std::experimental::nullopt
< cpp | experimental | optional
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Defined in header
<experimental/optional> |
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constexpr nullopt_t nullopt{/*unspecified*/};
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(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
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(library fundamentals TS)
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indicator of optional type with uninitialized state (class) |