learning about rrefs in c++11

a.cpp

#include <utility>
#include <stdio.h>
#include <vector>

class Foo {
    private:
        std::vector<int> i;
    public:
        Foo(std::vector<int> paramI) {
            i = paramI;
        }

        Foo(Foo&& foo) {
            i = std::move(foo.i);
            foo.i.push_back(15);
            foo.i.push_back(26);
        }

        int getI() {
            return i.size();
        }
};

void bar(Foo foo) {
    printf("foo.i (inside bar) is %d\n", foo.getI());
}

//should print out 1 and 2
int main(int argc, char **argv) {
    std::vector<int> my_list = std::vector<int>();
    my_list.push_back(12);
    Foo foo(my_list);
    my_list.clear();
    bar(std::move(foo));
    printf("foo.i is %d\n", foo.getI());
    return 0;
}