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C++ Decorator for AI Behavior Tree doesn't work

Hi, Epic Community, I recently tried to implement a Decorator for my AI Behavior Tree using C++, so I started at the very simple step, which was to check if the Decorator first by printing out a message onto the screen. However, it didn't work. Here are the screenshots about my work. Can anyone share some tutorials about C++ AI Behavior Tree Decorator please? Thank you very much for your help.

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Product Version: UE 4.21
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asked Apr 14 '19 at 05:24 PM in C++ Programming

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