#include <string>
#include <iostream>
using namespace std;

class Thing {
        static int count;

public:
        Thing(Thing const & t) { /* No count incr on copy constructor */ }
        Thing(int i = 0) { ++count; }
        void print() { cout << count << endl; }
};

int Thing::count = 0;

void foo(Thing t = 2) {
        t.print();
}

int main() {
        Thing a(6);
        foo();  // 2
        foo();  // 3
        foo(a); // 3
        foo(3); // 4
        foo(a); // 4
        foo();  // 5

        return 0;
}