In polymorphism, the address of the virtual function table is shared by all objects.

 

Class parent {
Public:
Virtual test (){
Cout <"from parent" <endl;
};
};

Class son1: public parent {
Public:
Virtual test (){
Cout <"from son1" <endl;
};
};

Class son2: public parent {
Public:
Virtual test (){
Cout <"from son2" <endl;
};
};

Void main (){
Son1 s1;
Son2 s2;
Parent & p = s1;
P. test ();
P = s2; // (1) No change
P. test ();

Int j = 1, k = 2;
Int & I = j;
Cout <I <endl;
I = k; // (2) but changed
Cout <I <endl;
}

Output result:
From son1
From son1
1
2

 

If we understand that in polymorphism, the address of the virtual function table is shared by all objects.

This result is not confusing.