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
#ifndef SUMPOLICY_HPP
#define SUMPOLICY_HPP
template<typename T1, typename T2>
class SumPolicy {
public:
static void accumulate (T1& total, T2 const& value) {
total += value;
}
};
#endif // SUMPOLICY_HPP