cluss alternatives and similar packages

Based on the "Constraints" category.
Alternatively, view cluss alternatives based on common mentions on social networks and blogs.

constraints

9.1 5.4 cluss VS constraints

Tools for programming with ConstraintKinds in GHC
mios

7.7 0.0 cluss VS mios

A SAT solver written in Haskell.

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constraints-emerge

7.0 0.0 cluss VS constraints-emerge

📤 defer instance resolution until runtime
constraints-deriving

5.6 0.0 cluss VS constraints-deriving

Programmatically create new instances using core-to-core plugins
superconstraints

3.9 0.0 cluss VS superconstraints

Access an instance's constraints
exists

3.1 0.0 cluss VS exists

Existential datatypes holding evidence of constraints

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README

cluss

simple alternative to type classes

A cluss enables you to achieve function overloading, or ad-hoc polymorphism, without creating a new type class.

In order to give ad-hoc polymorphism to a type variable a, you simply use In with a list of "type patterns" like In [Type T, ...] a, which indicates that the type matches some of the patterns; which is analogous to a type class indicating that a type matches some of its "instances". The constraint In [Type T, ...] a is what we call a "cluss".

Clusses can easily be used in a nested way and even be recursive; therefore, they are expressive enough to imitate Haskell-98-style type classes.

Clusses, however, go beyond a mere alternative to type classes. They have closed and prioritized instances and open methods, while type classes have open and unprioritized instances and closed methods. Those properties give clusses the advantages different from type classes:

You can judge whether a type a belongs to a cluss In as, on some level, writing Has as a, since cluss instances are closed.
You can make cluss instances more flexibly, without causing overlapping instances or incoherent instances, since cluss instances are prioritized.
You can create new methods for clusses anywhere in any module, since cluss methods are open.

More information can be found in the hackage's haddock or the updated haddock.

The latest version is available at https://hackage.haskell.org/package/cluss.