firebolt | Golang framework for streaming ETL

I've researched a lot but I can't seem to find anything that will actually work, or if its possible. What I need is an object factory or a registry I believe, I don't know how and no threads are really helping. They usually use ideas I'm not familiar with at all so it can be hard to follow.

In my example, I have a parent class called Art and a bunch of child classes of the types of Art (e.g. FireBolt). I want a user to be able to freely add a FireBolt object to their list of Arts without having to ever include the FireBolt object anywhere. So going through only the Art object, I need a way to create a new child class of Art and return it. The idea is that it will be like a console/god mode type deal where the user will be able to add anything they like at any given time. I know games like Skyrim have this ID system, I don't exactly know how to do it though.

I have tried to simply map a string to an Art* object (std::map artMap), and use a function called regArt(std::string ID, Art* art), but whenever I try to use this it returns the error "error: expected constructor, destructor, or type conversion before '(' token". Additionally, I believe this will mean that everyone shares a single version of the Art, and in the game specification, Art's can change mid game.

Please note, I have been linked to other threads that try to solve the same problem but I can't get them to work in my example. A lot of comments to the answer that simply say 'This does not work'.

Some probably useless code;

Art.h;

I am getting the following error after migrating to Angular material 5.2.2. Prior to that my application was in Angular material 2.0.0-beta.10.

After changing the version in the package.json and running the npm install, I also followed the steps mentioned in the post https://stackoverflow.com/a/47726311/6167659

I notice that all the Md* tags are changed to Mat*, but now I am facing the error as

So the issue I'm having is that I'm declaring an array ability1 inside of a while loop, then trying to access that same array inside an if statement that is outside the loop. I can't figure out how to make that accessible as a global function. (BTW I'm new to Java so I don't know all the fancy stuff you can do). Thanks!