The following code example is taken from the book
C++ Templates - The Complete Guide
by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002
© Copyright David Vandevoorde and Nicolai M. Josuttis 2002
template<typename T>
class CompoundT { // primary template
public:
enum { IsPtrT = 0, IsRefT = 0, IsArrayT = 0,
IsFuncT = 0, IsPtrMemT = 0 };
typedef T BaseT;
typedef T BottomT;
typedef CompoundT<void> ClassT;
};