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 <iterator>
using namespace std;
int main()
{
// create istream iterator that reads integers from cin
istream_iterator<int> intReader(cin);
// create end-of-stream iterator
istream_iterator<int> intReaderEOF;
/* while able to read tokens with istream iterator
* - write them twice
*/
while (intReader != intReaderEOF) {
cout << "once: " << *intReader << endl;
cout << "once again: " << *intReader << endl;
++intReader;
}
}