The following code example is taken from the book
C++ Templates - The Complete Guide, 2nd Edition
by David Vandevoorde, Nicolai M. Josuttis, and Douglas Gregor,
Addison-Wesley, 2017
© Copyright David Vandevoorde, Nicolai M. Josuttis, Douglas Gregor 2017
template<typename List, typename NewElement>
class PushBackT;
template<typename... Elements, typename NewElement>
class PushBackT<Typelist<Elements...>, NewElement>
{
public:
using Type = Typelist<Elements..., NewElement>;
};
template<typename List, typename NewElement>
using PushBack = typename PushBackT<List, NewElement>::Type;