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Haskell Core Libraries (base package)ParentContentsIndex
Data.Array.IO
Portability non-portable
Stability experimental
Maintainer libraries@haskell.org
Contents
IO arrays with boxed elements
IO arrays with unboxed elements
Overloaded mutable array interface
Doing I/O with IOUArrays
Description
Mutable boxed and unboxed arrays in the IO monad.
Synopsis
data IOArray i e
data IOUArray i e
castIOUArray :: IOUArray ix a -> IO (IOUArray ix b)
module Data.Array.MArray
hGetArray :: Handle -> IOUArray Int Word8 -> Int -> IO Int
hPutArray :: Handle -> IOUArray Int Word8 -> Int -> IO ()
IO arrays with boxed elements
data IOArray i e

Mutable, boxed, non-strict arrays in the IO monad. The type arguments are as follows:

  • i: the index type of the array (should be an instance of Ix)

  • e: the element type of the array.

Instances
IArray (IOToDiffArray IOArray) e
(Typeable a, Typeable b) => Typeable (IOArray a b)
HasBounds IOArray
MArray IOArray e IO
IO arrays with unboxed elements
data IOUArray i e

Mutable, unboxed, strict arrays in the IO monad. The type arguments are as follows:

  • i: the index type of the array (should be an instance of Ix)

  • e: the element type of the array. Only certain element types are supported: see MArray for a list of instances.

Instances
IArray (IOToDiffArray IOUArray) Char
IArray (IOToDiffArray IOUArray) Int
IArray (IOToDiffArray IOUArray) Word
IArray (IOToDiffArray IOUArray) (Ptr a)
IArray (IOToDiffArray IOUArray) (FunPtr a)
IArray (IOToDiffArray IOUArray) Float
IArray (IOToDiffArray IOUArray) Double
IArray (IOToDiffArray IOUArray) (StablePtr a)
IArray (IOToDiffArray IOUArray) Int8
IArray (IOToDiffArray IOUArray) Int16
IArray (IOToDiffArray IOUArray) Int32
IArray (IOToDiffArray IOUArray) Int64
IArray (IOToDiffArray IOUArray) Word8
IArray (IOToDiffArray IOUArray) Word16
IArray (IOToDiffArray IOUArray) Word32
IArray (IOToDiffArray IOUArray) Word64
(Typeable a, Typeable b) => Typeable (IOUArray a b)
HasBounds IOUArray
MArray IOUArray Bool IO
MArray IOUArray Char IO
MArray IOUArray Int IO
MArray IOUArray Word IO
MArray IOUArray (Ptr a) IO
MArray IOUArray (FunPtr a) IO
MArray IOUArray Float IO
MArray IOUArray Double IO
MArray IOUArray (StablePtr a) IO
MArray IOUArray Int8 IO
MArray IOUArray Int16 IO
MArray IOUArray Int32 IO
MArray IOUArray Int64 IO
MArray IOUArray Word8 IO
MArray IOUArray Word16 IO
MArray IOUArray Word32 IO
MArray IOUArray Word64 IO
castIOUArray :: IOUArray ix a -> IO (IOUArray ix b)
Casts an IOUArray with one element type into one with a different element type. All the elements of the resulting array are undefined (unless you know what you're doing...).
Overloaded mutable array interface
module Data.Array.MArray
Doing I/O with IOUArrays
hGetArray
:: Handle Handle to read from
-> IOUArray Int Word8 Array in which to place the values
-> Int Number of Word8s to read
-> IO Int Returns: the number of Word8s actually read, which might be smaller than the number requested if the end of file was reached.
Reads a number of Word8s from the specified Handle directly into an array.
hPutArray
:: Handle Handle to write to
-> IOUArray Int Word8 Array to write from
-> Int Number of Word8s to write
-> IO ()
Writes an array of Word8 to the specified Handle.
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