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

For TH look also at http://www.mail-archive.com/haskell-cafe@haskell.org/msg13057.html 2011/10/27 Magicloud Magiclouds

On Thu, Oct 27, 2011 at 1:57 AM, Brent Yorgey wrote:

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On Wed, Oct 26, 2011 at 09:10:23PM +0400, MigMit wrote:

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Can't be done. Even if this particular module doesn't contain "instance Class Type", it's quite possible that the said instance would be defined in another module, about which this one knows nothing about.

That doesn't mean it can't be done, only that you would have to be explicit about which modules to look in.

-Brent

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May I know more about this? Have not used TH on this subject.

-- 竹密岂妨流水过 山高哪阻野云飞

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