Re: virtual function in inherited class not getting called

From:

alasham.said@gmail.com

Newsgroups:

comp.lang.c++

Date:

Thu, 10 Apr 2008 02:34:41 -0700 (PDT)

Message-ID:

<990555b7-6065-4a7c-83c9-46e70baa958d@d45g2000hsc.googlegroups.com>

On Apr 10, 11:22 am, Angus <anguscom...@gmail.com> wrote:

I have a base class CEventSelect a bit like this:

class CEventSelect
{
virtual void OnConnected();

}

and a network interface class a bit like this:

class networkinterface : public CEventSelect
{
virtual void OnConnected();

}

The base CEventSelect class calls it's OnConnected() function when a
client receives notification from the network that it is connected.
But I wanted my networkinterface::OnConnected() method to be called?
But it wasn't. I understand polymorphic functions and I think I
understand why it is not working the way I wanted. Because
CEventSelect calls its own OnConnected() method does mean that the
inheriting OnConnected() will be called. But this is the behaviour I
want.

The actual connection is notified by the base class - but I want my
interface class to someone get notified of the connection.

How can I get the networkinterface class to be notified about the
connection?

Polymorphic function dispatch mechanism requires the use of pointers
or references. The following should work.
Regards.

#include<iostream>

class CEventSelect
{
public:
    virtual void OnConnected() { std::cout <<
"CEventSelect::OnConnected()\n"; }
};

class networkinterface : public CEventSelect
{
public:
    virtual void OnConnected() { std::cout <<
"networkinterface::OnConnected()\n"; }
};

int main()
{
    CEventSelect* p = new networkinterface();
    p->OnConnected();
    delete p;

    std::cin.get();
}