tuples c++11

#include <iostream>
#include <tuple>

template<int ...>
struct seq { };
template<int N, int ...S>
struct gens : gens<N-1, N-1, S...> { };
template<int ...S>
struct gens<0, S...> {
  typedef seq<S...> type;
};

template<int ...S, typename ...T>
void PUSH(seq<S...> const &, std::tuple<T...> const & t)
{
    using expander = int[]; expander{(std::cout.operator<<(std::get<S>(t)), 0)...};
    std::cout << std::endl;
}

template<typename ...T1, typename ...T2>
void foo(std::tuple<T1...>const& a, std::tuple<T2...>const& b)
{
    static typename gens<sizeof...(T1)>::type idx1;
    static typename gens<sizeof...(T2)>::type idx2;
    PUSH(idx1, (a));
    PUSH(idx2, (b));
}

int main() {
    auto t = std::make_tuple(1,2,3);
    foo(t, std::make_tuple(1,2,5,6,8));
    return 0;
}