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  1. #include <iostream>
  2. #include <memory>
  3. #include <vector>
  4.  
  5. using namespace std;
  6.  
  7.  
  8. enum class CUSTOM_TYPE : std::uint32_t
  9. {
  10. 	CHAR_TYPE,
  11. 	INT_TYPE,
  12. 	FLOAT_TYPE,
  13. 	DOUBLE_TYPE,
  14. 	CLASS_TYPE
  15. };
  16.  
  17. struct Holder
  18. {
  19. 	CUSTOM_TYPE type;
  20. 	std::unique_ptr<void, std::function<void(void*)>> data;
  21.  
  22. 	template<typename T>
  23. 	Holder(CUSTOM_TYPE type, T* data_ptr)
  24. 	{
  25. 		auto deleter = [](void* data) {
  26. 			delete static_cast<T*>(data);
  27. 		};
  28.  
  29. 		this->type = type;
  30. 		this->data = std::unique_ptr<void, std::function<void(void*)>>(data_ptr, deleter);
  31. 	}
  32.  
  33. 	template<typename T>
  34. 	T* get()
  35. 	{
  36. 		return static_cast<T *>(this->data.get());
  37. 	}
  38. };
  39.  
  40. class Test
  41. {
  42. 	private:
  43. 		std::string word;
  44.  
  45. 	public:
  46. 		Test(std::string word) : word(word) { std::cout<<"CONSTRUCTED\n"; }
  47. 		~Test() { std::cout<<"DESTRUCTED\n"; }
  48.  
  49. 		void print()
  50. 		{
  51. 			std::cout<<this->word<<"\n";
  52. 		}
  53. };
  54.  
  55.  
  56. int main() {
  57.  
  58. 	std::vector<Holder> container;
  59. 	container.push_back(Holder{CUSTOM_TYPE::CHAR_TYPE, new char('A')});
  60. 	container.emplace_back(Holder{CUSTOM_TYPE::CHAR_TYPE, new char('B')});
  61. 	container.emplace_back(Holder{CUSTOM_TYPE::INT_TYPE, new int(1024)});
  62. 	container.emplace_back(Holder{CUSTOM_TYPE::FLOAT_TYPE, new float(98.98397)});
  63. 	container.emplace_back(Holder{CUSTOM_TYPE::DOUBLE_TYPE, new double(99.9942999997)});
  64. 	container.emplace_back(Holder{CUSTOM_TYPE::CLASS_TYPE, new Test("HELLO")});
  65. 	container.emplace_back(Holder{CUSTOM_TYPE::CLASS_TYPE, new Test("WORLD")});
  66.  
  67. 	for (Holder &h : container)
  68. 	{
  69. 		switch(h.type)
  70. 		{
  71. 			case CUSTOM_TYPE::CHAR_TYPE: {
  72. 				std::cout<<*h.get<char>()<<"\n";
  73. 			}
  74. 				break;
  75.  
  76. 			case CUSTOM_TYPE::INT_TYPE: {
  77. 				std::cout<<*h.get<int>()<<"\n";
  78. 			}
  79. 				break;
  80.  
  81. 			case CUSTOM_TYPE::FLOAT_TYPE: {
  82. 				std::cout<<*h.get<float>()<<"\n";
  83. 			}
  84. 				break;
  85.  
  86. 			case CUSTOM_TYPE::DOUBLE_TYPE: {
  87. 				std::cout<<*h.get<double>()<<"\n";
  88. 			}
  89. 				break;
  90.  
  91. 			case CUSTOM_TYPE::CLASS_TYPE: {
  92. 				h.get<Test>()->print();
  93. 			}
  94. 				break;
  95. 		}
  96. 	}
  97.  
  98. 	return 0;
  99. }
Success #stdin #stdout 0s 15248KB
comments (?)
stdin
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Standard input is empty
stdout
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CONSTRUCTED
CONSTRUCTED
A
B
1024
98.984
99.9943
HELLO
WORLD
DESTRUCTED
DESTRUCTED
https://ideone.com/hoyPzy
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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