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  1. #include <iostream>
  2. #include <forward_list>
  3. using namespace std;
  4.  
  5. class EventResizeEventListener
  6. {
  7. public:
  8. 	virtual ~EventResizeEventListener() = default;
  9. 	virtual void Resize(uint32_t w, uint32_t h) = 0;
  10. };
  11.  
  12. template<typename T, typename ... Args>
  13. class EventSignal
  14. {
  15. 	typedef void(T::*Func)(Args ...);
  16. 	struct listData
  17. 	{
  18. 		void operator()(Args ...args) { (listener->*func)(args ...); }
  19.  
  20. 		T *listener = nullptr;
  21. 		Func func;
  22. 		bool active = false;
  23. 	};
  24.  
  25. public:
  26.  
  27. 	void Connect(T *listener, void(T::*f)(Args ...))
  28. 	{
  29. 		// todo: register id
  30. 		listData data = { listener, f, true };
  31. 		m_lists.emplace_front(data);
  32. 	}
  33.  
  34. 	void operator()(Args ...args) noexcept
  35. 	{
  36. 		for (auto &i : m_lists)
  37. 		{
  38. 			if (i.active)
  39. 			{
  40. 				i(args...);
  41. 			}
  42. 			else
  43. 				;// todo: remove
  44. 		}
  45. 	}
  46.  
  47. private:
  48. 	std::forward_list<listData> m_lists;
  49. };
  50.  
  51.  
  52. // кастомный класс
  53. class FooBla : public EventResizeEventListener
  54. {
  55. public:
  56. 	void Resize(uint32_t w, uint32_t h) final
  57. 	{
  58. 		std::cout << w << " " << h << std::endl;
  59. 	}
  60. };
  61.  
  62.  
  63. int main() {
  64. 	FooBla fff;
  65.  
  66. 	// класс оповещения
  67. 	EventSignal<EventResizeEventListener, uint32_t, uint32_t> siga;
  68.  
  69. 	// регистрация слушателя
  70. 	siga.Connect(&fff, &EventResizeEventListener::Resize);
  71.  
  72. 	// оповещение
  73. 	siga(10, 20);
  74.  
  75. 	return 0;
  76. }
Success #stdin #stdout 0s 4492KB
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10 20
https://ideone.com/Pz9lwn
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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