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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
       indicate	optional
	  type with uninitialized state.

See also
	  nullopt_t indicator of optional type with uninitialized state
	  (C++17)   (class)

http://cppreference.com		  2022.07.31		       std::nullopt(3)

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