Using splice_after() in std::forward_list

1#include <forward_list>
2#include <iostream>
3
4int main() {
5  std::forward_list<int> list1{1, 2, 3};
6  std::forward_list<int> list2{4, 5, 6};
7
8  auto it = list1.begin();
9  list1.splice_after(it, list2, list2.begin());  
10
11  std::cout << "List 1: ";
12  for (auto i : list1) {
13    std::cout << i << ", ";
14  }
15
16  std::cout << "\nList 2: ";
17  for (auto i : list2) {
18    std::cout << i << ", ";
19  }
20}

1#include <forward_list>
2#include <iostream>
3
4int main() {
5  std::forward_list<int> list1{1, 2, 3};
6  std::forward_list<int> list2{4, 5, 6, 7};
7
8  auto it = list1.begin();
9  list1.splice_after(it, list2, list2.begin(),
10                     std::next(list2.begin(), 2));  
11
12  std::cout << "List 1: ";
13  for (auto i : list1) {
14    std::cout << i << ", ";
15  }
16
17  std::cout << "\nList 2: ";
18  for (auto i : list2) {
19    std::cout << i << ", ";
20  }
21}

1#include <forward_list>
2#include <iostream>
3
4int main() {
5  std::forward_list<int> list1{1, 2};
6  std::forward_list<int> list2{3, 4, 5};
7
8  list1.splice_after(list1.before_begin(),
9                     list2);  
10
11  std::cout << "List 1: ";
12  for (auto i : list1) {
13    std::cout << i << ", ";
14  }
15
16  std::cout << "\nList 2: ";
17  for (auto i : list2) {
18    std::cout << i << ", ";
19  }
20}