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  1. #include <iostream>
  2. #include <string>
  3.  
  4. class Event
  5. {
  6. protected:
  7.   Event(std::string const& name)
  8.     : name(name)
  9.   {}
  10. public:
  11.   virtual
  12.   ~Event() = default;
  13.  
  14. public:
  15.   std::string name;
  16. };
  17.  
  18. class Actor;
  19.  
  20. class ActorEvent
  21.   : public Event
  22. {
  23. protected:
  24.   ActorEvent(std::string const& name,
  25.              Actor* actor)
  26.     : Event(name)
  27.     , actor(actor)
  28.   {}
  29.  
  30. public:
  31.   virtual
  32.   ~ActorEvent() = default;
  33.  
  34. public:
  35.   Actor* actor;
  36. };
  37.  
  38. class ActorCreated
  39.   : public ActorEvent
  40. {
  41. public:
  42.   ActorCreated(Actor* actor)
  43.     : ActorEvent("ActorCreated", actor)
  44.   {}
  45.   virtual
  46.   ~ActorCreated() = default;
  47. };
  48.  
  49. class ActorDeleted
  50.   : public ActorEvent
  51. {
  52. public:
  53.   ActorDeleted(Actor* actor)
  54.     : ActorEvent("ActorDeleted", actor)
  55.   {}
  56.   virtual
  57.   ~ActorDeleted() = default;
  58. };
  59.  
  60. class EventManager
  61. {
  62. public:
  63.   void
  64.   process(ActorCreated const& event)
  65.   {
  66.     std::cerr << "actor created (" << std::hex << event.actor << ")" << std::endl;
  67.   }
  68.  
  69.   void
  70.   process(ActorDeleted const& event)
  71.   {
  72.     std::cerr << "actor deleted (" << std::hex << event.actor << ")" << std::endl;
  73.   }
  74. };
  75.  
  76. EventManager e;
  77.  
  78. class Actor
  79. {
  80. public:
  81.   Actor()
  82.   {
  83.     e.process(ActorCreated(this));
  84.   }
  85.  
  86.   ~Actor()
  87.   {
  88.     e.process(ActorDeleted(this));
  89.   }
  90. };
  91.  
  92. int main()
  93. {
  94.   std::cerr << "hello" << std::endl;
  95.   {
  96.     Actor a;
  97.   }
  98.   std::cerr << "good bye" << std::endl;
  99. }
  100.  
Success #stdin #stdout #stderr 0.01s 3476KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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hello
actor created (0xbfb0d10f)
actor deleted (0xbfb0d10f)
good bye
https://ideone.com/FiKK5E
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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