[Haskell-beginners] interface/abstract class: what is the haskell way?

[Daniel Trstenjak]

Hi Emmanuel,

On Fri, Feb 08, 2013 at 01:51:26PM +0100, Emmanuel Touzery wrote:
> But that way I must still have public getEventProvider() function which
> returns the record, that I call by convention without some compiler
> enforcement, which doesn't sound right.

In some way you have to tell your program the available providers. How
should a compiler enforce this?

> I think what I am trying to achieve is a very common problem and I maybe
> suggested a bit too strongly how I would code it in OO languages, maybe it
> should be arranged completely differently in idiomatic haskell?

I think that the 'record of functions' is quite idiomatic Haskell for
this use case.

> Otherwise which Oleg as you talking about, maybe I would read that original
> post too.

I had pretty much the same issue and Oleg gave pretty much the same answer.

And there's really only one Oleg ;): http://okmij.org/ftp/

There's no way you could miss him hanging around in Haskell land for some time.


Greetings,
Daniel