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How can I write my own stream?
I need to write a stream class and redirect cerr to it. Based on the class settings I will log it to a file or a database.

I need to use the class like below
#include <iostream>
#include <fstream>
int main()
{
      std::ofstream logFile("out.txt");
      std::streambuf *outbuf = std::cout.rdbuf(logFile.rdbuf());
      std::streambuf *errbuf = std::cerr.rdbuf(logFile.rdbuf());

      // do the actual work of the program;
      // GUI code and event loop would go here
      std::cout << "This would normally go to cout but goes to the log file\n";
      std::cerr << "This would normally go to cerr but goes to the log file \n";
      logFile << "This goes to the log file\n";
      // end of program body

      // restore the buffers
      std::cout.rdbuf(outbuf);
      std::cerr.rdbuf(errbuf);
}

But my class will log to the disk or log to a DBMS.

Regards,
Xavier

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