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

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 #
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 #
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 #

the interface for converting an IO predicate into a list arrow

Minimal complete definition

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