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  1. #include <iostream>
  2. #include <functional>
  3. #include <vector>
  4.  
  5. template <typename T>
  6. class Event
  7. {
  8. public:
  9.     using func = std::function<void(T)>;
  10.  
  11.  
  12.     void Raise(T arg)
  13.     {
  14.         for (auto handler : _handlers)
  15.         {
  16.             handler(arg);
  17.         }        
  18.     }
  19.  
  20.     void operator ()(T arg)
  21.     {
  22.         Raise(arg);
  23.     }
  24.  
  25.     Event& operator += (func f)
  26.     {
  27.         _handlers.push_back(f);
  28.         return *this;
  29.     }
  30.  
  31.     Event& operator -= (func f)
  32.     {
  33.         for (auto handler : _handlers)
  34.         {
  35.  
  36.             if (handler.template target<void(T)>() == f.template target<void(T)>())
  37.             {
  38.                 _handlers.erase(handler);
  39.                 break;
  40.             }
  41.         }
  42.  
  43.         return *this;
  44.     }
  45.  
  46. private:
  47.     std::vector<func> _handlers;
  48. };
  49.  
  50. class SomeClass
  51. {
  52.  public:
  53.        Event<std::string> SomethingChanged;
  54. };
  55.  
  56. class Onemoreclass
  57. {
  58.      SomeClass _someClass{};
  59. public: 
  60.    Onemoreclass()
  61.   {
  62.   	  using namespace std::placeholders;
  63.       _someClass.SomethingChanged  += std::bind(&Onemoreclass::Print, this, _1);
  64.   }
  65.  
  66. private:
  67.     void Print(std::string message)   {std::cout << message << std::endl; }
  68. };
  69.  
  70. int main() {
  71. 	// your code goes here
  72. 	Onemoreclass one;
  73.  
  74. 	return 0;
  75. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/sB1t1p
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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