We've changed the way vtable ptr are obtained for UClasses. Right now we use special empty constructor to get it, so we don't have to use normal one which was causing troubles. This special vtable helper constructor is generated automatically for most cases, but sometimes it's not possible (e.g. no default constructor for members types). In such case there is a possibility to override that generated constructor and write a custom one. The signature is UCustomClass::UCustomClass(FVTableHelper& Helper) and it needs to call base class'es constructor with the same parameter. Please do not use these constructors for anything else. There is no guarantee the object will be in correct state after calling this.
You can still disable this functionality if something breaks, just set WITH_HOT_RELOAD_CTORS to 0.
[CL 2466152 by Jaroslaw Palczynski in Main branch]
In order to use new feature user have to change GENERATED_UCLASS_BODY() macro to the new GENERATED_BODY(). Then no constructor is implicitly declared. If there is no constructor declared in UCLASS then PCIP one is declared and defined that passes PCIP down to super-class. On the other hand if there is a constructor declared then UObject system expects to have one of the default or PCIP constructor to initialize a class during loading from disk, default object creation, etc. and it expects that user will declare and define one.
There is a possibility now to create UCLASS with the default constructor (i.e. no PCIP).
New macro is encouraged by standard classes and in-editor wizards templates.
#codereview Robert.Manuszewski
[CL 2325282 by Jaroslaw Palczynski in Main branch]
- Added links to actual source files. Lots of times intellisense/VA will take you to the less helpful skeleton file rather than the actual source file.
[CL 2313538 by Zak Middleton in Main branch]
https://github.com/EpicGames/UnrealEngine/pull/467
- did not expose FGuid fields in BPs
- removed ZeroedGuid() because NewGuid() is already zeroed
- made the string conversion function match ToString() behavior
- cosmetic changes
[CL 2311319 by Max Preussner in Main branch]
