insert_empty_range.cpp

#include <iostream>
#include <iterator>
#include <vector>

int main()
{
  std::vector<int> vec;
  vec.push_back(1);
  vec.push_back(2);
  vec.push_back(3);
  vec.push_back(4);
  
  std::vector<int> empty;
  vec.insert(vec.begin(), empty.begin(), empty.end());
  
  std::copy(vec.begin(), vec.end(), std::ostream_iterator<int>(std::cout, " "));
  std::cout << std::endl;
  return 0;
}