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  1. #include <functional>
  2. #include <iostream>
  3.  
  4. template <typename VAL, typename RET, typename ...ARGS>
  5. struct wrapper_helper
  6. {
  7.  static std::function<RET(ARGS...)> wrapper(VAL v)
  8.  {
  9.    return [&](ARGS...args) -> RET { return v(args...); };
  10.  }
  11. };
  12.  
  13. template <typename VAL, typename ...ARGS> 
  14. struct wrapper_helper<VAL,void,ARGS...>
  15. {
  16.  static std::function<void(ARGS...)> wrapper(VAL v)
  17.  {
  18.    return [&](ARGS...args) -> void { v(args...); };
  19.  }
  20. };
  21.  
  22. void print_n(int n){
  23. 	std::cout << n << std::endl;
  24. }
  25.  
  26. int main()
  27. {	
  28. 	wrapper_helper<void(int),void,int>::wrapper(print_n)(10);
  29. 	return 0;
  30. }
Success #stdin #stdout 0s 15240KB
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Standard input is empty
stdout
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10
https://ideone.com/WNdrrB
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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