accumtraits2.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


template<typename T>
struct AccumulationTraits;

template<>
struct AccumulationTraits<char> {
    using AccT = int;
};

template<>
struct AccumulationTraits<short> {
    using AccT = int;
};

template<>
struct AccumulationTraits<int> {
    using AccT = long;
};

template<>
struct AccumulationTraits<unsigned int> {
    using AccT = unsigned long;
};

template<>
struct AccumulationTraits<float> {
    using AccT = double;
};