#include <stdio.h>
#include <stdlib.h>

// Interface
struct Interface {
	int foo;
	void (*bar)();
};

// First class, type one
void one_class_bar () {
	printf("OneClass.Bar()\n");
}

struct OneClass {
	int foo;
	void (*bar)();
};

// Second class, type two
void two_class_bar () {
	printf("TwoClass.Bar()\n");
}

struct TwoClass {
	int foo;
	void (*bar)();
};

// The polymorphism
typedef union {
	struct Interface i;
	struct OneClass o;
	struct TwoClass t;
} Object;

int main () {
	struct OneClass o;
	struct TwoClass t;

	// Binding the functions to the classes
	o.bar = &one_class_bar;
	t.bar = &two_class_bar;

	// Creating a list
	Object list[2];

	// Filling the list
	list[0] = (Object) o;
	list[1] = (Object) t;

	// Running the two methods
	list[0].i.bar(list[0]);
	list[1].i.bar(list[1]);

	return 0;
}