examples/manual/mismatch.cpp

/**************************************************************************
 *
 * mismatch.cpp - Example program of comparing elements from two sequences
 *                and returning the first two elements that don't 
 *                match each other.
 *
 * $Id: //stdlib/dev/examples/stdlib/manual/mismatch.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>    // mismatch
#include <functional>   // less_equal
#include <iostream>     // cout, endl
#include <utility>      // pair
#include <vector>       // vector

#include <examples.h>


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

    const Vector::value_type d1[] = { 1, 2, 3, 4 };
    const Vector::value_type d2[] = { 1, 3, 2, 4 };

    // Set up two vectors.
    const Vector vi1 (d1 + 0, d1 + sizeof d1 / sizeof *d1);
    const Vector vi2 (d2 + 0, d2 + sizeof d2 / sizeof *d2);

    // p1 will contain two iterators that point to the first pair of
    // elements that are different between the two vectors.
    std::pair<Iter, Iter> p1 =
        std::mismatch (vi1.begin (), vi1.end (), vi2.begin ());	

    // Find the first two elements such that an element in the
    // first vector is greater than the element in the second vector.
    std::pair<Iter, Iter> p2 =
        std::mismatch (vi1.begin (), vi1.end (),
                       vi2.begin (), std::less_equal<int>());

    // Output results.
    std::cout << *p1.first << ", " << *p1.second << std::endl;
    std::cout << *p2.first << ", " << *p2.second << std::endl;

    return 0;
}