Hi, Am Donnerstag, den 03.12.2009, 10:22 -0800 schrieb yair...@gmail.com: > > I guess TH could probably do this. > > I think this does what you wish for: > http://hackage.haskell.org/packages/archive/peakachu/0.2/doc/html/Data-Newtype.html > > Example: > > $(mkWithNewtypeFuncs [2] ''ZipList) > > withZipList2 (<*>) [(+3), (*3)] [6, 7] > [9, 21] > > $(mkInNewtypeFuncs [2] ''ZipList) > > getZipList $ inZipList2 (++) (ZipList "hello ") (ZipList "world") > > "hello world" > > in some future this won't be in this unrelated "peakachu" package, and > be incorporated into Neil M's derive. > but for now this is where you can find it.
Nice, and close. It seems it does not handle the datatype in arbitrary positions in the type (as in Foo -> ( a -> Either Foo ())) -> (Foo, ())). But thanks for the pointer. Maybe I should give it a shot. Greetings, Joachim -- Joachim Breitner e-Mail: m...@joachim-breitner.de Homepage: http://www.joachim-breitner.de ICQ#: 74513189 Jabber-ID: nome...@joachim-breitner.de
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