Merge from dev-FireflyShell branch

win32/FireflyShell/singleton.h

@@ -0,0 +1,49 @@
+/*
+ *(C) 2006 Roku LLC
+ *
+ * This program is free software; you can redistribute it and/or modify it 
+ * under the terms of the GNU General Public License Version 2 as published 
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but 
+ * without any warranty; without even the implied warranty of 
+ * merchantability or fitness for a particular purpose. See the GNU General 
+ * Public License for more details.
+ *
+ * Please read README.txt in the same directory as this source file for 
+ * further license information.
+ */
+
+#ifndef SINGLETON_H
+#define SINGLETON_H
+
+template <class T>
+class Singleton
+{
+	static T *sm_instance;
+
+public:
+	Singleton()
+	{
+		T *instance = static_cast<T *>(this);
+		ATLASSERT(sm_instance == NULL);
+		sm_instance = instance;
+	}
+
+	virtual ~Singleton()
+	{
+		ATLASSERT(sm_instance != NULL);
+		sm_instance = NULL;
+	}
+
+	static T *GetInstance()
+	{
+		ATLASSERT(sm_instance != NULL);
+		return sm_instance;
+	}
+};
+
+template <class T>
+T *Singleton<T>::sm_instance;
+
+#endif // SINGLETON_H