{-# LANGUAGE MultiParamTypeClasses, FlexibleInstances, TypeFamilies #-} -- | -- Module : Data.Vector.Mutable -- Copyright : (c) Roman Leshchinskiy 2008-2009 -- License : BSD-style -- -- Maintainer : Roman Leshchinskiy <rl@cse.unsw.edu.au> -- Stability : experimental -- Portability : non-portable -- -- Mutable boxed vectors. -- module Data.Vector.Mutable ( -- * Mutable boxed vectors MVector(..), IOVector, STVector, -- * Operations on mutable vectors length, overlaps, slice, new, newWith, read, write, swap, clear, set, copy, grow, -- * Unsafe operations unsafeSlice, unsafeNew, unsafeNewWith, unsafeRead, unsafeWrite, unsafeCopy, unsafeGrow ) where import qualified Data.Vector.Generic.Mutable as G import Data.Primitive.Array import Control.Monad.Primitive import Control.Monad.ST ( ST ) import Prelude hiding ( length, read ) #include "vector.h" -- | Mutable boxed vectors keyed on the monad they live in ('IO' or @'ST' s@). data MVector s a = MVector {-# UNPACK #-} !Int {-# UNPACK #-} !Int {-# UNPACK #-} !(MutableArray s a) type IOVector = MVector RealWorld type STVector s = MVector s instance G.MVector MVector a where {-# INLINE basicLength #-} basicLength (MVector _ n _) = n {-# INLINE basicUnsafeSlice #-} basicUnsafeSlice j m (MVector i n arr) = MVector (i+j) m arr {-# INLINE basicOverlaps #-} basicOverlaps (MVector i m arr1) (MVector j n arr2) = sameMutableArray arr1 arr2 && (between i j (j+n) || between j i (i+m)) where between x y z = x >= y && x < z {-# INLINE basicUnsafeNew #-} basicUnsafeNew n = do arr <- newArray n uninitialised return (MVector 0 n arr) {-# INLINE basicUnsafeNewWith #-} basicUnsafeNewWith n x = do arr <- newArray n x return (MVector 0 n arr) {-# INLINE basicUnsafeRead #-} basicUnsafeRead (MVector i n arr) j = readArray arr (i+j) {-# INLINE basicUnsafeWrite #-} basicUnsafeWrite (MVector i n arr) j x = writeArray arr (i+j) x {-# INLINE basicClear #-} basicClear v = G.set v uninitialised uninitialised :: a uninitialised = error "Data.Vector.Mutable: uninitialised element" -- | Yield a part of the mutable vector without copying it. No bounds checks -- are performed. unsafeSlice :: Int -- ^ starting index -> Int -- ^ length of the slice -> MVector s a -> MVector s a {-# INLINE unsafeSlice #-} unsafeSlice = G.unsafeSlice -- | Create a mutable vector of the given length. The length is not checked. unsafeNew :: PrimMonad m => Int -> m (MVector (PrimState m) a) {-# INLINE unsafeNew #-} unsafeNew = G.unsafeNew -- | Create a mutable vector of the given length and fill it with an -- initial value. The length is not checked. unsafeNewWith :: PrimMonad m => Int -> a -> m (MVector (PrimState m) a) {-# INLINE unsafeNewWith #-} unsafeNewWith = G.unsafeNewWith -- | Yield the element at the given position. No bounds checks are performed. unsafeRead :: PrimMonad m => MVector (PrimState m) a -> Int -> m a {-# INLINE unsafeRead #-} unsafeRead = G.unsafeRead -- | Replace the element at the given position. No bounds checks are performed. unsafeWrite :: PrimMonad m => MVector (PrimState m) a -> Int -> a -> m () {-# INLINE unsafeWrite #-} unsafeWrite = G.unsafeWrite -- | Swap the elements at the given positions. No bounds checks are performed. unsafeSwap :: PrimMonad m => MVector (PrimState m) a -> Int -> Int -> m () {-# INLINE unsafeSwap #-} unsafeSwap = G.unsafeSwap -- | Copy a vector. The two vectors must have the same length and may not -- overlap. This is not checked. unsafeCopy :: PrimMonad m => MVector (PrimState m) a -- ^ target -> MVector (PrimState m) a -- ^ source -> m () {-# INLINE unsafeCopy #-} unsafeCopy = G.unsafeCopy -- | Grow a vector by the given number of elements. The number must be -- positive but this is not checked. unsafeGrow :: PrimMonad m => MVector (PrimState m) a -> Int -> m (MVector (PrimState m) a) {-# INLINE unsafeGrow #-} unsafeGrow = G.unsafeGrow -- | Length of the mutable vector. length :: MVector s a -> Int {-# INLINE length #-} length = G.length -- Check whether two vectors overlap. overlaps :: MVector s a -> MVector s a -> Bool {-# INLINE overlaps #-} overlaps = G.overlaps -- | Yield a part of the mutable vector without copying it. slice :: Int -> Int -> MVector s a -> MVector s a {-# INLINE slice #-} slice = G.slice -- | Create a mutable vector of the given length. new :: PrimMonad m => Int -> m (MVector (PrimState m) a) {-# INLINE new #-} new = G.new -- | Create a mutable vector of the given length and fill it with an -- initial value. newWith :: PrimMonad m => Int -> a -> m (MVector (PrimState m) a) {-# INLINE newWith #-} newWith = G.newWith -- | Yield the element at the given position. read :: PrimMonad m => MVector (PrimState m) a -> Int -> m a {-# INLINE read #-} read = G.read -- | Replace the element at the given position. write :: PrimMonad m => MVector (PrimState m) a -> Int -> a -> m () {-# INLINE write #-} write = G.write -- | Swap the elements at the given positions. swap :: PrimMonad m => MVector (PrimState m) a -> Int -> Int -> m () {-# INLINE swap #-} swap = G.swap -- | Reset all elements of the vector to some undefined value, clearing all -- references to external objects. This is usually a noop for unboxed vectors. clear :: PrimMonad m => MVector (PrimState m) a -> m () {-# INLINE clear #-} clear = G.clear -- | Set all elements of the vector to the given value. set :: PrimMonad m => MVector (PrimState m) a -> a -> m () {-# INLINE set #-} set = G.set -- | Copy a vector. The two vectors must have the same length and may not -- overlap. copy :: PrimMonad m => MVector (PrimState m) a -> MVector (PrimState m) a -> m () {-# INLINE copy #-} copy = G.copy -- | Grow a vector by the given number of elements. The number must be -- positive. grow :: PrimMonad m => MVector (PrimState m) a -> Int -> m (MVector (PrimState m) a) {-# INLINE grow #-} grow = G.grow