C++ Language/Type/Variant/TemplatedVariant

A variable xVar whose type is std::variant<int,float,std::string> can store a value that is either int or float or std::string (only one of those options at a time). Thus, this templated-variant variable is a modern alternative to a C union. After assigning xVar = 9.9F;, you know that the variable is currently storing a float because std::holds_alternative<float>(xVar) returns true and xVar.index() returns 1 (0-based indexing of type options). Access that value by either std::get<float>(xVar) or by std::get<1>(xVar). Additional information about templated-variant (includes interactive examples)