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  1. #include <iostream>
  2. struct A;
  3. struct B
  4. {
  5.     A& ref;
  6.     int n;
  7.     B(A& a) : ref(a), n(1) {}
  8.     void show() const;
  9. };
  10.  
  11. struct A
  12. {
  13.     B& ref;
  14.     int n;
  15.     A(B& b) : ref(b), n(2) {}
  16.     void show() const;
  17. };
  18.  
  19. void A::show() const
  20. {
  21.     std::cout << "A.n is " << n
  22.               << " A.ref.n is " << ref.n
  23.               << " A.ref.ref.n is " << ref.ref.n
  24.               << " A.ref.ref.ref.n is " << ref.ref.ref.n
  25.               << '\n';
  26. }
  27.  
  28. void B::show() const
  29. {
  30.     std::cout << "B.n is " << n
  31.               << " B.ref.n is " << ref.n
  32.               << " B.ref.ref.n is " << ref.ref.n
  33.               << " B.ref.ref.ref.n is " << ref.ref.ref.n
  34.               << '\n';
  35. }
  36.  
  37. int main()
  38. {
  39. //    std::pair<A, B> pair(pair.second, pair.first);
  40.     struct {B first; A second;} pair = {pair.second, pair.first};
  41.     pair.first.show();
  42.     pair.second.show();
  43. }
  44.  
Success #stdin #stdout 0.02s 2724KB
comments (?)
stdin
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Standard input is empty
stdout
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B.n is 1 B.ref.n is 2 B.ref.ref.n is 1 B.ref.ref.ref.n is 2
A.n is 2 A.ref.n is 1 A.ref.ref.n is 2 A.ref.ref.ref.n is 1
https://ideone.com/QQEpA
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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