I am implementing logging functionality in Unreal Engine 4.27 (in C ). A key part of my code is a function that is called once per game-tick. This function is responsible for iterating over an array of actors that I would like to log data for, checking whether a new log entry should be written at this point in time and calling the necessary functions to do that.

I am iterating over elements of a TArray of UStructs: LogObject->LoggingInfo = TArray<FActorLoggingInformation>. This array is defined as a UProperty of LogObject. In the loop I have to change the values of the elements so I want to work with the original items and "label" the current item as "ActorLoggingInfo". I have seen this done

Additional Notes:

1. Something that consistently works for me is omitting the &, using:

for (FActorLoggingInformation ActorLoggingInfo : LogObject->LoggingInfo)

However, this is creating useless duplicates on a per-tick basis and complicates applying changes to the original objects from within in the for-loop, so it is not a viable option.

2. I have also tried auto& instead of FActorLoggingInformation& as used in the examples above, but I encountered the same issue, so I thought it would be best to be as explicit as possible.

I would be very thankful if you had any ideas how I can fix this :) Thanks in advance!

CodePudding user response：

Thanks to Avi Berger for helping me find my problem! In fact, ActorLoggingInfo was actually never undefined and the code within the body of the if-clause was also executed (it just didn't do what it was intended to do).

When stepping through the code in the debugger it never showed the steps within the if-body and ActorLoggingInfo was shown as undefined so when no logs were written, I assumed it was something to do with that instead of my output function not working properly. So lesson learnt, do not blindly trust the debugger :)