C++ "hello world" Boost tee example program.

The Boost C++ library has Function Template tee

The class templates tee_filter and tee_device provide two ways to split an output sequence so that all data is directed simultaneously to two different locations.

I am looking for a complete C++ example using Boost tee to output to standard out and to a file like "sample.txt".

From stackoverflow

• Previous question (not exactly a dupe) has an example.

• Based on help from the question John linked:

  #include <boost/iostreams/tee.hpp>
  #include <boost/iostreams/stream.hpp>
  #include <fstream>
  #include <iostream>
  
  using std::ostream;
  using std::ofstream;
  using std::cout;
  
  namespace bio = boost::iostreams;
  using bio::tee_device;
  using bio::stream;
  
  int main()
  {
      typedef tee_device<ostream, ofstream> TeeDevice;
      typedef stream<TeeDevice> TeeStream;
      ofstream ofs("sample.txt");
      TeeDevice my_tee(cout, ofs); 
      TeeStream my_split(my_tee);
      my_split << "Hello, World!\n";
      my_split.flush();
      my_split.close();
  }
  

  John Weldon : Thanks Matthew; nice.

  Matthew Flaschen : Thanks, cwhii. Done.