reflection
Version 1.0 revision 0 uploaded by EdwardKmett.
Package meta
- Synopsis
- Functional Pearl: Implicit Configurations
- Description
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
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 1.0:
Much faster implementation available that is about 50 times faster than 0.9 and which runs purely on black magic. This version is now used by default. To turn it off install with the slow flag. If you encounter a problem with implementation, please contact the author.
Changes in 0.9:
Faster internal implementation, about 40 percent faster than 0.8.
Removed
ReifiedNum
,reflectNum
, andreifyIntegral
;reify
andreflect
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 aStablePtr
to anIntPtr
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
andReifiedNums
.Since we have so many fewer classes now,
Data.Reflection.Internal
was merged back intoData.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 asReifiesStorable
.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 aProxy
.
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.
- Author
- Edward A. Kmett, Elliott Hird, Oleg Kiselyov and Chung-chieh Shan
- Bug reports
- n/a
- Category
- Data, Reflection, Dependent Types
- Copyright
- 2009-2012 Edward A. Kmett, 2012 Elliott Hird, 2004 Oleg Kiselyov and Chung-chieh Shan
- Homepage
- http://github.com/ekmett/reflection
- Maintainer
- Edward A. Kmett <ekmett@gmail.com>
- Package URL
- n/a
- Stability
- experimental