circular-enum

Circular successor & predecessor for bounded enum types

import Data.Enum.Circular (csucc, cpred)

data Direction = N | E | S | W deriving (Show, Eq, Enum, Bounded)

show $ take 6 (iterate csucc N)
-- "[N,E,S,W,N,E]"

csucc and cpred are compatible with succ and pred, but they behave circular on the type boundaries. Requires Eq, Enum and Bounded instances.

Contributors

• Mirko Westermeier (@memowe)

Author and License

Copyright (c) 2023 Mirko Westermeier (@memowe)

Released under the MIT license. See LICENSE for details.