fin: Nat and Fin: peano naturals and finite numbers
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
singletons
package.fin
will 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.
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- fin-0.1.tar.gz [browse] (Cabal source package)
- Package description (revised from the package)
Note: This package has metadata revisions in the cabal description newer than included in the tarball. To unpack the package including the revisions, use 'cabal get'.
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Versions [RSS] | 0, 0.0.1, 0.0.2, 0.0.3, 0.1, 0.1.1, 0.2, 0.2.1, 0.3, 0.3.1 |
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Change log | ChangeLog.md |
Dependencies | base (>=4.7 && <4.14), bifunctors (>=5.5.3 && <5.6), dec (>=0.0.3 && <0.1), deepseq (>=1.3.0.2 && <1.5), hashable (>=1.2.7.0 && <1.4), nats (>=1.1.2 && <1.2), semigroups (>=0.18.4 && <0.20), void (>=0.7.2 && <0.8) [details] |
License | BSD-3-Clause |
Copyright | (c) 2017-2019 Oleg Grenrus |
Author | Oleg Grenrus <oleg.grenrus@iki.fi> |
Maintainer | Oleg.Grenrus <oleg.grenrus@iki.fi> |
Revised | Revision 1 made by phadej at 2019-09-07T08:07:07Z |
Category | Data, Dependent Types, Singletons |
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 2019-07-07T11:14:28Z |
Distributions | Arch:0.3, LTSHaskell:0.3, NixOS:0.3, Stackage:0.3.1 |
Reverse Dependencies | 14 direct, 7864 indirect [details] |
Downloads | 12831 total (182 in the last 30 days) |
Rating | 2.0 (votes: 1) [estimated by Bayesian average] |
Your Rating | |
Status | Docs available [build log] Last success reported on 2019-07-07 [all 1 reports] |