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  1. #include <iostream>
  2. using namespace std;
  3. #define MAX 3
  4.  
  5. class hello_world
  6. {
  7. 	char *const buf;
  8. 	int stack_ptr, destructor_calls;
  9. 	bool init;
  10. public:
  11. 	// The recursive constructor
  12.  
  13. 	hello_world(char *const &str, int i = 0)
  14. 		: buf(str), stack_ptr(0), init(false), destructor_calls(0)
  15. 	{
  16. 		if (i == MAX)
  17. 		{
  18. 			buf[i] = '\0';
  19. 			cout << buf << endl;
  20. 			return;
  21. 		}
  22. 		buf[i] = '0';
  23. 		hello_world::hello_world(str, i + 1);
  24. 		buf[i] = '1';
  25. 		hello_world::hello_world(str, i + 1);
  26. 	}
  27.  
  28. 	// The recusive destructor
  29.  
  30. 	~hello_world()
  31. 	{
  32. 		++destructor_calls;
  33. 		if (!init) { cerr << "A destructor call within initialization has been terminated" << endl; return; }
  34.  
  35. 		int i = stack_ptr;
  36. 		if (i == MAX)
  37. 		{
  38. 			buf[i] = '\0';
  39. 			cout << buf << endl;
  40. 		}
  41. 		else
  42. 		{
  43. 			buf[i] = '0';
  44. 			++stack_ptr; // since a destructor cannot take parameters
  45. 			hello_world::~hello_world();
  46. 			--stack_ptr;
  47. 			buf[i] = '1';
  48. 			++stack_ptr;
  49. 			hello_world::~hello_world();
  50. 			--stack_ptr;
  51.  
  52. 			// Printing total number of calls at final call
  53. 			if (i == 0)
  54. 				 cout << endl << "\"destrucotr_calls\" = " <<
  55.  destructor_calls << endl;
  56. 		}
  57. 	}
  58.  
  59. 	void unlock()
  60. 	{
  61. 		init = true;
  62. 	}
  63. }; // end of class hello_world
  64.  
  65. int main()
  66. {
  67. 	char buf[MAX + 1];
  68. 	cout << "Calling hello_world class constructor..." << endl;
  69. 	hello_world h(buf);
  70. 	h.unlock();
  71. 	cout << "Calling hello_world class destructor..." << endl;
  72. 	return 0;
  73. }
  74.  
  75.  
  76. /*
  77. Output:
  78.  
  79. Calling hello_world class constructor...
  80. 000
  81. A destructor call within initialization has been terminated
  82. 001
  83. A destructor call within initialization has been terminated
  84. A destructor call within initialization has been terminated
  85. 010
  86. A destructor call within initialization has been terminated
  87. 011
  88. A destructor call within initialization has been terminated
  89. A destructor call within initialization has been terminated
  90. A destructor call within initialization has been terminated
  91. 100
  92. A destructor call within initialization has been terminated
  93. 101
  94. A destructor call within initialization has been terminated
  95. A destructor call within initialization has been terminated
  96. 110
  97. A destructor call within initialization has been terminated
  98. 111
  99. A destructor call within initialization has been terminated
  100. A destructor call within initialization has been terminated
  101. A destructor call within initialization has been terminated
  102. Calling hello_world class destructor...
  103. 000
  104. 001
  105. 010
  106. 011
  107. 100
  108. 101
  109. 110
  110. 111
  111.  
  112. "destrucotr_calls" = 15
  113. Press any key to continue . . .
  114.  
  115. */
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In constructor ‘hello_world::hello_world(char* const&, int)’:
prog.cpp:9: warning: ‘hello_world::init’ will be initialized after
prog.cpp:8: warning:   ‘int hello_world::destructor_calls’
prog.cpp:13: warning:   when initialized here
prog.cpp: In destructor ‘hello_world::~hello_world()’:
prog.cpp:45: error: no matching function for call to ‘hello_world::~hello_world()’
prog.cpp:30: note: candidates are: hello_world::~hello_world()
prog.cpp:49: error: no matching function for call to ‘hello_world::~hello_world()’
prog.cpp:30: note: candidates are: hello_world::~hello_world()
stdout
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Standard output is empty
https://ideone.com/jE8DA
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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