distance.cpp

stl自带源码

/* 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 -3 to 9
    for (int i=-3; i<=9; ++i) {
        coll.push_back(i);
    }

    // search element with value 5
    list<int>::iterator pos;
    pos = find (coll.begin(), coll.end(),    // range
                5);                          // value

    if (pos != coll.end()) {
        // process and print difference from the beginning
        cout << "difference between beginning and 5: "
             << distance(coll.begin(),pos) << endl;
    }
    else {
        cout << "5 not found" << endl;
    }
}