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  1. #include <iostream>
  2. #include <type_traits>
  3.  
  4. template< typename R, typename C, typename... Args>
  5. class delegate
  6. {
  7. public:
  8.     template<R(C::*F)(Args...), typename ... Ts>
  9.     struct adapter
  10.     {
  11.         static R invoke_no_fwd(Args... args)
  12.         {
  13.             C t((Ts::value)...);
  14.             return (t.*F)(args...);
  15.         }
  16.     };
  17. };
  18.  
  19. class Class
  20. {
  21. public:
  22.     Class(const char* psz) {
  23.         std::cout << psz << std::endl;
  24.     }
  25.     void print(int v)
  26.     {
  27.         std::cout << "Class: " << v << std::endl;
  28.     }
  29. };
  30.  
  31. template <char... Chars>
  32. struct MyString
  33. {
  34. 	static constexpr char value[] = { Chars..., '\0' };
  35. };
  36.  
  37. template <char... Chars>
  38. constexpr char MyString<Chars...>::value[];
  39.  
  40. int main()
  41. {
  42.     typedef void(*function_t)(int);
  43.     function_t ptrFunc = delegate<void, Class, int>::adapter<&Class::print, MyString<'A', 'B', 'C'>>::invoke_no_fwd;
  44.     ptrFunc(-42); // 0
  45.  
  46.     return 0;
  47. }
  48.  
Success #stdin #stdout 0s 3344KB
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ABC
Class: -42
https://ideone.com/8uhwi1
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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