Void Struct

The Void struct is an empty serialized struct to use as a holder property for attributes like the VerticalGroup Attribute, HorizontalGroup Attribute, etc. that completely redraw the property in the inspector.

By itself the Void struct will not be drawn in the inspector but attributes attached to it will still execute.

If you are using the System namespace and EditorAttributes namespace in your script then use the Void struct you will notice a naming conflict between System.Void and EditorAttributes.Void, to fix that you will just have to specify which version you want to use, and there are 2 ways to do that.

Specify the namespace of the version you want to use on that line:

private System.Void systemVoidField;
// Or
private EditorAttributes.Void attributesVoidField;

Specify which version you want to use for the whole script under your other usings:
```
using Void = System.Void;
// Or
using Void = EditorAttributes.Void;
```

A common way this conflict can happen is when you use the editor attributes and serialize structs:

using System;
using UnityEngine;
using EditorAttributes;

public class AttributesExample : MonoBehaviour
{
        [Serializable]
        private struct ExampleStruct
        {
                public int data01;
                public int data02;
        }

        [SerializeField] private ExampleStruct exampleStruct;

        [HelpBox("This is a help box")]
        [SerializeField] private Void helpBoxHolder; // This line will throw an error
}

We can fix the error either by adding using Void = EditorAttributes.Void; between the usings and class declaration or by removing the using System; at the top of the file, then to use the Serializable Attribute we just call the namespace directly:

[System.Serializable]
private struct ExampleStruct
{
        public int data01;
        public int data02;
}

Now which version you want to use if up to personal preferece.