#include <iostream>
#include <cstdlib>
#include "father.h"
#include "derived.h"
using namespace std;

int main()
{
	father fath(10);
	const father::layout& flay =
		reinterpret_cast<const father::layout &>(fath);

	cout << "father at address " << &fath << " has an f whose address is "<<
		reinterpret_cast<const void *>(reinterpret_cast<size_t>(
		flay.ptr_to_vtbl->ptr_to_f)) << ".\n"
		"Let's call this function twice, passing it " << &fath << ".\n";
	fath.f();
	flay.ptr_to_vtbl->ptr_to_f(&fath);  //low-level way to do the same thing
	cout << "\n";

	derived d(20, 30, 40);
	const derived::layout& dlay =
		reinterpret_cast<const derived::layout &>(d);

	cout << "derived at address " << &d << " has an f whose address is " <<
		reinterpret_cast<const void *>(reinterpret_cast<size_t>(
		dlay.ptr_to_vtbl->ptr_to_f)) << ".\n"
		"Let's call this function twice, passing it " << &d << ".\n";
	d.f();
	dlay.ptr_to_fvtbl->ptr_to_f(&d);   //low-level way to do the same thing
	cout << "\n";

	const father *const p = &d;
	const father::layout& flay2 =
		reinterpret_cast<const father::layout &>(*p);

	cout << "father at address " << p << " has an f whose address is " <<
		reinterpret_cast<const void *>(reinterpret_cast<size_t>(
		flay2.ptr_to_vtbl->ptr_to_f)) << ".\n"
		"Let's call this function twice, passing it " << p << ".\n";
	p->f();
	flay2.ptr_to_vtbl->ptr_to_f(p);   //low-level way to do the same thing

	return EXIT_SUCCESS;
}