std::nullopt
From cppreference.com
Defined in header
<optional>
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constexpr nullopt_t nullopt{/*unspecified*/};
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(since C++17) | |
std::nullopt
is a constant of type std::nullopt_t that is used to indicate optional
type with uninitialized state.
[edit] See also
(C++17)
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indicator of optional type with uninitialized state (class) |