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  1. #include <iostream>
  2. #include <utility>
  3.  
  4. template <class T1, class T2>
  5. class myPair {
  6.     std::pair<T1, T2> member;
  7. public:
  8.     myPair() = default;
  9.     myPair(T1 x, T2 y) : member(std::make_pair(x, y)) {}
  10.  
  11. 	template <std::size_t N>
  12. 	const auto& operator[](std::integral_constant<std::size_t, N>) const {
  13. 	    static_assert(N < 2, "Index out of range");
  14.  
  15. 	    return std::get<N>(member);
  16. 	}
  17.  
  18. 	template <std::size_t N>
  19. 	auto& operator[](std::integral_constant<std::size_t, N>) {
  20. 	    static_assert(N < 2, "Index out of range");
  21.  
  22. 	    return std::get<N>(member);
  23. 	}
  24. };
  25.  
  26. template <std::size_t N>
  27. using uint_ = std::integral_constant<std::size_t, N>;
  28.  
  29. int main() {
  30. 	myPair<std::string, int> p("Hello", 42);
  31.  
  32. 	std::cout << p[uint_<0>{}] << " " << p[uint_<1>{}] << std::endl;
  33. }
Success #stdin #stdout 0s 3456KB
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stdin
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Standard input is empty
stdout
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Hello 42
https://ideone.com/BdnJbh
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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