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  1. #ifdef _WIN32
  2. #include <windows.h>
  3. #pragma warning(disable:4355)
  4. #endif//_WIN32
  5.  
  6. #include <string>
  7. #include <iostream>
  8.  
  9.  
  10. struct Base;
  11. struct Widget;
  12.  
  13. struct VCons
  14. {
  15. 	VCons() : caller(this), base(NULL), param(NULL)
  16. 	{}
  17.  
  18. 	VCons(const VCons& vc) : caller(&vc), base(NULL), param(NULL)
  19. 	{}
  20.  
  21. 	~VCons();
  22.  
  23. 	void Set(Base* c, Widget* p) const
  24. 	{
  25. 		base = c;
  26. 		param = p;
  27. 	}
  28.  
  29. private:
  30.  
  31. 	const VCons* caller;
  32. 	mutable Base* base;
  33. 	mutable Widget* param;
  34.  
  35. };
  36.  
  37.  
  38. struct Base
  39. {
  40. 	Base(Widget* p, VCons vc)
  41. 	{
  42. 		vc.Set(this, p);
  43. 	}
  44.  
  45. 	virtual void OnCreate(Widget* p)=0;
  46. };
  47.  
  48. struct Widget : public Base
  49. {
  50. 	Widget* parent;
  51.  
  52. 	Widget(Widget* p, VCons vc=VCons()) : Base(p, vc), parent(NULL)
  53. 	{}
  54.  
  55. 	void OnCreate(Widget* p)
  56. 	{
  57. 		parent = p;
  58. 	}
  59. };
  60.  
  61. struct Button : public Widget
  62. {
  63. 	Button(Widget* p, VCons vc=VCons()) : Widget(p, vc)
  64. 	{}
  65.  
  66. 	void OnCreate(Widget* p)
  67. 	{
  68. 		Widget::OnCreate(p);
  69. 		std::cout<<"Button"<<std::endl;
  70. 	}
  71. };
  72.  
  73. struct RadioButton : public Button
  74. {
  75. 	RadioButton(Widget* p, VCons vc=VCons()) : Button(p, vc)
  76. 	{}
  77.  
  78. 	void OnCreate(Widget* p)
  79. 	{
  80. 		Widget::OnCreate(p);
  81. 		std::cout<<"RadioButton"<<std::endl;
  82. 	}
  83. };
  84.  
  85. struct MainFrame : public Widget
  86. {
  87. 	Button button;
  88. 	RadioButton radio;
  89.  
  90. 	MainFrame(VCons vc=VCons()) : Widget(NULL, vc), button(this), radio(this)
  91. 	{}
  92.  
  93. 	void OnCreate(Widget* p)
  94. 	{		
  95. 		Widget::OnCreate(NULL);
  96. 		std::cout<<"MainFrame"<<std::endl;
  97. 	}
  98. };
  99.  
  100. VCons::~VCons()
  101. {
  102. 	if(caller == this)
  103. 		base->OnCreate(param);
  104. 	else
  105. 		caller->Set(base, param);
  106. }
  107.  
  108. int main()
  109. {
  110. 	MainFrame frame;
  111.  
  112. 	int i=0;
  113. 	std::cin>>i;
  114. 	return 0;
  115. }
  116.  
  117.  
Success #stdin #stdout 0s 3304KB
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Button
RadioButton
MainFrame
https://ideone.com/Heyh7T
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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