type-level-natural-number: Simple type level natural numbers

[ bsd3, data, library, type-system ] [ Propose Tags ]

This is a simple implementation of type-level natural numbers that only requires DeriveDataTypeable. Operations requiring more language extensions have been split into a separate package.

The difference between this package and the many others on Hackage implementing type-level naturals is its emphasis on simplicity. It only supports non-negative natural numbers, and only the successor and predicessor operations. It represents natural numbers using a type-level linked list, so it is not intended to be used for representing large numbers. Pre-defined aliases for natural numbers up to 15 are provided.

The code for this package was largely taken from the excellent Vec package; I created this package with the intent of making this functionality more widely available.

Difference from 1.0: Added instances for Typeable, and word synonyms for N0...N15.

Difference from 1.1: Performance enhancements for naturalNumberAsInt. Simplified Show implementation.

Difference from 1.1.1: Gave up on Haskell 2010 compatibility since as of GHC 7.8 manually deriving from Typeable is no longer allowed; now I use DeriveDataTypeable to construct the instances.




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Versions [RSS] 1.0, 1.1, 1.1.1, 2.0
Dependencies base (>=3 && <5) [details]
License BSD-3-Clause
Author Gregory Crosswhite
Maintainer Gregory Crosswhite <gcrosswhite@gmail.com>
Category Type System, Data
Source repo head: git clone git://github.com/gcross/type-level-natural-number.git
this: git clone git://github.com/gcross/type-level-natural-number.git(tag 1.1.1)
Uploaded by GregoryCrosswhite at 2014-03-30T18:38:47Z
Distributions LTSHaskell:2.0, NixOS:2.0, Stackage:2.0
Reverse Dependencies 8 direct, 7 indirect [details]
Downloads 3660 total (15 in the last 30 days)
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Status Docs available [build log]
Successful builds reported [all 1 reports]