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 only one extension: Rank2Types

Usage reduces to using two combinators.

reify :: a -> (forall s. Reified s => Proxy (s a) -> w) -> w
reflect :: Reified s => p (s a) -> a
ghci> reify 6 (\p -> reflect p + reflect p)
12

The argument passed along by reify is just a data Proxy t = Proxy, so all of the information needed to reconstruct your value has been moved to the type level. This enables it to be used when constructing instances (See examples/Monoid.hs). An additional combinator that may be more useful when building instances is also supplied.

reflectT :: Reified s => p s a -> a

Changes in 0.7:

Changes in 0.6:

Changes in 0.5:

Changes in 0.4:

Versions [faq] 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
Dependencies base (==4.*), tagged (>=0.2.3 && <0.3) [details]
License BSD-3-Clause
Copyright 2009 Edward A. Kmett, 2004 Oleg Kiselyov and Chung-chieh Shan
Author Edward A. Kmett, Oleg Kiselyov and Chung-chieh Shan
Maintainer Edward A. Kmett <ekmett@gmail.com>
Category Data, Reflection, Dependent Types
Home page http://www.cs.rutgers.edu/~ccshan/prepose/prepose.pdf
Source repo head: git clone git://github.com/ekmett/reflection.git
Uploaded by EdwardKmett at Sat Apr 7 00:56:12 UTC 2012
Distributions Arch:2.1.4, Debian:2.1.4, Fedora:2.1.4, FreeBSD:2, LTSHaskell:2.1.4, NixOS:2.1.4, Stackage:2.1.4, openSUSE:2.1.4
Downloads 159260 total (1121 in the last 30 days)
Rating 2.25 (votes: 2) [estimated by rule of succession]
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