name: free-functors
version: 1.2
synopsis: Free functors, adjoint to functors that forget class constraints.
description: A free functor is a left adjoint to a forgetful functor. It used to be the case
that the only category that was easy to work with in Haskell was Hask itself, so
there were no interesting forgetful functors.
.
But the new ConstraintKinds feature of GHC provides an easy way of creating
subcategories of Hask. That brings interesting opportunities for free (and cofree) functors.
.
The examples directory contains an implementation of non-empty lists as free semigroups,
and automata as free actions. The standard example of free higher order functors is free monads,
and this definition can be found in Data.Functor.HFree.
category: Data, Math
license: BSD3
license-file: LICENSE
author: Sjoerd Visscher
maintainer: sjoerd@w3future.com
stability: experimental
homepage: https://github.com/sjoerdvisscher/free-functors
bug-reports: https://github.com/sjoerdvisscher/free-functors/issues
build-type: Simple
cabal-version: >= 1.10
tested-with: GHC==9.0.0.20200925, GHC==8.10.2
extra-source-files:
examples/*.hs
CHANGELOG
Library
HS-Source-Dirs:
src
exposed-modules:
Data.Functor.Cofree,
Data.Functor.Cofree.Internal,
Data.Functor.Free,
Data.Functor.Free.Internal,
Data.Functor.HCofree,
Data.Functor.HFree,
Data.Functor.HHCofree,
Data.Functor.HHFree
default-language:
Haskell2010
build-depends:
base >= 4.14 && < 4.16,
template-haskell >= 2.16 && < 2.18,
transformers == 0.5.*,
comonad == 5.*,
derive-lifted-instances >= 0.2.2 && < 0.3,
contravariant == 1.5.*,
bifunctors == 5.*,
profunctors == 5.*
source-repository head
type: git
location: git://github.com/sjoerdvisscher/free-functors.git