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  1. #include <tuple>
  2. #include <utility> 
  3.  
  4. template<std::size_t I = 0, typename FuncT, typename... Tp>
  5. inline typename std::enable_if<I == sizeof...(Tp), void>::type
  6.   for_each(std::tuple<Tp...> &, FuncT) // Unused arguments are given no names.
  7.   { }
  8.  
  9. template<std::size_t I = 0, typename FuncT, typename... Tp>
  10. inline typename std::enable_if<I < sizeof...(Tp), void>::type
  11.   for_each(std::tuple<Tp...>& t, FuncT f)
  12.   {
  13.     f(std::get<I>(t));
  14.     for_each<I + 1, FuncT, Tp...>(t, f);
  15.   }
  16.  
  17. struct Window{
  18.     void show(){}
  19.     //stuff
  20. }w1, w2, w3;
  21.  
  22. struct Widget{
  23.     void show(){}
  24.     //stuff
  25. }w4, w5, w6;
  26.  
  27. struct Toolbar{
  28.     void show(){}
  29.     //stuff
  30. }t1, t2, t3;
  31.  
  32. int main() {
  33. 	auto t = std::make_tuple(w3, w4, w5, t1);
  34. 	for_each(t, [](auto &obj){
  35. 		obj.show();
  36. 	});
  37. }
  38.  
Success #stdin #stdout 0s 3452KB
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https://ideone.com/pRuKxx
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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