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std::unexpect_t, std::unexpect

Defined in header <expected> 
struct unexpect_t {
    explicit unexpect_t() = default;
};
 (1) (since C++23) 
inline constexpr unexpect_t unexpect{};
 (2) (since C++23)
1) A tag type for in-place construction of an unexpected value in an std::expected object.
2) A constant of type const std::unexpect_t which is usually directly passed to a constructor of std::expected to construct an unexpected value.

Notes

Like other construction tag types, unexpect_t is a trivial, empty class with an explicit default constructor.

See also

(C++23)
 constructs the expected object
(public member function)

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https://en.cppreference.com/w/cpp/utility/expected/unexpect_t