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|
{-# OPTIONS -cpp #-}
--
-- (c) The University of Glasgow 2002-2006
--
-- Unboxed mutable Ints
\begin{code}
module FastMutInt(
FastMutInt, newFastMutInt,
readFastMutInt, writeFastMutInt
) where
#include "MachDeps.h"
#ifndef SIZEOF_HSINT
#define SIZEOF_HSINT INT_SIZE_IN_BYTES
#endif
import GHC.Base
import GHC.IOBase
\end{code}
\begin{code}
#ifdef __GLASGOW_HASKELL__
data FastMutInt = FastMutInt (MutableByteArray# RealWorld)
newFastMutInt :: IO FastMutInt
newFastMutInt = IO $ \s ->
case newByteArray# size s of { (# s, arr #) ->
(# s, FastMutInt arr #) }
where I# size = SIZEOF_HSINT
readFastMutInt :: FastMutInt -> IO Int
readFastMutInt (FastMutInt arr) = IO $ \s ->
case readIntArray# arr 0# s of { (# s, i #) ->
(# s, I# i #) }
writeFastMutInt :: FastMutInt -> Int -> IO ()
writeFastMutInt (FastMutInt arr) (I# i) = IO $ \s ->
case writeIntArray# arr 0# i s of { s ->
(# s, () #) }
\end{code}
#endif
|
