Merging Sorted Lists in std::forward_list

1#include <forward_list>
2#include <iostream>
3
4int main() {
5  std::forward_list<int> list1{1, 3, 5};
6  std::forward_list<int> list2{2, 4, 6};
7
8  list1.merge(list2);  
9
10  for (int i : list1) {
11    std::cout << i << ' ';
12  }
13  std::cout << '\n';
14  for (int i : list2) {
15    std::cout << i << ' ';
16  }
17}

1#include <forward_list>
2#include <iostream>
3
4bool descendingOrder(int first, int second) {
5  return first > second;
6}
7
8int main() {
9  std::forward_list<int> list1 {5, 3, 1};
10  std::forward_list<int> list2 {6, 4, 2};
11
12  list1.merge(list2, descendingOrder);
13
14  for (int i : list1) {
15    std::cout << i << ' ';
16  }
17}