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  1. #include <iostream>
  2.  
  3. using namespace std;
  4. class A {
  5. 	private:
  6. 	unsigned int counter =0;
  7. 	public:
  8. 	void update(){
  9. 		++counter;
  10. 	}
  11. 	void display()
  12. 	{
  13. 		cout << counter;
  14. 	}
  15. };
  16.  
  17. class B {
  18. 	private:
  19. 	A & a;
  20.  
  21. 	public:
  22. 	B(A & na ):a(na) { }
  23.  
  24. 	void run()
  25. 	{
  26. 		a.update();
  27. 	}
  28. };
  29.  
  30.  
  31. int main() {
  32. 	A a;
  33. 	B b1(a);
  34. 	B b2(a);
  35.  
  36. 	b1.run();
  37. 	b2.run();
  38. 	a.display();
  39.  
  40. 	return 0;
  41. }
Success #stdin #stdout 0s 15232KB
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https://ideone.com/5PkwzN
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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