Unnamed

#include<algorithm>
#include<iostream>
#include<iterator>
#include<vector>

int
main()
{
    bool reverse = false;
    std::vector<int> v;

    for (int i = 0; i < 5; ++i)
    {
        v.push_back(i);
    }

    std::vector<int>::const_iterator beg, end;

    if (reverse == true)
    {
        //beg = v.rbegin();
        //end = v.rend();
    }
    else
    {
        beg = v.begin();
        end = v.end();
    }

    std::copy(beg, end, std::ostream_iterator<int>(std::cout, " "));
    std::cout << std::endl;

    return 0;
}