examples/manual/partial_sort.cpp

/**************************************************************************
 *
 * partsort.cpp - Example program of partial sort.
 *
 * $Id$
 *
 ***************************************************************************
 *
 * 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>   // for partial_sort
#include <iostream>    // for cout, endl
#include <iterator>    // for ostream_iterator
#include <vector>      // for vector

#include <examples.h>


int main()
{
    typedef std::vector<int, std::allocator<int> >                    Vector;
    typedef std::ostream_iterator<int, char, std::char_traits<char> > Iter;

    const Vector::value_type a[] = {
        17, 3,  5,  -4, 1, 12, -10, -1, 14, 7,
        -6, 8, 15, -11, 2, -2,  18,  4, -3, 0
    };

    Vector v1 (a + 0, a + sizeof a / sizeof *a);

    // Output original vector.
    std::cout << "For the vector: ";
    std::copy (v1.begin (), v1.end (), Iter (std::cout, " "));

    // Partial sort the first seven elements.
    std::partial_sort (v1.begin (), v1.begin () + 7, v1.end ());

    // Output result.
    std::cout << "\n\nA partial_sort of seven elements gives: \n     ";
    std::copy (v1.begin (), v1.end (), Iter (std::cout, " "));
    std::cout << std::endl;

    // A vector of ten elements.
    Vector v2 (Vector::size_type (10), 0);

    // Sort the last ten elements in v1 into v2.
    std::partial_sort_copy (v1.begin () + 10, v1.end (),
                            v2.begin (), v2.end ());

    // Output result.
    std::cout
        << "\nA partial_sort_copy of the last ten elements gives: \n     ";
    std::copy (v2.begin (), v2.end (), Iter (std::cout, " "));

    std::cout << std::endl;

    return 0;
}