dec

Decidable propositions.

https://github.com/phadej/dec

Version on this page:0.0.5@rev:2
LTS Haskell 24.17:0.0.6@rev:1
Stackage Nightly 2025-10-31:0.0.6@rev:1
Latest on Hackage:0.0.6@rev:1

See all snapshots dec appears in

BSD-3-Clause licensed by Oleg Grenrus
Maintained by Oleg.Grenrus
This version can be pinned in stack with:dec-0.0.5@sha256:1044421ac555d062a843865b06941b8c744261e122930f680524c0bd2095b6ed,1482

Module documentation for 0.0.5

Depends on 2 packages(full list with versions):
base, boring
Used by 3 packages in lts-22.11(full list with versions):
bin, fin, singleton-bool

This package provides a Dec type.

type Neg a = a -> Void

data Dec a
    = Yes a
    | No (Neg a)

Changes

Revision history for dec

0.0.5

  • Add boringYes and absurdNo.
  • Add Decidable a => Boring (Dec a) instance.
  • Add Decidable (), Decidable Void, Decidable (a, b) instances.

0.0.4

  • Mark module as explicitly Safe.

0.0.3

  • First version. Released on an unsuspecting world.