Re: [Caml-list] Re: Define class and sum type in one time

[Pierre-Alexandre Voye <ontologiae@gmail.com>]

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So, this is impossible  ?   :

class maclasse = object(self)
  val mutable valeur = (None : truc option)
  method getValeur = valeur
end
and
truc = Machin of (maclasse->int) | Recur of truc;;

?
(three attempt to write a correct example of my problem.. All apologies !)

2011/3/17 Guillaume Yziquel <guillaume.yziquel@citycable.ch>

> Le Thursday 17 Mar 2011 à 11:33:44 (+0100), Pierre-Alexandre Voye a écrit :
> >    My example would be better with this :
> >    class machin = object(self)
> >    Â  val mutable valeur = (None : truc option)
> >    Â  method getValeur = valeur
> >    end
> >    and
> >    truc = Machin of (int->int) | Recur of truc;;
> >    The object need the type defined
>
> You cannot declare a class and a type with an 'and'. Either two classes,
> or two types.
>
> Simply declare truc before machin.
>
> type truc = Machin of int -> int | Recur of truc
>
> class machin = object
>
>        val mutable valeur : truc option = None
>
>        method getValeur = valeur
>
> end
>
> --
>      Guillaume Yziquel
>



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