for_each_in_tuple

namespace detail {
    template<class F, class... Ts, std::size_t... Is>
    void for_each_in_tuple(const std::tuple<Ts...> & tuple, F func, std::index_sequence<Is...>){
        using expander = int[];
        (void)expander { 0, ((void)func(std::get<Is>(tuple)), 0)... };
    }
}

template<class F, class...Ts>
void for_each_in_tuple(const std::tuple<Ts...> & tuple, F func){
    detail::for_each_in_tuple(tuple, func, std::make_index_sequence<sizeof...(Ts)>());
}