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[Repo Assist] Export SetProperties from Data.Type.Set and improve its documentation #44

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[Repo Assist] Export SetProperties from Data.Type.Set and improve its documentation #44

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8 changes: 6 additions & 2 deletions src/Data/Type/Set.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@

module Data.Type.Set (Set(..), Union, Unionable, union, quicksort, append,
Sort, Sortable, (:++), split, Split, Cmp, Filter, Filter', Flag(..),
Nub, Nubable(..), AsSet, asSet, IsSet, Subset(..),
Nub, Nubable(..), AsSet, asSet, IsSet, SetProperties, Subset(..),
Delete(..), Proxy(..), remove, Remove, (:\),
Elem(..), Member(..), MemberP, NonMember) where

Expand Down Expand Up @@ -75,7 +75,11 @@ asSet x = nub (quicksort x)
{-| Predicate to check if in the set form -}
type IsSet s = (s ~ Nub (Sort s))

{-| Useful properties to be able to refer to someties -}
{-| Useful set-theoretic identity constraints for a set @f@.
Bundles facts such as @Union f '[] ~ f@, @Union '[] f ~ f@, and @Union f f ~ f@,
along with the corresponding 'Unionable' instances (which in turn supply 'Sortable'
and 'Nubable' witnesses). Useful for reducing boilerplate in function constraints
when you need to work with a set and the empty set, or union a set with itself. -}
type SetProperties (f :: [k]) =
( Union f ('[] :: [k]) ~ f,
Split f ('[] :: [k]) f,
Expand Down