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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. struct X
  32. {
  33. 	static const char* value;
  34. };
  35.  
  36. const char* X::value = "ABC";
  37.  
  38. int main()
  39. {
  40.     typedef void(*function_t)(int);
  41.     function_t ptrFunc = delegate<void, Class, int>::adapter<&Class::print, X>::invoke_no_fwd;
  42.     ptrFunc(-42); // 0
  43.  
  44.     return 0;
  45. }
  46.  
Success #stdin #stdout 0s 3344KB
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stdin
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Standard input is empty
stdout
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ABC
Class: -42
https://ideone.com/CLFk9L
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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