[Haskell-cafe] Re: Designing an object model in Haskell (RESOLVED)

[John Ky]

Hi all,

I'm now using existential types.  I avoided learning about them because the
name sounded so highly technical and obscure it did not occur to me they
could be related to OO.

Thanks,

-John

On 12/7/06, John Ky <[EMAIL PROTECTED]> wrote:

Hi,

I've got an object model that I have a difficult time conceptualising how
it might look like in Haskell:

class Element { }

class Inline : Element { }

class ParentInline : Inline {
   List<Inline> children;
}

class Bold : ParentInline { }
class Underline : ParentInline { }

class Link : ParentInline {
   String link;
}

class Text : Inline {
   String text;
}

class Block : Element { }

class Paragraph : Block {
   List<Inline> paragraph;
}

class Heading : Block {
   List<Inline> heading;
}

class Document : Element {
   List<Block> blocks;
}

How best to represent this OO data model in Haskell?

Thanks

-John

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