Cool cpp

main.cpp

#include <vector>
#include <numeric>

struct sum_f
{
    template<class T, class U>
    auto operator()(T x, U y) const
    {
        auto p = x * y;
        return x + y + p;
    }
};
constexpr auto sum = sum_f();

int main()
{
    std::vector<int> v = { 1, 2, 3 };
    int total = std::accumulate(v.begin(), v.end(), 0, sum);
    std::vector<float> w = { 1, 2, 3 };
    int ftotal = std::accumulate(w.begin(), w.end(), 0, sum);
    std::vector<char> x = { 1, 2, 3 };
    int xtotal = std::accumulate(x.begin(), x.end(), 0, sum);
    return total + ftotal + xtotal;
}