@hackage lens-family-core0.0.0

This package provide first class(†) functional references. In addition to the usual operations of getting, setting and composition, plus integration with the state monad, lens families provide some unique features:

• Polymorphic updating

• Cast projection functions to read-only lenses

• Cast semantic editor combinators to modify-only lenses

(†) For optimal first-class support use the lens-family package with rank 2 / rank N polymorphism. Lens.Family.Clone allows for first-class support of lenses for those who require Haskell 98.