Removing Consecutive Duplicates in std::forward_list

1#include <forward_list>
2#include <iostream>
3
4int main() {
5  std::forward_list<int> list{
6    1, 2, 2, 3, 3, 3, 4, 4, 5};
7
8  list.sort();    
9  list.unique();  
10
11  for (int i : list) {
12    std::cout << i << ' ';
13  }
14}

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