std::nullopt
From cppreference.com
| Defined in header <optional>
|
||
| constexpr nullopt_t nullopt{/*unspecified*/}; |
(since C++14) | |
std::nullopt is a constant of type std::nullopt_t that is used to indicate optional type with uninitialized state.
[edit] See also
| (C++14) |
indicator of optional type with uninitialized state (class) |