Perfect forwarding container element

Similar to this question, but instead of perfect forwarding member of an object, I would like to know how to perfect forwarding elements of an STL container, i.e. similar to

struct X {};
void f(X&);
void f(X&&);

template <typename Vector>
void g(Vector&& v, size_t i) {
  if (is_lvalue_reference<Vector>::value) {
    f(v[i]);
  } else {
    f(move(v[i]));
  }
}