virtual function problem

I have a class X.
Then class Y is inheriting from X.

I have another class Base which is having a virtual function
virtual void fun(X& x){ }
Then i have class Derived which is inheriting form Base which overloads the fun
void fun(Y& y){ }

Now a base calss pointer is created pointing to derived class object.
and i am calling function fun() with that pointer. what i am expected is it will call void fun(Y& y){ } according to virtual mechanism. But it calls void fun(X& x){ }.

since i am using base class pointer (which is pointing to derived class object), to call a virtual function, then derived class' function will be called according to virtual mechanism. Then why this behaviour is happening..

re: virtual function problem

using base class pointer, only base class versions of the functions can be called. Here we are passing Y, which is derived from X. so base class version of fun(0 can take that reference.

re: virtual function problem

For the virtual function mechanism to work you need to override rather than overload.

Your derived class should have void fun(X& x){ } just like the base class.