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  1. #include <utility>
  2. 	#include <iostream>
  3. 	#include <string>
  4.  
  5. 	template <typename T>  
  6. 	struct to_string;
  7.  
  8. 	template <char... cs>  
  9. 	struct to_string<std::integer_sequence<char,cs...>>{
  10. 		std::string operator()() {
  11. 			return {cs...};
  12. 		}
  13. 	};
  14.  
  15. 	template <typename A, typename B>  
  16. 	struct seq_cat;
  17.  
  18. 	template <char... A, char... B>
  19. 	struct seq_cat<std::integer_sequence<char,A...>,
  20. 				std::integer_sequence<char,B...>>
  21. 	{
  22. 		using result_t = std::integer_sequence<char, A..., B...>;
  23. 	};
  24.  
  25. 	constexpr char binary_to_char(char b7, char b6, char b5, char b4, char b3,
  26. 								char b2, char b1, char b0) {
  27. 		return   (b7-'0') << 7 | (b6-'0') << 6
  28. 			| (b5-'0') << 5 | (b4-'0') << 4
  29. 			| (b3-'0') << 3 | (b2-'0') << 2
  30. 			| (b1-'0') << 1 | (b0-'0') << 0;
  31. 	}
  32.  
  33. 	template <char... cs>
  34. 	struct binary_to_ascii;
  35.  
  36. 	template <char b7, char b6, char b5, char b4, char b3, char b2, char b1, char b0>
  37. 	struct binary_to_ascii<b7,b6,b5,b4,b3,b2,b1,b0> {
  38. 		using result_t = std::integer_sequence
  39. 		< char,
  40. 		binary_to_char(b7,b6,b5,b4,b3,b2,b1,b0) >;
  41. 	};
  42.  
  43. 	template<char b7, char b6, char b5, char b4, char b3, char b2, char b1, char b0,
  44. 			char... rest>
  45. 	struct binary_to_ascii<b7,b6,b5,b4,b3,b2,b1,b0,rest...> {
  46. 		using result_t = typename seq_cat
  47. 		< std::integer_sequence< char, binary_to_char(b7,b6,b5,b4,b3,b2,b1,b0) >,
  48. 		typename binary_to_ascii<rest...>::result_t
  49. 		>::result_t;
  50. 	};
  51.  
  52. 	int main() {
  53. 		std::cout << to_string<binary_to_ascii<
  54. 			'0','1','1','0','0','0','0','1',
  55. 			'0','1','1','1','1','0','0','1',
  56. 			'0','1','1','1','1','0','0','1',
  57. 			'0','0','1','0','0','0','0','0',
  58. 			'0','1','1','0','1','1','0','0',
  59. 			'0','1','1','0','1','1','0','1',
  60. 			'0','1','1','0','0','0','0','1',
  61. 			'0','1','1','0','1','1','1','1'
  62. 		>::result_t>()() << "\n";
  63. 	}
Success #stdin #stdout 0s 3272KB
comments (?)
stdin 
Standard input is empty
stdout 
ayy lmao
https://ideone.com/gnwHWE
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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