advance1.cpp

来自「stl自带源码」· C++ 代码 · 共 42 行

/* 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>
#include <algorithm>
using namespace std;

int main()
{
    list<int> coll;

    // insert elements from 1 to 9
    for (int i=1; i<=9; ++i) {
        coll.push_back(i);
    }

    list<int>::iterator pos = coll.begin();

    // print actual element
    cout << *pos << endl;

    // step three elements forward
    advance (pos, 3);

    // print actual element
    cout << *pos << endl;

    // step one element backward
    advance (pos, -1);

    // print actual element
    cout << *pos << endl;
}