Actually, it should be written more like this: template<typename T> std::pair<T, std::vector<std::string_view>> tokenize_string(T &&str); So then

Actually, it should be written more like this: template<typename T> std::pair<T, std::vector<std::string_view>> tokenize_string(T &&str); So then it uses `std::forward` to conditionally move the string for rvalues, and `T` will be a reference to the original string for lvalues.