The reflection package
This package provides an implementation of the ideas presented in the paper "Functional Pearl: Implicit Configurations" by Oleg Kiselyov and Chung-chieh Shan. However, the API has been modified to use Rank2Types and TypeFamilies and the implementation has been streamlined to improve performance.
The original paper can be obtained from http://www.cs.rutgers.edu/~ccshan/prepose/prepose.pdf
Changes in 0.9:
Faster internal implementation.
Removed ReifiedNum, reflectNum, and reifyIntegral; reify and reflect are considerably faster than the special case combinators were.
Changes in 0.8:
Switched to using type families to avoid a problem where the user could cast Proxy (s a) -> Proxy (s b) and get back a values with the wrong type under the API in effect from 0.6. This API yields a much nicer example as well.
Removed reflectT as it no longer makes sense.
Added a more advanced example example/Constraints.hs using constraint kinds.
Changes in 0.7:
Uses a much simpler construction where reify now converts a StablePtr to an IntPtr and reifies that directly as an integral type rather than serializing and storing the StablePtr as a list of bytes as proposed in the original paper.
Removed ReifiedStorable and ReifiedNums.
Since we have so many fewer classes now, Data.Reflection.Internal was merged back into Data.Reflection
Changes in 0.6:
Removed the dependency on multiparameter type classes, functional dependencies, and flexible instances, by making Reifies a single parameter type class in the same fashion as ReifiesStorable.
Moved the building blocks to Data.Reflection.Internal to reduce API clutter.
Changes in 0.5:
Generalized the type signatures in reflect to allow you to pass any type with kind * -> * wrapped around the desired type as the phantom type argument rather than just a Proxy.
Changes in 0.4:
Converted from Data.Tagged to using Data.Proxy for reflection. This reduces the need for helper functions and scoped type variables in user code.
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|Versions||0.0.0, 0.1.0, 0.1.1, 0.2.0, 0.3.0, 0.3.1, 0.3.2, 0.3.3, 0.3.5, 0.4.0, 0.4.0.1, 0.4.0.2, 0.4.1, 0.4.1.1, 0.5, 0.5.0.1, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.1.1, 1.1.2, 1.1.3, 1.1.4, 1.1.5, 126.96.36.199, 1.1.6, 1.1.7, 188.8.131.52, 1.3, 1.3.1, 1.3.2, 1.4, 1.5.1, 184.108.40.206, 220.127.116.11, 1.5.2, 18.104.22.168, 2, 2.1, 2.1.1, 22.214.171.124, 2.1.2|
|Dependencies||base (>=4.4 && <5), tagged (>=0.2.3 && <0.3) [details]|
|Copyright||2009-2012 Edward A. Kmett, 2012 Elliott Hird, 2004 Oleg Kiselyov and Chung-chieh Shan|
|Author||Edward A. Kmett, Oleg Kiselyov and Chung-chieh Shan|
|Maintainer||Edward A. Kmett <email@example.com>|
|Category||Data, Reflection, Dependent Types|
|Source repository||head: git clone git://github.com/ekmett/reflection.git|
|Uploaded||Sat Apr 7 08:04:08 UTC 2012 by EdwardKmett|
|Updated||Sun Jan 3 09:21:16 UTC 2016 by HerbertValerioRiedel to revision 1|
|Distributions||Arch:2.1.2, Debian:126.96.36.199, Fedora:2.1.2, FreeBSD:2, LTSHaskell:2.1.2, NixOS:2.1.2, Stackage:2.1.2, Tumbleweed:2.1.2|
|Downloads||96313 total (200 in the last 30 days)|
|Status||Docs uploaded by user
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