examples/manual/random_shuffle.cpp

/**************************************************************************
 *
 * rndshufl.cpp - Example program of random shuffle algorithm.
 *
 * $Id$
 *
 ***************************************************************************
 *
 * Licensed to the Apache Software  Foundation (ASF) under one or more
 * contributor  license agreements.  See  the NOTICE  file distributed
 * with  this  work  for  additional information  regarding  copyright
 * ownership.   The ASF  licenses this  file to  you 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.
 *
 * Copyright 1994-2008 Rogue Wave Software, Inc.
 * 
 **************************************************************************/

#include <algorithm>   // for random_shuffle
#include <iostream>    // for cout
#include <iterator>    // for ostream_iterator
#include <string>      // for string

// #include <examples.h>


int main ()
{
    // Create a string of doubles (unusual? maybe, but why not...)
    typedef std::char_traits<double>                     Traits;
    typedef std::allocator<double>                       Allocator;
    typedef std::basic_string<double, Traits, Allocator> Bizarre;

    // Initialize a Bizarre with an array of values.
    const Bizarre::value_type a[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

    Bizarre b (a + 0, a + sizeof a / sizeof *a);

    typedef std::ostream_iterator<double, char, std::char_traits<char> >
        Iter;

    // Suppress decimal point in output.
    std::cout.precision (0);
    std::cout.setf (std::cout.fixed, std::cout.floatfield);

    // Print out elements in original (sorted) order.
    std::cout << "Elements before random_shuffle: \n     ";
    std::copy (b.begin (), b.end (), Iter (std::cout," "));

    // Mix them up with random_shuffle.
    std::random_shuffle (b.begin (), b.end ());

    // Print out the mixed up elements.
    std::cout << "\n\nElements after random_shuffle: \n     ";
    std::copy (b.begin (), b.end (), Iter (std::cout, " "));
    std::cout << '\n';

    return 0;
}