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  1.     #include <unordered_set>
  2.     #include <iostream>
  3.  
  4.     class MyClass {
  5.     public:
  6.         int i;
  7.         double d;
  8.         std::string s;
  9.     };
  10.  
  11.     int main() {
  12.         auto hash = [](const MyClass& mc){
  13.             return (std::hash<int>()(mc.i) * 31 + std::hash<double>()(mc.d)) * 31 + std::hash<std::string>()(mc.s);
  14.         };
  15.         auto equal = [](const MyClass& mc1, const MyClass& mc2){
  16.             return mc1.i == mc2.i && mc1.d == mc2.d && mc1.s == mc2.s;
  17.         };
  18.         std::unordered_set<MyClass, decltype(hash), decltype(equal)> mySet(8, hash, equal);
  19.  
  20.         mySet.insert({ 1, 4.0, "temp" });
  21.         mySet.insert({ 2, 7.0, "test" });
  22.         mySet.insert({ 3, 9.0, "toll" });
  23.  
  24.         for (auto const &mc : mySet)
  25.             std::cout << mc.i << ", " << mc.d << ", " << mc.s.c_str() << std::endl;
  26.  
  27.     	return 0;
  28.     }
Success #stdin #stdout 0s 15240KB
comments (?)
stdin 
Standard input is empty
stdout 
3, 9, toll
2, 7, test
1, 4, temp
https://ideone.com/ksjnVU
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
secret

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