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std::nullopt_t

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std::optional
 
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struct nullopt_t;
 ( C++17)

std::nullopt_t , optional . , std::optional nullopt_t , , .

std::nullopt_t LiteralType .

constexpr, , .

nullopt_t op = {};, op = nullopt; optional. 

struct nullopt_t {
    constexpr explicit nullopt_t(int) {}
};

(C++17)
 nullopt_t
() []
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