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  1. #include <iostream>
  2. #include <cstring>
  3.  
  4. template<typename ReturnType, typename... ParameterTypes>
  5. class FDelegate
  6. {
  7. 	class FDelegateDummyClass;
  8.  
  9. 	using MethodType = ReturnType (FDelegateDummyClass::*)(ParameterTypes...);
  10.  
  11. 	MethodType BoundMethod;
  12.  
  13. public:
  14.  
  15. 	FDelegate()
  16. 		: BoundMethod(nullptr)
  17. 	{
  18. 	}
  19.  
  20. 	template<typename ClassName>
  21. 	void Bind(ReturnType (ClassName::*Method)(ParameterTypes...))
  22. 	{
  23. 		BoundMethod = (MethodType&)(Method);
  24. 	}
  25.  
  26. 	void Unbind()
  27. 	{
  28. 		BoundMethod = nullptr;
  29. 	}
  30.  
  31. 	bool IsBound() const
  32. 	{
  33. 		return BoundMethod != nullptr;
  34. 	}
  35.  
  36. 	template<typename ObjectType>
  37. 	ReturnType Execute(ObjectType* Object, ParameterTypes... Parameters)
  38. 	{
  39. 		return ((FDelegateDummyClass*)Object->*BoundMethod)(Parameters...);
  40. 	}
  41.  
  42. 	template<typename ObjectType>
  43. 	ReturnType ExecuteIfBound(ObjectType* Object, ParameterTypes... Parameters)
  44. 	{
  45. 		if (IsBound())
  46. 		{
  47. 			return Execute<ObjectType>(Object, Parameters...);
  48. 		}
  49. 	}
  50. };
  51.  
  52. class FSampleBase
  53. {
  54. protected:
  55.  
  56. 	FDelegate<void, int> NotifyFooInvoked;
  57.  
  58. public:
  59.  
  60. 	void Foo(int Value)
  61. 	{
  62. 		NotifyFooInvoked.ExecuteIfBound(this, Value);
  63. 	}
  64. };
  65.  
  66. class FSampleDerived : public FSampleBase
  67. {
  68. 	int SampleData;
  69.  
  70. public:
  71.  
  72. 	FSampleDerived(int Data)
  73. 		: SampleData(Data)
  74. 	{
  75. 		NotifyFooInvoked.Bind(&FSampleDerived::OnFooInvoked);
  76. 	}
  77.  
  78. 	void OnFooInvoked(int Value)
  79. 	{
  80. 		std::cout << "Foo Invoked: " << Value << " [Sample Data: " << SampleData << "]" << std::endl;
  81. 	}
  82. };
  83.  
  84. int main()
  85. {
  86. 	FSampleDerived FirstSample(11);
  87. 	FSampleDerived* SecondSample = (FSampleDerived*)std::malloc(sizeof(FSampleDerived));
  88.  
  89. 	std::memcpy(SecondSample, &FirstSample, sizeof(FSampleDerived));
  90.  
  91. 	FirstSample.Foo(1);
  92. 	SecondSample->Foo(2);
  93.  
  94. 	std::free(SecondSample);
  95.  
  96. 	return 0;
  97. }
Success #stdin #stdout 0s 4344KB
comments (?)
stdin 
Standard input is empty
stdout 
Foo Invoked: 1 [Sample Data: 11]
Foo Invoked: 2 [Sample Data: 11]
https://ideone.com/UxkUPv
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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