Re: Easily generating efficient instances for classes
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 jwl...@gmail.com wrote: 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 ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Easily generating efficient instances for classes
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: 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 jwl...@gmail.com wrote: 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 ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Easily generating efficient instances for classes
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
Re: Easily generating efficient instances for classes
As Bulat says, the Derive package might be a good way to go. I am happy to accept any new derivations, and you get lots of things for free - including writing your code using the nice haskell-src-exts library, preprocessor support, TH support etc. Thanks, Neil On Thu, Feb 25, 2010 at 8:57 AM, Bulat Ziganshin bulat.zigans...@gmail.com wrote: Hello Christian, Thursday, February 25, 2010, 3:57:44 AM, you wrote: I am thinking about how to easily generate instances for a class. Each it's called generic programing. just a few overviews on this topic: Libraries for Generic Programming in Haskell http://www.cs.uu.nl/research/techreps/repo/CS-2008/2008-025.pdf Comparing Approaches to Generic Programming in Haskell http://www.cs.uu.nl/~johanj/publications/ComparingGP.pdf Derive package is probably the easiest way Template Haskell is also good although a bit too complex. my own pets: http://www.haskell.org/bz/th3.htm http://www.haskell.org/bz/thdoc.htm -- Best regards, Bulat mailto:bulat.zigans...@gmail.com ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
