Passing vector by reference

Question

Using normal C arrays I\'d do something like that:

void do_something(int el, int **arr)
{
   *arr[0] = el;
   // do something else
}

Now, I

Answer 1

void do_something(int el, std::vector **arr)

should be

void do_something(int el, std::vector& arr)
{
    arr.push_back(el);
}

Pass by reference has been simplified to use the & in C++.