typerep-map: Efficient implementation of a dependent map with types as keys

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Warnings:

'ghc-options: -O2' is rarely needed. Check that it is giving a real benefit and not just imposing longer compile times on your users.

A dependent map from type representations to values of these types.

Here is an illustration of such a map:

    TMap
---------------
 Int  -> 5
 Bool -> True
 Char -> 'x'

In addition to TMap, we provide TypeRepMap parametrized by a vinyl-style interpretation. This data structure is equivalent to DMap TypeRep, but with significantly more efficient lookups.

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Properties

Versions	0.1.0, 0.2.0, 0.2.0, 0.3.0, 0.3.1, 0.3.2, 0.3.3.0, 0.4.0.0, 0.5.0.0, 0.6.0.0
Change log	CHANGELOG.md
Dependencies	base (>=4.9 && <5), containers, ghc-prim, primitive (>=0.6.4), vector [details]
License	MIT
Copyright	2017-2018 Kowainik
Author	Kowainik, Vladislav Zavialov
Maintainer	xrom.xkov@gmail.com
Category	Data, Data Structures, Types
Home page	https://github.com/kowainik/typerep-map
Bug tracker	https://github.com/kowainik/typerep-map/issues
Source repo	head: git clone https://github.com/kowainik/typerep-map.git
Uploaded	by shersh at 2018-07-28T05:02:34Z

library typerep-map

Modules

[Index] [Quick Jump]

Data
- Data.TMap
- Data.TypeRepMap
  - Data.TypeRepMap.Internal

library typerep-map:typerep-extra-impls

Modules

[Index] [Quick Jump]

Data
- TypeRep

Downloads

typerep-map-0.2.0.tar.gz [browse] (Cabal source package)
Package description (as included in the package)

Maintainer's Corner

Package maintainers

vrom911

For package maintainers and hackage trustees

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Readme for typerep-map-0.2.0

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typerep-map

typerep-map introduces TMap and TypeRepMap — data structures like Map, but where types serve as keys, and values have the types specified in the corresponding key spots.

Usage example

ghci> import Data.TMap

ghci> tm = insert True $ one (42 :: Int)

ghci> size tm
2

ghci> res = lookup tm

ghci> res :: Maybe Int
Just 42

ghci> res :: Maybe Bool
Just True

ghci> res :: Maybe String
Nothing

ghci> lookup (insert "hello" tm) :: Maybe String
Just "hello"

ghci> member @Int tm
True

ghci> tm' = delete @Int tm

ghci> member @Int tm'
False

Benchmarks

Tables below contain comparision with DMap TypeRep of ten lookup operations on structure with size 10^4:

	ghc-8.2.2	ghc-8.4.3
`DMap TypeRep`	517.5 ns	779.9 ns
`typerep-map`	205.3 ns	187.2 ns

ghc-8.2.2	ghc-8.4.3