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 import PrelHandle ( openFileEx, IOModeEx(..) )
51 reallyUnsafePtrEq a b =
52 case reallyUnsafePtrEquality# a b of
58 newtype IORef a = IORef (MutableVar RealWorld a)
61 newIORef :: a -> IO (IORef a)
62 newIORef v = stToIO (newVar v) >>= \ var -> return (IORef var)
64 readIORef :: IORef a -> IO a
65 readIORef (IORef var) = stToIO (readVar var)
67 writeIORef :: IORef a -> a -> IO ()
68 writeIORef (IORef var) v = stToIO (writeVar var v)
72 newtype IOArray ix elt = IOArray (MutableArray RealWorld ix elt)
75 newIOArray :: Ix ix => (ix,ix) -> elt -> IO (IOArray ix elt)
76 boundsIOArray :: Ix ix => IOArray ix elt -> (ix, ix)
77 readIOArray :: Ix ix => IOArray ix elt -> ix -> IO elt
78 writeIOArray :: Ix ix => IOArray ix elt -> ix -> elt -> IO ()
79 freezeIOArray :: Ix ix => IOArray ix elt -> IO (Array ix elt)
82 stToIO (newArray ixs elt) >>= \arr ->
85 boundsIOArray (IOArray arr) = boundsOfArray arr
87 readIOArray (IOArray arr) ix = stToIO (readArray arr ix)
89 writeIOArray (IOArray arr) ix elt = stToIO (writeArray arr ix elt)
91 freezeIOArray (IOArray arr) = stToIO (freezeArray arr)
95 setEcho :: Handle -> Bool -> IO ()
98 getEcho :: Handle -> IO Bool