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  1. #include <iostream>
  2. #include <memory>
  3. using namespace std;
  4.  
  5. class AFriend;
  6.  
  7. class A {
  8.   friend class AFriend;
  9. private:
  10.   void f() { cout << "A" << endl; }
  11. };
  12.  
  13. class AFriend {
  14. public:
  15.   AFriend(A* a);
  16. private:
  17.   class impl;
  18.   std::unique_ptr<impl> pimpl;
  19. };
  20.  
  21. class AFriend::impl {
  22. public:
  23.   impl(A* a) { a->f(); }
  24. };
  25.  
  26. AFriend::AFriend(A* a) : pimpl(new impl(a))
  27. {
  28. }
  29.  
  30. int main() {
  31.   A a;
  32.   AFriend a_friand(&a);
  33. }
  34.  
Success #stdin #stdout 0s 3472KB
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A
https://ideone.com/p9KSV8
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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