The following code example is taken from the book
The C++ Standard Library - A Tutorial and Reference
by Nicolai M. Josuttis, Addison-Wesley, 1999
© Copyright Nicolai M. Josuttis 1999
#include <iostream>
#include "outbuf2.hpp"
int main()
{
fdostream out(1); // stream with buffer writing to file descriptor 1
out << "31 hexadecimal: " << std::hex << 31 << std::endl;
}