fin: Nat and Fin: peano naturals and finite numbers
This is a package candidate release! Here you can preview how this package release will appear once published to the main package index (which can be accomplished via the 'maintain' link below). Please note that once a package has been published to the main package index it cannot be undone! Please consult the package uploading documentation for more information.
This package provides two simple types, and some tools to work with them.
Also on type level as DataKinds.
-- Peano naturals
data Nat = Z | S Nat
-- Finite naturals
data Fin (n :: Nat) where
Z :: Fin ('S n)
S :: Fin n -> Fin ('Nat.S n)
vec implements length-indexed (sized) lists using this package for indexes.
The Data.Fin.Enum module let's work generically with enumerations.
See Hasochism: the pleasure and pain of dependently typed haskell programming by Sam Lindley and Conor McBride for answers to how and why. Read APLicative Programming with Naperian Functors by Jeremy Gibbons for (not so) different ones.
Similar packages
finite-typelits . Is a great package, but uses
GHC.TypeLits.type-natural depends on
singletonspackage.finwill try to stay light on the dependencies, and support as many GHC versions as practical.peano is very incomplete
nat as well.
PeanoWitnesses doesn't use
DataKinds.type-combinators is big package too.
Properties
| Versions | 0, 0.0.1, 0.0.2, 0.0.2, 0.0.3, 0.1, 0.1.1, 0.2, 0.2.1, 0.3, 0.3.1, 0.3.2 |
|---|---|
| Change log | ChangeLog.md |
| Dependencies | base (>=4.7 && <4.13), bifunctors (>=5.5.3 && <5.6), deepseq (>=1.3.0.2 && <1.5), hashable (>=1.2.7.0 && <1.3), nats (>=1.1.2 && <1.2), semigroups (>=0.18.4 && <0.19), void (>=0.7.2 && <0.8) [details] |
| License | BSD-3-Clause |
| Copyright | (c) 2017 Oleg Grenrus |
| Author | Oleg Grenrus <oleg.grenrus@iki.fi> |
| Maintainer | Oleg.Grenrus <oleg.grenrus@iki.fi> |
| Category | Data |
| Home page | https://github.com/phadej/vec |
| Bug tracker | https://github.com/phadej/vec/issues |
| Source repo | head: git clone https://github.com/phadej/vec.git |
| Uploaded | by phadej at 2019-04-25T17:46:29Z |
Modules
[Index] [Quick Jump]
Downloads
- fin-0.0.2.tar.gz [browse] (Cabal source package)
- Package description (as included in the package)
Maintainer's Corner
Package maintainers
For package maintainers and hackage trustees