std::experimental::nullopt
From cppreference.com
< cpp | experimental | optional
| Defined in header <experimental/optional>
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| constexpr nullopt_t nullopt{/*unspecified*/}; |
(library fundamentals TS) | |
std::experimental::nullopt is a constant of type std::experimental::nullopt_t that is used to indicate optional type with uninitialized state.
See also
| (library fundamentals TS) |
indicator of optional type with uninitialized state (class) |