convert vector

How to convert vector<unique_ptr<T>> to vector<unique_ptr<const T>>?

Any downside of using reinterpret_cast? What's recommended way to do so in C++11 and forward?

vector<unique_ptr<const T>> Get() {
  vector<unique_ptr<T>> some;
  ...
  // Any better way to do this?
  return *(reinterpret_cast<vector<unique_ptr<const T>>*>(&some));
}