c++ opp , virtual keyword

virtual.cpp

// virtual is all about binding , early binding in compliation so it will determine abject and so method to call
// as reference is or late binding shen method is virtual so binding determine in run time dynamically
// according to actual type of object and sall it's method
// depend on http://stackoverflow.com/questions/2391679/why-do-we-need-virtual-methods-in-c

#include <iostream>

using namespace std;
class Animal
{
public:
	void eat() { cout << "I'm eating generic food.\n"; }
	virtual void like() { cout << "I'm like generic food.\n"; }
};

class Cat : public Animal
{
public:
	void eat() { cout << "I'm eating a rat.\n"; }
	void like() { cout << "I'm like eating rats.\n"; }
};

void func(Animal *xyz) { xyz->eat(); xyz->like(); }


int main(){
	Animal *animal = new Animal;
	Cat *cat = new Cat;

	animal->eat(); // outputs: "I'm eating generic food."
	cat->eat();    // outputs: "I'm eating a rat."

	func(animal);
	func(cat);
}