Is there a 4.22 C++ guide best practices somewhere?

[The-Cowboy]

Few things that may help:

1. In the .h files you usually don't need to have other header includes. If you're using other classes you can use 'class' in front to forward declare it.
Ex:

UPROPERTY() class AUTGameState* GameState;

That will compile fine, and will only need the header when used in the .cpp file, not in the .h file. This may clear up issues with things referencing each other in headers which is what it seems like that 'nested' error is.

But that occurs in the .cpp file.

3. Cached problems! Somethings things just don't work even though they should. Usually worth doing a full rebuild of the project, or deleting the intermediate folder, regenerating project files (right click the .uproject file) and rebuilding the game.
This could fix odd compiler/game errors that just don't make sense (possibly the spacing errors).

Maybe I wasn't clear enough. The error is detected by QT Creator as per the presence/absence of certain white spaces. That is weird and mysterious.

[The-Cowboy]

Could you be more specific about the glue part? For instance the Party.generated.h looks like
In other words, what new structure is provided by this file that cannot be achieved by traditional C++ compilation process (which don't involve .generated.h). On the local scale I understand that it supports the error spitting mechanism and all that, but what exactly does it stand for on global scale?

Just a sound reference for the utility of ".generated.h" files the way I wanted https://answers.unrealengine.com/que...ml?sort=oldest