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  1. #include <iostream>
  2. #include <string>
  3.  
  4. struct EmptyType {  };
  5.  
  6. template<class  arg1=EmptyType, class arg2=EmptyType, class arg3=EmptyType>
  7. class my_class
  8. { public:
  9. 	my_class(){
  10. 		std::cout << 3 << std::endl;
  11. 	}
  12.     // FILL_MY_CLASS_DEFINE(3)
  13. };
  14. template<class  arg1, class arg2>
  15. class my_class<arg1,arg2,EmptyType>
  16. { public:
  17. 	my_class(){
  18. 		std::cout << 2 << std::endl;
  19. 	}
  20.     // FILL_MY_CLASS_DEFINE(2)
  21. };
  22. template<class  arg1>
  23. class my_class<arg1,EmptyType,EmptyType>
  24. {  public:
  25. 	my_class(){
  26. 		std::cout << 1 << std::endl;
  27. 	}
  28.     // FILL_MY_CLASS_DEFINE(1)
  29. };
  30.  
  31. int main(int argc, const char *argv[])
  32. {
  33.  //   my_class<std::string, double, int> a;
  34.     my_class<std::string, int> b;
  35.     my_class<void> c;
  36.     my_class<> d;
  37.  
  38.     return 0;
  39. }
Success #stdin #stdout 0s 2724KB
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https://ideone.com/PjAwC
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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