* Simon Hengel <s...@typeful.net> [2012-03-08 13:20:22+0100] > On Thu, Mar 08, 2012 at 12:54:13PM +0200, Roman Cheplyaka wrote: > > * Simon Hengel <s...@typeful.net> [2012-03-08 11:48:41+0100] > > > On Thu, Mar 08, 2012 at 12:18:56PM +0200, Roman Cheplyaka wrote: > > > > If it's fine to depend on FunDeps, you can use ListLike. > > > > http://hackage.haskell.org/package/ListLike > > > > > > How would that help with toText? > > > > toText = fromListLike > > > > (ListLike instance for Text is provided by the listlike-instances > > package.) > > Ah, the listlike-instances package is the missing piece. > > Not sure if this is going somewhere. But I'm still trying to get a > clear picture of the performance implications. > > Say I have a newtype-wrapped ByteString that I would decode to > String/Text using UTF-8: > > newtype Value = Value ByteString > > Would it be possible to go from Value to Text by essentially ending up > with Data.Text.Encoding.decodeUtf8 at runtime (e.g. by using rewrite > rules)?
You can do that, but it will work only if your functions are specialized enough at compile time. -- Roman I. Cheplyaka :: http://ro-che.info/ _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
