std::unexpect_t, std::unexpect - cppreference.com
From cppreference.com
| Defined in header |
||
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.