Unity Singleton base classes with networked variants

Singleton.cs

using Unity.Netcode;
using UnityEngine;


/// <summary>
/// Singleton base class for normal MonoBehaviours
/// </summary>
public class Singleton<T> : MonoBehaviour where T : Component
{
    public static T Instance { get; private set; }

    public virtual void Awake()
    {
        if (Instance == null)
        {
            Instance = this as T;
        }
        else
        {
            Destroy(gameObject);
        }
    }
}

/// <summary>
/// Singleton base class for when we need to make sure the object is not destroyed on scene change
/// </summary>
public class SingletonPersistent<T> : MonoBehaviour where T : Component
{
    public static T Instance { get; private set; }

    public virtual void Awake()
    {
        if (Instance == null)
        {
            Instance = this as T;
            DontDestroyOnLoad(this);
        }
        else
        {
            Destroy(gameObject);
        }
    }
}

/// <summary>
/// Singleton base class for when we need Network primitives
/// </summary>
public class SingletonNetwork<T> : NetworkBehaviour where T : Component
{
    public static T Instance { get; private set; }

    public virtual void Awake()
    {
        if (Instance == null)
        {
            Instance = this as T;
        }
        else
        {
            Destroy(gameObject);
        }
    }
}


/// <summary>
/// Singleton base class for when we need to make sure the object is not destroyed on scene change AND need Network primitives
/// </summary>
public class SingletonNetworkPersistent<T> : NetworkBehaviour where T : Component
{
    public static T Instance { get; private set; }

    public virtual void Awake()
    {
        if (Instance == null)
        {
            Instance = this as T;
            DontDestroyOnLoad(this);
        }
        else
        {
            Destroy(gameObject);
        }
    }
}