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
#include <iostream>
template<typename... Ts> class Tuple
{
};
template<typename T>
int f(Tuple<T*>)
{
return 1;
}
template<typename... Ts>
int f(Tuple<Ts...>)
{
return 2;
}
template<typename... Ts>
int f(Tuple<Ts*...>)
{
return 3;
}
int main()
{
std::cout << f(Tuple<int, double>()); // calls f<>(Tuple<Ts...>)
std::cout << f(Tuple<int*, double*>()); // calls f<>(Tuple<Ts*...>)
std::cout << f(Tuple<int*>()); // calls f<>(Tuple<T*>)
}