How do I create a Custom Event in C++?

As you read the error function code already is decelered in UHT generated code. Accoring to this:

https://docs.unrealengine.com/latest/INT/Programming/UnrealArchitecture/Reference/Functions/Specifiers/BlueprintNativeEvent/index.html

If you want to create override for event in C++ you need to create funcfion called TakeDmg_Implementation(int32 dmg) in cpp

If you want to create event only used in blueprint and triggered from C++ uss BlueprintImplementableEvent insted

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