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Generating nested data types at runtimeHi, I'm currently implementing an algorithm which allows one to synthesise coalgebras given various local/global specifications, these being coalgebras of a covariant endofunctor T on Set^m where Set is the category of sets and m >= 0. I have a problem regarding the genericity of what I am trying to implement, which I hope someone can shed some light on. Although I'm using Haskell, I'd be interested if any other languages are capable of what I ask. My problem is not with the algorithm itself but rather with an initial preprocessing stage. In general terms I want to construct a collection of interleaving data types given some specification of how they need to be interleaved. This needs to happen at runtime. Previously for my MSc I implemented a fragment of this algorithm, at that time I got round this problem by generating the Haskell code with a script  kind of an ugly solution. On the other hand I guess its hardly a common thing for the user to create their own data types. I'd very much appreciate any pointers, Cheers, Rob By rob myers at 20090223 01:01  LtU Forum  previous forum topic  next forum topic  other blogs  4345 reads

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