examples/manual/unique.cpp

/**************************************************************************
 *
 * unique.cpp - Example program of unique 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 1994-2006 Rogue Wave Software.
 * 
 **************************************************************************/

#include <algorithm>   // for copy, unique_copy
#include <iostream>    // for cout, endl
#include <iterator>    // for insert_iterator, ostream_iterator
#include <vector>      // for vector

int main ()
{
    // for convenience
    typedef std::vector<int, std::allocator<int> >          Vector;
    typedef std::insert_iterator<Vector>                    Iter;
    typedef std::ostream_iterator<Vector::value_type, char,
                                  std::char_traits<char> >  OSIter;

    // Initialize two vectors.
    const int a1 [] = {
        4, 5, 5, 9, -1, -1, -1, 3, 7, 5, 
        5, 5, 6, 7,  7,  7,  4, 2, 1, 1
    };

    Vector v (a1, a1 + sizeof a1 / sizeof *a1);
    Vector result;

    // Create an insert_iterator for results.
    Iter ins (result, result.begin ());

    // Demonstrate includes.
    std::cout << "The vector: " << std::endl << "    ";

    std::copy (v.begin (), v.end (), OSIter (std::cout, " "));

    // Find the unique elements.
    std::unique_copy(v.begin(), v.end(), ins);

    // Display the results.
    std::cout << "\n\nHas the following unique elements:\n     ";

    std::copy (result.begin (), result.end (), OSIter (std::cout, " "));
    std::cout << std::endl;
    
    return 0;
}