Data.Generics.Product.Any

Derive a variety of lenses generically.

1 class

Packagegeneric-lens-2.3.0.0
Exports1
LanguageHaskell2010
LicenceBSD-3-Clause
SourceAny.hs

Lenses

1 declaration

Running example:

Example6 expressions

>>> :set -XTypeApplications>>> :set -XDataKinds>>> :set -XDeriveGeneric>>> import GHC.Generics>>> :m +Data.Generics.Internal.VL.Lens>>> :{data Human = Human  { name    :: String  , age     :: Int  , address :: String  }  deriving (Generic, Show)human :: Humanhuman = Human "Tunyasz" 50 "London":}

classclass HasAny (sel :: k) s t a b | s sel -> a where

Methods

the :: Lens s t a b
A lens that focuses on a part of a product as identified by some selector. Currently supported selectors are field names, positions and unique types. Compatible with the lens package's Control.Lens.Lens type.
Example1 expression
```
>>> human ^. the @Int50
```
Example1 expression
```
>>> human ^. the @"name""Tunyasz"
```
Example1 expression
```
>>> human ^. the @3"London"
```

Instances3HasAny

HasField field s t a b => HasAny field s t a bDefined in generic-lens-2.3.0.0 · Data.Generics.Product.Any
HasPosition i s t a b => HasAny i s t a bDefined in generic-lens-2.3.0.0 · Data.Generics.Product.Any
(HasType a s, t ~ s, a ~ b) => HasAny a s t a bDefined in generic-lens-2.3.0.0 · Data.Generics.Product.Any