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  1. #include <iostream>
  2. #include <type_traits>
  3.  
  4. template <typename Derived>
  5. struct A
  6. {
  7.  static void do_thing() { Derived::do_thing(); }
  8. };
  9.  
  10. struct B : public A<B>
  11. {
  12.   friend A<B>;
  13.  protected:
  14.   static void do_thing() { std::cout << "B impl" << std::endl; }
  15. };
  16.  
  17. struct C : public A<C>
  18. {
  19.   friend A<C>;
  20.  protected:
  21.   static void do_thing() { std::cout << "C impl" << std::endl; }
  22. };
  23.  
  24. int main() 
  25. {
  26.  A<B>::do_thing();
  27.  A<C>::do_thing();
  28.  
  29.  return (0);
  30. }
Success #stdin #stdout 0s 3296KB
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Standard input is empty
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B impl
C impl
https://ideone.com/wj4Hjz
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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