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  1. #define THREE
  2.  
  3. struct Base {
  4.   int t_size;
  5.   Base (int i) : t_size(i) {}
  6.   virtual ~Base () {}
  7.   int size () const { return t_size; };
  8. };
  9.  
  10. struct D1 : virtual Base {
  11.   int a[10];
  12.   D1 () : Base(0) {}
  13.   ~D1 () {}
  14. };
  15. struct D2 : virtual Base {
  16.   int a[20];
  17.   D2() : Base(0) {}
  18.   ~D2 () {}
  19. };
  20.  
  21. #ifdef ONE
  22. struct Derived : Base
  23. #endif
  24. #ifdef TWO
  25. struct Derived : virtual Base
  26. #endif
  27. #ifdef THREE
  28. struct Derived : D1, D2
  29. #endif
  30. {
  31.   Derived () : Base(0) {}
  32.   ~Derived () {}
  33.   int a[100];
  34. };
  35.  
  36.  
  37. void foo (Derived *p) 
  38. {
  39.   if(p->size())
  40.     return;
  41.   p = 0;
  42. }
  43.  
  44. int main ()
  45. {
  46.   Derived d;
  47.   foo(&d);
  48. }
  49.  
Success #stdin #stdout 0.01s 2720KB
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https://ideone.com/MxtlJ
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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