accum7.hpp

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