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From: Ioannis Vranos <ivr@remove.this.grad.com>
Newsgroups: comp.lang.ada
Subject: Re: Teaching new tricks to an old dog (C++ -->Ada)
Date: Fri, 25 Mar 2005 04:35:33 +0200
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Date: 2005-03-25T04:35:33+02:00
List-Id: <comp.lang.ada>

Martin Krischik wrote:

> It make no difference with interfaces as interfaces hold no data. Tha's the
> Java trick.

Being technically accurate, I have to say it is not a trick. It is a 
subset of the OO paradigm.

ISO C++ provides both the ability to define and inherit both interfaces 
and complete classes.


Here is an interface:

#include <iostream>

class SomeInterface
{
     public:
         virtual void somefunc() =0;

         // Place some definition if you want!
         // Only one method needs to be pure ( =0)
         virtual void func() { /* ... */ }

         virtual ~SomeInterface() {}
};


class SomeClass: public SomeInterface
{
     public:
         void somefunc()
         {
             std::cout<<"SomeClass::somefunc() was called!\n";
         }
};


int main()
{
     // Error: No instances of SomeInterface can be created
     // since it contains pure methods.
    // SomeInterface obj;

    SomeInterface *p= new SomeClass;

    p->somefunc();

    delete p;
}


C:\c>temp
SomeClass::somefunc() was called!

C:\c>



-- 
Ioannis Vranos

http://www23.brinkster.com/noicys