arr ix)
83 writeIOArray (IOArray arr) ix elt = stToIO (writeArray arr ix elt)
85 freezeIOArray (IOArray arr) = stToIO (freezeArray arr)