Redirect cout to a null sink using boost::iostreams.

null_stream.cpp

#include <boost/iostreams/stream_buffer.hpp>
#include <boost/iostreams/device/null.hpp>
#include <iostream>

namespace io = boost::iostreams;

int main()
{
    io::stream_buffer<io::null_sink> null_buf{io::null_sink()};
    std::cout.rdbuf(&null_buf);
    std::cout << "some junk" << std::endl;
}