In CPP How are function and operator overloading part of polymorphism...?

Question

Having a virtual method in the base class will aid the derived classes to have polymorphic abilities..But how are function overloading and operator overloading a part of polymorphism?
Textbook definitions of polymorphism is
That a call to a member function will cause a different function to be executed depending on the type of object that invokes the function.
If the base class have non virtual overloaded functions and derived classes have it too how can it be polymorphic ?

Answer 1

if you call that function on object of base class it will be executed that method in base class, if you call on object of derived class function in that class will be executed, different objects execute same function in different ways and that is polymorphism