{-# LANGUAGE CPP, DeriveDataTypeable, 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, modify, swap,
unsafeRead, unsafeWrite, unsafeModify, unsafeSwap,
-- * Modifying vectors
nextPermutation,
-- ** 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 Data.Word ( Word8 )
import Control.Monad.Primitive
import Control.Monad ( liftM )
import Control.DeepSeq ( NFData(rnf) )
import Prelude hiding ( length, null, replicate, reverse, map, read,
take, drop, splitAt, init, tail )
import Data.Typeable ( Typeable )
-- Data.Vector.Internal.Check is unnecessary
#define NOT_VECTOR_MODULE
#include "vector.h"
-- | Mutable vectors of primitive types.
data MVector s a = MVector {-# UNPACK #-} !Int
{-# UNPACK #-} !Int
{-# UNPACK #-} !(MutableByteArray s) -- ^ offset, length, underlying mutable byte array
deriving ( Typeable )
type IOVector = MVector RealWorld
type STVector s = MVector s
instance NFData (MVector s a) where
rnf (MVector _ _ _) = ()
instance Prim a => G.MVector MVector a where
basicLength (MVector _ n _) = n
basicUnsafeSlice j m (MVector i _ 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
| n < 0 = error $ "Primitive.basicUnsafeNew: negative length: " ++ show n
| n > mx = error $ "Primitive.basicUnsafeNew: length to large: " ++ show n
| otherwise = MVector 0 n `liftM` newByteArray (n * size)
where
size = sizeOf (undefined :: a)
mx = maxBound `div` size :: Int
{-# INLINE basicInitialize #-}
basicInitialize (MVector off n v) =
setByteArray v (off * size) (n * size) (0 :: Word8)
where
size = sizeOf (undefined :: a)
{-# INLINE basicUnsafeRead #-}
basicUnsafeRead (MVector i _ arr) j = readByteArray arr (i+j)
{-# INLINE basicUnsafeWrite #-}
basicUnsafeWrite (MVector i _ 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)
{-# INLINE basicSet #-}
basicSet (MVector i n arr) x = setByteArray arr i n x
-- 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 memory is not initialized.
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
-- | Modify the element at the given position.
modify :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> (a -> a) -> Int -> m ()
{-# INLINE modify #-}
modify = G.modify
-- | 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
-- | Modify the element at the given position. No bounds checks are performed.
unsafeModify :: (PrimMonad m, Prim a) => MVector (PrimState m) a -> (a -> a) -> Int -> m ()
{-# INLINE unsafeModify #-}
unsafeModify = G.unsafeModify
-- | 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 -- ^ target
-> MVector (PrimState m) a -- ^ source
-> 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
-- | Compute the next (lexicographically) permutation of given vector in-place.
-- Returns False when input is the last permtuation
nextPermutation :: (PrimMonad m,Ord e,Prim e) => MVector (PrimState m) e -> m Bool
{-# INLINE nextPermutation #-}
nextPermutation = G.nextPermutation