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
void copycountertest()
{
Tuple<CopyCounter<0>, CopyCounter<1>, CopyCounter<2>,
CopyCounter<3>, CopyCounter<4>> copies;
auto reversed = reverse(copies);
std::cout << "0: " << CopyCounter<0>::numCopies << " copies\n";
std::cout << "1: " << CopyCounter<1>::numCopies << " copies\n";
std::cout << "2: " << CopyCounter<2>::numCopies << " copies\n";
std::cout << "3: " << CopyCounter<3>::numCopies << " copies\n";
std::cout << "4: " << CopyCounter<4>::numCopies << " copies\n";
}