Unreal C++/Blueprint

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UCLASS( ClassGroup=(Custom), meta=(BlueprintSpawnableComponent) )
class PLUGIN_API UMyClass: public UActorComponent
{

GENERATED_BODY()
// use dynamic multicast, more option here
     DECLARE_DYNAMIC_MULTICAST_DELEGATE(FOnCustomDispatch);

public:
UPROPERTY(BlueprintAssignable)
FOnCustomDispatch OnCustomDispatch ;

}
[...]
OnCustomDispatch.Broadcast();