[](https://hackage.haskell.org/package/data-diverse)
[](http://travis-ci.org/louispan/data-diverse)
"Data.Diverse.Many" is an extensible record for any size encoded efficiently as (Seq Any).
"Data.Diverse.Which" polymorphic variant of possibilities encoded as (Int, Any).
Provides getters, setters, projection, injection, folds, and catamorphisms;
accessed by type or index or label.
Refer to [ManySpec.hs](https://github.com/louispan/data-diverse/blob/master/test/Data/Diverse/ManySpec.hs) and [WhichSpec.hs](https://github.com/louispan/data-diverse/blob/master/test/Data/Diverse/WhichSpec.hs) for example usages.
Iso, Lens and Prisms are provided in [data-diverse-lens](http://hackage.haskell.org/package/data-diverse-lens)
# Changelog
* 1.0.0.0
- The exposed api shouldn't break, but there are a lot of internal changes.
- Added `AFunctor` which can map over the types in the 'Many' <https://github.com/louispan/data-diverse/issues/5>.
- Added friendlier type synomyns `Collect` and `CollectN` for `collect` and `collectN`
- Expose type of 'Collector' and 'CollectorN'
- Replace type parameter `r` from `Case` typeclass with `CaseResult` type family.
- Replaced `CasesResult` type function with `IsAll` and `CasesResults` type functions.
- All `CaseXxx` type variables now end with r xs.
- All `CaseXxxN` type variables now end with r n xs.
* 0.11.0.0
- Added `impossible` modelled after `Data.Void.absurd` <https://github.com/louispan/data-diverse/issues/4>
- Removed `zilch` so `Which '[]` is uninhabited like `Data.Void.Void`, making 'impossible' safe to use.
- Removed `Monoid` and changed `Show`, `Read` and `Generic` instances for `Which '[]` to be partial
just like Data.Void.Void.
- Added instance Reduce (Which '[]) (Switcher c '[] r), which follows from 'impossible'.
* 0.10.0.0
- Renamed `Switch` to `Switcher`. Switch is now a type synonym for `switch` constraints
- Added CasesResult type family to help infer the result of `cases`
- Added Semigroup and Monoid instances for all Many xs.
- Added Maybe versions of trial, and reinterpret
- Renamed `reinterpetN` to `reinterpretN'`
- Renamed `impossible` to `zilch`.
- Allowed `reintepret`ing and `diversify`ing `zilch` to `zilch`
- Removed zipped type variable from `Amend` constraints.
- Removed r type variable from `Reduce` typeclass.
- Rearranged type variables in `fetch`, `replace`, `pick`, `trial`, `Diversify` type parameters,
so the type variable ordering is consistently smaller to larger, ie. 'x', 'xs', 'branch', 'tree'
- Added `diversify'` for allowing rearranging the types only.
* 0.9.0.1
- Fixed GHC 8.2.1 test failure due to changed TypeRep show instance.
* 0.9.0.0
- Breaking changes: Renamed Many.sliceL/R to Many.viewf/b
- Renamed TypeLevel.Internal.MissingImpl to IsUniqueImpl.
- Added postifx' with SnocUnique and append' with AppendUnique.
- Added Semigroup & Monoid instances for `Many '[]` and `Which '[]`
- Fixed GHC 8.2 compile error with importing GHC.Prim (Any)
* 0.8.1.0
- Added NFData instance for Which.
- Forgot to expose Many.sliceL and Many.sliceR.
* 0.8.0.0
- Changed internal representation to (Data.Seq Any) for a further 2x append speedup.
- Added NFData instance for Many.
* 0.7.0.0
- Removed NOINLINE pragmas.
- Changed internal representation to (Int, Data.IntMap Any) for a 2.5x append speedup.
* 0.6.0.0
- Moved lens to data-diverse-lens
* 0.5.0.0
- Renamed type level functions module from Type to TypeLevel
* 0.4.0.0
- Removed Emit typeclass, breaking renames. Added label accessors.
* 0.1.0.0
- Initial version represented as (Int, Data.Map Int Any)