Calling functions implemented by C++in the blueprint and the usage of UFUNCATION

Development Programming & Scripting C++
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20240929160354
May I ask what this symbol on the blueprint means? How should I add this symbol to a function I want to write in C++.

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it means its latent and cannot be used inside functions

to create your own you could use a custom K2Node or AsyncActionBase

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A third option is to include an FLatentActionInfo LatentInfo param and use the LatentInfo=“LatentInfo” UFUNCTION markup.