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  1. #include <set>
  2. #include <string>
  3. #include <iostream>
  4.  
  5. struct test {
  6.     std::string key;
  7.     std::string data;
  8. };
  9.  
  10. auto comp = [](const test& t1, const test& t2) { return t1.key < t2.key; };
  11. std::set<test, decltype(comp)> s(comp);
  12.  
  13. int main() {
  14.     test newmember;
  15.     newmember.key = "key";
  16.     newmember.data = "data";
  17.     s.insert(newmember);
  18.  
  19.     auto it = s.find(test{ "key", "" });
  20.     std::cout << "(1) " << it->key << ", " << it->data << std::endl;
  21.  
  22.     newmember.data = "otherdata";
  23.     s.insert(newmember);  // Insertion fails!
  24.     for (auto const& t : s) {
  25.         std::cout << "(2) " << t.key << ", " << t.data << std::endl;
  26.     }
  27.  
  28. 	return 0;
  29. }
Success #stdin #stdout 0s 4192KB
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stdin
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Standard input is empty
stdout
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(1) key, data
(2) key, data
https://ideone.com/r29qyA
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
secret

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