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
template<int N>
struct CopyCounter
{
inline static unsigned numCopies = 0;
CopyCounter() {
}
CopyCounter(CopyCounter const&) {
++numCopies;
}
};