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|
{-# OPTIONS -XTypeOperators -XRank2Types -XFlexibleContexts #-}
-----------------------------------------------------------------------------
-- |
-- Module : Data.Packed.ST
-- Copyright : (c) Alberto Ruiz 2008
-- License : GPL-style
--
-- Maintainer : Alberto Ruiz <aruiz@um.es>
-- Stability : provisional
-- Portability : portable
--
-- In-place manipulation inside the ST monad.
-- See examples/inplace.hs in the distribution.
--
-----------------------------------------------------------------------------
module Data.Packed.ST (
-- * Mutable Vectors
STVector, newVector, thawVector, freezeVector, runSTVector,
readVector, writeVector, modifyVector, liftSTVector,
-- * Mutable Matrices
STMatrix, newMatrix, thawMatrix, freezeMatrix, runSTMatrix,
readMatrix, writeMatrix, modifyMatrix, liftSTMatrix,
-- * Unsafe functions
unsafeReadVector, unsafeWriteVector,
unsafeThawVector, unsafeFreezeVector,
unsafeReadMatrix, unsafeWriteMatrix,
unsafeThawMatrix, unsafeFreezeMatrix
) where
import Data.Packed.Internal
import Data.Array.Storable
import Control.Monad.ST
import Data.Array.ST
import Foreign
{-# INLINE ioReadV #-}
ioReadV :: Storable t => Vector t -> Int -> IO t
ioReadV v k = withForeignPtr (fptr v) $ \s -> peekElemOff s k
{-# INLINE ioWriteV #-}
ioWriteV :: Storable t => Vector t -> Int -> t -> IO ()
ioWriteV v k x = withForeignPtr (fptr v) $ \s -> pokeElemOff s k x
newtype STVector s t = STVector (Vector t)
thawVector :: Storable t => Vector t -> ST s (STVector s t)
thawVector = unsafeIOToST . fmap STVector . cloneVector
unsafeThawVector :: Storable t => Vector t -> ST s (STVector s t)
unsafeThawVector = unsafeIOToST . return . STVector
runSTVector :: Storable t => (forall s . ST s (STVector s t)) -> Vector t
runSTVector st = runST (st >>= unsafeFreezeVector)
{-# INLINE unsafeReadVector #-}
unsafeReadVector :: Storable t => STVector s t -> Int -> ST s t
unsafeReadVector (STVector x) = unsafeIOToST . ioReadV x
{-# INLINE unsafeWriteVector #-}
unsafeWriteVector :: Storable t => STVector s t -> Int -> t -> ST s ()
unsafeWriteVector (STVector x) k = unsafeIOToST . ioWriteV x k
{-# INLINE modifyVector #-}
modifyVector :: (Storable t) => STVector s t -> Int -> (t -> t) -> ST s ()
modifyVector x k f = readVector x k >>= return . f >>= unsafeWriteVector x k
liftSTVector :: (Storable t) => (Vector t -> a) -> STVector s1 t -> ST s2 a
liftSTVector f (STVector x) = unsafeIOToST . fmap f . cloneVector $ x
freezeVector :: (Storable t) => STVector s1 t -> ST s2 (Vector t)
freezeVector v = liftSTVector id v
unsafeFreezeVector :: (Storable t) => STVector s1 t -> ST s2 (Vector t)
unsafeFreezeVector (STVector x) = unsafeIOToST . return $ x
{-# INLINE safeIndexV #-}
safeIndexV f (STVector v) k
| k < 0 || k>= dim v = error $ "out of range error in vector (dim="
++show (dim v)++", pos="++show k++")"
| otherwise = f (STVector v) k
{-# INLINE readVector #-}
readVector :: Storable t => STVector s t -> Int -> ST s t
readVector = safeIndexV unsafeReadVector
{-# INLINE writeVector #-}
writeVector :: Storable t => STVector s t -> Int -> t -> ST s ()
writeVector = safeIndexV unsafeWriteVector
newVector :: Element t => t -> Int -> ST s (STVector s t)
newVector v = unsafeThawVector . constant v
-------------------------------------------------------------------------
{-# INLINE ioReadM #-}
ioReadM :: Storable t => Matrix t -> Int -> Int -> IO t
ioReadM (MC nr nc cv) r c = ioReadV cv (r*nc+c)
ioReadM (MF nr nc fv) r c = ioReadV fv (c*nr+r)
{-# INLINE ioWriteM #-}
ioWriteM :: Storable t => Matrix t -> Int -> Int -> t -> IO ()
ioWriteM (MC nr nc cv) r c val = ioWriteV cv (r*nc+c) val
ioWriteM (MF nr nc fv) r c val = ioWriteV fv (c*nr+r) val
newtype STMatrix s t = STMatrix (Matrix t)
thawMatrix :: Storable t => Matrix t -> ST s (STMatrix s t)
thawMatrix = unsafeIOToST . fmap STMatrix . cloneMatrix
unsafeThawMatrix :: Storable t => Matrix t -> ST s (STMatrix s t)
unsafeThawMatrix = unsafeIOToST . return . STMatrix
runSTMatrix :: Storable t => (forall s . ST s (STMatrix s t)) -> Matrix t
runSTMatrix st = runST (st >>= unsafeFreezeMatrix)
{-# INLINE unsafeReadMatrix #-}
unsafeReadMatrix :: Storable t => STMatrix s t -> Int -> Int -> ST s t
unsafeReadMatrix (STMatrix x) r = unsafeIOToST . ioReadM x r
{-# INLINE unsafeWriteMatrix #-}
unsafeWriteMatrix :: Storable t => STMatrix s t -> Int -> Int -> t -> ST s ()
unsafeWriteMatrix (STMatrix x) r c = unsafeIOToST . ioWriteM x r c
{-# INLINE modifyMatrix #-}
modifyMatrix :: (Storable t) => STMatrix s t -> Int -> Int -> (t -> t) -> ST s ()
modifyMatrix x r c f = readMatrix x r c >>= return . f >>= unsafeWriteMatrix x r c
liftSTMatrix :: (Storable t) => (Matrix t -> a) -> STMatrix s1 t -> ST s2 a
liftSTMatrix f (STMatrix x) = unsafeIOToST . fmap f . cloneMatrix $ x
unsafeFreezeMatrix :: (Storable t) => STMatrix s1 t -> ST s2 (Matrix t)
unsafeFreezeMatrix (STMatrix x) = unsafeIOToST . return $ x
freezeMatrix :: (Storable t) => STMatrix s1 t -> ST s2 (Matrix t)
freezeMatrix m = liftSTMatrix id m
cloneMatrix (MC r c d) = cloneVector d >>= return . MC r c
cloneMatrix (MF r c d) = cloneVector d >>= return . MF r c
{-# INLINE safeIndexM #-}
safeIndexM f (STMatrix m) r c
| r<0 || r>=rows m ||
c<0 || c>=cols m = error $ "out of range error in matrix (size="
++show (rows m,cols m)++", pos="++show (r,c)++")"
| otherwise = f (STMatrix m) r c
{-# INLINE readMatrix #-}
readMatrix :: Storable t => STMatrix s t -> Int -> Int -> ST s t
readMatrix = safeIndexM unsafeReadMatrix
{-# INLINE writeMatrix #-}
writeMatrix :: Storable t => STMatrix s t -> Int -> Int -> t -> ST s ()
writeMatrix = safeIndexM unsafeWriteMatrix
newMatrix :: Element t => t -> Int -> Int -> ST s (STMatrix s t)
newMatrix v r c = unsafeThawMatrix . reshape c . constant v $ r*c
|
