Networked Singleton - Unity Netcode

Singleton.cs

using Unity.Netcode;
using UnityEngine;

/*
	Generic classes for the use of singleton
	there are 3 types:
	- MonoBehaviour -> for the use of singleton to normal MonoBehaviours
	- NetworkBehaviour -> for the use of singleton that uses the NetworkBehaviours
	- Persistent -> when we need to make sure the object is not destroyed during the session
*/

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);
        }
    }
}

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);
        }
    }
}

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);
        }
    }
}

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);
        }
    }
}