Generics.Deriving.Lens

Note: Generics.Deriving exports a number of names that collide with Control.Lens.

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

 import Generics.Deriving hiding (from, to)

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

Isomorphisms for GHC.Generics

generic :: Generic a => Iso' a (Rep a b)

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

>>> "hello"^.generic.from generic :: String
"hello"

generic1 :: Generic1 f => Iso' (f a) (Rep1 f a)

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

Generic Traversal

tinplate :: (Generic a, GTraversal (Rep a), Typeable b) => Traversal' a b

A Generic Traversal that visits every occurrence of something Typeable anywhere in a container.

>>> allOf tinplate (=="Hello") (1::Int,2::Double,(),"Hello",["Hello"])
True

>>> mapMOf_ tinplate putStrLn ("hello",[(2 :: Int, "world!")])
hello
world!

class GTraversal f

Used to traverse Generic data by uniplate.

Instances

GTraversal V1

GTraversal U1

(Generic a, GTraversal (Rep a), Typeable a) => GTraversal (K1 i a)

(GTraversal f, GTraversal g) => GTraversal (:+: f g)

(GTraversal f, GTraversal g) => GTraversal (:*: f g)

GTraversal a => GTraversal (M1 i c a)