The trivial-constraint package

[ Tags: constraints, gpl, library ] [ Propose Tags ]

Since GHC 7.4, constraints are first-class: we have the constraint kind, and thus type-classes have a kind such as * -> Constraint.

These can be used as parameters to data types. They also can be combined quite nicely,

type NewConstraint a = (Constraint1 a, Constraint2 a)

however you always need to start with a plain old type class when building constraints.

This library provides a type class that is not really a constraint at all, so you can "start from zero" with building up a custom constraint. Also its opposite (a constraint that no type can ever fulfill).

Properties

Versions 0.1.0.0, 0.2.0.0, 0.3.0.0, 0.4.0.0
Dependencies base (>=4.5 && <5) [details]
License GPL-3
Author Justus Sagemüller
Maintainer sagemuej@smail.uni-koeln.de
Category Constraints
Home page https://github.com/leftaroundabout/trivial-constraint
Uploaded Sat Jan 23 00:18:44 UTC 2016 by leftaroundabout
Distributions NixOS:0.4.0.0
Downloads 735 total (6 in the last 30 days)
Rating (no votes yet) [estimated by rule of succession]
Your Rating
  • λ
  • λ
  • λ
Status Docs uploaded by user
Build status unknown [no reports yet]
Hackage Matrix CI

Modules

[Index]

Downloads

Maintainer's Corner

For package maintainers and hackage trustees