ghc-these
An either-or-both data type
This package provides a data type 'These a b' which can hold a value of either type or values of each type. This is usually thought of as an "inclusive or" type (contrasting 'Either a b' as "exclusive or") or as an "outer join" type (contrasting '(a, b)' as "inner join"). ' data These a b = This a | That b | These a b ' Since version 1, this package was split into parts: *<https://hackage.haskell.org/package/semialign semialign>For 'Align' and 'Zip' type-classes. *<https://hackage.haskell.org/package/semialign-indexed semialign-indexed>For 'SemialignWithIndex' class, providing 'ialignWith' and 'izipWith'. *<https://hackage.haskell.org/package/these-lens these-lens>For lens combinators. *<http://hackage.haskell.org/package/monad-chronicle monad-chronicle>For transformers variant of 'These'.
BSD-3-Clause