#include <tuple>
#include <vector>
#include <algorithm>
#include <iostream>
 
template <typename Tuple, typename T>
Tuple handle(Tuple t, T v)
{
    std::get<0>(t) += v;
    std::get<1>(t) *= v;
    return t;
}
 
int main()
{
    std::vector<int> a = { 1,2,3,4,5,6,7 };
 
    for (auto i=1ul << 12; i;)
    {
        auto accum = std::make_tuple(0,1);
        accum = std::accumulate(a.begin(), a.end(), accum, handle<decltype(accum), int>);
 
        if (!--i)
            std::cout << "sum: " << std::get<0>(accum) << ", product: " << std::get<1>(accum) << std::endl;
    }
 
    return 0;
}
 

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