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      std::experimental::nullopt

      From cppreference.com
      <cpp‎ |experimental‎ |optional
       
       
       
       
       
      Defined in header<experimental/optional>
      constexpr nullopt_t nullopt{/*unspecified*/};
      (library fundamentals TS)

      std::experimental::nullopt is a constant of typestd::experimental::nullopt_t that is used to indicateoptional type with uninitialized state.

      [edit]See also

      (library fundamentals TS)
      indicator of optional type with uninitialized state
      (class)[edit]
      Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/experimental/optional/nullopt&oldid=75965"

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