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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. struct CommonBase {
  5. 	CommonBase() : CommonBase(0) {}
  6.  
  7. 	CommonBase(int val) : value(val) {}
  8.  
  9. 	const int value;
  10. };
  11.  
  12. struct DerivedA : public virtual CommonBase {
  13. 	void printValue() {
  14. 		std::cout << "The value is " << value << "\n";
  15. 	}
  16. };
  17.  
  18. struct DerivedB : public virtual CommonBase {
  19. 	void printValueTimes2() {
  20. 		std::cout << "value * 2 is " << value * 2 << "\n";
  21. 	}
  22. };
  23.  
  24. struct Joined : public DerivedA,
  25. 				public DerivedB {
  26. 	Joined(int val) : CommonBase(val) {
  27. 		std::cout << "Constructor value is " << val << "\n";
  28. 		std::cout << "Actual value is " << value << "\n";
  29. 	}
  30. };
  31.  
  32. struct JoinedDerivedA : public Joined {
  33. 	JoinedDerivedA() : Joined(99) {
  34. 		printValue();
  35. 	}
  36. };
  37.  
  38. struct JoinedDerivedB : public Joined {
  39. 	JoinedDerivedB() : Joined(99), CommonBase(99) {
  40. 		printValue();
  41. 	}
  42. };
  43.  
  44. int main() {
  45. 	std::cout << "======= Joined =======\n";
  46. 	Joined j(99);
  47. 	j.printValue();
  48. 	std::cout << "\n=== JoinedDerivedA ===\n";
  49. 	JoinedDerivedA a;
  50. 	std::cout << "\n=== JoinedDerivedB ===\n";
  51. 	JoinedDerivedB b;
  52.  
  53. 	return 0;
  54. }
Success #stdin #stdout 0s 15232KB
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stdin
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Standard input is empty
stdout
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======= Joined =======
Constructor value is 99
Actual value is 99
The value is 99

=== JoinedDerivedA ===
Constructor value is 99
Actual value is 0
The value is 0

=== JoinedDerivedB ===
Constructor value is 99
Actual value is 99
The value is 99
https://ideone.com/Ie94kb
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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