Safe Haskell | None |
---|
Derive lenses for Lens.Family.
Example usage:
{-# LANGUAGE TemplateHaskell #-} import Lens.Family import Lens.Family.TH data Foo a = Foo { _bar :: Int, _baz :: a } deriving (Show, Read, Eq, Ord) $(mkLenses ''Foo)
Documentation
mkLenses :: Name -> Q [Dec]Source
Derive lenses for the record selectors in a single-constructor data declaration, or for the record selector in a newtype declaration. Lenses will only be generated for record fields which are prefixed with an underscore.
Example usage:
$(mkLenses ''Foo)
mkLensesBy :: (String -> Maybe String) -> Name -> Q [Dec]Source
Derive lenses with the provided name transformation
and filtering function. Produce Just lensName
to generate a lens
of the resultant name, or Nothing
to not generate a lens
for the input record name.
Example usage:
$(mkLensesBy (\n -> Just (n ++ "L")) ''Foo)