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 <iterator>
using namespace std;
int main()
{
// input stream buffer iterator for cin
istreambuf_iterator<char> inpos(cin);
// end-of-stream iterator
istreambuf_iterator<char> endpos;
// output stream buffer iterator for cout
ostreambuf_iterator<char> outpos(cout);
// while input iterator is valid
while (inpos != endpos) {
*outpos = *inpos; // assign its value to the output iterator
++inpos;
++outpos;
}
}