[nathacof]

I'm just wondering how the program presented at the end of the tutorial knows when to stop accepting words from the standard input.

    // This vector of strings will be holding the words as the user
    // enters them.
    vector<string> words;

    // std::ostream_iterator's evil twin, std::istream_iterator, can
    // be used for doing the opposite: turn an input stream into an
    // iterator. Here we keep copy all strings from cin to the back of
    // the words vector:
    copy (istream_iterator<string> (cin), 
          istream_iterator<string> (),    // "end"
          back_inserter (words));

This is the code that I don't really understand. When I compile the program and run it I can enter an infinite number of words without the program printing the list of words.

Maybe I just don't understand iterators enough.

istream_iterator();
     Construct an end-of-stream iterator.  This iterator can be used to
     compare against an end-of-stream condition. Use it to provide end
     iterators to algorithms

This is from http://h30097.www3.hp.com/cplus/istr...or_3c__std.htm
It seems that I just don't know how to close the stream?