reflection: Functional Pearl: Implicit Configurations

[ bsd3, data, dependent-types, library, reflection ] [ Propose Tags ]

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.

  • Added reflectT

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 [RSS] 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, 1.1.5.1, 1.1.6, 1.1.7, 1.2.0.1, 1.3, 1.3.1, 1.3.2, 1.4, 1.5.1, 1.5.1.1, 1.5.1.2, 1.5.2, 1.5.2.1, 2, 2.1, 2.1.1, 2.1.1.1, 2.1.2, 2.1.3, 2.1.4, 2.1.5, 2.1.6
Dependencies base (>=4.4 && <5), tagged (>=0.2.3 && <0.3) [details]
License BSD-3-Clause
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 <ekmett@gmail.com>
Revised Revision 1 made by HerbertValerioRiedel at 2016-01-03T09:21:16Z
Category Data, Reflection, Dependent Types
Home page http://github.com/ekmett/reflection
Source repo head: git clone git://github.com/ekmett/reflection.git
Uploaded by EdwardKmett at 2012-04-07T08:04:08Z
Distributions Arch:2.1.6, Debian:2.1.6, Fedora:2.1.6, FreeBSD:2, LTSHaskell:2.1.6, NixOS:2.1.6, Stackage:2.1.6, openSUSE:2.1.6
Downloads 205589 total (572 in the last 30 days)
Rating 2.25 (votes: 2) [estimated by Bayesian average]
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Readme for reflection-0.9

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reflection
==========

This package provides an implementation of the ideas presented in the paper

  Oleg Kiselyov and Chung-Chieh Shan, "Functional Pearl: Implicit Configurations"
  <http://www.cs.rutgers.edu/~ccshan/prepose/prepose.pdf>

However, the API has been modified to use @Rank2Types@ and @TypeFamilies@ and the
implementation has been streamlined to improve performance.