Does C# just copy field data on assigning to another field or refers to the data?
c#, data-members
Solution
Because your data type `World` is defined as a `class` and not a `struct` that means that when you assign a variable of that type, only a reference to the same data is copied.
In other wrods, whether you then use `world.SomeProperty = something` or `world_.someProperty = something` they will be editing the same object in memory.
If you change your data type to be a `struct` then the entire data structure will be copied and you will have two copies of the same data.
Regardless of how you defined your data, once you have a reference to the data you can then access its methods or properties. So, yes, once your Entity object has a reference to the world object it can access any methods or properties on it (as long as they are not private).
Problem
At assigning one field to another, does the C# just copy data over, or actually creates link? In this article there's an example of game engine structure. The coder there has components contain their parent. In C#, do they just contain the parent copy, or they refer to it? Example code: ``` class World { ... public void Update() { ... ent.OnAttach(this); ... } ... } class Entity { ... public void OnAttach(World world) { world_ = world; } ... } ``` Could the Entity object now access World object and have access to it's fields and methods, like in the artice? (or I misunderstood the code?)