This function I don't understand: https://en.cppreference.com/w/cpp/utility/forward https://en.cppreference.com/w/cpp/utility/forward It has something to do w

This function I don't understand: https://en.cppreference.com/w/cpp/utility/forward https://en.cppreference.com/w/cpp/utility/forward It has something to do with references and lvalues.