examples/manual/transform.cpp

/**************************************************************************
 *
 * trnsform.cpp - Example program of transform algorithm. 
 *
 * $Id$
 *
 ***************************************************************************
 *
 * 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 transform
#include <functional>   // for multiplies
#include <deque>        // for deque
#include <iostream>     // for cout, endl
#include <iomanip>      // for setw


int main ()
{
    typedef std::deque<int, std::allocator<int> > Deque;

    // Initialize a deque with an array of integers.
    const Deque::value_type a [] = { 99, 264, 126, 330, 132 };
    const Deque::value_type b [] = { 280, 105, 220, 84, 210 };

    Deque d1 (a, a + sizeof a / sizeof *a);
    Deque d2 (b, b + sizeof b / sizeof *b);

    // Print the original values.
    std::cout << "The following pairs of numbers: \n     ";
    Deque::iterator i1;
    for (i1 = d1.begin(); i1 != d1.end(); ++i1)
        std::cout << std::setw (6) << *i1 << " ";

    std::cout << "\n     ";
    for (i1 = d2.begin(); i1 != d2.end(); ++i1)
        std::cout << std::setw (6) << *i1 << " ";

    // transform the numbers in one sequence to their factorials
    // and store the results in another sequence
    std::transform (d1.begin (), d1.end (), d2.begin (), d1.begin (),
                    std::multiplies<int>());

    // Display the results.
    std::cout << "\n\nHave the products: \n     ";
    for (i1 = d1.begin (); i1 != d1.end (); ++i1)
        std::cout << std::setw (6) << *i1 << " ";

    std::cout << std::endl;

    return 0;
}