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  1. #include <iostream>
  2. #include <string>
  3. #include <map>
  4. #include <assert.h>
  5.  
  6. struct IObj {
  7. 	//------ Подход 1 ----------------------------------------------
  8. 	struct ExtraOptionsBase {
  9. 		virtual ~ExtraOptionsBase() {}
  10. 	};	
  11.  
  12. 	virtual void SetEO( ExtraOptionsBase& ) = 0; // Можно сделдать дефолтную пустую реализацию
  13. 	virtual ExtraOptionsBase& GetEO() = 0;
  14.  
  15. 	//------ Подход 2 ----------------------------------------------
  16. 	virtual bool SetOption( const std::string& name, const int& value )  { return false; }
  17. 	virtual bool TryGetOption( const std::string& name, int& value ) { return false; }
  18. 	virtual bool SetOption( const std::string& name, const std::string& value ) { return false; }
  19. 	virtual bool TryGetOption( const std::string& name, std::string& value ) { return false; }
  20.  
  21. 	template<typename T> T GetOption( const std::string& name ) {
  22. 		T res = T();
  23. 		bool is_ok = this->TryGetOption( name, res ); 
  24. 		assert( is_ok );
  25. 		return res;
  26. 	}	
  27. };
  28.  
  29. template<typename T>
  30. struct CObj : public IObj {
  31. 	//------ Подход 1 ----------------------------------------------
  32. 	struct ExtraOptions : public IObj::ExtraOptionsBase {
  33. 		T Param1;
  34. 		T Param2;
  35.  
  36. 		T* getField( const std::string& name ) {
  37. 			if( name == "Param1" )
  38. 				return &this->Param1;
  39. 			if( name == "Param2" )
  40. 				return &this->Param2;
  41. 			return 0;
  42. 		}
  43. 	} Data;
  44.  
  45. 	virtual ExtraOptions& GetEO() { return this->Data; }
  46. 	virtual void SetEO( ExtraOptions& ed ) { this->Data = ed; }
  47. 	virtual void SetEO( ExtraOptionsBase& ed ) { this->Data = dynamic_cast<ExtraOptions&>(ed); }
  48.  
  49. 	//------ Подход 2 ----------------------------------------------
  50. 	virtual bool SetOption( const std::string& name, const T& value ) {
  51. 		T* field = this->Data.getField( name );
  52. 		if( field ) {
  53. 			*field = value;
  54. 			return true;
  55. 		}
  56. 		return false;
  57. 	}
  58.  
  59. 	virtual bool TryGetOption( const std::string& name, T& value ) { 
  60. 		T* field = this->Data.getField( name );
  61. 		if( field ) {
  62. 			value = *field;
  63. 			return true;
  64. 		}
  65. 		return false;
  66. 	}
  67. };
  68.  
  69.  
  70. using namespace std;
  71.  
  72. int main() {
  73.  
  74. 	std::map<std::string, int> pi = {
  75. 		{ "Param1", 5 },	
  76. 		{ "Param2", 10 },	
  77. 	};
  78. 	CObj<int> oi1, oi2;
  79. 	for( auto i = pi.begin(); i != pi.end(); ++i )
  80. 		oi1.SetOption( i->first, i->second );
  81. 	oi2.SetEO( oi1.GetEO() );
  82. 	std::cout << oi2.GetEO().Param1 << " " << oi2.GetOption<int>( "Param2" ) << std::endl;
  83.  
  84. 	std::map<std::string, std::string> ps = {
  85. 		{ "Param1", "Hello" },	
  86. 		{ "Param2", "world!" },	
  87. 	};
  88. 	CObj<std::string> os1;
  89. 	for( auto i = ps.begin(); i != ps.end(); ++i ) 
  90. 		os1.SetOption( i->first, i->second );
  91. 	std::cout << os1.GetEO().Param1 << " " << os1.GetOption<std::string>( "Param2" ) << std::endl;
  92.  
  93.  
  94.  
  95. 	// your code goes here
  96. 	return 0;
  97. }
Success #stdin #stdout 0s 4352KB
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Standard input is empty
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5 10
Hello world!
https://ideone.com/e7bQ52
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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