examples/manual/set_diff.cpp

/**************************************************************************
 *
 * set_diff.cpp - Example program of set differences algorithm. 
 *
 * $Id: //stdlib/dev/examples/stdlib/manual/set_diff.cpp#11 $
 *
 ***************************************************************************
 *
 * Copyright (c) 1994-2005 Quovadx,  Inc., acting through its  Rogue Wave
 * Software division. Licensed under the Apache License, Version 2.0 (the
 * "License");  you may  not use this file except  in compliance with the
 * License.    You    may   obtain   a   copy   of    the   License    at
 * http://www.apache.org/licenses/LICENSE-2.0.    Unless   required    by
 * applicable law  or agreed to  in writing,  software  distributed under
 * the License is distributed on an "AS IS" BASIS,  WITHOUT WARRANTIES OR
 * CONDITIONS OF  ANY KIND, either  express or implied.  See  the License
 * for the specific language governing permissions  and limitations under
 * the License.
 * 
 **************************************************************************/

#include <algorithm>
#include <set>
#include <iostream>
#include <iterator>


int main ()
{
    // Initialize some sets.
    const int a1 [] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
    const int a2 [] = { 2, 4, 6, 8, 10, 12 };

    std::set<int, std::less<int>, std::allocator<int>  >
        all (a1+0, a1+10),
        even (a2+0, a2+6),
        odd;

    // Create an insert_iterator for odd.
    std::insert_iterator<std::set <int, std::less<int>, std::allocator<int> > >
        odd_ins (odd, odd.begin ());

    // Demonstrate set_difference.
    typedef std::ostream_iterator<int, char, std::char_traits<char> > Iter;

    std::cout << "The result of:\n{";

    std::copy (all.begin (), all.end (), Iter (std::cout, " "));
    std::cout << "} - {";

    std::copy (even.begin (), even.end (), Iter (std::cout, " "));
    std::cout << "} =\n{";

    std::set_difference (all.begin (), all.end (),
                         even.begin (), even.end (),
                         odd_ins);

    std::copy (odd.begin (),odd.end (), Iter (std::cout," "));
    std::cout << "}\n\n";

    return 0;
}