Safe Haskell	None
Language	GHC2021

GHC.Utils.Monad.State.Strict

Contents

Description

A state monad which is strict in its state.

Synopsis

The State monad

data State s a where Source #

A state monad which is strict in the state s, but lazy in the value a.

See Note [Strict State monad] for the particular notion of strictness and implementation details.

Bundled Patterns

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

Instances details

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

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

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

Operations

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

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

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