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  1. class source_of_B
  2. {
  3.   class B &source;
  4.   source_of_B(B &source): source(source) {}
  5.   friend class A;
  6.   friend class B;
  7. };
  8. class B
  9. {
  10.   int x;
  11.   B(int x): x(x) {}
  12.   friend class A;
  13. public:
  14.   B(const source_of_B &arg): x(arg.source.x) {}
  15. };
  16. class A
  17. {
  18.   B b;
  19. public:
  20.   A(): b(5) {}
  21.   source_of_B create_object() { return b; }
  22.   B create_object2() { return b; }
  23. };
  24.  
  25. int main()
  26. {
  27.   A a;
  28.   B b = a.create_object();
  29.   auto b2 = a.create_object2();
  30. }
Success #stdin #stdout 0s 3292KB
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https://ideone.com/w1jKAd
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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