Calling wrong overload of function

Development Programming & Scripting
1

I’m pretty sure that this isn’t supposed to happen at all, but I was able to declare multiple UFunctions in a class with the same name. When I tried to call one of them from C++ it called the other which caused a crash. Since you normally get an error when you try to overload UFunctions, I guess this is just an edge case that hasn’t been found/fixed yet.

I first declared a base class with a BlueprintNativeEvent in it

UCLASS()
class OVERLOADTEST_API ABaseClass : public AActor
{
	GENERATED_BODY()
public:
	UFUNCTION(BlueprintNativeEvent, Category = "Default")
	void Initialize();

	virtual void Initialize_Implementation();
};

Then I inherited from that class and declared a BlueprintCallable function of the same name as the BlueprintNativeEvent

UCLASS()
class OVERLOADTEST_API AInheritedClass : public ABaseClass
{
	GENERATED_BODY()
public:
	UFUNCTION(BlueprintCallable, Category = "Default")
	void Initialize(int32 num);
	
	virtual void Initialize_Implementation() override;
};

When I try to call Initialize() from C++, it instead tries to call Initialize(num) and crashes when it tries to copy the parameters (which are null for the function with no parameters).

Attached is a repro case for this bug.

2

I’m pretty sure UFunctions are looked up by name only and therefore cannot be overloaded at this time. UHT will error out you if you try to overload a function in the same class. It should probably be an error in sub-classes as well.

3

Hey,

UFunctions can’t be overloaded, and we do test for that - however this is a case of function hiding and it seems we don’t test for that (i.e. a change in signature to an existing function). I’ll file a ticket to get it fixed. Thanks for reporting it!

Steve