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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. enum AType
  5. {
  6.     a1 = 1, a2
  7. };
  8.  
  9. class B
  10. {
  11. public:
  12.     virtual ~B() = default;
  13. public:
  14.     virtual int f() const = 0;
  15. };
  16.  
  17. class A1: public B
  18. {
  19.     virtual int f() const override
  20.     {
  21.         return 1;
  22.     }
  23. };
  24. class A2: public B
  25. {
  26.     virtual int f() const override
  27.     {
  28.         return 2;
  29.     }
  30. };
  31.  
  32. void executeF(void* aPtr, AType aType, int* result)
  33. {
  34.     B* bPtr = nullptr;
  35.     switch(aType)
  36.     {
  37.         case a1:
  38.             bPtr = static_cast<A1*>(aPtr);
  39.             break;
  40.         case a2:
  41.             bPtr = static_cast<A1*>(aPtr);
  42.             break;
  43.         default:
  44.             break;
  45.     }
  46.  
  47.     if(bPtr)
  48.         *result = bPtr->f();
  49. }
  50.  
  51. int main() {
  52. 	A1* a1Ptr = new A1();
  53. 	A2* a2Ptr = new A2();
  54.  
  55. 	void* a1VoidPtr = a1Ptr;
  56. 	void* a2VoidPtr = a2Ptr;
  57.  
  58. 	int res(0);
  59. 	executeF(a1VoidPtr, AType::a1, &res);
  60. 	cout << res << endl;
  61. 	executeF(a2VoidPtr, AType::a2, &res);
  62. 	cout << res << endl;
  63.  
  64. 	return 0;
  65. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/enNl3f
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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