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Foreign.Marshal.Array

Portability | portable
Stability | provisional
Maintainer | ffi@haskell.org

Contents

Marshalling arrays
  Allocation
  Marshalling
  Combined allocation and marshalling
  Copying
  Finding the length
  Indexing

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

mallocArray :: Storable a => Int -> IO (Ptr a)
mallocArray0 :: Storable a => Int -> IO (Ptr a)
allocaArray :: Storable a => Int -> (Ptr a -> IO b) -> IO b
allocaArray0 :: Storable a => Int -> (Ptr a -> IO b) -> IO b
reallocArray :: Storable a => Ptr a -> Int -> IO (Ptr a)
reallocArray0 :: Storable a => Ptr a -> Int -> IO (Ptr a)
peekArray :: Storable a => Int -> Ptr a -> IO [a]
peekArray0 :: (Storable a, Eq a) => a -> Ptr a -> IO [a]
pokeArray :: Storable a => Ptr a -> [a] -> IO ()
pokeArray0 :: Storable a => a -> Ptr a -> [a] -> IO ()
newArray :: Storable a => [a] -> IO (Ptr a)
newArray0 :: Storable a => a -> [a] -> IO (Ptr a)
withArray :: Storable a => [a] -> (Ptr a -> IO b) -> IO b
withArray0 :: Storable a => a -> [a] -> (Ptr a -> IO b) -> IO b
copyArray :: Storable a => Ptr a -> Ptr a -> Int -> IO ()
moveArray :: Storable a => Ptr a -> Ptr a -> Int -> IO ()
lengthArray0 :: (Storable a, Eq a) => a -> Ptr a -> IO Int
advancePtr :: Storable a => Ptr a -> Int -> Ptr a

Marshalling arrays
Allocation
mallocArray :: Storable a => Int -> IO (Ptr a)
Allocate storage for the given number of elements of a storable type.
mallocArray0 :: Storable a => Int -> IO (Ptr a)
Like `mallocArray`, but add an extra element to signal the end of the array
allocaArray :: Storable a => Int -> (Ptr a -> IO b) -> IO b

Temporarily allocate space for the given number of elements.

- see `alloca` for the storage lifetime constraints

allocaArray0 :: Storable a => Int -> (Ptr a -> IO b) -> IO b
Like `allocaArray`, but add an extra element to signal the end of the array
reallocArray :: Storable a => Ptr a -> Int -> IO (Ptr a)
Adjust the size of an array
reallocArray0 :: Storable a => Ptr a -> Int -> IO (Ptr a)
Adjust the size of an array while adding an element for the end marker
Marshalling
peekArray :: Storable a => Int -> Ptr a -> IO [a]
Convert an array of given length into a Haskell list. This version traverses the array backwards using an accumulating parameter, which uses constant stack space. The previous version using mapM needed linear stack space.
peekArray0 :: (Storable a, Eq a) => a -> Ptr a -> IO [a]
Convert an array terminated by the given end marker into a Haskell list
pokeArray :: Storable a => Ptr a -> [a] -> IO ()
Write the list elements consecutive into memory
pokeArray0 :: Storable a => a -> Ptr a -> [a] -> IO ()
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)
Write a list of storable elements into a newly allocated, consecutive sequence of storable values
newArray0 :: Storable a => a -> [a] -> IO (Ptr a)
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
Temporarily store a list of storable values in memory
withArray0 :: Storable a => a -> [a] -> (Ptr a -> IO b) -> IO b
Like `withArray`, but a terminator indicates where the array ends
Copying
(argument order: destination, source)
copyArray :: Storable a => Ptr a -> Ptr a -> Int -> IO ()
Copy the given number of elements from the second array (source) into the first array (destination); the copied areas may not overlap
moveArray :: Storable a => Ptr a -> Ptr a -> Int -> IO ()
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
Return the number of elements in an array, excluding the terminator
Indexing
advancePtr :: Storable a => Ptr a -> Int -> Ptr a
Advance a pointer into an array by the given number of elements
Produced by Haddock version 0.6