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  1. #include<iostream>
  2. class I{
  3. 	public:
  4. 		virtual void  f()=0;
  5. };
  6.  
  7. enum TYPE{
  8. 	TYPE_I,
  9. };
  10.  
  11. class Base{
  12. 	public:
  13. 		Base(){
  14. 			std::cout << "Base::Base()\n"; 
  15. 		}
  16.  
  17. 		virtual ~Base(){
  18. 			std::cout << "Base::~Base()\n"; 
  19. 		}
  20. 		virtual TYPE getType()=0;
  21. 		int i;
  22. };
  23.  
  24. class A : public Base, public I {
  25. 	public:
  26. 		A(){
  27. 			std::cout << "A::A()\n"; 
  28. 		}
  29. 		virtual ~A(){
  30. 			std::cout << "A::~A()\n"; 
  31. 		}
  32. 		virtual TYPE getType(){
  33. 			 std::cout << "A::getType()\n"; 
  34. 			return TYPE_I;
  35. 		}
  36. 		virtual void  f(){ std::cout << "A::f()\n"; }
  37.  
  38.  
  39. };
  40.  
  41. int main(){
  42. 	A *a=new A;
  43. 	void *vp=a;
  44. 	if(static_cast<Base*>(vp)->getType()==TYPE_I){
  45. 			std::cout << "call I::f()\n"; 
  46.  
  47. 			static_cast<I*>(vp)->f();
  48. 	}
  49. 	std::cout << "delete a\n"; 
  50. 	delete a;
  51. }
Success #stdin #stdout 0.01s 2856KB
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stdin
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Standard input is empty
stdout
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Base::Base()
A::A()
A::getType()
call I::f()
A::~A()
Base::~Base()
delete a
Base::~Base()
https://ideone.com/huV2b
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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