Hi Christian, No good examples I'm afraid. There are a few notes in README.txt (I just pushed a few more notes). If you follow the process I'd welcome any improvements to the documentation. Thanks, Neil On Tue, Mar 2, 2010 at 1:50 PM, Christian Hoener zu Siederdissen wrote:

Thanks everybody for the answers.

Right now, it looks like this: the indextype is abstracted out and I plan for Data.Ix and my own Data.FastIx (or however to call it).

As I don't plan on creating all instances myself, Neils derive package looks good -- once I understand it completely; which I need to as I need instances of my own class. Is there a tutorial on creating instances for own stuff, or should I go by the examples like Functor?

The code in AdaptiveTuple has one advantage: it looks easier to get started producing instances. (No need to get to know another package).

Btw. it is a bit disappointing (for me) that Data.Ix is almost as fast as my FastIx ;-) (as in: most people don't care about the difference)

Something else: was there a resource about library naming? otherwise it is going to be vector-ixtables (someone a better idea?)

Thanks again, Christian

On 03/02/2010 02:30 PM, Neil Mitchell wrote:

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Hi

Derive generates declarations - they can be instances, classes, data types, functions, type synonyms etc.

Thanks, Neil

On Mon, Mar 1, 2010 at 10:32 AM, John Lato wrote:

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From: Christian H?ner zu Siederdissen

Hi,

I am thinking about how to easily generate instances for a class. Each instance is a tuple with 1 or more elements. In addition there is a second tuple with the same number of elements but different type. This means getting longer and longer chains of something like (...,x3*x2,x2,0).

- template haskell? - CPP and macros?

Consider arrays with fast access like Data.Vector, but with higher dimensionality. Basically, I want (!) to fuse when used in Data.Vector code.

(shameless plug) You may want to look at my AdaptiveTuple package, which does something very similar to this.  I used Template Haskell because AFAIK neither generic approaches nor DrIFT/Derive will generate data decls.

If all you need are the instances, then DrIFT or Derive would be my recommendations.

Cheers, John _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users

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