Lines Matching refs:nullopt_t

23   struct nullopt_t{see below };
24   inline constexpr nullopt_t nullopt(unspecified );
44   template <class T> constexpr bool operator==(const optional<T>&, nullopt_t) noexcept;
45   template <class T> constexpr bool operator==(nullopt_t, const optional<T>&) noexcept;
46   template <class T> constexpr bool operator!=(const optional<T>&, nullopt_t) noexcept;
47   template <class T> constexpr bool operator!=(nullopt_t, const optional<T>&) noexcept;
48   template <class T> constexpr bool operator<(const optional<T>&, nullopt_t) noexcept;
49   template <class T> constexpr bool operator<(nullopt_t, const optional<T>&) noexcept;
50   template <class T> constexpr bool operator<=(const optional<T>&, nullopt_t) noexcept;
51   template <class T> constexpr bool operator<=(nullopt_t, const optional<T>&) noexcept;
52   template <class T> constexpr bool operator>(const optional<T>&, nullopt_t) noexcept;
53   template <class T> constexpr bool operator>(nullopt_t, const optional<T>&) noexcept;
54   template <class T> constexpr bool operator>=(const optional<T>&, nullopt_t) noexcept;
55   template <class T> constexpr bool operator>=(nullopt_t, const optional<T>&) noexcept;
89     constexpr optional(nullopt_t) noexcept;
106     optional &operator=(nullopt_t) noexcept;                     // constexpr in C++20
231 struct nullopt_t
234     _LIBCPP_INLINE_VISIBILITY constexpr explicit nullopt_t(__secret_tag, __secret_tag) noexcept {}
237 inline constexpr nullopt_t nullopt{nullopt_t::__secret_tag{}, nullopt_t::__secret_tag{}};
657     static_assert(!is_same_v<__uncvref_t<value_type>, nullopt_t>,
658         "instantiation of optional with nullopt_t is ill-formed");
751     _LIBCPP_INLINE_VISIBILITY constexpr optional(nullopt_t) noexcept {}
830     _LIBCPP_CONSTEXPR_AFTER_CXX17 optional& operator=(nullopt_t) noexcept
1115     static_assert(!is_same_v<_Up, nullopt_t>,
1116                   "Result of f(value()) should not be std::nullopt_t");
1130     static_assert(!is_same_v<_Up, nullopt_t>,
1131                   "Result of f(value()) should not be std::nullopt_t");
1145     static_assert(!is_same_v<_Up, nullopt_t>,
1146                   "Result of f(std::move(value())) should not be std::nullopt_t");
1160     static_assert(!is_same_v<_Up, nullopt_t>,
1161                   "Result of f(std::move(value())) should not be std::nullopt_t");
1298 operator==(const optional<_Tp>& __x, nullopt_t) noexcept
1306 operator==(nullopt_t, const optional<_Tp>& __x) noexcept
1314 operator!=(const optional<_Tp>& __x, nullopt_t) noexcept
1322 operator!=(nullopt_t, const optional<_Tp>& __x) noexcept
1330 operator<(const optional<_Tp>&, nullopt_t) noexcept
1338 operator<(nullopt_t, const optional<_Tp>& __x) noexcept
1346 operator<=(const optional<_Tp>& __x, nullopt_t) noexcept
1354 operator<=(nullopt_t, const optional<_Tp>&) noexcept
1362 operator>(const optional<_Tp>& __x, nullopt_t) noexcept
1370 operator>(nullopt_t, const optional<_Tp>&) noexcept
1378 operator>=(const optional<_Tp>&, nullopt_t) noexcept
1386 operator>=(nullopt_t, const optional<_Tp>& __x) noexcept