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Assets/RealisticCarControllerV3/Scripts/RCC_Singleton.cs

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+// Singleton pattern: http://wiki.unity3d.com/index.php/Singleton
+using UnityEngine;
+
+public class RCC_Singleton<T> : MonoBehaviour where T : MonoBehaviour {
+
+    private static T m_Instance;
+    private static readonly object m_Lock = new object();
+
+    public static T Instance {
+
+        get {
+
+            lock (m_Lock) {
+
+                if (m_Instance != null)
+                    return m_Instance;
+
+                // Search for existing instance.
+                m_Instance = (T)FindObjectOfType(typeof(T));
+                // Create new instance if one doesn't already exist.
+                if (m_Instance != null) return m_Instance;
+                // Need to create a new GameObject to attach the singleton to.
+                var singletonObject = new GameObject();
+                m_Instance = singletonObject.AddComponent<T>();
+                singletonObject.name = typeof(T).ToString();
+
+                // Make instance persistent.
+                //DontDestroyOnLoad(singletonObject);
+
+                return m_Instance;
+
+            }
+
+        }
+
+    }
+
+}