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  1. #include <iostream>
  2. #include <functional>
  3. using namespace std;
  4.  
  5. struct Functor 
  6. {
  7.     template<typename T>
  8.     void operator()(T& t) const { std::cout << t << std::endl; }
  9. };
  10.  
  11. template<std::size_t I = 0, typename FuncT, typename... Tp>
  12. inline typename std::enable_if<I == sizeof...(Tp), void>::type
  13.   for_index(int, std::tuple<Tp...> &, FuncT)
  14.   { }
  15.  
  16. template<std::size_t I = 0, typename FuncT, typename... Tp>
  17. inline typename std::enable_if<I < sizeof...(Tp), void>::type
  18.   for_index(int index, std::tuple<Tp...>& t, FuncT f)
  19.   {
  20.     if (index == 0) f(std::get<I>(t));
  21.     for_index<I + 1, FuncT, Tp...>(index-1, t, f);
  22.   }
  23.  
  24.  int main() {
  25.  	 auto t = make_tuple(1, 2, "abc", "def", 4.0f);
  26.      int i = 2; // for example
  27.  	 for_index(i, t, Functor());
  28.      return 0;
  29.  }
Success #stdin #stdout 0s 3096KB
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stdin
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Standard input is empty
stdout
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abc
https://ideone.com/Z42aXV
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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