#include <iostream>
#include <cstdlib>
#include <chrono>     //for chrono::system_clock
#include <random>     //for default_random_engine
#include <functional> //for bind

#include "base.h"     //not necessary; derived.h already includes base.h
#include "derived.h"
using namespace std;

int main()
{
	unsigned seed = chrono::system_clock::now().time_since_epoch().count();
	default_random_engine engine {seed};
	uniform_int_distribution<int> distribution {0, 1};
	auto r {bind(distribution, engine)};

	base *p {nullptr};

	if (r() == 0) {   //unpredictable 50-50 chance: could be 0 or 1
		p = new base {10};
	} else {
		p = new derived {20, 30};
	}	

	cout << "----------------------------------\n";

	delete p;

	return EXIT_SUCCESS;
}