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  1. #include <iostream>
  2.  
  3. struct A
  4. {
  5. 	int a_;
  6.  
  7. 	A(int a)
  8. 		: a_(a)
  9. 	{
  10. 	}
  11.  
  12. 	virtual ~A()
  13. 	{
  14. 	}
  15. };
  16.  
  17. struct B :
  18. 	public A
  19. {
  20. 	int b_;
  21.  
  22. 	B(int a, int b)
  23. 		: A(a)
  24. 		, b_(b)
  25. 	{
  26. 	}
  27. };
  28.  
  29. struct C :
  30. 	public A
  31. {
  32. 	int c_;
  33.  
  34. 	C(int a, int c)
  35. 		: A(a)
  36. 		, c_(c)
  37. 	{
  38. 	}
  39. };
  40.  
  41. struct D
  42. {
  43. 	int d_;
  44.  
  45. 	D()
  46. 		: d_(0)
  47. 	{
  48. 	}
  49.  
  50. 	virtual int d()
  51. 	{
  52. 		return d_;
  53. 	}
  54. };
  55.  
  56. struct E :
  57. 	public D,
  58. 	public A
  59. {
  60. 	E()
  61. 		: D()
  62. 		, A(0)
  63. 	{
  64. 	}
  65. };
  66.  
  67. template <class Base, class Derived>
  68. bool is_differ(const Derived* der)
  69. {
  70. 	return (void*) der != (Base*) der;
  71. }
  72.  
  73. int main()
  74. {
  75. 	A* a = new A(5);
  76. 	B* b = new B(2, 3);
  77. 	C* c = new C(1, 4);
  78. 	E* e = new E();
  79.  
  80. 	std::cout << std::boolalpha;
  81. 	std::cout << "A* and B* differ: " << is_differ<A, B>(b) << std::endl;
  82. 	std::cout << "A* and C* differ: " << is_differ<A, C>(c) << std::endl;
  83. 	std::cout << "A* and E* differ: " << is_differ<A, E>(e) << std::endl;
  84. 	return 0;
  85. }
Success #stdin #stdout 0s 3428KB
comments (?)
stdin 
Standard input is empty
stdout 
A* and B* differ: false
A* and C* differ: false
A* and E* differ: true
https://ideone.com/chYjuN
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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