Reflection system and sub-macro

Development Programming & Scripting C++
1

Hey guys. Started messing up with abilities system and got an idea to define attributes with initter, getter, setter, delegate, etc. in one line. Like this:
Definition:



#define LAZY_ATTRIBUTE(ClassName, PropertyName, DispatcherSig) \
    UPROPERTY(BlueprintReadOnly, VisibleAnywhere, Category = "Cool") \
    FGameplayAttributeData PropertyName; \
    \
    GAMEPLAYATTRIBUTE_PROPERTY_GETTER(ClassName, PropertyName) \
    GAMEPLAYATTRIBUTE_VALUE_GETTER(PropertyName) \
    GAMEPLAYATTRIBUTE_VALUE_SETTER(PropertyName) \
    GAMEPLAYATTRIBUTE_VALUE_INITTER(PropertyName) \
    \
    UPROPERTY(VisibleAnywhere, BlueprintAssignable) \
    DispatcherSig On##PropertyName##Changed;

Use:



LAZY_ATTRIBUTE(UMyAttributeSet, Health2, FPropertyChanged)

Though it works perfectly in C++, it doesn’t expose UPROPERTies to blueprints. I believe it is because of reflection system doesn’t “see” those sub-macros. Is it possible to fix somehow except moving UPROPERTY out of the macro? Thanks in advance.

2

Correct, UHT will not parse those macros inside macros. There is nothing you can do about it unfortunately.

3

The problem is Epic’s compiler cannot identify “PropertyName”. You have to manually define it, cannot be a macro dynamic.

4

So sad. But thanks for reply!