#ifndef UNIQUE_FD_HH
#define UNIQUE_FD_HH

class unique_fd {
 public:
  constexpr unique_fd() : fd_(-1) {}
  explicit constexpr unique_fd(int fd) : fd_(fd) {}
  unique_fd(unique_fd& fd) = delete;
  unique_fd& operator=(unique_fd& fd) = delete;
  unique_fd(unique_fd&& fd) : fd_(fd.release()) {}
  unique_fd& operator=(unique_fd&& fd) {
    reset(fd.release());
    return *this;
  }
  ~unique_fd() { reset(); }

  bool operator==(unique_fd const& fd) const { return get() == fd.get(); }
  bool operator!=(unique_fd const& fd) const { return get() != fd.get(); }

  int get() const { return fd_; }
  explicit operator bool() const { return fd_ != -1; }
  int operator*() const { return fd_; }

  int release() {
    int ret = fd_;
    fd_ = -1;
    return ret;
  }

  void reset(int fd = -1);

 private:
  int fd_;
};

#endif  // UNIQUE_FD_HH