namespace std {
class weak_ordering {
int value;
constexpr explicit weak_ordering(ord v) noexcept : value(int(v)) {}
public:
static const weak_ordering less;
static const weak_ordering equivalent;
static const weak_ordering greater;
constexpr operator partial_ordering() const noexcept;
friend constexpr bool operator==(weak_ordering v, unspecified) noexcept;
friend constexpr bool operator==(weak_ordering v, weak_ordering w) noexcept = default;
friend constexpr bool operator< (weak_ordering v, unspecified) noexcept;
friend constexpr bool operator> (weak_ordering v, unspecified) noexcept;
friend constexpr bool operator<=(weak_ordering v, unspecified) noexcept;
friend constexpr bool operator>=(weak_ordering v, unspecified) noexcept;
friend constexpr bool operator< (unspecified, weak_ordering v) noexcept;
friend constexpr bool operator> (unspecified, weak_ordering v) noexcept;
friend constexpr bool operator<=(unspecified, weak_ordering v) noexcept;
friend constexpr bool operator>=(unspecified, weak_ordering v) noexcept;
friend constexpr weak_ordering operator<=>(weak_ordering v, unspecified) noexcept;
friend constexpr weak_ordering operator<=>(unspecified, weak_ordering v) noexcept;
};
inline constexpr weak_ordering weak_ordering::less(ord::less);
inline constexpr weak_ordering weak_ordering::equivalent(ord::equivalent);
inline constexpr weak_ordering weak_ordering::greater(ord::greater);
}