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Free categories, free arrows and free categories with monadic actions
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@ggreif thanks for proofreading! |
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shell.nix |
Free Category
This package introduces variouos presentations of free categories in Haskell.
Free categories are useful to model state machines in a simple yet type safe
way and for that purpose Kleisli
categroies are a very useful target which
allows to include monadic computations. This packge contains a useful
generalisation of Kliesli
categories captured by EffCategory
class
(effectful categories), and a (free) transformer which lifts a category to
an effectful one.
Some examples
- LoginStateMachine:
based on State Machines All The Way
Down by Edwin Bradly, 2017 You
can run it with
cabal new-run examples:login-state-machine
. - Read more here on a simple example of a finite state machine encoded using a free category using a simple GADT.
- Another example.
- Blog post on Keleisli categories.