template<class T, class Container>
  bool operator==(const queue<T, Container>& x, const queue<T, Container>& y);
template<class T, class Container>
  bool operator!=(const queue<T, Container>& x,  const queue<T, Container>& y);
template<class T, class Container>
  bool operator< (const queue<T, Container>& x, const queue<T, Container>& y);
template<class T, class Container>
  bool operator> (const queue<T, Container>& x, const queue<T, Container>& y);
template<class T, class Container>
  bool operator<=(const queue<T, Container>& x, const queue<T, Container>& y);
template<class T, class Container>
    bool operator>=(const queue<T, Container>& x,
                    const queue<T, Container>& y);
template<class T, three_way_comparable Container>
  compare_three_way_result_t<Container>
    operator<=>(const queue<T, Container>& x, const queue<T, Container>& y);