add project files

Assets/Scripts/Toolkit/OHM/UnityToolkit/UniqueInstance_T.cs

@@ -0,0 +1,36 @@
+using System;
+using UnityEngine;
+
+namespace OHM.UnityToolkit
+{
+	public class UniqueInstance<T> : MonoBehaviour
+	{
+		private static UniqueInstance<T> _instance;
+
+		public static T Instance
+		{
+			get
+			{
+				return (_instance is T typed) ? typed : default(T);
+			}
+		}
+
+		public void Awake()
+		{
+			if (_instance != null)
+			{
+				Debug.LogWarning("There is more than one _instance of type " + typeof(T));
+			}
+			else
+			{
+				_instance = this;
+			}
+			AwakeInstance();
+		}
+
+		protected virtual void AwakeInstance()
+		{
+		}
+
+	}
+}