Hackage :: [Package]

data-category: Restricted categories

[ bsd3, library, math ] [ Propose Tags ]

Data-category is a collection of categories, and some categorical constructions on them.

You can restrict the types of the objects of your category by using a GADT for the arrow type. To be able to proof to the compiler that a type is an object in some category, objects also need to be represented at the value level. The corresponding identity arrow of the object is used for that.

See the Monoid, Boolean and Product categories for some examples.

Note: Strictly speaking this package defines Hask-enriched categories, not ordinary categories (which are Set-enriched.) In practice this means we are allowed to ignore undefined (f.e. when talking about uniqueness of morphisms), and we can treat the categories as normal categories.

Versions 0.0.1, 0.0.2, 0.0.3, 0.0.3.1, 0.1.0, 0.2.0, 0.3.0, 0.3.0.1, 0.3.0.2, 0.3.1, 0.3.1.1, 0.4, 0.4.1, 0.5.0, 0.5.1, 0.5.1.0, 0.5.1.1, 0.6.0, 0.6.1, 0.6.2, 0.7
Dependencies base (>=3 && <5) [details]
License BSD-3-Clause
Author Sjoerd Visscher
Maintainer sjoerd@w3future.com
Category Data
Home page http://github.com/sjoerdvisscher/data-category
Bug tracker http://github.com/sjoerdvisscher/data-category/issues
Source repo head: git clone git://github.com/sjoerdvisscher/data-category.git
Uploaded by SjoerdVisscher at Thu Mar 3 15:43:51 UTC 2011
Distributions NixOS:0.7
Downloads 7371 total (44 in the last 30 days)
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