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std::unexpect_t, std::unexpect

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Utilities library
General utilities
Relational operators (deprecated in C++20)
 
 
Defined in header <expected>
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.

Notes

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

See also

constructs the expected object
(public member function) [edit]
in-place construction tag
(tag)[edit]