fork download
copy 
  1. #include <vector>
  2. #include <utility>
  3. #include <algorithm>
  4. #include <functional>
  5. #include <iostream>
  6.  
  7. using namespace std;
  8.  
  9. int main() {
  10.  
  11. 	vector<pair<int, int>> vec;
  12. 	for (int i = 0; i < 10; i++) {
  13. 	    vec.push_back(make_pair(10 - i, 0));
  14. 	}
  15.  
  16. 	 auto vecsort = [&vec] {
  17. 	  	sort(vec.begin(), vec.end(), 
  18. 	  	[] (pair<int, int> const &a, pair<int, int> const &b) {
  19.             return a.first < b.first;
  20.         });
  21. 	 };
  22.  
  23.     // vecsort will work as long as vec is in scope.
  24.     // vecsort will modify the original vector.
  25.     vecsort();
  26. 	for (auto i : vec) {
  27.         std::cout << '(' << i.first << ", " << i.second << ") ";
  28.     }
  29.     std::cout << endl;
  30.  
  31.     vec.push_back(make_pair(-42, 0));
  32.     vecsort();
  33. 	for (auto i : vec) {
  34.         std::cout << '(' << i.first << ", " << i.second << ") ";
  35.     }
  36.     std::cout << endl;
  37. }
Success #stdin #stdout 0s 3476KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
(1, 0) (2, 0) (3, 0) (4, 0) (5, 0) (6, 0) (7, 0) (8, 0) (9, 0) (10, 0) 
(-42, 0) (1, 0) (2, 0) (3, 0) (4, 0) (5, 0) (6, 0) (7, 0) (8, 0) (9, 0) (10, 0)
https://ideone.com/W2YQKW
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!