[Haskell-cafe] two type-level programming questions
1) Type families, associated types, synonyms... can anything replace the use of TypeCast for explicit instance selection? Section 2, bullet 4 of http://www.haskell.org/haskellwiki/GHC/AdvancedOverlap indicates a negative response. Any other ideas? 2) Any progress/options for kind polymorphism in instances? Thanks for your time. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] two type-level programming questions
Sort of. I believe you can use type equality constraints to replace the use of TypeCast; that is, in any code that looks like: instance TypeCast a HTrue = ... you can write instance (a ~ HTrue) = ... (at least, it has worked for me that way) This at least makes me feel a bit more monadic (warm fuzzy!) than the indecipherable magic that is the declaration of TypeCast/TypeCast'/TypeCast'' -- ryan On Thu, Dec 4, 2008 at 3:09 PM, Nicolas Frisby [EMAIL PROTECTED] wrote: 1) Type families, associated types, synonyms... can anything replace the use of TypeCast for explicit instance selection? Section 2, bullet 4 of http://www.haskell.org/haskellwiki/GHC/AdvancedOverlap indicates a negative response. Any other ideas? 2) Any progress/options for kind polymorphism in instances? Thanks for your time. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] two type-level programming questions
More monadic? -- _jsn ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] two type-level programming questions
See slide 40 of Weaing the Hair Shirt: A Retrospective on Haskell, Simon Peyton-Jones, POPL 2003 http://research.microsoft.com/Users/simonpj/papers/haskell-retrospective/index.htm -- ryan On Thu, Dec 4, 2008 at 7:04 PM, Jason Dusek [EMAIL PROTECTED] wrote: More monadic? -- _jsn ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
