Re: very intersting:derived class private member accessed???

From:

"werasm" <w_erasm@telkomsa.net>

Newsgroups:

comp.lang.c++

Date:

23 Jun 2006 08:40:14 -0700

Message-ID:

<1151077214.472542.266720@u72g2000cwu.googlegroups.com>

Bangalore wrote:

Hi,

In the following program, eventhogh two member function declared under
private section of the derived class are accessable by derived class
pointer.

They are accessed via the base-class pointer. They are public in the
base class, therefore when using the base as interface (or accessing
them via base pointer), they should be public. Accessing them through
the derived pointer, this would not work.

class Base
{
  public:
    virtual void v1() = 0;
};
class Derived
{
  public:
  // ...constructor etc.
  private:
     //Note: v1 not private when accessed through baseclass reference
or pointer!
    virtual void v1()
    {
      //...some code
    };
}

Base* bp( new Derived() );
Derived* dp( new Derived() );

bp->v1(); //Ok, as public when accessed through base ptr
dp->v1(); //Error - private!

Please clarify me how can derived class pointer acess private member
functions.

You weren't using the derived pointer in your example, you were using
the base

private member functions
#include <stdio.h>

Use #include <cstdio> over here...

Kind regards,

Werner