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  1. #include <iostream>
  2. #include <string>
  3. #include <vector>
  4. #include <queue>
  5. #include <memory>
  6.  
  7. class Event
  8. {
  9. public:
  10.     typedef std::shared_ptr<Event> Pointer;
  11.     int id;
  12.     Event() : id(0) {}
  13.  
  14.     virtual std::shared_ptr<Event> getSharedPointer()
  15.     {
  16.         return std::shared_ptr<Event>(this);
  17.     }
  18. };
  19.  
  20. class ParameterChangedEvent : public Event
  21. {
  22. public:
  23.     typedef std::shared_ptr<ParameterChangedEvent> Pointer;
  24.     int id;
  25.     std::string device;
  26.     ParameterChangedEvent() : id(1), device("M1") {}
  27.  
  28.     virtual std::shared_ptr<Event> getSharedPointer()
  29.     {
  30.         return std::make_shared<ParameterChangedEvent>(*this);
  31.     }
  32. };
  33.  
  34. class YetAnotherEvent : public Event
  35. {
  36. public:
  37.     typedef std::shared_ptr<YetAnotherEvent> Pointer;
  38.     int id;
  39.     YetAnotherEvent() : id(3) {}
  40.  
  41.     virtual std::shared_ptr<Event> getSharedPointer()
  42.     {
  43.         return std::make_shared<YetAnotherEvent>(*this);
  44.     }
  45. };
  46.  
  47. typedef std::function<void (Event::Pointer)> EventListener;
  48. std::queue<Event::Pointer> events;
  49. std::vector<EventListener> listeners;
  50.  
  51. void enqueue(Event & event)
  52. {
  53.     events.push(event.getSharedPointer());
  54. }
  55.  
  56. void producer1()
  57. {
  58.     ParameterChangedEvent event;
  59.     enqueue(event);
  60. }
  61.  
  62. void producer2()
  63. {
  64.     YetAnotherEvent event;
  65.     enqueue(event);
  66. }
  67.  
  68. void dispatch()
  69. {
  70.     while (!events.empty()) {
  71.         auto event = events.front();
  72.         for (auto listener: listeners) {
  73.             listener(event);
  74.         }
  75.         events.pop();
  76.     }
  77. }
  78.  
  79. void listener1(Event::Pointer event)
  80. {
  81.     ParameterChangedEvent::Pointer event2 = std::dynamic_pointer_cast<ParameterChangedEvent>(event);
  82.     if (event2 == nullptr) {
  83.         return;
  84.     }
  85.     std::cout << "Listener 1 [Event.id:" << event2->id << "], device: " << event2->device << std::endl;
  86. }
  87.  
  88. void listener2(Event::Pointer event)
  89. {
  90.     YetAnotherEvent::Pointer event2 = std::dynamic_pointer_cast<YetAnotherEvent>(event);
  91.     if (event2 == nullptr) {
  92.         return;
  93.     }
  94.     std::cout << "Listener 2 [Event.id:" << event2->id << "], id: " << event2->id << std::endl;
  95. }
  96.  
  97. int main()
  98. {
  99.     listeners.push_back(EventListener(listener1));
  100.     listeners.push_back(EventListener(listener2));
  101.  
  102.     producer1();
  103.     producer1();
  104.     producer2();
  105.     producer1();
  106.     producer2();
  107.     producer2();
  108.  
  109.     dispatch();
  110.  
  111.     return 0;
  112. }
  113.  
Success #stdin #stdout 0s 3488KB
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stdin
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Standard input is empty
stdout
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Listener 1 [Event.id:1], device: M1
Listener 1 [Event.id:1], device: M1
Listener 2 [Event.id:3], id: 3
Listener 1 [Event.id:1], device: M1
Listener 2 [Event.id:3], id: 3
Listener 2 [Event.id:3], id: 3
https://ideone.com/X75trz
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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