class Foo {
public:
    int a, b;

    Foo(int a, int b) : a(a), b(b) {

    }
};

int main()
{
    Foo foo(14, 88);

    auto& foo_ref = foo; //lvalue reference
    auto&& foo_ref2 = foo;

    auto foo2 = foo_ref; //copy

    auto foo3 = foo_ref2; //move
    //foo, foo_ref and foo_ref2 are invalid now

    return 0;
}