#include <assert.h>
#include <type_traits>

template<typename T, typename... Others>
struct splitter{
    using Head = T;
    template <template <typename...> typename U> using Tail = U<Others...>;
};

int main() {
    static_assert( true == std::is_same<int, splitter<int, double, int>::Head>::value );

    using MyType = splitter<int,double,int>;
    using one = MyType::Head;
    using two = MyType::Tail<splitter>::Head;
    using three = MyType::Tail<splitter>::Tail<splitter>::Head;
    //using four = MyType::Tail<splitter>::Tail<splitter>::Tail<splitter>::Head;

    static_assert( true == std::is_same<int, one>::value );
    static_assert( true == std::is_same<double, two>::value );
    static_assert( true == std::is_same<int, three>::value );

    static_assert( true == std::is_same<double, splitter<int,double,int>::Tail<splitter>::Head>::value );
    return 0;
}