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  1. #include <iostream>
  2.  
  3. enum COMMANDS {
  4.     CMD_ZERO,
  5.     CMD_ONE,
  6.     CMD_TWO,
  7. };
  8.  
  9. template <COMMANDS cmd> struct command
  10. {
  11.     template <typename ... Args>
  12.     int operator() (Args&&...) const { return -1; }
  13. };
  14.  
  15. template <> struct command<CMD_ZERO>
  16. {
  17.     int operator()(double a, double b, double c) const
  18.     {
  19.         std::cout << "cmd0  " << a << ", " << b << ", " << c << std::endl;
  20.         return 0;
  21.     }
  22. };
  23.  
  24. template <> struct command<CMD_ONE>
  25. {
  26.     int operator()(int a, int b, int c) const
  27.     {
  28.         std::cout << "cmd1  " << a << ", " << b << ", " << c << std::endl;
  29.         return 1;
  30.     }
  31. };
  32.  
  33. template <COMMANDS cmd, typename... Args> int DispatchCommand(Args&&... args)
  34. {
  35.     return command<cmd>()(std::forward<Args>(args)...);
  36. }
  37.  
  38. int main()
  39. {
  40.     DispatchCommand<CMD_ZERO>(1, 3.141, 4);
  41.     DispatchCommand<CMD_ONE>(5, 6, 7);
  42.     DispatchCommand<CMD_TWO>(5, 6, 7, 8, 9);
  43.     return 0;
  44. }
  45.  
Success #stdin #stdout 0s 3340KB
comments (?)
stdin 
Standard input is empty
stdout 
cmd0  1, 3.141, 4
cmd1  5, 6, 7
https://ideone.com/eQsnLS
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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