[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 <newhoggy at gmail.com> 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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