HORIZON HASKELLDocslts/ghc-10.0.xfc4e5982026-10-11Search names, modules, packages, or :: a typeCtrl K

GHC 10.0.0.20260917 · lts/ghc-10.0.x · fc4e598 · 2026-10-11

Moduleeither-n-0.1.0.0Haskell2010

Data.Lens.Injection.Injection18

The eighteenth injection of a sum type, as a prism. The sum-type dual of Control.Lens.Field18.

  • 1 class
  • Packageeither-n-0.1.0.0
  • Exports1
  • LanguageHaskell2010
  • LicenceBSD-3-Clause
  • SourceInjection18.hs
classclass Injection18 s t a b | s -> a, t -> b, s b -> t, t a -> s where
#

Access the eighteenth constructor of a sum type.

Where Control.Lens._18 is the eighteenth projection out of a product, _I18 is the eighteenth injection into a sum.

The default implementation is the prism to the eighteenth constructor of a Generic type, injection (Proxy :: Proxy 17).

Example3 expressions
data T = C1 | C2 | C3 | C4 | C5 | C6 | C7 | C8 | C9 | C10 | C11 | C12 | C13 | C14 | C15 | C16 | C17 | C18 Int | C19 deriving (Show, Generic)instance Injection18 T T Int IntC18 1 ^? _I18Just 1
Example1 expression
C19 ^? _I18Nothing
Example1 expression
_I18 # 1 :: TC18 1

Methods