unique.cpp

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#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;
}