template <typename T, int int_param> struct dispatch_demo {
    void do_the_job_impl(int_v<0>)
    {
        std::cout << "zero" << std::endl;
    }

    void do_the_job_impl(int_v<1>)
    {
        std::cout << "one" << std::endl;
    }

    template <int v> void do_the_job_impl(int_v<v>)
    {
        std::cout << "generic" << std::endl;
    }

    void do_the_job()
    {
        do_the_job_impl(int_v<int_param>());
    }
};