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  1. #include <tuple>
  2. #include <utility>
  3.  
  4. namespace detail
  5. {
  6.     template<int... Is>
  7.     struct seq { };
  8.  
  9.     template<int N, int... Is>
  10.     struct gen_seq : gen_seq<N - 1, N - 1, Is...> { };
  11.  
  12.     template<int... Is>
  13.     struct gen_seq<0, Is...> : seq<Is...> { };
  14.  
  15.     template<typename F, typename... Ts, int... Is>
  16.     void call_with_tuple(F&& f, std::tuple<Ts...> const& t, seq<Is...>)
  17.     {
  18.         (std::forward<F>(f))(std::get<Is>(t)...);
  19.     }
  20. }
  21.  
  22. template<typename F, typename... Ts>
  23. void call_with_tuple(F&& f, std::tuple<Ts...> const& t)
  24. {
  25.     detail::call_with_tuple(std::forward<F>(f), t, detail::gen_seq<sizeof...(Ts)>());
  26. }
  27.  
  28. #include <iostream>
  29. #include <functional>
  30.  
  31. template< typename ... Args >
  32. class Message {
  33. public:
  34.     Message( Args&& ... args ) {
  35.         mArgs = std::make_tuple( args ...  );
  36.     }
  37.  
  38.     std::tuple< Args ... > mArgs;
  39.     typedef std::function< void ( Args ... ) > HandlerType;
  40.  
  41.     void Consume( HandlerType handler ) {
  42.         call_with_tuple(handler, mArgs);
  43.     }
  44. };
  45.  
  46.  
  47. int main()
  48. {
  49.     // Testing code
  50.     Message<int, int> msg(1, 2);
  51.  
  52.     msg.Consume( [] ( int i, int j ) {
  53.         std::cout << i << ',' << j << '\n';
  54.     });
  55. }
  56.  
Success #stdin #stdout 0s 2984KB
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https://ideone.com/fV4J13
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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