Method sum

source/core/StarVector.hpp:426–431

template <typename T, size_t N>
T Vector<T, N>::sum() const {
  T s = (*this)[0];
  for (size_t i = 1; i < N; ++i)
    s += (*this)[i];
  return s;
}

template <typename T, size_t N>
T Vector<T, N>::product() const {