GHC.Generics.Optics

Note: GHC.Generics exports a number of names that collide with Optics (at least to).

You can use hiding or imports to mitigate this to an extent, and the following imports, represent a fair compromise for user code:

import Optics
import GHC.Generics hiding (to)
import GHC.Generics.Optics

You can use generic to replace from and to from GHC.Generics.

Documentation

generic :: (Generic a, Generic b) => Iso a b (Rep a c) (Rep b c)

Convert from the data type to its representation (or back)

>>> view (generic % re generic) "hello" :: String
"hello"

generic1 :: (Generic1 f, Generic1 g) => Iso (f a) (g b) (Rep1 f a) (Rep1 g b)

Convert from the data type to its representation (or back)

_V1 :: Lens (V1 s) (V1 t) a b

_U1 :: Iso (U1 p) (U1 q) () ()

_Par1 :: Iso (Par1 p) (Par1 q) p q

_Rec1 :: Iso (Rec1 f p) (Rec1 g q) (f p) (g q)

_K1 :: Iso (K1 i c p) (K1 j d q) c d

_M1 :: Iso (M1 i c f p) (M1 j d g q) (f p) (g q)

_L1 :: Prism ((a :+: c) t) ((b :+: c) t) (a t) (b t)

_R1 :: Prism ((c :+: a) t) ((c :+: b) t) (a t) (b t)