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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class A0{ //saparate here to make identity 
  5. 	public:
  6. 	enum ENU{
  7. 	    T1,T2	
  8. 	};
  9. };
  10. namespace namesp {
  11. 	template<typename T>
  12. 	struct identity { typedef T type; };  
  13.  
  14. 	template <A0::ENU T>
  15. 	struct EnumToBuiltin {
  16. 	};
  17.  
  18. 	template <>
  19. 	struct EnumToBuiltin<A0::T1> {
  20. 	  typedef int type;
  21. 	};
  22. 	template <>
  23. 	struct EnumToBuiltin<A0::T2> {
  24. 	  typedef std::string type;
  25. 	}; 
  26. }
  27.  
  28. class B : public A0{
  29. 	public:
  30. 	int b=123;
  31. 	std::string c="I am C";
  32. 	template<ENU ttt> typename namesp::EnumToBuiltin<ttt>::type f(){
  33. 	    return getField_(namesp::EnumToBuiltin<ttt>());
  34. 	}
  35. 	int getField_(namesp::EnumToBuiltin<T1>){
  36. 		return b;
  37. 	}
  38. 	std::string getField_(namesp::EnumToBuiltin<T2>){
  39. 		return c;
  40. 	}
  41. };
  42.  
  43. int main() {
  44. 	B b;
  45.     cout<< b.f<B::T1>(); //int
  46. 	cout<< b.f<B::T2>(); //string
  47. 	return 0;
  48. }
Success #stdin #stdout 0s 3468KB
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123I am C
https://ideone.com/ryNCml
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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