setalgos.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()
{
    int c1[] = { 1, 2, 2, 4, 6, 7, 7, 9 };
    int num1 = sizeof(c1) / sizeof(int);

    int c2[] = { 2, 2, 2, 3, 6, 6, 8, 9 };
    int num2 = sizeof(c2) / sizeof(int);

    // print source ranges
    cout << "c1:                         " ;
    copy (c1, c1+num1,
          ostream_iterator<int>(cout," "));
    cout << endl;
    cout << "c2:                         " ;
    copy (c2, c2+num2,
          ostream_iterator<int>(cout," "));
    cout << '\n' << endl;

    // sum the ranges by using merge()
    cout << "merge():                    ";
    merge (c1, c1+num1,
           c2, c2+num2,
           ostream_iterator<int>(cout," "));
    cout << endl;

    // unite the ranges by using set_union()
    cout << "set_union():                ";
    set_union (c1, c1+num1,
               c2, c2+num2,
               ostream_iterator<int>(cout," "));
    cout << endl;

    // intersect the ranges by using set_intersection()
    cout << "set_intersection():         ";
    set_intersection (c1, c1+num1,
                      c2, c2+num2,
                      ostream_iterator<int>(cout," "));
    cout << endl;

    // determine elements of first range without elements of second range
    // by using set_difference()
    cout << "set_difference():           ";
    set_difference (c1, c1+num1,
                    c2, c2+num2,
                    ostream_iterator<int>(cout," "));
    cout << endl;

    // determine difference the ranges with set_symmetric_difference()
    cout << "set_symmetric_difference(): ";
    set_symmetric_difference (c1, c1+num1,
                              c2, c2+num2,
                              ostream_iterator<int>(cout," "));
    cout << endl;
}