#include <iostream>

using std::cout;

// To compile it with "override" keywords present, you
// will need a compiler that supports C++11. g++ supports
// "override" starting from version 4.7.

class Shape {
public:
	virtual void draw() { cout << "Shape::draw()\n"; }
};

class Triangle : public Shape {
public:
	void draw() /*override*/ { cout << "Triangle::draw()\n"; }
};

class Circle : public Shape {
public:
	void draw() /*override*/ { cout << "Circle::draw()\n"; }
};

int main() {
	Triangle triangle;
	Circle circle;

	Shape shape1(triangle);
	shape1.draw();
	cout << "-------------------------------\n\n";

	Shape &shape2 = circle;
	shape2.draw();
	cout << "-------------------------------\n\n";

	Shape *pshape3 = &triangle;
	pshape3->draw();
	cout << "-------------------------------\n\n";

	return 0;
}