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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class Foo{
  5. 	public:
  6. 	void bar(){
  7. 		cout << "Foo called\n";
  8. 	}
  9. };
  10.  
  11.  
  12. class Foo2{
  13. 	public:
  14. 	void bar2(){
  15. 		cout << "Foo2 called\n";
  16. 	}
  17. };
  18.  
  19. class Function{
  20. 	public:
  21.     virtual void call()=0;
  22. };
  23.  
  24.  
  25. template<typename T>
  26. class TemplatedFunction : public Function{
  27. 	public:
  28. 	void (T::*m_fkt)();
  29. 	T* m_obj;
  30.  
  31.     TemplatedFunction(T* obj, void (T::*fkt)()):m_fkt(fkt),m_obj(obj){}
  32.  
  33.     void call(){
  34.       (m_obj->*m_fkt)();
  35.     }
  36. };
  37.  
  38. class EventHandler{
  39. 	public:
  40. 	Function* m_func=nullptr;
  41.  
  42. 	template<class T> 
  43. 	void SetCallbackFunction(T* obj, void (T::*mem_fkt)()){
  44. 		if(m_func != nullptr)
  45. 			delete m_func;
  46. 		m_func = new TemplatedFunction<T>(obj,mem_fkt);
  47. 	}
  48.  
  49. 	void TestCallback(){
  50. 		if(m_func != nullptr)
  51. 			m_func->call();
  52. 	}
  53.  
  54. 	~EventHandler(){
  55. 		if(m_func != nullptr)
  56. 			delete m_func;
  57. 	}
  58. };
  59.  
  60. int main() {
  61. 	EventHandler eh;
  62. 	Foo foo;
  63. 	Foo2 foo2;
  64. 	eh.SetCallbackFunction(&foo, &Foo::bar);
  65. 	eh.TestCallback();
  66. 	eh.SetCallbackFunction(&foo2, &Foo2::bar2);
  67. 	eh.TestCallback();
  68. 	return 0;
  69. }
Success #stdin #stdout 0s 3456KB
comments (?)
stdin 
Standard input is empty
stdout 
Foo called
Foo2 called
https://ideone.com/3Hu5pw
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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