Example

interface ISubmitter
{
// Socket socket;
// not allowed

bit Login();
bit Submit();
}

class Submitter
{
Socket socket;
abstract bit Login();
abstract bit Submit();

}

This isnt allowed ( Submitter doesn't implement function Login ... ) , how can i
accomplish the same thing ?  ( all classes that derive from submitter have a
Socket member )  Other than making them empty functions or { assert(0); } ?

Thanks,
Charlie

On Thu, 29 Jul 2004 21:36:44 +0000 (UTC), Charlie wrote:

I'm a bit slow, ok. I don't actually understand much of what you are writing about here.

> Example
> 
> interface ISubmitter
> {
> // Socket socket;
> // not allowed

  The above is not allowed because interfaces can only include unadorned
member functions.

> bit Login();
> bit Submit();
> }
> 
> class Submitter
> {
> Socket socket;
> abstract bit Login();
> abstract bit Submit();
> 
> }
> 
> This isnt allowed ( Submitter doesn't implement function Login ... )

What is the 'it' that isn't allowed? Do you mean that the compiler is not allowing it or that you do not want it to be allowed?

> , how can i
> accomplish the same thing ?  ( all classes that derive from submitter have a
> Socket member )  Other than making them empty functions or { assert(0); } ?

'Socket' is not a function. So how would "making them empty functions or {
assert(0); }" help?

Are you wanting Submitter to implement the interface "ISubmitter"?

Anyhow, here is some code that might help...

<code>
    class Socket
    {
        int x;
    }
    interface ISubmitter
    {
     bit Login();
     bit Submit();
    }

    class Submitter : ISubmitter
    {
     Socket socket;
     this() { socket = new Socket; }
     abstract bit Login();
     abstract bit Submit();

    }

    class mySubmitter: Submitter
    {
        bit Login() { return 1;}
        bit Submit() { return 0; }
    }

    void main()
    {
        mySubmitter a = new mySubmitter;

        a.socket.x = 1;
    }
</code>

This compiles and the derived class has a Socket member.
-- 
Derek
Melbourne, Australia
30/Jul/04 10:41:11 AM

Charlie wrote:
> Example
> 
> interface ISubmitter {
> // Socket socket; // not allowed
> 
> bit Login();
> bit Submit();
> }
> 
> class Submitter
> {
> Socket socket;
> abstract bit Login();
> abstract bit Submit();
> 
> }
> 
> This isnt allowed ( Submitter doesn't implement function Login ... ) , how can i
> accomplish the same thing ?  ( all classes that derive from submitter have a
> Socket member )  Other than making them empty functions or { assert(0); } ?
> 
> Thanks,
> Charlie
> 

It sounds like you want an abstract class instead of an Interface for ISubmitter?

    abstract class ACSubmitter
    {
        Socket socket;
        // allowed!

        abstract bit Login();
        abstract bit Submit();
    }

    abstract class Submitter : Submitter
    {
        // Socket socket; <- already have this
        abstract bit Login();
        abstract bit Submit();
    }