mirror of https://github.com/oliverbooth/X10D
45 lines
1.3 KiB
C#
45 lines
1.3 KiB
C#
using UnityEngine;
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namespace X10D.Unity;
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/// <summary>
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/// Represents a class which implements the singleton pattern for a specific <see cref="MonoBehaviour" />. This class is not
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/// thread-safe.
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/// </summary>
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/// <typeparam name="T">The type of the singleton.</typeparam>
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[Obsolete("This implementation of the singleton pattern is discouraged, and this class will be removed in future. " +
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"DO NOT USE THIS TYPE IN PRODUCTION.")]
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public abstract class Singleton<T> : MonoBehaviour
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where T : Singleton<T>
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{
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private static Lazy<T> s_instanceLazy = new(CreateLazyInstanceInternal, false);
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/// <summary>
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/// Gets the instance of the singleton.
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/// </summary>
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/// <value>The singleton instance.</value>
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public static T Instance
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{
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get => s_instanceLazy.Value;
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}
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/// <summary>
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/// Called when the object is destroyed.
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/// </summary>
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protected virtual void OnDestroy()
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{
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s_instanceLazy = new Lazy<T>(CreateLazyInstanceInternal, false);
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}
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private static T CreateLazyInstanceInternal()
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{
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if (FindObjectOfType<T>() is { } instance)
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{
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return instance;
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}
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var gameObject = new GameObject {name = typeof(T).Name};
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return gameObject.AddComponent<T>();
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}
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}
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