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