[Haskell-cafe] template haskell for typeclass synonyms

Gábor Lehel illissius at gmail.com
Mon Nov 1 14:04:24 EDT 2010

On Mon, Nov 1, 2010 at 6:09 PM, Christopher Done
<chrisdone at googlemail.com> wrote:
> On 1 November 2010 17:53, Paolino <paolo.veronelli at gmail.com> wrote:
>> I'd like to have a template haskell function that take some constraints and
>> a class name and write an empty class from those and relative empty instance
>> to simulate typeclass synonyms.
>> As I've never written TH and couldn't find a easily adaptable code around, I
>> ask here for the code, or some hints on how to arrive there.
> I took Justin Bailey's haskelldb-th library as a TH example to work
> from and rewrote one TH function to try my hand at it, it's quite easy
> to follow with a simple example:
> http://hpaste.org/paste/41035/demo
> Maybe this is enough example to get you going. The rest you can find
> syntax parts from the TH Haddock documentation.

A useful FYI: the API docs are (almost) completely devoid of comments,
but if you click to see the source, it does have some additional
information in comments there, just not Haddock-formatted.

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