22 General utilities library [utilities]

22.5 Optional objects [optional]

22.5.8 Comparison with nullopt [optional.nullops]

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template<class T> constexpr bool operator=(const optional<T>& x, nullopt_t) noexcept;
1
#
Returns: !x.
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template<class T> constexpr strong_ordering operator<=>(const optional<T>& x, nullopt_t) noexcept;
2
#
Returns: x.has_value() <=> false.

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