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  1. #include <set>
  2. #include <iostream>
  3.  
  4. using pair_type = std::pair<int, int>;
  5.  
  6. auto comp = [](const pair_type& a, const pair_type& b) {
  7.     return (a.first < b.first) || ((a.first == b.first) && (a.second < b.second));
  8. };
  9.  
  10. class A{
  11. public:
  12.     A() : edge_(comp) {}
  13.     void test();
  14. private:
  15.     std::set<pair_type, decltype(comp)> edge_;
  16. };
  17.  
  18. void A::test()
  19. {
  20.     edge_.insert(std::make_pair(3, 2));
  21.     edge_.insert(std::make_pair(1, 2));
  22.     edge_.insert(std::make_pair(2, 1));
  23.     edge_.insert(std::make_pair(1, 1));
  24.  
  25.     for (auto const &e : edge_)
  26.         std::cout << e.first << " - " << e.second << std::endl;
  27. }
  28.  
  29. int main()
  30. {
  31.     A a;
  32.     a.test();
  33.     return 0;
  34. }
  35.  
Success #stdin #stdout 0s 4348KB
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https://ideone.com/2DVqKX
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
secret

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