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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class IObject
  5. {
  6. public:
  7.     virtual int getType()=0;
  8. };
  9. class Base : public IObject
  10. {
  11. protected:
  12.     int val;
  13. public:
  14.     Base() { val = 1; }
  15.     virtual int getType();
  16. };
  17. int Base::getType() { return val; }
  18.  
  19. class Derived : public virtual Base //If I remove the virtual keyword here problem is solved.
  20. {
  21. public:
  22.     Derived() { val = 2; }
  23. };
  24.  
  25. int getVal( void* ptr ) 
  26. {
  27.     return ((IObject*)ptr)->getType();
  28. }
  29.  
  30. int main()
  31. {
  32.     IObject* ptr = new Derived();
  33.     cout << getVal(ptr) << endl;
  34.     return 0;
  35. }
Success #stdin #stdout 0s 3472KB
comments (?)
stdin 
Standard input is empty
stdout 
2
https://ideone.com/Edxn0O
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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