{-# LANGUAGE MultiParamTypeClasses, FlexibleInstances, ScopedTypeVariables #-} -- | -- Module : Data.Vector.Primitive.Mutable -- Copyright : (c) Roman Leshchinskiy 2008-2010 -- License : BSD-style -- -- Maintainer : Roman Leshchinskiy <rl@cse.unsw.edu.au> -- Stability : experimental -- Portability : non-portable -- -- Mutable primitive vectors. -- module Data.Vector.Primitive.Mutable ( -- * Mutable vectors of primitive types MVector(..), IOVector, STVector, Prim, -- * Accessors -- ** Length information length, null, -- ** Extracting subvectors slice, init, tail, take, drop, splitAt, unsafeSlice, unsafeInit, unsafeTail, unsafeTake, unsafeDrop, -- ** Overlapping overlaps, -- * Construction -- ** Initialisation new, unsafeNew, replicate, replicateM, clone, -- ** Growing grow, unsafeGrow, -- ** Restricting memory usage clear, -- * Accessing individual elements read, write, swap, unsafeRead, unsafeWrite, unsafeSwap, -- * Modifying vectors -- ** Filling and copying set, copy, move, unsafeCopy, unsafeMove ) where import qualified Data.Vector.Generic.Mutable as G import Data.Primitive.ByteArray import Data.Primitive ( Prim, sizeOf ) import Control.Monad.Primitive import Control.Monad ( liftM ) import Prelude hiding ( length, null, replicate, reverse, map, read, take, drop, splitAt, init, tail ) import Data.Typeable ( Typeable ) #include "vector.h" -- | Mutable vectors of primitive types. data MVector s a = MVector {-# UNPACK #-} !Int {-# UNPACK #-} !Int {-# UNPACK #-} !(MutableByteArray s) deriving ( Typeable ) type IOVector = MVector RealWorld type STVector s = MVector s instance Prim a => G.MVector MVector a where basicLength (MVector _ n _) = n basicUnsafeSlice j m (MVector i n arr) = MVector (i+j) m arr {-# INLINE basicOverlaps #-} basicOverlaps (MVector i m arr1) (MVector j n arr2) = sameMutableByteArray 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 = MVector 0 n `liftM` newByteArray (n * sizeOf (undefined :: a)) {-# INLINE basicUnsafeRead #-} basicUnsafeRead (MVector i n arr) j = readByteArray arr (i+j) {-# INLINE basicUnsafeWrite #-} basicUnsafeWrite (MVector i n arr) j x = writeByteArray arr (i+j) x {-# INLINE basicUnsafeCopy #-} basicUnsafeCopy (MVector i n dst) (MVector j _ src) = copyMutableByteArray dst (i*sz) src (j*sz) (n*sz) where sz = sizeOf (undefined :: a) {-# INLINE basicUnsafeMove #-} basicUnsafeMove (MVector i n dst) (MVector j _ src) = moveByteArray dst (i*sz) src (j*sz) (n * sz) where sz = sizeOf (undefined :: a) -- Length information -- ------------------ -- | Length of the mutable vector. length :: Prim a => MVector s a -> Int {-# INLINE length #-} length = G.length -- | Check whether the vector is empty null :: Prim a => MVector s a -> Bool {-# INLINE null #-} null = G.null -- Extracting subvectors -- --------------------- -- | Yield a part of the mutable vector without copying it. slice :: Prim a => Int -> Int -> MVector s a -> MVector s a {-# INLINE slice #-} slice = G.slice take :: Prim a => Int -> MVector s a -> MVector s a {-# INLINE take #-} take = G.take drop :: Prim a => Int -> MVector s a -> MVector s a {-# INLINE drop #-} drop = G.drop splitAt :: Prim a => Int -> MVector s a -> (MVector s a, MVector s a) {-# INLINE splitAt #-} splitAt = G.splitAt init :: Prim a => MVector s a -> MVector s a {-# INLINE init #-} init = G.init tail :: Prim a => MVector s a -> MVector s a {-# INLINE tail #-} tail = G.tail -- | Yield a part of the mutable vector without copying it. No bounds checks -- are performed. unsafeSlice :: Prim a => Int -- ^ starting index -> Int -- ^ length of the slice -> MVector s a -> MVector s a {-# INLINE unsafeSlice #-} unsafeSlice = G.unsafeSlice unsafeTake :: Prim a => Int -> MVector s a -> MVector s a {-# INLINE unsafeTake #-} unsafeTake = G.unsafeTake unsafeDrop :: Prim a => Int -> MVector s a -> MVector s a {-# INLINE unsafeDrop #-} unsafeDrop = G.unsafeDrop unsafeInit :: Prim a => MVector s a -> MVector s a {-# INLINE unsafeInit #-} unsafeInit = G.unsafeInit unsafeTail :: Prim a => MVector s a -> MVector s a {-# INLINE unsafeTail #-} unsafeTail = G.unsafeTail -- Overlapping -- ----------- -- Check whether two vectors overlap. overlaps :: Prim a => MVector s a -> MVector s a -> Bool {-# INLINE overlaps #-} overlaps = G.overlaps -- Initialisation -- -------------- -- | Create a mutable vector of the given length. new :: (PrimMonad m, Prim a) => Int -> m (MVector (PrimState m) a) {-# INLINE new #-} new = G.new -- | Create a mutable vector of the given length. The length is not checked. unsafeNew :: (PrimMonad m, Prim a) => Int -> m (MVector (PrimState m) a) {-# INLINE unsafeNew #-} unsafeNew = G.unsafeNew -- | Create a mutable vector of the given length (0 if the length is negative) -- and fill it with an initial value. replicate :: (PrimMonad m, Prim a) => Int -> a -> m (MVector (PrimState m) a) {-# INLINE replicate #-} replicate = G.replicate -- | Create a mutable vector of the given length (0 if the length is negative) -- and fill it with values produced by repeatedly executing the monadic action. replicateM :: (PrimMonad m, Prim a) => Int -> m a -> m (MVector (PrimState m) a) {-# INLINE replicateM #-} replicateM = G.replicateM -- | Create a copy of a mutable vector. clone :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> m (MVector (PrimState m) a) {-# INLINE clone #-} clone = G.clone -- Growing -- ------- -- | Grow a vector by the given number of elements. The number must be -- positive. grow :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> Int -> m (MVector (PrimState m) a) {-# INLINE grow #-} grow = G.grow -- | Grow a vector by the given number of elements. The number must be -- positive but this is not checked. unsafeGrow :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> Int -> m (MVector (PrimState m) a) {-# INLINE unsafeGrow #-} unsafeGrow = G.unsafeGrow -- Restricting memory usage -- ------------------------ -- | 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, Prim a) => MVector (PrimState m) a -> m () {-# INLINE clear #-} clear = G.clear -- Accessing individual elements -- ----------------------------- -- | Yield the element at the given position. read :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> Int -> m a {-# INLINE read #-} read = G.read -- | Replace the element at the given position. write :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> Int -> a -> m () {-# INLINE write #-} write = G.write -- | Swap the elements at the given positions. swap :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> Int -> Int -> m () {-# INLINE swap #-} swap = G.swap -- | Yield the element at the given position. No bounds checks are performed. unsafeRead :: (PrimMonad m, Prim a) => 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, Prim a) => 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, Prim a) => MVector (PrimState m) a -> Int -> Int -> m () {-# INLINE unsafeSwap #-} unsafeSwap = G.unsafeSwap -- Filling and copying -- ------------------- -- | Set all elements of the vector to the given value. set :: (PrimMonad m, Prim a) => 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, Prim a) => MVector (PrimState m) a -> MVector (PrimState m) a -> m () {-# INLINE copy #-} copy = G.copy -- | Copy a vector. The two vectors must have the same length and may not -- overlap. This is not checked. unsafeCopy :: (PrimMonad m, Prim a) => MVector (PrimState m) a -- ^ target -> MVector (PrimState m) a -- ^ source -> m () {-# INLINE unsafeCopy #-} unsafeCopy = G.unsafeCopy -- | Move the contents of a vector. The two vectors must have the same -- length. -- -- If the vectors do not overlap, then this is equivalent to 'copy'. -- Otherwise, the copying is performed as if the source vector were -- copied to a temporary vector and then the temporary vector was copied -- to the target vector. move :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> MVector (PrimState m) a -> m () {-# INLINE move #-} move = G.move -- | Move the contents of a vector. The two vectors must have the same -- length, but this is not checked. -- -- If the vectors do not overlap, then this is equivalent to 'unsafeCopy'. -- Otherwise, the copying is performed as if the source vector were -- copied to a temporary vector and then the temporary vector was copied -- to the target vector. unsafeMove :: (PrimMonad m, Prim a) => MVector (PrimState m) a -- ^ target -> MVector (PrimState m) a -- ^ source -> m () {-# INLINE unsafeMove #-} unsafeMove = G.unsafeMove