[MirageOS-devel] C++ library to OCaml: OCaml objects

[Steven Luland <psxsl6@xxxxxxxxxxxxxxxx>]

I am trying to use ctypes to convert a C++ library for use with OCaml. For the 
most part, I have had some success, but I'm struggling with using an OCaml 
Object as a representation for the C++ object:


    let value_id = object
        method get_command_class_id =
            foreign "GetCommandClassId" (void @-> returning int)
    end


Above is the object that I would like to use. I feel that this is the easiest 
way to represent the ValueID in my OCaml code. Next, I wanted to set the type 
to work with the # notation that OCaml uses for objects.

    type value_id = < get_command_class_id : int >
    let value_id : value_id typ = ptr void

With this, I am getting an error:

    Error: This expression has type unit ptr typ
           but an expression was expected of type value_id typ
           Type iunit ptr = (unit, [ `C ]) pointer is not compatible with type
             value_id = < get_command_class_id : int >

Does anyone know how I can rectify this issue? My OCaml still isn't that 
strong, so any feedback is appreciated.

Thanks,

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