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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. struct Listener {
  6.   virtual void callback() = 0;
  7. };
  8.  
  9. struct Listener1 : public Listener{
  10.   void callback() override {
  11.   	cout << "listener1" << endl;
  12.   }
  13. };
  14.  
  15. struct Processor {
  16.   vector<Listener*> listeners;
  17.  
  18.   void notify() {
  19.     for(auto &listener : listeners) {
  20.     	listener->callback();
  21.     }
  22.   }
  23. };
  24.  
  25. int main() {
  26. 	Listener1 listener1;
  27.  
  28. 	Processor processor;
  29.  
  30. 	processor.listeners.push_back(&listener1);
  31.  
  32. 	processor.notify();
  33.  
  34. 	return 0;
  35. }
Success #stdin #stdout 0s 3228KB
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Standard input is empty
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listener1
https://ideone.com/lTGAgE
observer
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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