The following code example is taken from the book
The C++ Standard Library - A Tutorial and Reference, 2nd Edition
by Nicolai M. Josuttis, Addison Wesley Longman, 2012
Copyright © 2012 by Pearson Education, Inc. and Nicolai M. Josuttis
#include <iostream>
#include <fstream>
#include <string>
int main()
{
// write string to a temporarily created file stream (since C++11)
std::string s("hello");
std::ofstream("fstream2.tmp") << s << std::endl;
// write C-string to a temporarily created file stream
// - NOTE: wrote a pointer value before C++11
std::ofstream("fstream2.tmp", std::ios::app) << "world" << std::endl;
}