12 Dec
2009
12 Dec
'09
11:18 a.m.
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