On 30/10/09 05:32, Rogan Creswick wrote:
On Thu, Oct 29, 2009 at 6:54 PM, Magicloud Magiclouds
<magicloud.magiclo...@gmail.com> wrote:
My concern here is about the data member inheriting. In OOP, when I
inherit a class, I also got the members of it. But in haskell, how to
inherit a "data"?
[..]
The point of that whole rant is that extending data-bearing classes isn't
necessarily a good idea, so before trying to find a way to do it with
haskell, it may be better to just encapsulate another data type, which is
trivial:
data InnerThing = A | B | C
data OuterThing = Outer { innerThing :: InnerThing, otherField :: Int }
IIRC James Gosling once said that if he were to design Java today he would
leave out classes. I suppose partly due to many of the issues with "data
inheritance".
/M
--
Magnus Therning (OpenPGP: 0xAB4DFBA4)
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http://therning.org/magnus identi.ca|twitter: magthe
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