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  1. #include <iostream>
  2. #include <string>
  3. #include <set>
  4. using namespace std;
  5.  
  6. bool lexical_compare(int a, int b) {
  7.     return to_string(a) < to_string(b);
  8. };
  9.  
  10. int main() {
  11.     set<int, decltype(&lexical_compare)> s(&lexical_compare);
  12.  
  13.     s.insert(1);
  14.     s.insert(10);
  15.     s.insert(11);
  16.     s.insert(100);
  17.  
  18.     for (int x : s)
  19.         cout << x << ' ';
  20.  
  21.     return 0;
  22. }
Success #stdin #stdout 0s 15240KB
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stdin
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Standard input is empty
stdout
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1 10 100 11
https://ideone.com/tBwrUI
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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