Hi, I'm not sure I understand your question. But if you mean that you want to retrieve the type variable names, as they were defined in the source, then I can tell you that the generic deriving mechanism cannot do this.
Cheers, Pedro On Sun, Nov 6, 2011 at 14:35, Magicloud Magiclouds < magicloud.magiclo...@gmail.com> wrote: > Hi, > I'd like to simpler the work of deriving MyClass. And I have two > ways to do: TemplateHaskell "$(derivingMyClass)", or Generic "deriving > (MyClass)". > Since I need to get the type name in the deriving, then I met this > question: If I have "data A b = C b", then with TemplateHaskell, the > type would be "VarT b", which means at compile time, I cannot get the > exact type, so the type name would be "b". > So I wonder if this could be resolved by TemplateHaskell, or Generic > is the only choice. > > PS: I have not tried to do this in Generic. > -- > 竹密岂妨流水过 > 山高哪阻野云飞 > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe >
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