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  1. #include <map>
  2. #include <iostream>
  3.  
  4. struct Node {
  5.     int a;
  6.     int b;
  7. };
  8.  
  9. int main() {
  10.     Node node{ 2, 3 };
  11.  
  12.     auto comp = [](const Node& n1, const Node& n2) {
  13.         return n1.a < n2.a || (n1.a == n2.a && n1.b < n2.b);
  14.     };
  15.     std::map<Node, int, decltype(comp)> bb(comp);
  16.     bb[node] = 1;
  17.  
  18.     for (auto const &kv : bb)
  19.         std::cout << kv.first.a << ", " << kv.first.b << ": " << kv.second << std::endl;
  20.  
  21.     return 0;
  22. }
Success #stdin #stdout 0s 4392KB
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Standard input is empty
stdout
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2, 3: 1
https://ideone.com/XImpby
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
secret

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