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1.6 KiB
1.6 KiB
Free Category
This package contains efficient free categories. There are two presentations:
- using realtime queues (C. Okasaki 'Pure Functional Data Structures')
- using continuation passing style
Free arrows and free Kleisli categories are also included.
Free categories are useful to model state machines in a simple yet type safe
manner. 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.