cpp pass function as argument

//model/*.cpp
void util::invoke_pass_func(const int& x,const int& y)
{
    std::cout<<"x="<<x<<",y="<<y<<std::endl;
    int sum=pass_func(x,y,&add);
    std::cout<<"The add of "<<x<<" and "<<y<<" is "<<sum<<std::endl;
    int multiply=pass_func(x,y,&prod);
    std::cout<<"The prod of "<<x<<" and "<<y<<" is "<<multiply<<std::endl;
    print_log("in "+std::string(__FUNCTION__));
}

int util::pass_func(const int& x,const int& y,int(*func)(const int&,const int&))
{
    return func(x,y);
}

int util::add(const int& x, const int& y)
{
    return x+y;
}

int util::prod(const int& x, const int& y)
{
    return  x*y;
}

//main.cpp
void pass_func_demo(int x,int y)
{
    util ul;
    ul.invoke_pass_func(x,y);
}

int main(int args, char **argv)
{
   std::thread t1(pass_func_demo,atoi(argv[1]),atoi(argv[2]));
   t1.join();
}

g++ -g -std=c++2a -I. *.cpp ./model/*.cpp -o h1 -luuid -lpthread

./h1 100000 10000