proxy-kindness: A library for kind-polymorphic manipulation and inspection of Proxy values

[ bsd3, data, library ] [ Propose Tags ]

It can be useful (especially with PolyKinds) to get the "bare" type (e.g. Either) of some parameterized type (e.g. Either Char Int). This library provides closed classes that can strip and reapply type arguments, as well as useful utility functions. Here are some examples:

Force Left 1 to be of type Either Float a using a partially-applied Proxy.

>>> let t = (Left 1) `asApplied` (Proxy :: Proxy (Either Float))
>>> :t t
t :: Either Float a

Do the same, but illustrating type application with ap

>>> let t0 = (Left 1) `asApplied` ((Proxy :: Proxy Either) `ap` (Proxy :: Proxy Float))
>>> :t t0
t0 :: Either Float a

Force polymorphic undefined to some polymorphic Either type, the base type of t defined above.

>>> let u = undefined `asApplied` (unappliedOf t)
>>> :t u
u :: Either a a1
Versions 0.1
Dependencies base (==4.6.*), tagged [details]
License BSD-3-Clause
Author Brandon Simmons
Maintainer brandon.m.simmons@gmail.com
Category Data
Home page https://github.com/jberryman/proxy-kindness
Source repo head: git clone https://github.com/jberryman/proxy-kindness.git -b master
Uploaded by BrandonSimmons at Fri Nov 15 02:19:41 UTC 2013
Distributions NixOS:0.1
Downloads 533 total (20 in the last 30 days)
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Status Docs available [build log]
Successful builds reported [all 1 reports]
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