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  1.  
  2. #include <iostream>
  3.  
  4. class Foo
  5. {
  6. public:
  7.     Foo() : is{1,2,3,4,5,6,7,8,9,10},ds{1.1,2.2,3.3,4.4,5.5,6.6,7.7,8.8,9.9,10.1} {}
  8.  
  9.  
  10. 	template <typename T> struct type_c{};
  11. 	template <size_t I> struct int_c{};
  12.  
  13.     template<typename T,size_t I>
  14.     auto get() 
  15. 	{ return get_impl(type_c<T>(),int_c<I>()); }
  16. private:
  17.  
  18. 	template <size_t I>
  19. 	auto get_impl(type_c<int>,int_c<I>) 
  20. 	{ return is[I]; }
  21.  
  22. 	template <size_t I>
  23. 	auto get_impl(type_c<double>,int_c<I>) 
  24. 	{ return ds[I]; }
  25.  
  26.  
  27. 	int is[10];
  28. 	double ds[10];
  29. };
  30. int main() {
  31.     Foo foo;
  32.  
  33. 	int i = foo.get<int,0>();
  34. 	double d = foo.get<double,2>();
  35. 	std::cout << i << " " << d << std::endl;
  36.     return 0;
  37. }
Success #stdin #stdout 0s 4532KB
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Standard input is empty
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1 3.3
https://ideone.com/kkJQrA
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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