C++ Tutorial/list/list const iterator

/* 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 <list>
using namespace std;
int main()
{
    list<char> coll;      // list container for character elements
    // append elements from "a" to "z"
    for (char c="a"; c<="z"; ++c) {
        coll.push_back(c);
    }
    /* print all elements
     * - iterate over all elements
     */
    list<char>::const_iterator pos;
    for (pos = coll.begin(); pos != coll.end(); ++pos) {
        cout << *pos << " ";
    }
    cout << endl;
}