/Haskell 8


Copyright (c) The University of Glasgow 2001
License BSD-style (see the file libraries/base/LICENSE)
Maintainer [email protected]
Stability experimental
Portability non-portable (uses Data.Array.MArray)
Safe Haskell None
Language Haskell2010


A storable array is an IO-mutable array which stores its contents in a contiguous memory block living in the C heap. Elements are stored according to the class Storable. You can obtain the pointer to the array contents to manipulate elements from languages like C.

It is similar to IOUArray but slower. Its advantage is that it's compatible with C.

Arrays of Storable things.

data StorableArray i e Source

The array type

Instances details
Storable e => MArray StorableArray e IO
Instance details

Defined in Data.Array.Storable.Internals


getBounds :: Ix i => StorableArray i e -> IO (i, i) Source

getNumElements :: Ix i => StorableArray i e -> IO Int

newArray :: Ix i => (i, i) -> e -> IO (StorableArray i e) Source

newArray_ :: Ix i => (i, i) -> IO (StorableArray i e) Source

unsafeNewArray_ :: Ix i => (i, i) -> IO (StorableArray i e)

unsafeRead :: Ix i => StorableArray i e -> Int -> IO e

unsafeWrite :: Ix i => StorableArray i e -> Int -> e -> IO ()

Overloaded mutable array interface

Module Data.Array.MArray provides the interface of storable arrays. They are instances of class MArray (with the IO monad).

module Data.Array.MArray

Accessing the pointer to the array contents

withStorableArray :: StorableArray i e -> (Ptr e -> IO a) -> IO a Source

The pointer to the array contents is obtained by withStorableArray. The idea is similar to ForeignPtr (used internally here). The pointer should be used only during execution of the IO action retured by the function passed as argument to withStorableArray.

touchStorableArray :: StorableArray i e -> IO () Source

If you want to use it afterwards, ensure that you touchStorableArray after the last use of the pointer, so the array is not freed too early.

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Licensed under a BSD-style license (see top of the page).