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

class my_iterator : public std::iterator<std::bidirectional_iterator_tag, int> {
  int d_val = 12;
public:
  my_iterator  operator--(int) { std::cout << "decrement--\n"; return my_iterator(); }
  my_iterator &operator--()    { std::cout << "--decrement\n"; return *this; }
  my_iterator  operator++(int) { std::cout << "increment++\n"; return my_iterator(); }
  my_iterator &operator++()    { std::cout << "++increment\n"; return *this; }
  
  int &operator*() { std::cout << "*dereference\n"; return d_val; }
  
  bool operator==(my_iterator const  &o) { return false; }
  bool operator!=(my_iterator const  &o) { return true ; }
};


int main() {
  auto it = std::reverse_iterator<my_iterator>();
  int &i = *it;
  if (true)
  {
    std::cout << i << '\n';
  }
  else
  {
    std::vector<int> vec;
    vec.push_back(i);
    std::cout << vec[0] << '\n';
  }
}