struct unexpect_t { explicit unexpect_t() = default; };
(1) (since C++23)inline constexpr std::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.
Like other construction tag types, unexpect_t
is a trivial, empty class with an explicit default constructor.
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