template <int val> struct int_v{
    enum {
        value = val
    };
};

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>());
    }
};

int main() {
    dispatch_demo<int, 0> d0;
    dispatch_demo<int, 1> d1;
    dispatch_demo<int, 2> d2;

    d0.do_the_job();
    d1.do_the_job();
    d2.do_the_job();

    return 0;
}