[Haskell-cafe] Is it possible to get the information of instances of a type?

[Nathan Howell]

On Wed, Oct 26, 2011 at 6:53 AM, Magicloud Magiclouds <
magicloud.magiclouds at gmail.com> wrote:

>  But in Haskell, could I write a code to list the classes that a type
> instanced?
>  TemplateHaskell as well.
>

It's possible with TemplateHaskell. Look at classInstances and the ClassI
data constructor.

http://haskell.org/ghc/docs/7.0.4/html/libraries/template-haskell-2.5.0.0/Language-Haskell-TH.html#v:classInstances
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