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  1. #include <iostream>
  2.  
  3. class B
  4. {
  5.     int b;
  6. };
  7.  
  8. namespace A { class window; }
  9.  
  10. B f(A::window);
  11.  
  12. namespace A{
  13.   class window{
  14.     private:
  15.     int a;
  16. //  friend B  ::f(window) ; //<<< Does not compile!
  17.     friend B (::f(window)); //<<< Parentheses here to avoid compilation error
  18.   };
  19. }
  20.  
  21. B f(A::window rhs){
  22.   std::cout << rhs.a << std::endl;
  23.   return B();
  24. }
  25.  
  26.  
  27. int main(void)
  28. {
  29. 	A::window w;
  30. 	B b = f(w);
  31. }
Success #stdin #stdout 0s 4404KB
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https://ideone.com/x38T88
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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