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Applies the visitor vis (a Callable that can be called with any combination of types from the variant) to the variant held by self. Additionally, Functions visit (C++17) calls the provided functor with the arguments held by one or more variant s (function template) [edit] holds_alternative (C++17) checks if a variant …. Furthermore, The visit functions do not modify the basic_format_arg object on which it is called because a copy of the object is used when calling vis. Moreover, Std::get(std::variant) called with an index or type that does not match the currently active alternative. These findings regarding Visit The John F Kennedy Center For The Performing Arts provide comprehensive context for understanding this subject.