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  1. #include <unordered_set>
  2. #include <iostream>
  3.  
  4. int main() {
  5.     auto hash = [](const std::pair<int, int>& p){ return p.first * 31 + p.second; };
  6.     std::unordered_set<std::pair<int, int>, decltype(hash)> u_edge_(8, hash);
  7.  
  8.     u_edge_.emplace(1, 2);
  9.     u_edge_.emplace(3, 4);
  10.     u_edge_.emplace(5, 6);
  11.  
  12.     for (auto const &p : u_edge_)
  13.         std::cout << p.first << ", " << p.second << std::endl;
  14.  
  15. 	return 0;
  16. }
Success #stdin #stdout 0s 15240KB
comments (?)
stdin
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Standard input is empty
stdout
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5, 6
3, 4
1, 2
https://ideone.com/kIITo7
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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