hxt-9.0.1: A collection of tools for processing XML with Haskell. Source code Contents Index

Data.Function.Selector

Synopsis

data Selector s a = S { getS :: s -> a setS :: a -> s -> s } chgS :: Selector s a -> (a -> a) -> s -> s chgM :: Monad m => Selector s a -> (a -> m a) -> s -> m s mkSelector :: (s -> a) -> (a -> s -> s) -> Selector s a idS :: Selector s s (.&&&.) :: Selector s a -> Selector s b -> Selector s (a, b) class Comp1 s a | s -> a where comp1 :: Selector s a class Comp2 s a | s -> a where comp2 :: Selector s a class Comp3 s a | s -> a where comp3 :: Selector s a

Documentation

data Selector s a Source

A Selector is a pair of an access function and a modifying function for reading and updating parts of a composite type Constructors S getS :: s -> a setS :: a -> s -> s

chgS :: Selector s a -> (a -> a) -> s -> s Source

chgM :: Monad m => Selector s a -> (a -> m a) -> s -> m s Source

mkSelector :: (s -> a) -> (a -> s -> s) -> Selector s a Source

Alias for constructor S

idS :: Selector s s Source

(.&&&.) :: Selector s a -> Selector s b -> Selector s (a, b) Source

class Comp1 s a | s -> a where Source

Selectors for pairs and 3-tuples: comp1, comp2, comp3, this can be extended to n-tuples Methods comp1 :: Selector s a Source

class Comp2 s a | s -> a where Source

Methods comp2 :: Selector s a Source

class Comp3 s a | s -> a where Source

Methods comp3 :: Selector s a Source

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