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  1. #include <iostream>
  2. using namespace std;
  3. class c;
  4.  
  5.  
  6. class a
  7. {
  8. 	public:
  9. 	int x;
  10. 	c& refC;
  11.  
  12. 	a(int a,c& objC):refC(objC)
  13. 	{
  14. 		x=a;
  15. 		std::cout<<"in a"<<x<<std::endl;
  16. 	}
  17. };
  18. class c
  19. {
  20. 	public:
  21. 	a& aRef;
  22. 	int y;
  23. 	c(a& ref):aRef(ref)
  24. 	{
  25. 		cout<<"in c"<<endl;
  26. 		y=10;
  27. 	}
  28. 	void print()
  29. 	{
  30. 		cout<<"value of y:"<<y<<endl;
  31. 	}
  32. };
  33. class b
  34. {
  35. 	public:
  36. 	a objA;
  37. 	c objC;
  38. 	b():objC(objA),objA(10,objC)
  39. 	{
  40. 		std::cout<<"in b"<<std::endl;
  41. 	}
  42. };
  43. int main() {
  44. 	// your code goes here
  45. 	b objB;
  46. 	return 0;
  47. }
Compilation error #stdin compilation error #stdout 0s 15232KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.cpp: In constructor ‘a::a(int, c&)’:
prog.cpp:16:7: error: invalid use of incomplete type ‘class c’
   refC.print();
       ^
prog.cpp:3:7: note: forward declaration of ‘class c’
 class c;
       ^
stdout
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Standard output is empty
https://ideone.com/vBVJmy
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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