I get

    " Error 42: Symbol Undefined
__Class_3std3dtl6common10IContainer9Container"

from the following code


interface IContainer
{
public:
    alias   uint    index_type;
    alias   uint    size_type;

public:
    class Container
        : public IContainer
    {
    public:
        bool        isEmpty();
        IEnumerator enumerate()
        {
            return new Enumerator(this.toArray());
        }

    protected:
        abstract Object[]   toArray();
    }

    alias   Container   selecting_type;

    static selecting_type   hack;

// IContainer methods
public:
    /// Denotes whether the given container is empty
    bool        isEmpty();
    /// Returns an enumerator object representing the elements of the
container
    IEnumerator enumerate();
}

Interfaces are only supposed to have member functions in them. Anything else should generate an error.

"Matthew Wilson" <admin.hat@stlsoft.dot.org> wrote in message news:cd4vbd$1ih4$1@digitaldaemon.com...
> I get
>
>     " Error 42: Symbol Undefined
> __Class_3std3dtl6common10IContainer9Container"
>
> from the following code
>
>
> interface IContainer
> {
> public:
>     alias   uint    index_type;
>     alias   uint    size_type;
>
> public:
>     class Container
>         : public IContainer
>     {
>     public:
>         bool        isEmpty();
>         IEnumerator enumerate()
>         {
>             return new Enumerator(this.toArray());
>         }
>
>     protected:
>         abstract Object[]   toArray();
>     }
>
>     alias   Container   selecting_type;
>
>     static selecting_type   hack;
>
> // IContainer methods
> public:
>     /// Denotes whether the given container is empty
>     bool        isEmpty();
>     /// Returns an enumerator object representing the elements of the
> container
>     IEnumerator enumerate();
> }
>
>
>

Wow!

If that's the case:

- I'd *like* you to enhance the lang to allow any kinds of member types,
including classes, other interfaces, static members. Given the fact that
interfaces/classes currently don't appear to have their member types accessible
to the outside world, I'm using static members + typeof as a temporary hack.
- I have to suggest that they *must* be allowed to have member aliases/typedefs.
Otherwise, DTL and other template libs are going to be
impossible/crippled/very-unobvious



"Walter" <newshound@digitalmars.com> wrote in message news:cda8ht$ssu$2@digitaldaemon.com...
> Interfaces are only supposed to have member functions in them. Anything else should generate an error.
>
> "Matthew Wilson" <admin.hat@stlsoft.dot.org> wrote in message news:cd4vbd$1ih4$1@digitaldaemon.com...
> > I get
> >
> >     " Error 42: Symbol Undefined
> > __Class_3std3dtl6common10IContainer9Container"
> >
> > from the following code
> >
> >
> > interface IContainer
> > {
> > public:
> >     alias   uint    index_type;
> >     alias   uint    size_type;
> >
> > public:
> >     class Container
> >         : public IContainer
> >     {
> >     public:
> >         bool        isEmpty();
> >         IEnumerator enumerate()
> >         {
> >             return new Enumerator(this.toArray());
> >         }
> >
> >     protected:
> >         abstract Object[]   toArray();
> >     }
> >
> >     alias   Container   selecting_type;
> >
> >     static selecting_type   hack;
> >
> > // IContainer methods
> > public:
> >     /// Denotes whether the given container is empty
> >     bool        isEmpty();
> >     /// Returns an enumerator object representing the elements of the
> > container
> >     IEnumerator enumerate();
> > }
> >
> >
> >
>
>