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using UnityEngine;
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public class SingletonMono<T> : MonoBehaviour where T : SingletonMono<T>
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{
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    public static T Instance { get; private set; }
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    // 子类可重写：是否跨场景保留（默认保留）
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    protected virtual bool IsDontDestroy => true;
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    protected virtual void Awake()
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    {
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        // 已有实例且不是自己 → 销毁多余的
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        if (Instance != null && Instance != this)
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        {
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            Destroy(gameObject);
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            return;
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        }
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        Instance = (T)this;
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        if (IsDontDestroy)
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            DontDestroyOnLoad(gameObject);
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    }
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    protected virtual void OnDestroy()
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    {
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        // 自己被销毁时清空引用，避免访问到已销毁的对象
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        if (Instance == this)
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            Instance = null;
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    }
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}

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public class Singleton<T> where T : class, new()
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{
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    private static T _instance;
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    public static T Instance
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    {
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        get
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        {
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            if (_instance == null)
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                _instance = new T();
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            return _instance;
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        }
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    }
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}