advance.cpp

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#include <iterator>   // for advance
#include <iostream>   // for cout, endl
#include <list>       // for list
 
#include <examples.h>
 
 
int main ()
{
    // Typedefs for convenience.
    typedef std::list<long, std::allocator<long> > List;
    typedef std::ostream_iterator<List::value_type,
                                  char, std::char_traits<char> > os_iter;
 
    // Initialize a list using an array.
    const List::value_type arr [] = { 3, 4, 5, 6, 7, 8 };
    List l (arr + 0, arr + sizeof arr / sizeof *arr);
 
    // Declare a list iterator, s.b. a ForwardIterator.
    List::iterator itr = l.begin ();
 
    // Output the original list.
    std::cout << "For the list: ";
    std::copy (l.begin (), l.end (), os_iter (std::cout, " "));
 
    std::cout << std::endl << std::endl
              << "When the iterator is initialized to l.begin ()," 
              << "\nit points to " << *itr << std::endl;
 
    // operator+ is not available for a ForwardIterator, so use advance.
    std::advance (itr, 4);
    std::cout << "\nAfter advance (itr, 4), the iterator points to "
              << *itr << std::endl;
 
    return 0;
}