std::nullopt(3) C++ Standard Libary std::nullopt(3) NAME std::nullopt - std::nullopt Synopsis Defined in header <optional> inline constexpr nullopt_t nullopt{/*unspecified*/}; (since C++17) std::nullopt is a constant of type std::nullopt_t that is used to indi- cate optional type with uninitialized state. See also nullopt_t indicator of optional type with uninitialized state (C++17) (class) http://cppreference.com 2024.06.10 std::nullopt(3)
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