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  1. #include <iostream>
  2. #include <cstdlib>
  3.  
  4. using namespace std;
  5.  
  6. struct IGetA
  7. {
  8.     virtual int getA() = 0;
  9. };
  10.  
  11. class Base : public IGetA
  12. {
  13. protected:
  14.     int a;
  15. public:
  16.     int getA()
  17.     {
  18.         return a;
  19.     }
  20. };
  21.  
  22. class Derived : public Base
  23. {
  24. protected:
  25.     int b;
  26. };
  27.  
  28. class Set
  29. {
  30. protected:
  31.     IGetA* dataArray;
  32. public:
  33.     void run1()
  34.     {
  35.         int c = 5;
  36.         dataArray = new Derived[c];
  37.         cout << dataArray[3].getA(); // case 1
  38.     }
  39. };
  40.  
  41. void run2(IGetA* b, int index )
  42. {
  43.     cout << b[index].getA();
  44. }
  45.  
  46. int main()
  47. {
  48.     Set set1;
  49.     set1.run1();//case 1
  50.  
  51.     Derived set2[5];
  52.     run2(set2, 3);// case 2
  53.  
  54.     return 0;
  55. }
Success #stdin #stdout 0.01s 2812KB
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0134514845
https://ideone.com/dfSj0
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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