for(dbl_vec_t::iterator itr = v1.begin(); itr != v1.end(); ++itr)
    *itr *= 2;

  for (int i = 0; i < v1.size(); i++)
    v1[i] += 3;

  v1.swap(v2); // Swap the vector's contents.
  v2 = v1; // Assign one vector to another.
  assert(v1 == v2);
  std::reverse(v1.begin(), v1.end());
  
  // More standard features follow ...

  for(dbl_vec_t::reverse_iterator ritr = v1.begin(); ritr != v1.rend(); ++ritr)
    *ritr /= 2;

  v1.pop_back();
  v1.insert(v1.begin(), 34);
  assert(v1.front() == 34);
  v2.assign(v1.begin(), v1.end());

  return 0;
}