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  1. #include <iostream>
  2. #include <utility>
  3. class Bar;
  4. class Foo
  5. {
  6.     Bar& refBar;
  7. public:
  8.     int n;
  9.     Foo(Bar& refBar) : refBar(refBar), n(1) {}
  10.     void show() const;
  11. };
  12.  
  13. class Bar
  14. {
  15.     Foo& refFoo;
  16. public:
  17.     int n;
  18.     Bar(Foo& refFoo) : refFoo(refFoo), n(2) {}
  19.     void show() const;
  20. };
  21.  
  22. void Foo::show() const
  23. {
  24.     std::cout << "Foo.n is " << n
  25.               << " Foo.refBar.n is " << refBar.n
  26.               << '\n';
  27. }
  28.  
  29. void Bar::show() const
  30. {
  31.      std::cout << "Bar.n is " << n 
  32.                << " Bar.refFoo.n is " << refFoo.n
  33.                << '\n';
  34. }
  35.  
  36. int main()
  37. {
  38.     std::pair<Foo, Bar> p(p.second, p.first);
  39.     p.first.show();
  40.     p.second.show();
  41. }
  42.  
Success #stdin #stdout 0.01s 2724KB
comments (?)
stdin
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Standard input is empty
stdout
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Foo.n is 1 Foo.refBar.n is 2
Bar.n is 2 Bar.refFoo.n is 1
https://ideone.com/qTGtJ
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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