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How can static polymorphic objects be stored in a vector? [message #1864514]

Wed, 20 March 2024 13:26

Eclipse User

Hello everyone!

I designed my program using of Curiously recurring template pattern. I have BaseComponent<T> class and about 100 classes that are deriving from it. I want to init objects of these classes in runtime and store these objects in a vector in a specific order. Then go through this vector and call the BaseComponent<T> interface for each of them. Since I can't have vector<BaseComponent*> I added Component class. So the hierarchy is following: Component -> BaseComponent<T> -> other classes. It allows me to keep objects in specific order with vector<Component*>. But then these objects can't be cast to BaseComponent and don't have interface I required. I can use plnkgame virtual function but it kills the whole idea of CRTP (and performance too). I did measurements and in my case, the use of virtual functions is super bad.

In brief: I want to have BaseComponent<T> in a specific order and use that interface without virtual functions. Does someone have advice on how can I achieve that?

[Updated on: Wed, 27 March 2024 09:34] by Moderator

Re: How can static polymorphic objects be stored in a vector? [message #1864610 is a reply to message #1864514]

Thu, 28 March 2024 03:40

Eclipse User

Hey there!

That's an interesting situation with the CRTP and specific order for derived components. Here are a couple of thoughts:

Consider Alternative Ordering: Could you achieve the desired order without the vector? Maybe a linked list or a custom container that manages order based on your component types?

Interface Inheritance with Static Methods: If order isn't crucial, explore defining the interface methods in the Component class as static functions. Derived classes can then implement them directly. This avoids virtual functions.

CRTP with Friend Classes: Maybe explore using friend classes within the template. This allows derived classes to access private members of BaseComponent<T>, potentially enabling interface calls without virtuals. (Note: This approach can have complexity drawbacks)

Remember, the best approach depends on your specific needs. It might be worth evaluating if a different ordering strategy or a slight interface redesign could avoid the virtual function overhead.

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