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  1. #include <stdio.h>
  2.  
  3. class duck{
  4. public:
  5. 	template <typename Quacker>
  6. 	void quack(const Quacker & q){
  7. 		quack_the_duck(*this, q);
  8. 	}
  9. 	void quack_happily(){
  10. 		printf("quack :)");
  11. 	}
  12. 	void quack_sadly(){
  13. 		printf("quack :(");
  14. 	}
  15. 	void quack_confusedly(){
  16. 		printf("quack ??");
  17. 	}
  18. };
  19.  
  20. template <typename Quacker>
  21. void quack_the_duck(duck & d, const Quacker & q){
  22. 	d.quack_confusedly();
  23. }
  24.  
  25. class a_quacker{
  26. public:
  27. };
  28.  
  29. void quack_the_duck(duck & d, const a_quacker & q){
  30. 	d.quack_happily();
  31. }
  32.  
  33. int main(){
  34. 	duck d;
  35. 	a_quacker cracker;
  36. 	d.quack(cracker);
  37. 	return 0;
  38. }
  39.  
Success #stdin #stdout 0s 3340KB
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Standard input is empty
stdout
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quack :)
https://ideone.com/3VcN45
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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