Re: [Haskell-cafe] Preserving data type information

Hi, Stephen. Thanks a lot — HList paper gave me a good overview of possible soultions. For the first try I will stuck with Data.Dynamic. On Sat, Dec 12, 2009 at 7:18 PM, Stephen Tetley wrote:

Hi Andrey

Dynamic types are a possibility, if you want to handle an 'open set' of types:

http://www.haskell.org/ghc/docs/6.10.3/html/libraries/base/Data-Dynamic.html & http://people.cs.uu.nl/arthurb/dynamic.html

Although I don't see your use case as needing heterogeneous lists, section 2 of the HList paper enumerates the design options available for 'open types' (the authors conclude against dynamics in this case).

http://homepages.cwi.nl/~ralf/HList/

Best wishes

Stephen

-- С уважением, Андрей Попп. +7 911 740 24 91