Data.Lens.Strict

Documentation

module Data.Lens.Common

State API

access :: Monad m => Lens a b -> StateT a m b

get the value of a lens into state

(~=) :: Monad m => Lens a b -> b -> StateT a m b

set a value using a lens into state

(!=) :: Monad m => Lens a b -> b -> StateT a m b

set a value using a lens into state

(%=) :: Monad m => Lens a b -> (b -> b) -> StateT a m b

infix modification a value through a lens into state

(!%=) :: Monad m => Lens a b -> (b -> b) -> StateT a m b

infix modification a value through a lens into state

(%%=) :: Monad m => Lens a b -> (b -> (c, b)) -> StateT a m c

infix modification of a value through a lens into state with a supplemental response

(!%%=) :: Monad m => Lens a b -> (b -> (c, b)) -> StateT a m c

infix modification of a value through a lens into state with a supplemental response

(+=) :: (Monad m, Num b) => Lens a b -> b -> StateT a m b

(!+=) :: (Monad m, Num b) => Lens a b -> b -> StateT a m b

(-=) :: (Monad m, Num b) => Lens a b -> b -> StateT a m b

(!-=) :: (Monad m, Num b) => Lens a b -> b -> StateT a m b

(*=) :: (Monad m, Num b) => Lens a b -> b -> StateT a m b

(!*=) :: (Monad m, Num b) => Lens a b -> b -> StateT a m b

(//=) :: (Monad m, Fractional b) => Lens a b -> b -> StateT a m b

(!/=) :: (Monad m, Fractional b) => Lens a b -> b -> StateT a m b

(&&=) :: Monad m => Lens a Bool -> Bool -> StateT a m Bool

(!&&=) :: Monad m => Lens a Bool -> Bool -> StateT a m Bool

(||=) :: Monad m => Lens a Bool -> Bool -> StateT a m Bool

(!||=) :: Monad m => Lens a Bool -> Bool -> StateT a m Bool

focus :: Monad m => Lens a b -> StateT b m c -> StateT a m c