base-4.18.0.0: Basic libraries
Copyright(c) The FFI task force 2001
LicenseBSD-style (see the file libraries/base/LICENSE)
Maintainerffi@haskell.org
Stabilityprovisional
Portabilityportable
Safe HaskellTrustworthy
LanguageHaskell2010

Foreign.Marshal.Array

Description

Marshalling support: routines allocating, storing, and retrieving Haskell lists that are represented as arrays in the foreign language

Synopsis

Marshalling arrays

Allocation

mallocArray :: forall a. Storable a => Int -> IO (Ptr a) Source #

Allocate storage for the given number of elements of a storable type (like malloc, but for multiple elements).

mallocArray0 :: Storable a => Int -> IO (Ptr a) Source #

Like mallocArray, but add an extra position to hold a special termination element.

allocaArray :: forall a b. Storable a => Int -> (Ptr a -> IO b) -> IO b Source #

Temporarily allocate space for the given number of elements (like alloca, but for multiple elements).

allocaArray0 :: Storable a => Int -> (Ptr a -> IO b) -> IO b Source #

Like allocaArray, but add an extra position to hold a special termination element.

reallocArray :: forall a. Storable a => Ptr a -> Int -> IO (Ptr a) Source #

Adjust the size of an array

reallocArray0 :: Storable a => Ptr a -> Int -> IO (Ptr a) Source #

Adjust the size of an array including an extra position for the end marker.

callocArray :: forall a. Storable a => Int -> IO (Ptr a) Source #

Like mallocArray, but allocated memory is filled with bytes of value zero.

callocArray0 :: Storable a => Int -> IO (Ptr a) Source #

Like callocArray0, but allocated memory is filled with bytes of value zero.

Marshalling

peekArray :: Storable a => Int -> Ptr a -> IO [a] Source #

Convert an array of given length into a Haskell list. The implementation is tail-recursive and so uses constant stack space.

peekArray0 :: (Storable a, Eq a) => a -> Ptr a -> IO [a] Source #

Convert an array terminated by the given end marker into a Haskell list

pokeArray :: Storable a => Ptr a -> [a] -> IO () Source #

Write the list elements consecutive into memory

pokeArray0 :: Storable a => a -> Ptr a -> [a] -> IO () Source #

Write the list elements consecutive into memory and terminate them with the given marker element

Combined allocation and marshalling

newArray :: Storable a => [a] -> IO (Ptr a) Source #

Write a list of storable elements into a newly allocated, consecutive sequence of storable values (like new, but for multiple elements).

newArray0 :: Storable a => a -> [a] -> IO (Ptr a) Source #

Write a list of storable elements into a newly allocated, consecutive sequence of storable values, where the end is fixed by the given end marker

withArray :: Storable a => [a] -> (Ptr a -> IO b) -> IO b Source #

Temporarily store a list of storable values in memory (like with, but for multiple elements).

withArray0 :: Storable a => a -> [a] -> (Ptr a -> IO b) -> IO b Source #

Like withArray, but a terminator indicates where the array ends

withArrayLen :: Storable a => [a] -> (Int -> Ptr a -> IO b) -> IO b Source #

Like withArray, but the action gets the number of values as an additional parameter

withArrayLen0 :: Storable a => a -> [a] -> (Int -> Ptr a -> IO b) -> IO b Source #

Like withArrayLen, but a terminator indicates where the array ends

Copying

(argument order: destination, source)

copyArray :: forall a. Storable a => Ptr a -> Ptr a -> Int -> IO () Source #

Copy the given number of elements from the second array (source) into the first array (destination); the copied areas may not overlap

moveArray :: forall a. Storable a => Ptr a -> Ptr a -> Int -> IO () Source #

Copy the given number of elements from the second array (source) into the first array (destination); the copied areas may overlap

Finding the length

lengthArray0 :: (Storable a, Eq a) => a -> Ptr a -> IO Int Source #

Return the number of elements in an array, excluding the terminator

Indexing

advancePtr :: forall a. Storable a => Ptr a -> Int -> Ptr a Source #

Advance a pointer into an array by the given number of elements