71 lines
2.0 KiB
C#
71 lines
2.0 KiB
C#
using UnityEngine;
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// ReSharper disable StaticMemberInGenericType
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// ReSharper disable InconsistentNaming
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namespace ARLocation.Utils
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{
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public class Singleton<T> : MonoBehaviour where T : MonoBehaviour
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{
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// Check to see if we're about to be destroyed.
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private static bool m_ShuttingDown;
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private static object m_Lock = new object();
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private static T m_Instance;
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/// <summary>
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/// Access singleton instance through this propriety.
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/// </summary>
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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 (m_ShuttingDown)
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{
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Debug.LogWarning("[Singleton] Instance '" + typeof(T) +
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"' already destroyed. Returning null.");
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return null;
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}
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lock (m_Lock)
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{
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if (m_Instance == null)
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{
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// Search for existing instance.
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m_Instance = (T)FindObjectOfType(typeof(T));
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// Create new instance if one doesn't already exist.
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if (m_Instance == null)
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{
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// Need to create a new GameObject to attach the singleton to.
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var singletonObject = new GameObject();
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m_Instance = singletonObject.AddComponent<T>();
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singletonObject.name = typeof(T) + " (Singleton)";
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// Make instance persistent.
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DontDestroyOnLoad(singletonObject);
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}
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}
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return m_Instance;
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}
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}
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}
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public virtual void Awake()
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{
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m_ShuttingDown = false;
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}
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private void OnApplicationQuit()
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{
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m_ShuttingDown = true;
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}
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private void OnDestroy()
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{
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m_ShuttingDown = true;
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}
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}
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}
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