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  1. #include <iostream>
  2. #include <utility>
  3.  
  4. struct pseudo_void {};
  5.  
  6. template <typename T>
  7. struct N;
  8.  
  9. template <typename T>
  10. struct N<T()> {
  11.     T operator()(T(&t)()) {
  12.         return t();
  13.     }
  14. };
  15.  
  16. template <typename T, typename ... F>
  17. struct N<T(F...)> {
  18.     T operator()(T (&t)(F...), F &&... f) {
  19.         return t(std::forward<F>(f)...);
  20.     }
  21. };
  22.  
  23. template <typename ...F>
  24. struct N<void(F...)> {
  25.     pseudo_void operator()(void (& t)(F...), F &&... f) {
  26.         t(std::forward<F>(f)...);
  27.         return pseudo_void();
  28.     }
  29. };
  30.  
  31. template <>
  32. struct N<void()> {
  33.     pseudo_void operator()(void (& t)()) {
  34.         t();
  35.         return pseudo_void();
  36.     }
  37. };
  38.  
  39. std::ostream & operator<< (std::ostream & os, const pseudo_void &) {
  40.     return os;
  41. }
  42.  
  43. void f(int) {}
  44.  
  45. int main() {
  46.  
  47.     N<void(int)> n;
  48.  
  49.     n(f, 4);
  50.  
  51. }
Success #stdin #stdout 0s 2924KB
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https://ideone.com/6I25xr
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
secret

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