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  1. #include <iostream>
  2. #include <functional>
  3. #include <unordered_set>
  4.  
  5. struct X
  6. {
  7.     std::string key_;
  8. };
  9.  
  10. int main() {
  11. 	std::unordered_set<X,
  12. 	                   std::function<size_t(const X&)>,
  13. 	                   std::function<bool(const X&, const X&)> > s{
  14. 	         5, // initial bucket count
  15. 	         [](const X& x) { return std::hash<decltype(x.key_)>()(x.key_); },
  16. 	         [](const X& lhs, const X& rhs) { return lhs.key_ == rhs.key_; }
  17. 	     };
  18.     s.insert({"one"});
  19.     s.insert({"two"});
  20.     s.insert({"three"});
  21. 	for (auto& x : s)
  22. 	    std::cout << x.key_ << '\n';
  23. }
Success #stdin #stdout 0s 3276KB
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stdin
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Standard input is empty
stdout
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three
two
one
https://ideone.com/f0qKF1
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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