swap.cpp

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#include <algorithm>   // for copy, iter_swap
#include <iostream>    // for cout, endl
#include <iterator>    // for ostream_iterator
#include <vector>      // for vector
 
int main ()
{
    typedef std::ostream_iterator<int, char, std::char_traits<char> > Iter;
 
    const int a[] = { 6, 7, 8, 9, 10, 1, 2, 3, 4, 5 };
 
    // Set up a vector.
    std::vector<int, std::allocator<int> > v (a, a + sizeof a / sizeof *a);
 
    // Output original vector.
    std::cout << "For the vector: ";
    std::copy (v.begin (), v.end (), Iter (std::cout, " "));
 
    // Swap the first five elements with the last five elements.
    std::swap_ranges (v.begin (), v.begin () + 5, v.begin () + 5);
 
    // Output result.
    std::cout << "\n\nSwaping the first five elements "
        "with the last five gives: \n     ";
 
    std::copy (v.begin (), v.end (), Iter (std::cout," "));
 
    // Now an example of iter_swap -- swap first and last elements.
    std::iter_swap (v.begin(), v.end () - 1);
 
    // Output result.
    std::cout << "\n\nSwaping the first and last elements gives: \n     ";
    std::copy (v.begin (), v.end (), Iter (std::cout, " "));
 
    std::cout << std::endl;
 
    return 0;
}