Re: [Caml-list] weird compilation problem

[Olivier Ricordeau <olivier.ricordeau@wanadoo.fr>]

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Olivier Andrieu wrote:
>  Olivier Ricordeau [Saturday 6 September 2003] :
>  > Hi!
>  > I have a weird compilation problem. ocamlc complains that it doesn't
>  > find a class, and I really don't know what mistake I made...
>  > FYI, it used to compile fine until I tried to write some interfaces.
>
>  > If someone has an idea of what I did wrong, I'm interested! I'm quite
>  > stuck for now.
>
> [ je te l'ai déjà dit mais bon ... ]
>
> You're confusing class specification and class type.
>
> In corpus.ml you define a class, but in corpus.mli you put a class
> type. A class type gives a "signature" of a class, listing its methods
> and instance variable but a class type doesn't necessarily come with
> an implementation (an actual class). So, when you try to use your
> Corpus module, you only see a class type and you cannot create an
> object with new or define a derived class. What you want is a class
> specification.
>
>
> Class definition (in .ml files) :
>  class foo = object method bar = some_expr end
>
> Class specification (in .mli files) :
>  class foo : object method bar : some_type_expr end
>
> Class type (in .ml and/or .mli files) :
>  class type foo = object method bar : some_type_expr end
>
>
> Also, you do not really need to write a .mli if you're not hiding
> anything from the .ml file.
>

It works! Thx a lot.

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