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
// primary template: in general T is no fundamental type
template <typename T>
class IsFundaT {
public:
enum { Yes = 0, No = 1};
};
// macro to specialize for fundamental types
#define MK_FUNDA_TYPE(T) \
template<> class IsFundaT<T> { \
public: \
enum { Yes = 1, No = 0 }; \
};
MK_FUNDA_TYPE(void)
MK_FUNDA_TYPE(bool)
MK_FUNDA_TYPE(char)
MK_FUNDA_TYPE(signed char)
MK_FUNDA_TYPE(unsigned char)
MK_FUNDA_TYPE(wchar_t)
MK_FUNDA_TYPE(signed short)
MK_FUNDA_TYPE(unsigned short)
MK_FUNDA_TYPE(signed int)
MK_FUNDA_TYPE(unsigned int)
MK_FUNDA_TYPE(signed long)
MK_FUNDA_TYPE(unsigned long)
#if LONGLONG_EXISTS
MK_FUNDA_TYPE(signed long long)
MK_FUNDA_TYPE(unsigned long long)
#endif // LONGLONG_EXISTS
MK_FUNDA_TYPE(float)
MK_FUNDA_TYPE(double)
MK_FUNDA_TYPE(long double)
#undef MK_FUNDA_TYPE