template <class T> constexpr bool operator==(const optional<T>& x, nullopt_t) noexcept; template <class T> constexpr bool operator==(nullopt_t, const optional<T>& x) noexcept;
template <class T> constexpr bool operator!=(const optional<T>& x, nullopt_t) noexcept; template <class T> constexpr bool operator!=(nullopt_t, const optional<T>& x) noexcept;
template <class T> constexpr bool operator<(const optional<T>& x, nullopt_t) noexcept;
template <class T> constexpr bool operator<(nullopt_t, const optional<T>& x) noexcept;
template <class T> constexpr bool operator<=(const optional<T>& x, nullopt_t) noexcept;
template <class T> constexpr bool operator<=(nullopt_t, const optional<T>& x) noexcept;
template <class T> constexpr bool operator>(const optional<T>& x, nullopt_t) noexcept;
template <class T> constexpr bool operator>(nullopt_t, const optional<T>& x) noexcept;
template <class T> constexpr bool operator>=(const optional<T>& x, nullopt_t) noexcept;
template <class T> constexpr bool operator>=(nullopt_t, const optional<T>& x) noexcept;
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