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  1. #include <iostream>
  2. #include <string>
  3. #include <tuple>
  4. #include <utility>
  5.  
  6. using namespace std;
  7.  
  8. template <typename Tuple, typename Func, size_t... index>
  9. void tuple_each_internal(Tuple const & tuple, Func func, index_sequence<index...>)
  10. {
  11. 	auto res = {
  12. 	    (func.template operator()<index>(get<index>(tuple)),
  13. 	     nullptr)...
  14. 	};
  15. }
  16.  
  17. template <typename Tuple, typename Func, typename Indices = make_index_sequence<tuple_size<Tuple>::value>>
  18. void tuple_each(Tuple const & tuple, Func func)
  19. {
  20.     tuple_each_internal(tuple, func, Indices());
  21. }
  22.  
  23. struct demo_functor_each {
  24.  
  25.     /* Case #1: "Each" callback */
  26.     //template <typename T>
  27.     //void operator ()(T&& t) { ; }
  28.  
  29.     /* Case #2: "Each with index as run-time parameter" callback */
  30.     //template <typename T>
  31.     //void operator ()(const size_t index, T&& t) { ; }
  32.  
  33.     /* Case #4: "Each with index as compile-time parameter" callback */
  34.     template <size_t index, typename T>
  35.     void operator ()(T&& ) {}
  36.  
  37. };
  38.  
  39. void Example_Usage()
  40. {
  41.  
  42. }
  43.  
  44.  
  45. int main() {
  46.     tuple<int, bool, string> t;
  47.     tuple_each(t, demo_functor_each());
  48. }
Success #stdin #stdout 0s 3136KB
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https://ideone.com/aylOql
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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