#include <iostream>
#include <vector>

class FunkyVector {
  std::vector<int> _v;

public:
  FunkyVector(size_t n) : _v(n) {}
  size_t size() const { return _v.size(); }
  int &operator[](int i) {
    if (i >= 0)
      return _v[i];
    else
      return _v[_v.size() + i];
  }
};

int main(int, char *[]) {
  FunkyVector v(10);
  for (size_t i = 0; i < v.size(); ++i) {
    v[i] = i;
  }
  // 0 1 2 3 4 5 6 7 8 9
  for (int i = -5; i < 5; ++i) {
    std::cout << "v[" << i << "] = " << v[i] << std::endl;
  }
}