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  1. #include <iostream>
  2. #include <sstream>
  3.  
  4. class cerr_redirector
  5. {
  6. public:
  7.     cerr_redirector(std::ostream& os)
  8.         :backup_(std::cerr.rdbuf())
  9.          ,sbuf_(os.rdbuf())
  10.     {
  11.         std::cerr.rdbuf(sbuf_);
  12.     }
  13.  
  14.     ~cerr_redirector()
  15.     {
  16.         std::cerr.rdbuf(backup_);
  17.     }
  18.  
  19. private:
  20.     cerr_redirector();
  21.     cerr_redirector(const cerr_redirector& copy);
  22.     cerr_redirector& operator =(const cerr_redirector& assign);
  23.  
  24.     std::streambuf* backup_;
  25.     std::streambuf* sbuf_;
  26. };
  27.  
  28.  
  29. int main()
  30. {
  31.     {
  32.         std::ostringstream os;
  33.         cerr_redirector redirector(os);
  34.         std::cerr << "This is written to the stream" << std::endl;
  35.  
  36.         std::cout << "This is written to stdout" << std::endl;
  37.  
  38.         std::cout << "and now: " << os.str() << std::endl;
  39.     }
  40.     std::cerr << "Redirector has been been destroyed. Standard error restored." << std::endl;
  41. }
  42.  
Success #stdin #stdout 0.01s 2860KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
This is written to stdout
and now: This is written to the stream
https://ideone.com/9DFJh
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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