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  1. #include <iostream>
  2. #include <functional>
  3. #include <memory>
  4.  
  5. struct ACancelable {};
  6. struct ACancelableToken {};
  7.  
  8. template<typename T, typename U>
  9. class ANotifier : public ACancelable
  10. {
  11. public:
  12.   using NotificationFn = std::function<void(T&)>;
  13.   virtual std::weak_ptr<ACancelableToken> RegisterNotification( U msgType, NotificationFn fn ) = 0;
  14.   virtual void Notify( U msgType, T& value ) = 0;
  15. };
  16.  
  17. template<typename T, typename U>
  18. class ASingleNotifier : public ANotifier<T, U>
  19. {
  20.   using NotificationFn = typename ANotifier<T,U>::NotificationFn;
  21.   virtual std::weak_ptr<ACancelableToken> RegisterNotification( U msgType, NotificationFn fn );
  22. };
  23.  
  24. int main() {
  25. 	// your code goes here
  26. 	return 0;
  27. }
Success #stdin #stdout 0s 3408KB
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https://ideone.com/sXVkvw
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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