Creating a simple object in UE4 C++ code does not work

Development Programming & Scripting
1

Hey guys, I cant seem to make create a simple object in ue4 c++.
I have these two different classes:
RandomGenActor.h - > UClass of AActor
RandomGenActor.cpp

and another
CarClass.h → is just a blank class
CarClass.cpp

And what I want to do is to create an object of CarClass inside RandomGenActor, here’s what I want to do:
to declare

CarClass * CarC = new CarClass;

inside RoomGenActor

but I’m getting compilation errors, any idea what is the proper way to do this? Thanks!

2

While that’s the typical C++ way of creating a new object, you want to use UWorld::SpawnActor so that it registers your object in the engine properly.

Here’s a reference: Spawning Actors in Unreal Engine | Unreal Engine 5.1 Documentation

3

Does it really have to be an actor? Is there no other way?
I’ve come across this post but the method that I tried here doesnt work, I havent tried constructing the object like the second method mentioned here yet.

4

Make your class inheriting UObject and use the NewObject() method to create your derived UObject.

5

oh okay, I’ll try that.
Anyways, is it also okay if I just code all objects in different classes and just have them communicate in a blueprint if thats possible?

6

Yeah that’s possible, you can create blueprint_implementable functions in your class and expose all the member variables to blueprints, but it might be more work than it’s worth, depending on what you’re trying to accomplish.

7

I do this. I just declare it (my custom class) as an instance variable as part of my AActor derived class and I don’t have the compile issues. However it is problematic if the actor gets re-used or serialised from some reason.

8

Can you show me how you did it? Thanks!

9

I’m trying to implement a certain algorithm. What method would you recommend? Thank you