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  1. #include <functional>
  2. #include <iostream>
  3.  
  4. template <typename...Args>
  5. class Dispatcher {
  6.     typedef typename std::function<void(Args...)> Fn;
  7.  
  8.     public:
  9.         Dispatcher(Fn f) : m_function(std::move(f)) {}
  10.  
  11.         void operator()(Args...args) {
  12.           m_function(std::forward<Args>(args)...);
  13.         }
  14.  
  15.     private:
  16.         Fn m_function;
  17. };
  18.  
  19. template <typename C, size_t N, typename...Args>
  20. struct NaryDispatch_ {
  21.   using type = typename NaryDispatch_<C, N-1, Args..., C&>::type;
  22. };
  23. template <typename C, typename...Args>
  24. struct NaryDispatch_<C, 0, Args...> {
  25.   using type = Dispatcher<Args...>;
  26. };
  27.  
  28. template <typename C, size_t N>
  29. using NaryDispatch = typename NaryDispatch_<C, N>::type;
  30.  
  31.  
  32. int main() {
  33.   NaryDispatch<const int, 3> f{[](const int& a, const int& b, const int& c){
  34.     std::cout << a << ' ' << b << ' ' << c << '\n';
  35.   }};
  36.   f(42, 13, 11);
  37. }
  38.  
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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42 13 11
https://ideone.com/Vzy7m1
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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