| Safe Haskell | Safe-Inferred |
|---|---|
| Language | Haskell2010 |
Agda.Utils.Lens
Description
A cut-down implementation of lenses, with names taken from Edward Kmett's lens package.
Synopsis
- type Lens' o i = forall f. Functor f => (i -> f i) -> o -> f o
- type LensGet o i = o -> i
- type LensSet o i = i -> o -> o
- type LensMap o i = (i -> i) -> o -> o
- key :: Ord k => k -> Lens' (Map k v) (Maybe v)
- (.=) :: MonadState o m => Lens' o i -> i -> m ()
- over :: Lens' o i -> LensMap o i
- set :: Lens' o i -> LensSet o i
- (^.) :: o -> Lens' o i -> i
- lFst :: Lens' (a, b) a
- lSnd :: Lens' (a, b) b
- focus :: Monad m => Lens' o i -> StateT i m a -> StateT o m a
- use :: MonadState o m => Lens' o i -> m i
- (%=) :: MonadState o m => Lens' o i -> (i -> i) -> m ()
- (%==) :: MonadState o m => Lens' o i -> (i -> m i) -> m ()
- (%%=) :: MonadState o m => Lens' o i -> (i -> m (i, r)) -> m r
- locallyState :: MonadState o m => Lens' o i -> (i -> i) -> m r -> m r
- view :: MonadReader o m => Lens' o i -> m i
- locally :: MonadReader o m => Lens' o i -> (i -> i) -> m a -> m a
- locally' :: ((o -> o) -> m a -> m a) -> Lens' o i -> (i -> i) -> m a -> m a
- contains :: Ord k => k -> Lens' (Set k) Bool
- (<&>) :: Functor f => f a -> (a -> b) -> f b
Documentation
type Lens' o i = forall f. Functor f => (i -> f i) -> o -> f o Source #
Van Laarhoven style homogeneous lenses. Mnemoic: "Lens outer inner", same type argument order as 'get :: o -> i'.
(.=) :: MonadState o m => Lens' o i -> i -> m () infix 4 Source #
Write a part of the state.
over :: Lens' o i -> LensMap o i Source #
Modify inner part i of structure o using a function i -> i.
(^.) :: o -> Lens' o i -> i infixl 8 Source #
Get inner part i of structure o as designated by Lens' o i.
focus :: Monad m => Lens' o i -> StateT i m a -> StateT o m a Source #
Focus on a part of the state for a stateful computation.
use :: MonadState o m => Lens' o i -> m i Source #
Read a part of the state.
(%=) :: MonadState o m => Lens' o i -> (i -> i) -> m () infix 4 Source #
Modify a part of the state.
(%==) :: MonadState o m => Lens' o i -> (i -> m i) -> m () infix 4 Source #
Modify a part of the state monadically.
(%%=) :: MonadState o m => Lens' o i -> (i -> m (i, r)) -> m r infix 4 Source #
Modify a part of the state monadically, and return some result.
locallyState :: MonadState o m => Lens' o i -> (i -> i) -> m r -> m r Source #
Modify a part of the state locally.
view :: MonadReader o m => Lens' o i -> m i Source #
Ask for part of read-only state.
locally :: MonadReader o m => Lens' o i -> (i -> i) -> m a -> m a Source #
Modify a part of the state in a subcomputation.