#include <cstdint>
#include <vector>
#include <functional>
  // user class
  class Coor {
      public:
      Coor() = default;
      ~Coor() = default;
      void SetX(const uint16_t in_value) { x = in_value; }
      void SetY(const uint16_t in_value) { y = in_value; }
      uint16_t GetX() { return x; }
      uint16_t GetY() { return y; }
      private:
      uint16_t x{0}, y{0};
  };
int
main(int argc, char* argv[])
{
    static constexpr size_t kSize{10};
    std::vector<Coor> coor(kSize);
    uint8_t  i{0};
    for (auto& c : coor) {
        c.SetX(i * i);
        c.SetY(2 * i);
        ++i;
    }
    std::function<void()> ClearLastElement = [&coor]() mutable {
        auto& last = *coor.rbegin();
        last.SetX(0);
        last.SetY(0);
    };
    ClearLastElement();
}