288343ee4c3149860a44183e5e786982a23192a5
[packages/base.git] / Data / STRef / Lazy.hs
1 -----------------------------------------------------------------------------
2 -- |
3 -- Module : Data.STRef.Lazy
4 -- Copyright : (c) The University of Glasgow 2001
5 -- License : BSD-style (see the file libraries/base/LICENSE)
6 --
7 -- Maintainer : libraries@haskell.org
8 -- Stability : experimental
9 -- Portability : non-portable (uses Control.Monad.ST.Lazy)
10 --
11 -- Mutable references in the lazy ST monad.
12 --
13 -----------------------------------------------------------------------------
14 module Data.STRef.Lazy (
15 -- * STRefs
16 ST.STRef, -- abstract, instance Eq
17 newSTRef, -- :: a -> ST s (STRef s a)
18 readSTRef, -- :: STRef s a -> ST s a
19 writeSTRef, -- :: STRef s a -> a -> ST s ()
20 modifySTRef -- :: STRef s a -> (a -> a) -> ST s ()
21 ) where
22
23 import Control.Monad.ST.Lazy
24 import qualified Data.STRef as ST
25 import Prelude
26
27 newSTRef :: a -> ST s (ST.STRef s a)
28 readSTRef :: ST.STRef s a -> ST s a
29 writeSTRef :: ST.STRef s a -> a -> ST s ()
30 modifySTRef :: ST.STRef s a -> (a -> a) -> ST s ()
31
32 newSTRef = strictToLazyST . ST.newSTRef
33 readSTRef = strictToLazyST . ST.readSTRef
34 writeSTRef r a = strictToLazyST (ST.writeSTRef r a)
35 modifySTRef r f = strictToLazyST (ST.modifySTRef r f)