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  1. #include <set>
  2. #include <iostream>
  3.  
  4. struct A {
  5.     int i;
  6.     A() : i(0) {}
  7.     bool operator()(int a, int b)
  8.     {
  9.         ++i;
  10.         return a < b;
  11.     }
  12. };
  13.  
  14. int main()
  15. {    
  16.     A a;
  17.     std::set<int, A&> s1( {1, 2, 3}, a);
  18.     std::set<int, A&> s2( {4, 5, 6}, a);
  19.     std::cout << a.i;
  20. }
Success #stdin #stdout 0s 3472KB
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https://ideone.com/O85lFk
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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