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[ Paquet source : haskell-these  ]

# Paquet : libghc-these-doc (0.7.4-5)

## either-or-both data type; documentation

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").

The major use case of this is provided by the Align class, representing a generalized notion of "zipping with padding" that combines structures without truncating to the size of the smaller input.

Also included is ChronicleT, a monad transformer based on the Monad instance for These a', along with the usual monad transformer bells and whistles.