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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. template<class T>
  5. struct inspect_t
  6. {
  7. 	T* data;
  8. 	inspect_t(T* v):data(v) {}
  9. };
  10.  
  11. template<class T>
  12. inline inspect_t<T> inspect(T* v)
  13. {
  14. 	return inspect_t<T>(v);
  15. }
  16.  
  17. template<class C, class R, class T>
  18. basic_ostream<C,R>& operator << (basic_ostream<C,R>& out, const inspect_t<T>& t)
  19. {
  20. 	static const char *hexdigit = "0123456789ABCDEF";
  21. 	char *ptr = static_cast<char *>(static_cast<void *>(t.data));
  22. 	for(size_t i = 0; i < sizeof(T); i++)
  23. 	{
  24. 		int value = (static_cast<int>(ptr[i]))&0xFF;
  25. 		out << hexdigit[value/16] << hexdigit[value%16];
  26. 	}
  27. 	return out;
  28. }
  29.  
  30. struct Father
  31. {
  32. 	virtual void one() {}
  33. 	virtual void two() {}
  34. };
  35.  
  36. struct Mother
  37. {
  38. 	virtual void three() {}
  39. 	virtual void four() {}
  40. };
  41.  
  42. struct Child: public Father, public Mother
  43. {
  44. 	void five() {}
  45. 	void six() {}
  46. };
  47.  
  48. typedef int (*SimpleFP_t)();
  49. typedef void (Father::*FatherMFP_t)();
  50. typedef void (Mother::*MotherMFP_t)();
  51. typedef void (Child::*ChildMFP_t)();
  52.  
  53. int main()
  54. {
  55. 	cout << "Ordinary case:" << endl;
  56. 	int i = 0x12345678;
  57. 	cout << inspect(&i) << endl;
  58. 	double d = 3.141592653589793;
  59. 	cout << inspect(&d) << endl;
  60.  
  61. 	cout << "Simple pointer:" << endl;
  62. 	int *p = &i;
  63. 	cout << inspect(&p) << endl;
  64.  
  65. 	cout << "Simple function pointer:" << endl;
  66. 	SimpleFP_t fp = main;
  67. 	cout << inspect(&fp) << endl;
  68.  
  69. 	FatherMFP_t ffp;
  70. 	MotherMFP_t mfp;
  71. 	ChildMFP_t cfp;
  72. 	cout << "Parent's member function pointer:" << endl;
  73. 	ffp = &Father::one;   cout << inspect(&ffp) << endl;
  74. 	ffp = &Father::two;   cout << inspect(&ffp) << endl;
  75. 	mfp = &Mother::three; cout << inspect(&mfp) << endl;
  76. 	mfp = &Mother::four;  cout << inspect(&mfp) << endl;
  77.  
  78. 	cout << "Child's member function pointer, in Child's view:" << endl;
  79. 	cfp = &Child::one;   cout << inspect(&cfp) << endl;
  80. 	cfp = &Child::two;   cout << inspect(&cfp) << endl;
  81. 	cfp = &Child::three; cout << inspect(&cfp) << endl;
  82. 	cfp = &Child::four;  cout << inspect(&cfp) << endl;
  83. 	cfp = &Child::five;  cout << inspect(&cfp) << endl;
  84. 	cfp = &Child::six;   cout << inspect(&cfp) << endl;
  85.  
  86. 	cout << "Child's member function pointer, in Parent's view:" << endl;
  87. 	ffp = &Child::one;   cout << inspect(&ffp) << endl;
  88. 	ffp = &Child::two;   cout << inspect(&ffp) << endl;
  89. 	mfp = &Child::three; cout << inspect(&mfp) << endl;
  90. 	mfp = &Child::four;  cout << inspect(&mfp) << endl;
  91.  
  92. 	return 0;
  93. }
  94.  
Success #stdin #stdout 0s 3344KB
comments ()
stdin
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Standard input is empty
stdout
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Ordinary case:
78563412
182D4454FB210940
Simple pointer:
0077DDBF
Simple function pointer:
00860408
Parent's member function pointer:
0100000000000000
0500000000000000
0100000000000000
0500000000000000
Child's member function pointer, in Child's view:
0100000000000000
0500000000000000
0100000004000000
0500000004000000
708C040800000000
808C040800000000
Child's member function pointer, in Parent's view:
0100000000000000
0500000000000000
0100000000000000
0500000000000000
https://ideone.com/jBEPDT
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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