ghc-9.4.6: The GHC API

Safe Haskell	Safe-Inferred
Language	Haskell2010

GHC.Utils.Monad.State.Lazy

Contents

The State monda
Operations

Description

A lazy state monad.

Synopsis

data State s a where
- pattern State :: (s -> (# a, s #)) -> State s a
state :: (s -> (a, s)) -> State s a
evalState :: State s a -> s -> a
execState :: State s a -> s -> s
runState :: State s a -> s -> (a, s)
get :: State s s
gets :: (s -> a) -> State s a
put :: s -> State s ()
modify :: (s -> s) -> State s ()

The State monda

data State s a where Source #

A state monad which is lazy in the state.

Bundled Patterns

pattern State :: (s -> (# a, s #)) -> State s a

Instances

Instances details

Applicative (State s) #
Instance details Defined in GHC.Utils.Monad.State.Lazy Methods pure :: a -> State s a Source # (<>) :: State s (a -> b) -> State s a -> State s b Source # liftA2 :: (a -> b -> c) -> State s a -> State s b -> State s c Source # (>) :: State s a -> State s b -> State s b Source # (<*) :: State s a -> State s b -> State s a Source #
Functor (State s) #
Instance details Defined in GHC.Utils.Monad.State.Lazy Methods fmap :: (a -> b) -> State s a -> State s b Source # (<$) :: a -> State s b -> State s a Source #
Monad (State s) #
Instance details Defined in GHC.Utils.Monad.State.Lazy Methods (>>=) :: State s a -> (a -> State s b) -> State s b Source # (>>) :: State s a -> State s b -> State s b Source # return :: a -> State s a Source #

state :: (s -> (a, s)) -> State s a Source #

evalState :: State s a -> s -> a Source #

execState :: State s a -> s -> s Source #

runState :: State s a -> s -> (a, s) Source #

Operations

get :: State s s Source #

gets :: (s -> a) -> State s a Source #

put :: s -> State s () Source #

modify :: (s -> s) -> State s () Source #