find1.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 "algostuff.hpp"
using namespace std;

int main()
{
    list<int> coll;

    INSERT_ELEMENTS(coll,1,9);
    INSERT_ELEMENTS(coll,1,9);

    PRINT_ELEMENTS(coll,"coll: ");

    // find first element with value 4
    list<int>::iterator pos1;
    pos1 = find (coll.begin(), coll.end(),    // range
                 4);                          // value

    /* find second element with value 4
     * - note: continue the search behind the first 4 (if any)
     */
    list<int>::iterator pos2;
    if (pos1 != coll.end()) {
        pos2 = find (++pos1, coll.end(),      // range
                     4);                      // value
    }

    /* print all elements from first to second 4 (both included)
     * - note: now we need the position of the first 4 again (if any)
     * - note: we have to pass the position behind the second 4 (if any)
     */
    if (pos1!=coll.end() && pos2!=coll.end()) {
        copy (--pos1, ++pos2,
              ostream_iterator<int>(cout," "));
        cout << endl;
    }
}