using UnityEngine;
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namespace Core.Utilities
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{
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/// <summary>
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/// Singleton class，这种类型的Singleton赴作用，必须得在Unity中找一个Entity--Add Compoment，不然不会调用Awake.
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/// </summary>
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/// <typeparam name="T">Type of the singleton</typeparam>
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public abstract class Singleton<T> : MonoBehaviour where T : Singleton<T>
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{
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/// <summary>
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/// The static reference to the instance
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/// </summary>
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public static T instance { get; protected set; }
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/// <summary>
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/// Gets whether an instance of this singleton exists
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/// </summary>
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public static bool instanceExists
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{
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get { return instance != null; }
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}
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/// <summary>
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/// Awake method to associate singleton with instance
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/// </summary>
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protected virtual void Awake()
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{
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if (instanceExists)
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{
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Destroy(gameObject);
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}
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else
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{
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instance = (T) this;
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}
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}
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/// <summary>
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/// OnDestroy method to clear singleton association
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/// </summary>
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protected virtual void OnDestroy()
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{
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if (instance == this)
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{
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instance = null;
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}
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}
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}
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}
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