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  1. #include <iostream>
  2. #include <set>
  3.  
  4. struct A {
  5.     int i = 0;
  6.     bool operator()(int a, int b)
  7.     {
  8.         ++i;
  9.         return a < b;
  10.     }
  11. };
  12.  
  13. int main()
  14. {    
  15.     A a;
  16.  
  17.     std::set<int, A> s(a);
  18.  
  19. 	for (int j = 0; j < 10; ++j) {
  20. 		int const prev = s.key_comp().i;
  21. 		s.insert(j);
  22. 		std::cout << j << ": " << (s.key_comp().i - prev) << "\n";
  23. 	}
  24. }
  25.  
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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0: 0
1: 3
2: 4
3: 4
4: 5
5: 5
6: 6
7: 6
8: 6
9: 6
https://ideone.com/xSa524
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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