Macro Expansion Help

anonymous_user_b55a8b40 · September 16, 2019, 1:20pm

Hello could anyone tell me where to find what the macros in ObjectMacros.h “actually” expand to. For example GENERATED_BODY(…) and UCLASS(…) inside of a Actor class expand to something. I know they are variadic macros, but the #define in the ObjectMacros.h source I’m seeing just refers to more macros. What do these macros GENERATED_BODY(…) and UCLASS(…) actually expand to when parsed by the preprocessor(s) inside of an Actor class?

Also, I have access to the source on Github but I cannot find the implementation of the UnrealHeaderTool (UHT). Is the UHT implementation on github?

Thanks

BrUnO_XaVIeR · September 16, 2019, 1:34pm

The header tool generates code that you will find in YourClassHeader.generated.h files.
This is why YourClassHeader.generated.h header must be always the last include as well.

anonymous_user_b55a8b40 · September 16, 2019, 3:12pm

Thanks and I found the UHT implementation under Engine\Source\Programs\UnrealHeaderTool