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1 Parametershttps://en.cppreference.com/cpp/experimental/optional/optional#Parameters
2 Exceptionshttps://en.cppreference.com/cpp/experimental/optional/optional#Exceptions
3 Examplehttps://en.cppreference.com/cpp/experimental/optional/optional#Example
4 See alsohttps://en.cppreference.com/cpp/experimental/optional/optional#See_also
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