primitive-0.7.4.0: Primitive memory-related operations
Copyright (c) 2015 Dan Doel
License BSD3
Maintainer libraries@haskell.org
Portability non-portable
Safe Haskell None
Language Haskell2010

Data.Primitive.SmallArray

Description

Small arrays are boxed (im)mutable arrays.

The underlying structure of the Array type contains a card table, allowing segments of the array to be marked as having been mutated. This allows the garbage collector to only re-traverse segments of the array that have been marked during certain phases, rather than having to traverse the entire array.

SmallArray lacks this table. This means that it takes up less memory and has slightly faster writes. It is also more efficient during garbage collection so long as the card table would have a single entry covering the entire array. These advantages make them suitable for use as arrays that are known to be small.

The card size is 128, so for uses much larger than that, Array would likely be superior.

Synopsis

Documentation

data SmallArray a Source #

Constructors

SmallArray ( SmallArray# a)

Instances

Instances details
Monad SmallArray Source #
Instance details

Defined in Data.Primitive.SmallArray

Functor SmallArray Source #
Instance details

Defined in Data.Primitive.SmallArray

MonadFix SmallArray Source #
Instance details

Defined in Data.Primitive.SmallArray

MonadFail SmallArray Source #
Instance details

Defined in Data.Primitive.SmallArray

Applicative SmallArray Source #
Instance details

Defined in Data.Primitive.SmallArray

Foldable SmallArray Source #
Instance details

Defined in Data.Primitive.SmallArray

Traversable SmallArray Source #
Instance details

Defined in Data.Primitive.SmallArray

Eq1 SmallArray Source #

Since: 0.6.4.0

Instance details

Defined in Data.Primitive.SmallArray

Ord1 SmallArray Source #

Since: 0.6.4.0

Instance details

Defined in Data.Primitive.SmallArray

Read1 SmallArray Source #

Since: 0.6.4.0

Instance details

Defined in Data.Primitive.SmallArray

Show1 SmallArray Source #

Since: 0.6.4.0

Instance details

Defined in Data.Primitive.SmallArray

MonadZip SmallArray Source #
Instance details

Defined in Data.Primitive.SmallArray

Alternative SmallArray Source #
Instance details

Defined in Data.Primitive.SmallArray

MonadPlus SmallArray Source #
Instance details

Defined in Data.Primitive.SmallArray

NFData1 SmallArray Source #
Instance details

Defined in Data.Primitive.SmallArray

Methods

liftRnf :: (a -> ()) -> SmallArray a -> () Source #

Lift a => Lift ( SmallArray a :: Type ) Source #
Instance details

Defined in Data.Primitive.SmallArray

IsList ( SmallArray a) Source #
Instance details

Defined in Data.Primitive.SmallArray

Associated Types

type Item ( SmallArray a) Source #

Eq a => Eq ( SmallArray a) Source #
Instance details

Defined in Data.Primitive.SmallArray

Data a => Data ( SmallArray a) Source #
Instance details

Defined in Data.Primitive.SmallArray

Methods

gfoldl :: ( forall d b. Data d => c (d -> b) -> d -> c b) -> ( forall g. g -> c g) -> SmallArray a -> c ( SmallArray a) Source #

gunfold :: ( forall b r. Data b => c (b -> r) -> c r) -> ( forall r. r -> c r) -> Constr -> c ( SmallArray a) Source #

toConstr :: SmallArray a -> Constr Source #

dataTypeOf :: SmallArray a -> DataType Source #

dataCast1 :: Typeable t => ( forall d. Data d => c (t d)) -> Maybe (c ( SmallArray a)) Source #

dataCast2 :: Typeable t => ( forall d e. ( Data d, Data e) => c (t d e)) -> Maybe (c ( SmallArray a)) Source #

gmapT :: ( forall b. Data b => b -> b) -> SmallArray a -> SmallArray a Source #

gmapQl :: (r -> r' -> r) -> r -> ( forall d. Data d => d -> r') -> SmallArray a -> r Source #

gmapQr :: forall r r'. (r' -> r -> r) -> r -> ( forall d. Data d => d -> r') -> SmallArray a -> r Source #

gmapQ :: ( forall d. Data d => d -> u) -> SmallArray a -> [u] Source #

gmapQi :: Int -> ( forall d. Data d => d -> u) -> SmallArray a -> u Source #

gmapM :: Monad m => ( forall d. Data d => d -> m d) -> SmallArray a -> m ( SmallArray a) Source #

gmapMp :: MonadPlus m => ( forall d. Data d => d -> m d) -> SmallArray a -> m ( SmallArray a) Source #

gmapMo :: MonadPlus m => ( forall d. Data d => d -> m d) -> SmallArray a -> m ( SmallArray a) Source #

Ord a => Ord ( SmallArray a) Source #

Lexicographic ordering. Subject to change between major versions.

Instance details

Defined in Data.Primitive.SmallArray

Read a => Read ( SmallArray a) Source #
Instance details

Defined in Data.Primitive.SmallArray

Show a => Show ( SmallArray a) Source #
Instance details

Defined in Data.Primitive.SmallArray

Semigroup ( SmallArray a) Source #

Since: 0.6.3.0

Instance details

Defined in Data.Primitive.SmallArray

Monoid ( SmallArray a) Source #
Instance details

Defined in Data.Primitive.SmallArray

NFData a => NFData ( SmallArray a) Source #
Instance details

Defined in Data.Primitive.SmallArray

type Item ( SmallArray a) Source #
Instance details

Defined in Data.Primitive.SmallArray

type Item ( SmallArray a) = a

data SmallMutableArray s a Source #

Instances

Instances details
Eq ( SmallMutableArray s a) Source #
Instance details

Defined in Data.Primitive.SmallArray

( Typeable s, Typeable a) => Data ( SmallMutableArray s a) Source #
Instance details

Defined in Data.Primitive.SmallArray

Methods

gfoldl :: ( forall d b. Data d => c (d -> b) -> d -> c b) -> ( forall g. g -> c g) -> SmallMutableArray s a -> c ( SmallMutableArray s a) Source #

gunfold :: ( forall b r. Data b => c (b -> r) -> c r) -> ( forall r. r -> c r) -> Constr -> c ( SmallMutableArray s a) Source #

toConstr :: SmallMutableArray s a -> Constr Source #

dataTypeOf :: SmallMutableArray s a -> DataType Source #

dataCast1 :: Typeable t => ( forall d. Data d => c (t d)) -> Maybe (c ( SmallMutableArray s a)) Source #

dataCast2 :: Typeable t => ( forall d e. ( Data d, Data e) => c (t d e)) -> Maybe (c ( SmallMutableArray s a)) Source #

gmapT :: ( forall b. Data b => b -> b) -> SmallMutableArray s a -> SmallMutableArray s a Source #

gmapQl :: (r -> r' -> r) -> r -> ( forall d. Data d => d -> r') -> SmallMutableArray s a -> r Source #

gmapQr :: forall r r'. (r' -> r -> r) -> r -> ( forall d. Data d => d -> r') -> SmallMutableArray s a -> r Source #

gmapQ :: ( forall d. Data d => d -> u) -> SmallMutableArray s a -> [u] Source #

gmapQi :: Int -> ( forall d. Data d => d -> u) -> SmallMutableArray s a -> u Source #

gmapM :: Monad m => ( forall d. Data d => d -> m d) -> SmallMutableArray s a -> m ( SmallMutableArray s a) Source #

gmapMp :: MonadPlus m => ( forall d. Data d => d -> m d) -> SmallMutableArray s a -> m ( SmallMutableArray s a) Source #

gmapMo :: MonadPlus m => ( forall d. Data d => d -> m d) -> SmallMutableArray s a -> m ( SmallMutableArray s a) Source #

newSmallArray Source #

Arguments

:: PrimMonad m
=> Int

size

-> a

initial contents

-> m ( SmallMutableArray ( PrimState m) a)

Create a new small mutable array.

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

readSmallArray Source #

Arguments

:: PrimMonad m
=> SmallMutableArray ( PrimState m) a

array

-> Int

index

-> m a

Read the element at a given index in a mutable array.

Note: this function does not do bounds checking.

writeSmallArray Source #

Arguments

:: PrimMonad m
=> SmallMutableArray ( PrimState m) a

array

-> Int

index

-> a

new element

-> m ()

Write an element at the given idex in a mutable array.

Note: this function does not do bounds checking.

copySmallArray Source #

Arguments

:: PrimMonad m
=> SmallMutableArray ( PrimState m) a

destination

-> Int

destination offset

-> SmallArray a

source

-> Int

source offset

-> Int

length

-> m ()

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

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

copySmallMutableArray Source #

Arguments

:: PrimMonad m
=> SmallMutableArray ( PrimState m) a

destination

-> Int

destination offset

-> SmallMutableArray ( PrimState m) a

source

-> Int

source offset

-> Int

length

-> m ()

Copy a slice of one mutable array into another.

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

indexSmallArray Source #

Arguments

:: SmallArray a

array

-> Int

index

-> a

Look up an element in an immutable array.

Note: this function does not do bounds checking.

indexSmallArrayM Source #

Arguments

:: Monad m
=> SmallArray a

array

-> Int

index

-> m a

Look up an element in an immutable array.

The purpose of returning a result using a monad is to allow the caller to avoid retaining references to the array. Evaluating the return value will cause the array lookup to be performed, even though it may not require the element of the array to be evaluated (which could throw an exception). For instance:

data Box a = Box a
...

f sa = case indexSmallArrayM sa 0 of
  Box x -> ...

x is not a closure that references sa as it would be if we instead wrote:

let x = indexSmallArray sa 0

It also does not prevent sa from being garbage collected.

Note that Identity is not adequate for this use, as it is a newtype, and cannot be evaluated without evaluating the element.

Note: this function does not do bounds checking.

indexSmallArray## :: SmallArray a -> Int -> (# a #) Source #

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.

cloneSmallArray Source #

Arguments

:: SmallArray a

source

-> Int

offset

-> Int

length

-> SmallArray a

Create a copy of a slice of an immutable array.

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

cloneSmallMutableArray Source #

Arguments

:: PrimMonad m
=> SmallMutableArray ( PrimState m) a

source

-> Int

offset

-> Int

length

-> m ( SmallMutableArray ( PrimState m) a)

Create a copy of a slice of a mutable array.

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

freezeSmallArray Source #

Arguments

:: PrimMonad m
=> SmallMutableArray ( PrimState m) a

source

-> Int

offset

-> Int

length

-> m ( SmallArray a)

Create an immutable array corresponding to a slice of a mutable array.

This operation copies the portion of the array to be frozen.

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

unsafeFreezeSmallArray :: PrimMonad m => SmallMutableArray ( PrimState m) a -> m ( SmallArray a) Source #

Render a mutable array immutable.

This operation performs no copying, so care must be taken not to modify the input array after freezing.

thawSmallArray Source #

Arguments

:: PrimMonad m
=> SmallArray a

source

-> Int

offset

-> Int

length

-> m ( SmallMutableArray ( PrimState m) a)

Create a mutable array corresponding to a slice of an immutable array.

This operation copies the portion of the array to be thawed.

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

unsafeThawSmallArray :: PrimMonad m => SmallArray a -> m ( SmallMutableArray ( PrimState m) a) Source #

Render an immutable array mutable.

This operation performs no copying, so care must be taken with its use.

runSmallArray :: ( forall s. ST s ( SmallMutableArray s a)) -> SmallArray a Source #

Execute the monadic action and freeze the resulting array.

runSmallArray m = runST $ m >>= unsafeFreezeSmallArray

createSmallArray :: Int -> a -> ( forall s. SmallMutableArray s a -> ST s ()) -> SmallArray a Source #

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 emptySmallArray (rather than a new copy thereof).

createSmallArray 0 _ _ = emptySmallArray
createSmallArray n x f = runSmallArray $ do
  mary <- newSmallArray n x
  f mary
  pure mary

sizeofSmallArray :: SmallArray a -> Int Source #

The number of elements in an immutable array.

sizeofSmallMutableArray :: SmallMutableArray s a -> Int Source #

The number of elements in a mutable array.

shrinkSmallMutableArray :: PrimMonad m => SmallMutableArray ( PrimState m) a -> Int -> m () Source #

Shrink the mutable array in place. The size given must be equal to or less than the current size of the array. This is not checked.

smallArrayFromListN :: Int -> [a] -> SmallArray a Source #

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

mapSmallArray' :: (a -> b) -> SmallArray a -> SmallArray b Source #

Strict map over the elements of the array.

traverseSmallArrayP :: PrimMonad m => (a -> m b) -> SmallArray a -> m ( SmallArray b) Source #

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.