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  1. #include <iostream>
  2.  
  3. #pragma mark - Tape
  4.  
  5. constexpr int Blank = -1;
  6.  
  7. template<int... xs>
  8. class Tape {
  9. public:
  10.     using type = Tape<xs...>;
  11.     constexpr static int length = sizeof...(xs);
  12. };
  13.  
  14. #pragma mark - Print
  15.  
  16. template<class T>
  17. void print(T);
  18.  
  19. template<>
  20. void print(Tape<>) {
  21.     std::cout << std::endl;
  22. }
  23.  
  24. template<int x, int... xs>
  25. void print(Tape<x, xs...>) {
  26.     if (x == Blank) {
  27.         std::cout << "_ ";
  28.     } else {
  29.         std::cout << x << " ";
  30.     }
  31.     print(Tape<xs...>());
  32. }
  33.  
  34. int main() {
  35. 	using tape = Tape<1, 2, 3, 4, 5>;
  36. 	print(tape());
  37. 	return 0;
  38. }
Success #stdin #stdout 0s 3412KB
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https://ideone.com/DBHSC6
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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