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  1. #include <set>
  2. #include <string>
  3. #include <iostream>
  4.  
  5. struct Bar {
  6.     Bar(std::string s) : str(s) {}
  7.     std::string str;
  8. };
  9.  
  10. struct Foo {
  11.     Foo(Bar* p) : pBar(p) {}
  12.     Bar* pBar;
  13. };
  14.  
  15. int main() {
  16.     auto comp = [](const Foo* f1, const Foo* f2) { return f1->pBar->str < f2->pBar->str; };
  17.     std::set<Foo*, decltype(comp)> set_of_foos(comp);
  18.  
  19.     set_of_foos.emplace(new Foo(new Bar("x")));
  20.     set_of_foos.emplace(new Foo(new Bar("y")));
  21.  
  22.     auto it = set_of_foos.find(new Foo(new Bar("x")));
  23.     if (it == std::end(set_of_foos))
  24.         std::cout << "Element not found!" << std::endl;
  25.     else
  26.         std::cout << "Element found: " << (*it)->pBar->str << std::endl;
  27.  
  28. 	return 0;
  29. }
Success #stdin #stdout 0s 4552KB
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Standard input is empty
stdout
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Element found: x
https://ideone.com/wtSdiz
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
secret

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