GHC.Utils.Monad.State.Lazy

A lazy state monad.

The State monda

data State s a where

A state monad which is lazy in the state.

Bundled Patterns

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

Instances

Applicative (State s)

Defined in GHC.Utils.Monad.State.Lazy

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)

Defined in GHC.Utils.Monad.State.Lazy

Methods

fmap :: (a -> b) -> State s a -> State s b

(<$) :: a -> State s b -> State s a

Monad (State s)

Defined in GHC.Utils.Monad.State.Lazy

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

evalState :: State s a -> s -> a

execState :: State s a -> s -> s

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

Operations

get :: State s s

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

put :: s -> State s ()

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