Unrealeengine4 - about uobject's giant pit that is automatically GC garbage collected

1 What happened
A static inheritance is created in a plug-in UObject The object of

static UMyObject* m_Object = nullptr;
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Then it is initialized in the blueprint function of the plug-in :

m_Object = NewObject<UMyObject>();
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After some time, it is found that this object is destructed , Lead to wild pointer , Cause program crash ！

This NIMA is a static object pointer ！

2 UE4 Yes UObject Automatic destructor mechanism of
UE4 Yes UObject The object is not like C++,UE4 Will be in UObject Automatically reclaim an object when it has no reference .（ So smart , Intelligent makes people's scalp numb ）

and C++ If the object is dynamically created, it will always exist in the declaration cycle of the program , If you don't actively destruct , Will cause memory leaks .

On the bright side UE4 This mechanism for preventing memory leaks is perfect , But for those who have just come into contact UE4 For the novice , expected sth. to happen UE4 Adopted C++, But the mechanism is really so different , It is easy to cause the problem of wild pointer .

3 keep UObject Objects are not automatically destructed
If in the ordinary C++ There is one in the class UObject* A Variable , After creating this variable , Best use AddToRoot, In this way, it will not be UE4 Automatically GC, Then in the destructor , Use RemoveFromRoot Can automatically make UE4GC, Prevent memory leaks .
UMyObject* m_Object = NewObject<UMyObject>();
m_Object->AddToRoot();
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And then in C++ Class destructor :

m_Object->RemoveFromRoot();
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If you are inheriting UObject There is one in the class UObject* A Variable , Then you can use UPROPERTY Macro mark this variable , Then this variable will not be UE4 Automatically GC, When the class is destroyed , Variable A Will be set to null, After that UE4 Automatically GC.
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