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c++boost-iostreams

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".

Solution

  • 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();
}