/* The following code example is taken from the book * "The C++ Standard Library - A Tutorial and Reference" * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided "as is" without express or implied * warranty, and with no claim as to its suitability for any purpose. */#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;    }}