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:

• semialign For Align and Zip type-classes.

• semialign-indexed For SemialignWithIndex class, providing ialignWith and izipWith.

• these-lens For lens combinators.

• monad-chronicle For transformers variant of These.

Modules

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Downloads

• these-1.2.1.tar.gz [browse] (Cabal source package)
• Package description (as included in the package)

Maintainer's Corner

Package maintainers

• JohnWiegley, phadej, cmccann

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• edit package information

Candidates

• 0.7.6, 0.8, 0.8.1, 1, 1.0.1, 1.1, 1.1.1, 1.1.1.1