examples/manual/find_end.cpp

/**************************************************************************
 *
 * find_end.cpp - Example program for finding a subsequence. 
 *
 * $Id: //stdlib/dev/examples/stdlib/manual/find_end.cpp#12 $
 *
 ***************************************************************************
 *
 * 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 find_first_of(), find_end()
#include <functional>  // for equal_to
#include <iostream>    // for cout, endl
#include <iterator>    // for ostream_iterator
#include <list>        // for list

#include <examples.h>


int main ()
{
    typedef std::list<int, std::allocator<int> > List;

    const List::value_type a1[] = { 0, 1, 6, 5, 3, 2, 2, 6, 5, 7 };
    const List::value_type a2[] = { 6, 5, 0, 0 };

    // Set up two sequences.
    const List l1 (a1, a1 + sizeof a1 / sizeof *a1);
    const List l2 (a2, a2 + 2);

    // Try both find_first_of variants.
    List::const_iterator it1 =
        std::find_first_of (l1.begin (), l1.end (), l2.begin (), l2.end ());

    List::const_iterator it2 =
        std::find_first_of (l1.begin (), l1.end (), l2.begin (), l2.end (),
                            std::equal_to<List::value_type>());

    // Try both find_end variants.
    List::const_iterator it3 =
        std::find_end (l1.begin (), l1.end (), l2.begin (), l2.end ()); 

    List::const_iterator it4 =
        std::find_end (l1.begin (), l1.end (), l2.begin (), l2.end (),
                       std::equal_to<List::value_type>());

    // Output results of find_first_of.
    // Iterator now points to the first element that matches
    // one of a set of values.

    std::ostream_iterator<List::value_type, 
                          char,
                          std::char_traits<char> > out (std::cout, " " );

    if (it3 == it4 && it1 == it2) {

        std::cout << "For the sequences { ";
        std::copy (l1.begin (), l1.end (), out);

        std::cout << "} and { ";
        std::copy (l2.begin (), l2.end (), out);
             
        std::cout << "} \nboth versions of find_first_of point to: "
                  << *it1 << std::endl;

        // Output results of find_end.
        // Iterator now points to the first element of the last
        // find subsequence.

        std::cout << "both versions of find_end point to: "
                  << *it3 << std::endl;
    }

    return 0;
}