Haskell Hierarchical Libraries (base package)ContentsIndex
Data.Array.Storable
Portabilitynon-portable
Stabilityexperimental
Maintainerlibraries@haskell.org
Contents
Arrays of Storable things.
Overloaded mutable array interface
Accessing the pointer to the array contents
Description

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.

Synopsis
data StorableArray i e
module Data.Array.MArray
withStorableArray :: StorableArray i e -> (Ptr e -> IO a) -> IO a
touchStorableArray :: StorableArray i e -> IO ()
Arrays of Storable things.
data StorableArray i e
The array type
show/hide Instances
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
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 ()
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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