hxt-9.3.1.18: A collection of tools for processing XML with Haskell.

CopyrightCopyright (C) 2005 Uwe Schmidt
LicenseMIT
MaintainerUwe Schmidt (uwe\@fh-wedel.de)
Stabilityexperimental
Portabilityportable
Safe HaskellSafe
LanguageHaskell98

Control.Arrow.ArrowIO

Description

Lifting of IO actions to arrows

Synopsis

Documentation

class Arrow a => ArrowIO a where Source #

the interface for converting an IO action into an arrow

Minimal complete definition

arrIO

Methods

arrIO :: (b -> IO c) -> a b c Source #

construct an arrow from an IO action

arrIO0 :: IO c -> a b c Source #

construct an arrow from an IO action without any parameter

arrIO2 :: (b1 -> b2 -> IO c) -> a (b1, b2) c Source #

construction of a 2 argument arrow from a binary IO action | | example: a1 &&& a2 >>> arr2 f

arrIO3 :: (b1 -> b2 -> b3 -> IO c) -> a (b1, (b2, b3)) c Source #

construction of a 3 argument arrow from a 3-ary IO action | | example: a1 &&& a2 &&& a3 >>> arr3 f

arrIO4 :: (b1 -> b2 -> b3 -> b4 -> IO c) -> a (b1, (b2, (b3, b4))) c Source #

construction of a 4 argument arrow from a 4-ary IO action | | example: a1 &&& a2 &&& a3 &&& a4 >>> arr4 f

Instances
ArrowIO IOLA Source # 
Instance details

Defined in Control.Arrow.IOListArrow

Methods

arrIO :: (b -> IO c) -> IOLA b c Source #

arrIO0 :: IO c -> IOLA b c Source #

arrIO2 :: (b1 -> b2 -> IO c) -> IOLA (b1, b2) c Source #

arrIO3 :: (b1 -> b2 -> b3 -> IO c) -> IOLA (b1, (b2, b3)) c Source #

arrIO4 :: (b1 -> b2 -> b3 -> b4 -> IO c) -> IOLA (b1, (b2, (b3, b4))) c Source #

ArrowIO (IOSLA s) Source # 
Instance details

Defined in Control.Arrow.IOStateListArrow

Methods

arrIO :: (b -> IO c) -> IOSLA s b c Source #

arrIO0 :: IO c -> IOSLA s b c Source #

arrIO2 :: (b1 -> b2 -> IO c) -> IOSLA s (b1, b2) c Source #

arrIO3 :: (b1 -> b2 -> b3 -> IO c) -> IOSLA s (b1, (b2, b3)) c Source #

arrIO4 :: (b1 -> b2 -> b3 -> b4 -> IO c) -> IOSLA s (b1, (b2, (b3, b4))) c Source #

class (Arrow a, ArrowIO a) => ArrowIOIf a where Source #

the interface for converting an IO predicate into a list arrow

Methods

isIOA :: (b -> IO Bool) -> a b b Source #

builds an arrow from an IO predicate

if the predicate holds, the single list containing the input is returned, else the empty list, similar to isA

Instances
ArrowIOIf IOLA Source # 
Instance details

Defined in Control.Arrow.IOListArrow

Methods

isIOA :: (b -> IO Bool) -> IOLA b b Source #

ArrowIOIf (IOSLA s) Source # 
Instance details

Defined in Control.Arrow.IOStateListArrow

Methods

isIOA :: (b -> IO Bool) -> IOSLA s b b Source #