Data.Primitive.Array

primitive-0.9.0.0: Primitive memory-related operations

Copyright | (c) Roman Leshchinskiy 2009-2012
License | BSD-style
Maintainer | Roman Leshchinskiy <rl@cse.unsw.edu.au>
Portability | non-portable
Safe Haskell | Safe-Inferred
Language | Haskell2010

Data.Primitive.Array

Description

Primitive arrays of boxed values.

Synopsis

- data Array a = Array {
  - array# :: Array# a
  }
- data MutableArray s a = MutableArray {
  - marray# :: MutableArray# s a
  }
- newArray :: PrimMonad m => Int -> a -> m (MutableArray (PrimState m) a)
- readArray :: PrimMonad m => MutableArray (PrimState m) a -> Int -> m a
- writeArray :: PrimMonad m => MutableArray (PrimState m) a -> Int -> a -> m ()
- indexArray :: Array a -> Int -> a
- indexArrayM :: Applicative m => Array a -> Int -> m a
- indexArray## :: Array a -> Int -> (# a #)
- freezeArray :: PrimMonad m => MutableArray (PrimState m) a -> Int -> Int -> m (Array a)
- thawArray :: PrimMonad m => Array a -> Int -> Int -> m (MutableArray (PrimState m) a)
- runArray :: (forall s. ST s (MutableArray s a)) -> Array a
- createArray :: Int -> a -> (forall s. MutableArray s a -> ST s ()) -> Array a
- unsafeFreezeArray :: PrimMonad m => MutableArray (PrimState m) a -> m (Array a)
- unsafeThawArray :: PrimMonad m => Array a -> m (MutableArray (PrimState m) a)
- sameMutableArray :: MutableArray s a -> MutableArray s a -> Bool
- copyArray :: PrimMonad m => MutableArray (PrimState m) a -> Int -> Array a -> Int -> Int -> m ()
- copyMutableArray :: PrimMonad m => MutableArray (PrimState m) a -> Int -> MutableArray (PrimState m) a -> Int -> Int -> m ()
- cloneArray :: Array a -> Int -> Int -> Array a
- cloneMutableArray :: PrimMonad m => MutableArray (PrimState m) a -> Int -> Int -> m (MutableArray (PrimState m) a)
- sizeofArray :: Array a -> Int
- sizeofMutableArray :: MutableArray s a -> Int
- emptyArray :: Array a
- arrayFromListN :: Int -> [a] -> Array a
- arrayFromList :: [a] -> Array a
- mapArray' :: (a -> b) -> Array a -> Array b
- traverseArrayP :: PrimMonad m => (a -> m b) -> Array a -> m (Array b)

# Documentation

data Array a #

Boxed arrays.

Constructors

Array |
Fields array# :: Array# a

#### Instances

Instances details

MonadFail Array # |
Instance details Defined in Data.Primitive.Array Methods fail :: String -> Array a
MonadFix Array # |
Instance details Defined in Data.Primitive.Array Methods mfix :: (a -> Array a) -> Array a
MonadZip Array # |
Instance details Defined in Data.Primitive.Array Methods mzip :: Array a -> Array b -> Array (a, b) mzipWith :: (a -> b -> c) -> Array a -> Array b -> Array c munzip :: Array (a, b) -> (Array a, Array b)
Foldable Array # |
Instance details Defined in Data.Primitive.Array Methods fold :: Monoid m => Array m -> m foldMap :: Monoid m => (a -> m) -> Array a -> m foldMap' :: Monoid m => (a -> m) -> Array a -> m foldr :: (a -> b -> b) -> b -> Array a -> b foldr' :: (a -> b -> b) -> b -> Array a -> b foldl :: (b -> a -> b) -> b -> Array a -> b foldl' :: (b -> a -> b) -> b -> Array a -> b foldr1 :: (a -> a -> a) -> Array a -> a foldl1 :: (a -> a -> a) -> Array a -> a toList :: Array a -> [a] null :: Array a -> Bool length :: Array a -> Int elem :: Eq a => a -> Array a -> Bool maximum :: Ord a => Array a -> a minimum :: Ord a => Array a -> a sum :: Num a => Array a -> a product :: Num a => Array a -> a
Eq1 Array # | Since: 0.6.4.0
Instance details Defined in Data.Primitive.Array Methods liftEq :: (a -> b -> Bool) -> Array a -> Array b -> Bool
Ord1 Array # | Since: 0.6.4.0
Instance details Defined in Data.Primitive.Array Methods liftCompare :: (a -> b -> Ordering) -> Array a -> Array b -> Ordering
Read1 Array # | Since: 0.6.4.0
Instance details Defined in Data.Primitive.Array Methods liftReadsPrec :: (Int -> ReadS a) -> ReadS [a] -> Int -> ReadS (Array a) liftReadList :: (Int -> ReadS a) -> ReadS [a] -> ReadS [Array a] liftReadPrec :: ReadPrec a -> ReadPrec [a] -> ReadPrec (Array a) liftReadListPrec :: ReadPrec a -> ReadPrec [a] -> ReadPrec [Array a]
Show1 Array # | Since: 0.6.4.0
Instance details Defined in Data.Primitive.Array Methods liftShowsPrec :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> Int -> Array a -> ShowS liftShowList :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> [Array a] -> ShowS
Traversable Array # |
Instance details Defined in Data.Primitive.Array Methods traverse :: Applicative f => (a -> f b) -> Array a -> f (Array b) sequenceA :: Applicative f => Array (f a) -> f (Array a) mapM :: Monad m => (a -> m b) -> Array a -> m (Array b) sequence :: Monad m => Array (m a) -> m (Array a)
Alternative Array # |
Instance details Defined in Data.Primitive.Array Methods empty :: Array a (<|>) :: Array a -> Array a -> Array a some :: Array a -> Array [a] many :: Array a -> Array [a]
Applicative Array # |
Instance details Defined in Data.Primitive.Array Methods pure :: a -> Array a (<*>) :: Array (a -> b) -> Array a -> Array b liftA2 :: (a -> b -> c) -> Array a -> Array b -> Array c (*>) :: Array a -> Array b -> Array b (<*) :: Array a -> Array b -> Array a
Functor Array # |
Instance details Defined in Data.Primitive.Array Methods fmap :: (a -> b) -> Array a -> Array b (<$) :: a -> Array b -> Array a
Monad Array # |
Instance details Defined in Data.Primitive.Array Methods (>>=) :: Array a -> (a -> Array b) -> Array b (>>) :: Array a -> Array b -> Array b return :: a -> Array a
MonadPlus Array # |
Instance details Defined in Data.Primitive.Array Methods mzero :: Array a mplus :: Array a -> Array a -> Array a
NFData1 Array # |
Instance details Defined in Data.Primitive.Array Methods liftRnf :: (a -> ()) -> Array a -> ()
Lift a => Lift (Array a :: Type) # |
Instance details Defined in Data.Primitive.Array Methods lift :: Quote m => Array a -> m Exp liftTyped :: forall (m :: Type -> Type). Quote m => Array a -> Code m (Array a)
Data a => Data (Array a) # |
Instance details Defined in Data.Primitive.Array Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Array a -> c (Array a) gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (Array a) toConstr :: Array a -> Constr dataTypeOf :: Array a -> DataType dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (Array a)) dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (Array a)) gmapT :: (forall b. Data b => b -> b) -> Array a -> Array a gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Array a -> r gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Array a -> r gmapQ :: (forall d. Data d => d -> u) -> Array a -> [u] gmapQi :: Int -> (forall d. Data d => d -> u) -> Array a -> u gmapM :: Monad m => (forall d. Data d => d -> m d) -> Array a -> m (Array a) gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Array a -> m (Array a) gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Array a -> m (Array a)
Monoid (Array a) # |
Instance details Defined in Data.Primitive.Array Methods mempty :: Array a mappend :: Array a -> Array a -> Array a mconcat :: [Array a] -> Array a
Semigroup (Array a) # | Since: 0.6.3.0
Instance details Defined in Data.Primitive.Array Methods (<>) :: Array a -> Array a -> Array a sconcat :: NonEmpty (Array a) -> Array a stimes :: Integral b => b -> Array a -> Array a
IsList (Array a) # |
Instance details Defined in Data.Primitive.Array Associated Types type Item (Array a) Methods fromList :: [Item (Array a)] -> Array a fromListN :: Int -> [Item (Array a)] -> Array a toList :: Array a -> [Item (Array a)]
Read a => Read (Array a) # |
Instance details Defined in Data.Primitive.Array Methods readsPrec :: Int -> ReadS (Array a) readList :: ReadS [Array a] readPrec :: ReadPrec (Array a) readListPrec :: ReadPrec [Array a]
Show a => Show (Array a) # |
Instance details Defined in Data.Primitive.Array Methods showsPrec :: Int -> Array a -> ShowS show :: Array a -> String showList :: [Array a] -> ShowS
NFData a => NFData (Array a) # |
Instance details Defined in Data.Primitive.Array Methods rnf :: Array a -> ()
Eq a => Eq (Array a) # |
Instance details Defined in Data.Primitive.Array Methods (==) :: Array a -> Array a -> Bool (/=) :: Array a -> Array a -> Bool
Ord a => Ord (Array a) # | Lexicographic ordering. Subject to change between major versions.
Instance details Defined in Data.Primitive.Array Methods compare :: Array a -> Array a -> Ordering (<) :: Array a -> Array a -> Bool (<=) :: Array a -> Array a -> Bool (>) :: Array a -> Array a -> Bool (>=) :: Array a -> Array a -> Bool max :: Array a -> Array a -> Array a min :: Array a -> Array a -> Array a
type Item (Array a) # |
Instance details Defined in Data.Primitive.Array type Item (Array a) = a

data MutableArray s a #

Mutable boxed arrays associated with a primitive state token.

Constructors

MutableArray |
Fields marray# :: MutableArray# s a

#### Instances

Instances details

(Typeable s, Typeable a) => Data (MutableArray s a) # |
Instance details Defined in Data.Primitive.Array Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> MutableArray s a -> c (MutableArray s a) gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (MutableArray s a) toConstr :: MutableArray s a -> Constr dataTypeOf :: MutableArray s a -> DataType dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (MutableArray s a)) dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (MutableArray s a)) gmapT :: (forall b. Data b => b -> b) -> MutableArray s a -> MutableArray s a gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> MutableArray s a -> r gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> MutableArray s a -> r gmapQ :: (forall d. Data d => d -> u) -> MutableArray s a -> [u] gmapQi :: Int -> (forall d. Data d => d -> u) -> MutableArray s a -> u gmapM :: Monad m => (forall d. Data d => d -> m d) -> MutableArray s a -> m (MutableArray s a) gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> MutableArray s a -> m (MutableArray s a) gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> MutableArray s a -> m (MutableArray s a)
Eq (MutableArray s a) # |
Instance details Defined in Data.Primitive.Array Methods (==) :: MutableArray s a -> MutableArray s a -> Bool (/=) :: MutableArray s a -> MutableArray s a -> Bool

newArray :: PrimMonad m => Int -> a -> m (MutableArray (PrimState m) a) #

Create a new mutable array of the specified size and initialise all elements with the given value.

Note: this function does not check if the input is non-negative.

readArray :: PrimMonad m => MutableArray (PrimState m) a -> Int -> m a #

Read a value from the array at the given index.

Note: this function does not do bounds checking.

writeArray :: PrimMonad m => MutableArray (PrimState m) a -> Int -> a -> m () #

Write a value to the array at the given index.

Note: this function does not do bounds checking.

indexArray :: Array a -> Int -> a #

Read a value from the immutable array at the given index.

Note: this function does not do bounds checking.

indexArrayM :: Applicative m => Array a -> Int -> m a #

Read a value from the immutable array at the given index using an applicative. This allows us to be strict in the array while remaining lazy in the read element which is very useful for collective operations. Suppose we want to copy an array. We could do something like this:

    copy marr arr ... = do ...
                           writeArray marr i (indexArray arr i) ...
                           ...

But since the arrays are lazy, the calls to `indexArray` will not be evaluated. Rather, `marr` will be filled with thunks each of which would retain a reference to `arr`. This is definitely not what we want!

With `indexArrayM`, we can instead write

    copy marr arr ... = do ...
                           x <- indexArrayM arr i
                           writeArray marr i x
                           ...

Now, indexing is executed immediately although the returned element is still not evaluated.

Note: this function does not do bounds checking.

indexArray## :: Array a -> Int -> (# a #) #

Read a value from the immutable array at the given index, returning the result in an unboxed unary tuple. This is currently used to implement folds.

Note: this function does not do bounds checking.

freezeArray #

Arguments

:: PrimMonad m |
=> MutableArray (PrimState m) a | source
-> Int | offset
-> Int | length
-> m (Array a) |

Create an immutable copy of a slice of an array.

This operation makes a copy of the specified section, so it is safe to continue using the mutable array afterward.

Note: The provided array should contain the full subrange specified by the two Ints, but this is not checked.

thawArray #

Arguments

:: PrimMonad m |
=> Array a | source
-> Int | offset
-> Int | length
-> m (MutableArray (PrimState m) a) |

Create a mutable array from a slice of an immutable array.

This operation makes a copy of the specified slice, so it is safe to use the immutable array afterward.

Note: The provided array should contain the full subrange specified by the two Ints, but this is not checked.

runArray :: (forall s. ST s (MutableArray s a)) -> Array a #

Execute the monadic action and freeze the resulting array.

    runArray m = runST $ m >>= unsafeFreezeArray

createArray :: Int -> a -> (forall s. MutableArray s a -> ST s ()) -> Array a #

Create an array of the given size with a default value, apply the monadic function and freeze the result. If the size is 0, return `emptyArray` (rather than a new copy thereof).

    createArray 0 _ _ = emptyArray
    createArray n x f = runArray $ do
      mary <- newArray n x
      f mary
      pure mary

unsafeFreezeArray :: PrimMonad m => MutableArray (PrimState m) a -> m (Array a) #

Convert a mutable array to an immutable one without copying. The array should not be modified after the conversion.

unsafeThawArray :: PrimMonad m => Array a -> m (MutableArray (PrimState m) a) #

Convert an immutable array to an mutable one without copying. The immutable array should not be used after the conversion.

sameMutableArray :: MutableArray s a -> MutableArray s a -> Bool #

Check whether the two arrays refer to the same memory block.

copyArray #

Arguments

:: PrimMonad m |
=> MutableArray (PrimState m) a | destination array
-> Int | offset into destination array
-> Array a | source array
-> Int | offset into source array
-> Int | number of elements to copy
-> m () |

Copy a slice of an immutable array to a mutable array.

Note: this function does not do bounds or overlap checking.

copyMutableArray #

Arguments

:: PrimMonad m |
=> MutableArray (PrimState m) a | destination array
-> Int | offset into destination array
-> MutableArray (PrimState m) a | source array
-> Int | offset into source array
-> Int | number of elements to copy
-> m () |

Copy a slice of a mutable array to another array. The two arrays may overlap.

Note: this function does not do bounds or overlap checking.

cloneArray #

Arguments

:: Array a | source array
-> Int | offset into destination array
-> Int | number of elements to copy
-> Array a |

Return a newly allocated `Array` with the specified subrange of the provided `Array`.

Note: The provided array should contain the full subrange specified by the two Ints, but this is not checked.

cloneMutableArray #

Arguments

:: PrimMonad m |
=> MutableArray (PrimState m) a | source array
-> Int | offset into destination array
-> Int | number of elements to copy
-> m (MutableArray (PrimState m) a) |

Return a newly allocated `MutableArray`. with the specified subrange of the provided `MutableArray`. The provided `MutableArray` should contain the full subrange specified by the two Ints, but this is not checked.

Note: The provided array should contain the full subrange specified by the two Ints, but this is not checked.

sizeofArray :: Array a -> Int #

The number of elements in an immutable array.

sizeofMutableArray :: MutableArray s a -> Int #

The number of elements in a mutable array.

emptyArray :: Array a #

The empty `Array`.

arrayFromListN :: Int -> [a] -> Array a #

Create an array from a list of a known length. If the length of the list does not match the given length, this throws an exception.

arrayFromList :: [a] -> Array a #

Create an array from a list.

mapArray' :: (a -> b) -> Array a -> Array b #

Strict map over the elements of the array.

traverseArrayP :: PrimMonad m => (a -> m b) -> Array a -> m (Array b) #

This is the fastest, most straightforward way to traverse an array, but it only works correctly with a sufficiently "affine" `PrimMonad` instance. In particular, it must only produce one result array. `ListT`-transformed monads, for example, will not work right at all.