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 ACCUM_HPP
#define ACCUM_HPP
#include "accumtraits4.hpp"
#include "sumpolicy2.hpp"
template<typename T,
template<typename,typename> class Policy = SumPolicy,
typename Traits = AccumulationTraits<T>>
auto accum (T const* beg, T const* end)
{
using AccT = typename Traits::AccT;
AccT total = Traits::zero();
while (beg != end) {
Policy<AccT,T>::accumulate(total, *beg);
++beg;
}
return total;
}
#endif // ACCUM_HPP