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  1. #include <iostream>
  2. #include <stdio.h>
  3. using namespace std;
  4.  
  5. struct vtbltest
  6. {
  7. 	virtual int testvirt()
  8. 	{
  9. 		return 666;
  10. 	}
  11. };
  12.  
  13. template <class T>
  14. struct clearable
  15. {
  16. 	void *cleared;
  17. 	clearable():cleared(calloc(sizeof(T), 1)) {}
  18.  
  19. 	void clear()
  20. 	{
  21. 	    *((T*)this) = *((T*)cleared);
  22. 	};
  23. };
  24.  
  25. class test : public clearable<test>, public vtbltest
  26. {
  27. 	public:
  28. 		int a;
  29. };
  30.  
  31. class test2 : public clearable<test>, public vtbltest
  32. {
  33. 	public:
  34. 		int testvirt()
  35. 		{
  36. 			return 976;
  37. 		}
  38.  
  39. 		int a;
  40. };
  41.  
  42. int main() {
  43. 	test _test;
  44. 	_test.a=3;
  45. 	_test.clear();
  46. 	printf("%d, %d\n", _test.a, _test.testvirt());
  47.  
  48. 	test2 _test2;
  49. 	_test2.a=3;
  50. 	_test2.clear();
  51. 	printf("%d, %d\n", _test2.a, _test2.testvirt());
  52.  
  53. 	return 0;
  54. }
  55.  
Success #stdin #stdout 0s 3412KB
comments (?)
stdin
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Standard input is empty
stdout
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0, 666
0, 976
https://ideone.com/qTO6ka
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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