accum2.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 "accumtraits2.hpp"

template<typename T>
auto accum (T const* beg, T const* end)
{
    // return type is traits of the element type
    using AccT = typename AccumulationTraits<T>::AccT;

    AccT total{};  // assume this actually creates a zero value
    while (beg != end) {
        total += *beg;
        ++beg;
    }
    return total;
}

#endif // ACCUM_HPP