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  1. #include <cstdio>
  2. #include <utility>
  3.  
  4. using namespace std;
  5.  
  6. struct Heavy
  7. {
  8.     Heavy() { printf("h "); }
  9.     Heavy(const Heavy&) { printf("H "); }
  10. };
  11.  
  12. template<int N, class... Args> struct getter;
  13. template<class A, class... Args> struct getter<0,A,Args...>
  14. {
  15.     typedef A type;
  16.     static type const& get(A const& a, Args&&...) { printf("0 "); return a; }
  17. };
  18. template<int N, class A, class... Args> struct getter<N,A,Args...>
  19. {
  20.     typedef getter<N-1,Args...> base;
  21.     typedef typename base::type type;
  22.     static type const& get(A const& a, Args&&... args)
  23.     {
  24.         printf("%d ", N);
  25.         return base::get(forward<Args>(args)...);
  26.     }
  27. };
  28.  
  29. template<int N, class... Args>
  30. typename getter<N,Args...>::type const&
  31. get(Args&&... args)
  32. {
  33.     printf("go ");
  34.     return getter<N,Args...>::get(forward<Args>(args)...);
  35. }
  36.  
  37. int main()
  38. {
  39.     get<4>(0,1,2,3,4, Heavy(), 6,7,8,9);
  40.     printf("\n");
  41.     get<5>(0,1,2,3,4, Heavy(), 6,7,8,9);
  42.     printf("\n");
  43.     get<9>(0,1,2,3,4, Heavy(), 6,7,8,9);
  44.     printf("\n");
  45. }
  46.  
Success #stdin #stdout 0s 3296KB
comments (?)
stdin 
Standard input is empty
stdout 
h go 4 3 2 1 0 
h go 5 4 3 2 1 0 
h go 9 8 7 6 5 4 3 2 1 0
https://ideone.com/QWKJgG
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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