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<>
class TypeOp <void> { // full specialization for void
public:
typedef void ArgT;
typedef void BareT;
typedef void const ConstT;
typedef void RefT;
typedef void RefBareT;
typedef void RefConstT;
};