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>
class FrontT;
template<typename Head, typename... Tail>
class FrontT<Typelist<Head, Tail...>>
{
public:
using Type = Head;
};
template<typename List>
using Front = typename FrontT<List>::Type;