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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. struct B 
  5. {
  6. 	int b;
  7. 	virtual ~B() {};
  8. 	virtual void show() { std::cout << "B::show();\n"; };
  9. };
  10.  
  11. struct X: virtual public B
  12. {
  13. 	int x;
  14. };
  15.  
  16. struct Y: virtual public B
  17. {
  18. 	int y;
  19. };
  20.  
  21. struct C: virtual public X, virtual public Y
  22. {
  23. 	/*virtual*/ void show() { std::cout << "C::show()\n"; };
  24. };
  25.  
  26. int main() {
  27. 	B *b = new B;
  28. 	C *c = (C*) b;
  29. 	delete c;
  30. 	return 0;
  31. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In function ‘int main()’:
prog.cpp:28:14: error: cannot convert from pointer to base class ‘B’ to pointer to derived class ‘C’ because the base is virtual
  C *c = (C*) b;
              ^
stdout
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Standard output is empty
https://ideone.com/i6poKh
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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