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
// partial specialization for Duo<> with only one field
template <typename A>
struct Duo<A,void> {
public:
typedef A T1; // type of first field
typedef void T2; // type of second field
enum { N = 1 }; // number of fields
private:
T1 value1; // value of first field
public:
// constructors
Duo() : value1() {
}
Duo (T1 const & a)
: value1(a) {
}
// field access
T1& v1() {
return value1;
}
T1 const& v1() const {
return value1;
}
void v2() {
}
void v2() const {
}
//...
};