Could you describe the different types of polymorphism used in object-oriented programming?

In object-oriented programming (OOP), polymorphism allows objects of different classes to be processed through a single interface. The main types of polymorphism:

1. Compile-time (static) polymorphism — determined during compilation.

   • Function overloading: multiple functions with the same name but different parameters.
   • Operator overloading: defining the behavior of operators for user-defined types.

2. Runtime (dynamic) polymorphism — determined during execution.

   • Virtual functions in C++: the base class declares a function as virtual, and derived classes override it. Calling the function through a pointer or reference to the base class invokes the derived class's version.

Example of dynamic polymorphism in C++:

#include <iostream>

class Animal {
public:
    virtual void sound() { std::cout << "Some sound" << std::endl; }
};

class Dog : public Animal {
public:
    void sound() override { std::cout << "Bark" << std::endl; }
};

void makeSound(Animal& a) {
    a.sound();
}

int main() {
    Dog d;
    makeSound(d); // Outputs "Bark"
    return 0;
}

Thus, polymorphism allows writing more flexible and extensible code.