使用 C++ 实现复杂枚举

class URMoveState {
public:
  enum StateEnum {
    MOVEC = 0,
    MOVEJ = 1,
    MOVEL = 2,
    MOVEP = 3
  };
  StateEnum _state;

  explicit URMoveState(const StateEnum &state) : _state(state) {};

  // 重载等于
  inline bool operator==(const URMoveState &rhs) {
    return _state == rhs._state;
  }
  inline bool operator==(const StateEnum &rhs) {
    return _state == rhs;
  }

  // 重载不等于
  inline bool operator!=(const URMoveState &rhs) {
    return _state != rhs._state;
  }
  inline bool operator!=(const StateEnum &rhs) {
    return _state != rhs;
  }

  std::string name() {
    switch (_state) {
    case MOVEC:return "movec";
    case MOVEJ:return "movej";
    case MOVEL:return "movel";
    case MOVEP:return "movep";
    }
  }
  // and so on ...
};