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  1. #include <iostream>
  2. #include <fstream>
  3.  
  4. using namespace std;
  5.  
  6. class LoggedStream {
  7.   private:
  8.     ostream& out;
  9.   public:
  10.     LoggedStream(ostream& o):out(o){}
  11.     template<typename T>
  12.     const LoggedStream& operator<<(const T& v) const {
  13.       out << v;
  14.       return *this;
  15.     }
  16.     LoggedStream const& operator<<(std::ostream& (*func)(std::ostream&)) const { 
  17.       func(out); 
  18.       return *this; 
  19.     }
  20. };
  21.  
  22. int main(int,char**) {
  23.   LoggedStream Log1(std::cout);
  24.   Log1 << 1 << " 2" << endl << 3 << " 4" << endl;
  25.   //
  26.   std::ofstream ofs("test.txt", std::ofstream::out);
  27.   LoggedStream Log2(ofs);
  28.   Log2 << 1 << " 2" << endl << 3 << " 4" << endl;
  29. }
Success #stdin #stdout 0s 4544KB
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https://ideone.com/18bHmK
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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