Pointer to const data parameter in a BlueprintImplementableEvent

Development Programming & Scripting C++
1

Hello,

I’m having some trouble trying to pass a pointer to const data in a BlueprintImplementableEvent, when I compile it and implement it in a blueprint it doesn’t prevent from modifying the const pointed object.


UFUNCTION(BlueprintImplementableEvent, meta = (BlueprintProtected = "true", DisplayName = "Function Initializer"))
    void FunctionInitializer(const UVectorFieldEditable* VectorField);

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When I implement it in a blueprint instance is possible to call setter for the object variables without any error.

How can I declare this function in c++ to make the VectorField parameter readonly in blueprints?

Thanks

2

You can’t, bp doesn’t support const uobject pointers. You’d have to either hint the user to not modify it or make some kind of wrapper.

3

Surprised it even compiles to be honest. Epic like const-correctness about as much as they like namespaces.
If you’re super bothered about it, then as Zeblote says you’d need to wrap it - probably by creating a UInterface that only exposes non-modifying methods. It’s going to bloat your code horribly if you start doing that everywhere though.

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