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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. void HelloWorld1(string var1, const char* var2)
  5. {
  6.     cout << var1 << " " << var2 << endl;
  7. }
  8.  
  9. int HelloWorld2(string var1, const char* var2)
  10. {
  11.     cout << var1 << " " << var2 << endl;
  12.     return 5;
  13. }
  14.  
  15. template<typename Fn, typename... Args>
  16. auto CallFunction(Fn fn, Args&&... args) -> typename enable_if<is_same<void, decay_t<decltype(fn(forward<Args>(args)...))>>::value, decltype(fn(forward<Args>(args)...))>::type
  17. {
  18.     fn(forward<Args>(args)...);
  19. }
  20.  
  21. template<typename Fn, typename... Args>
  22. auto CallFunction(Fn fn, Args&&... args) -> typename enable_if<!is_same<void, decay_t<decltype(fn(forward<Args>(args)...))>>::value, decltype(fn(forward<Args>(args)...))>::type
  23. {
  24.     return fn(forward<Args>(args)...);
  25. }
  26.  
  27. int main()
  28. {
  29. 	CallFunction(HelloWorld1, "Hello", "World 1!");
  30. 	CallFunction(HelloWorld2, "Hello", "World 2!");
  31.  
  32. 	// your code goes here
  33. 	return 0;
  34. }
Success #stdin #stdout 0s 3416KB
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stdin
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Standard input is empty
stdout
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Hello World 1!
Hello World 2!
https://ideone.com/El3WUi
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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