Shell Sort Using C++ STL

Here is a shell sort program was written by my good friend Tom from the United Kingdom using C++ STL. Thank you Tom for sharing your code to us.

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Program Listing

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

using namespace std;

enum class SortOrder
{
   Ascending,
   Descending
};

// based on https://gist.github.com/svdamani/dc57e4d1b00342d4507d
template <class Iter>
inline void selection_sort(Iter first, Iter last, SortOrder order)
{
   while (first != last)
   {
     if (order == SortOrder::Ascending)
       std::iter_swap(first, std::min_element(first, last));
     else
       std::iter_swap(first, std::max_element(first, last));

   ++first;
   }
}

int main()
{
   cout << "Original vector of Numbers\n";
   vector<int> v = { 2, 1, 5, 10, 3 };
   copy(begin(v), end(v), ostream_iterator<int>(cout, " "));

   cout << "\n\nVector sorted in ascending order:\n";
   selection_sort(begin(v), end(v), SortOrder::Ascending);
   copy(begin(v), end(v), ostream_iterator<int>(cout, " "));

   cout << "\n\nVector sorted in descending order:\n";
   selection_sort(begin(v), end(v), SortOrder::Descending);

   copy(begin(v), end(v), ostream_iterator<int>(cout, " "));

   cout << "\n\n";
   system("PAUSE");
}