Checkpoint iterator ideal API - not yet working...

checkpoint_iterator2.cpp

#include <iostream>
#include <list>
#include <vector>

using Container = std::list<int>;

void print(const Container& v) {
  std::cout << "[";
  for (auto& e : v) {
    std::cout << e << " ";
  }
  std::cout << "]\n";
}

#if 0
class magic_iterator {
public:
    auto operator++() {
        --reverse_iterator;
    }
  
    bool operator==(magic_iterator) {
    }
  
private:
    Container::reverse_iterator rit;
};
#endif

auto make_cursor(Container& v) {
    // XXX do somthing with a new iterator
    return v.begin();
}

auto checkpoint_end(Container& v) {
    return v.end();
}

int main() {
  Container v;
  // Initially populate with 2 elements
  v.push_back(1);
  v.push_back(2);
  v.push_back(3);
  print(v);

  // get a "checkpoint" / "off_by_one" iterator
  auto cursor = make_cursor(v);

  for (; cursor != checkpoint_end(v); cursor++) {
      // consume cursor...
      std::cout << *cursor << " ";
  }

  v.push_back(4);
  v.push_back(5);

  for (; cursor != checkpoint_end(v); cursor++) {
      // consume cursor...
      std::cout << *cursor;
  }
  std::cout << "\n";
}