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

// probably not the best way but it works

typedef unsigned int IDType;

class BaseSystem {
public:
	static IDType idCounter;
};

IDType BaseSystem::idCounter;

template <typename Derived>
class System: public BaseSystem {
public:
	static IDType id() {
		static IDType id = idCounter++;
		return id;
	}
};

int main(){
	System<int> s1;
	System<char> s2;
	System<double> s3;
	(void)s1;
	(void)s2;
	(void)s3;

	int i1 = System<char>::id();
	int i2 = System<float>::id();
	int i3 = System<double>::id();

    // prints "test 0 1 2\n"
	printf("test %d %d %d\n", i1, i2, i3);

	system("pause");
	return 0;
}