在C ++中的类中可以有可变数量的变量吗？

Question

This is my first question here, and I'm not very skilled at programming yet, so my apologies if I do something wrong. That said, I searched both here and on Google before asking the question, so if a duplicate exists, it's because I didn't know how to find it.

My question is as per the title.

I'm attempting to program a little procedural star system generator to refresh my memory and help grow my programming skills. I want to create a class for the solar system to hold data on the star(s) and planet(s), each of which will also be a class. So to illustrate my question for clarification:

Is there a way to avoid having to declare, say, 10 different "planetClass" items in the class, and instead define one that scales as it's needed? If not, is there an alternative, or do I just flat-out have to define up to the maximum variables needed?

Answer 1

You can simply define a Planet class to store data for each planet, and then add a std::vector<Planet> data member into your "outer" class.

std::vector is a standard STL container class template, that can be dynamically (ie at run-time) resized. You can add new items (in your case: Planet instances) to it, using its push_back() or emplace_back() methods.