non-empty: List-like structures with static restrictions on the number of elements

[ bsd3, data, library ] [ Propose Tags ]

We provide the data type NonEmpty that allows to store a list-like structure with at least or exactly n elements, where n is fixed in the type in a kind of Peano encoding and is usually small. The datatype is intended to increase safety by making functions total that are partial on plain lists. E.g. on a non-empty list, head and tail are always defined.

There are more such data types like Optional and Empty. Together with NonEmpty you can define a list type for every finite set of admissible list lengths.

The datatype can be combined with Lists, Sequences and Sets (from the containers package).

The package needs only Haskell 98.

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Versions 0.0, 0.1, 0.1.1, 0.1.2, 0.1.3, 0.2, 0.2.1, 0.3, 0.3.0.1
Dependencies base (==4.*), containers (>=0.4 && <0.7), deepseq (>=1.3 && <1.5), QuickCheck (>=2.1 && <3), utility-ht (>=0.0.8 && <0.1) [details]
License BSD-3-Clause
Author Henning Thielemann <haskell@henning-thielemann.de>
Maintainer Henning Thielemann <haskell@henning-thielemann.de>
Category Data
Home page http://hub.darcs.net/thielema/non-empty/
Source repo this: darcs get http://hub.darcs.net/thielema/non-empty/ --tag 0.3.0.1
head: darcs get http://hub.darcs.net/thielema/non-empty/
Uploaded by HenningThielemann at Thu Jul 19 16:09:09 UTC 2018
Distributions LTSHaskell:0.3.0.1, NixOS:0.3.0.1, Stackage:0.3.0.1
Downloads 3060 total (161 in the last 30 days)
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Status Docs available [build log]
Last success reported on 2018-07-19 [all 1 reports]
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