#include <iostream>
#include <fstream>
 
struct MyStreamingHelper
{
    MyStreamingHelper(std::ostream& out1,
                      std::ostream& out2) : out1_(out1), out2_(out2) {}
    std::ostream& out1_;
    std::ostream& out2_;
};
 
template <typename T>
MyStreamingHelper& operator<<(MyStreamingHelper& h, T const& t)
{
   h.out1_ << t;
   h.out2_ << t;
   return h;
}
 
MyStreamingHelper& operator<<(MyStreamingHelper& h, std::ostream&(*f)(std::ostream&))
{
   h.out1_ << f;
   h.out2_ << f;
   return h;
}
 
int main()
{
   std::ofstream fl;
   fl.open("test.txt");
   MyStreamingHelper h(fl, std::cout);
   h << "!!!Hello World!!!" << std::endl << std::flush;
   return 0;
}
 

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