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, bool Empty = IsEmpty<List>::value>
class ReverseT;
template<typename List>
using Reverse = typename ReverseT<List>::Type;
// recursive case:
template<typename List>
class ReverseT<List, false>
: public PushBackT<Reverse<PopFront<List>>, Front<List>> { };
// basis case:
template<typename List>
class ReverseT<List, true>
{
public:
using Type = List;
};