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  1. #include <iostream>
  2. #include <functional>
  3. #include <vector>
  4.  
  5. template<typename Sig>
  6. class EventDispatcher
  7. {
  8. public:
  9.     using Event = std::function<Sig>;
  10.  
  11.     template<typename... Args>
  12.     void Invoke(Args&& ...Params)
  13.     {
  14.         for (auto&& event : m_Events)
  15.         {
  16.             event(std::forward<Args>(Params)...);
  17.         }
  18.     }
  19.  
  20.     void operator+=(const Event& event)
  21.     {
  22.         m_Events.emplace_back(event);
  23.     }
  24.  
  25. private:
  26.     std::vector<Event> m_Events;
  27. };
  28.  
  29. class Base
  30. {
  31. public:
  32.     using eCallbacks = EventDispatcher<void(Base*)>;
  33.  
  34.     eCallbacks& RenderEvent() { return m_eRenderEvent; };
  35.  
  36.     void Invoke() { m_eRenderEvent.Invoke(this);}
  37.  
  38. private:
  39.     eCallbacks m_eRenderEvent;
  40. };
  41.  
  42.  
  43. void Event1(Base*)
  44. {
  45.     std::cout << "Event1\n";
  46. }
  47.  
  48. void Event2(Base*, int value)
  49. {
  50.     std::cout << "Event2(" << value << ")\n";
  51. }
  52.  
  53. int main() {
  54.  
  55.     Base base;
  56.  
  57.     int IntToPass = 12345;
  58.  
  59.     base.RenderEvent() += Event1;
  60.     base.RenderEvent() += [=](Base* arg ) { Event2(arg, IntToPass);};
  61.  
  62.  
  63.     base.Invoke();
  64. }
  65.  
Success #stdin #stdout 0s 3460KB
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Standard input is empty
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Event1
Event2(12345)
https://ideone.com/LM7I2O
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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