#include <cstdio>
using namespace std;
 
struct Foo {
    int a;
    Foo(const Foo& foo) : a(foo.a) {
    	printf("Foo(Foo& foo) - %d\n", a);
    }
    Foo(int x) : a(x) {
    	printf("Foo(int) a == %d\n", a);
    }
    ~Foo() {
    	printf("~Foo() a == %d\n", a);
    	a = 0;
    }
};
 
auto& fooRef(const Foo& f) {
    return f;
}
 
int main() {
    const Foo& ref = fooRef(Foo(2));
    printf("ref.a == %d\n", ref.a);
    printf("end of main\n");
    return 0;
}

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