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[project @ 2003-08-23 00:08:02 by sof]
[ghc-base.git]
/
Data
/
STRef.hs
diff --git
a/Data/STRef.hs
b/Data/STRef.hs
index
2331ef9
..
3edfb87
100644
(file)
--- a/
Data/STRef.hs
+++ b/
Data/STRef.hs
@@
-8,11
+8,12
@@
-- Stability : experimental
-- Portability : non-portable (requires non-portable module ST)
--
-- Stability : experimental
-- Portability : non-portable (requires non-portable module ST)
--
--- Mutable references in the ST monad.
+-- Mutable references in the (strict) ST monad.
--
-----------------------------------------------------------------------------
module Data.STRef (
--
-----------------------------------------------------------------------------
module Data.STRef (
+ -- * STRefs
STRef, -- abstract, instance Eq
newSTRef, -- :: a -> ST s (STRef s a)
readSTRef, -- :: STRef s a -> ST s a
STRef, -- abstract, instance Eq
newSTRef, -- :: a -> ST s (STRef s a)
readSTRef, -- :: STRef s a -> ST s a
@@
-23,10
+24,19
@@
module Data.STRef (
import Prelude
#ifdef __GLASGOW_HASKELL__
import Prelude
#ifdef __GLASGOW_HASKELL__
+import GHC.ST
import GHC.STRef
#endif
import GHC.STRef
#endif
-import Data.Dynamic
+#ifdef __HUGS__
+import Hugs.ST
+#endif
+
+import Data.Typeable
-#include "Dynamic.h"
+#include "Typeable.h"
INSTANCE_TYPEABLE2(STRef,stRefTc,"STRef")
INSTANCE_TYPEABLE2(STRef,stRefTc,"STRef")
+
+-- |Mutate the contents of an 'STRef'
+modifySTRef :: STRef s a -> (a -> a) -> ST s ()
+modifySTRef ref f = writeSTRef ref . f =<< readSTRef ref