Item 1. Iterators

Difficulty: 7

Every programmer who uses the standard library has to be aware of these common and not-so-common iterator mistakes. How many of them can you find?

The following program has at least four iterator-related problems. How many can you find?

int main() 
{
  vector<Date> e;
  copy( istream_iterator<Date>( cin ),
        istream_iterator<Date>(),
        back_inserter( e ) );
  vector<Date>::iterator first =
        find( e.begin(), e.end(), "01/01/95" );
  vector<Date>::iterator last =
        find( e.begin(), e.end(), "12/31/95" );
  *last = "12/30/95";
  copy( first,
        last,
        ostream_iterator<Date>( cout, "\n" ) );
  e.insert( --e.end(), TodaysDate() );
  copy( first,
        last,
        ostream_iterator<Date>( cout, "\n" ) );
}