• Charlie <Charlie_member pathlink.com> Jul 29 2004
• Derek Parnell <derek psych.ward> Jul 29 2004
• parabolis <parabolis softhome.net> Jul 29 2004

Charlie <Charlie_member pathlink.com> writes:

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

Derek Parnell <derek psych.ward> writes:

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

parabolis <parabolis softhome.net> writes:

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();
     }