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... Elements, template<typename T> class MetaFun>
class TransformT<Typelist<Elements...>, MetaFun, false>
{
public:
using Type = Typelist<typename MetaFun<Elements>::Type...>;
};